Who needs a MM cartridge type when we have MC?


Dear friends: who really needs an MM type phono cartridge?, well I will try to share/explain with you what are my experiences about and I hope too that many of you could enrich the topic/subject with your own experiences.

For some years ( in this forum ) and time to time I posted that the MM type cartridge quality sound is better than we know or that we think and like four months ago I start a thread about: http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1173550723&openusid&zzRauliruegas&4&5#Rauliruegas where we analyse some MM type cartridges.

Well, in the last 10-12 months I buy something like 30+ different MM type phono cartridges ( you can read in my virtual system which ones. ) and I’m still doing it. The purpose of this fact ( “ buy it “ ) is for one way to confirm or not if really those MM type cartridges are good for us ( music lovers ) and at the same time learn about MM vs MC cartridges, as a fact I learn many things other than MM/MC cartridge subject.

If we take a look to the Agon analog members at least 90% of them use ( only ) MC phono cartridges, if we take a look to the “ professional reviewers “ ( TAS, Stereophile, Positive Feedback, Enjoy the Music, etc, etc, ) 95% ( at least ) of them use only MC cartridges ( well I know that for example: REG and NG of TAS and RJR of Stereophile use only MM type cartridges!!!!!!!! ) , if we take a look to the phono cartridge manufacturers more than 90% of them build/design for MC cartridges and if you speak with audio dealers almost all will tell you that the MC cartridges is the way to go.

So, who are wrong/right, the few ( like me ) that speak that the MM type is a very good alternative or the “ whole “ cartridge industry that think and support the MC cartridge only valid alternative?

IMHO I think that both groups are not totally wrong/right and that the subject is not who is wrong/right but that the subject is : KNOW-HOW or NON KNOW-HOW about.

Many years ago when I was introduced to the “ high end “ the cartridges were almost MM type ones: Shure, Stanton, Pickering, Empire, etc, etc. In those time I remember that one dealer told me that if I really want to be nearest to the music I have to buy the Empire 4000 D ( they say for 4-channel reproduction as well. ) and this was truly my first encounter with a “ high end cartridge “, I buy the 4000D I for 70.00 dls ( I can’t pay 150.00 for the D III. ), btw the specs of these Empire cartridges were impressive even today, look: frequency response: 5-50,000Hz, channel separation: 35db, tracking force range: 0.25grs to 1.25grs!!!!!!!!, just impressive, but there are some cartridges which frequency response goes to 100,000Hz!!!!!!!!!!

I start to learn about and I follow to buying other MM type cartridges ( in those times I never imagine nothing about MC cartridges: I don’t imagine of its existence!!!. ) like AKG, Micro Acoustics, ADC, B&O, Audio Technica, Sonus, etc, etc.

Years latter the same dealer told me about the MC marvelous cartridges and he introduce me to the Denon-103 following with the 103-D and the Fulton High performance, so I start to buy and hear MC cartridges. I start to read audio magazines about either cartridge type: MM and Mc ones.

I have to make changes in my audio system ( because of the low output of the MC cartridges and because I was learning how to improve the performance of my audio system ) and I follow what the reviewers/audio dealers “ speak “ about, I was un-experienced !!!!!!!, I was learning ( well I’m yet. ).

I can tell you many good/bad histories about but I don’t want that the thread was/is boring for you, so please let me tell you what I learn and where I’m standing today about:

over the years I invested thousands of dollars on several top “ high end “ MC cartridges, from the Sumiko Celebration passing for Lyras, Koetsu, Van denHul, to Allaerts ones ( just name it and I can tell that I own or owned. ), what I already invest on MC cartridges represent almost 70-80% price of my audio system.

Suddenly I stop buying MC cartridges and decide to start again with some of the MM type cartridges that I already own and what I heard motivate me to start the search for more of those “ hidden jewels “ that are ( here and now ) the MM phono cartridges and learn why are so good and how to obtain its best quality sound reproduction ( as a fact I learn many things other than MM cartridge about. ).

I don’t start this “ finding “ like a contest between MC and MM type cartridges.
The MC cartridges are as good as we already know and this is not the subject here, the subject is about MM type quality performance and how achieve the best with those cartridges.

First than all I try to identify and understand the most important characteristics ( and what they “ means “. ) of the MM type cartridges ( something that in part I already have it because our phonolinepreamp design needs. ) and its differences with the MC ones.

Well, first than all is that are high output cartridges, very high compliance ones ( 50cu is not rare. ), low or very low tracking force ones, likes 47kOhms and up, susceptible to some capacitance changes, user stylus replacement, sometimes we can use a different replacement stylus making an improvement with out the necessity to buy the next top model in the cartridge line , low and very low weight cartridges, almost all of them are build of plastic material with aluminum cantilever and with eliptical or “ old “ line contact stylus ( shibata ) ( here we don’t find: Jade/Coral/Titanium/etc, bodies or sophisticated build material cantilevers and sophisticated stylus shape. ), very very… what I say? Extremely low prices from 40.00 to 300.00 dls!!!!!!!!!!!!!!!!!!, well one of my cartridges I buy it for 8.99 dls ( one month ago ): WOW!!!!!!, so any one of you can/could have/buy ten to twenty MM cartridges for the price of one of the MC cartridge you own today and the good notice is that is a chance that those 10-20 MM type cartridges even the quality performance of your MC cartridge or beat it.

Other characteristics is that the builders show how proud they were/are on its MM type cartridges design, almost all those cartridges comes with a first rate box, comes with charts/diagrams of its frequency response and cartridge channel separation ( where they tell us which test recording use it, with which VTF, at which temperature, etc, etc. ), comes with a very wide explanation of the why’s and how’s of its design and the usual explanation to mount the cartridge along with a very wide list of specifications ( that were the envy of any of today MC ones where sometimes we really don’t know nothing about. ), comes with a set of screws/nuts, comes with a stylus brush and even with stylus cleaning fluid!!!!!!!!!, my GOD. Well, there are cartridges like the Supex SM 100MK2 that comes with two different stylus!!!! One with spherical and one with elliptical/shibata shape and dear friends all those in the same low low price!!!!!!!!!!!

Almost all the cartridges I own you can find it through Ebay and Agon and through cartridge dealers and don’t worry if you loose/broke the stylus cartridge or you find the cartridge but with out stylus, you always can/could find the stylus replacement, no problem about there are some stylus and cartridge sources.

When I’m talking about MM type cartridges I’m refer to different types: moving magnet, moving iron, moving flux, electret, variable reluctance, induced magnet, etc, etc. ( here is not the place to explain the differences on all those MM type cartridges. Maybe on other future thread. ).

I made all my very long ( time consuming ) cartridge tests using four different TT’s: Acoustic Signature Analog One MK2, Micro Seiki RX-5000, Luxman PD 310 and Technics SP-10 MK2, I use only removable headshell S and J shape tonearms with 15mm on overhang, I use different material build/ shape design /weight headshells. I test each cartridge in at least three different tonearms and some times in 3-4 different headshells till I find the “ right “ match where the cartridge perform the best, no I’m not saying that I already finish or that I already find the “ perfect “ match: cartridge/headshell/tonearm but I think I’m near that ideal target.

Through my testing experience I learn/ confirm that trying to find the right tonearm/headshell for any cartridge is well worth the effort and more important that be changing the TT. When I switch from a TT to another different one the changes on the quality cartridge performance were/are minimal in comparison to a change in the tonearm/headshell, this fact was consistent with any of those cartridges including MC ones.

So after the Phonolinepreamplifier IMHO the tonearm/headshell match for any cartridge is the more important subject, it is so important and complex that in the same tonearm ( with the same headshell wires ) but with different headshell ( even when the headshell weight were the same ) shape or build material headshell the quality cartridge performance can/could be way different.

All those experiences told me that chances are that the cartridge that you own ( MC or MM ) is not performing at its best because chances are that the tonearm you own is not the best match for that cartridge!!!!!!, so imagine what do you can/could hear when your cartridge is or will be on the right tonearm???!!!!!!!!, IMHO there are ( till today ) no single ( any type at any price ) perfect universal tonearm. IMHO there is no “ the best tonearm “, what exist or could exist is a “ best tonearm match for “ that “ cartridge “, but that’s all. Of course that are “ lucky “ tonearms that are very good match for more than one cartridge but don’t for every single cartridge.

I posted several times that I’m not a tonearm collector, that I own all those tonearms to have alternatives for my cartridges and with removable headshells my 15 tonearms are really like 100+ tonearms : a very wide options/alternatives for almost any cartridge!!!!!!

You can find several of these MM type cartridges new brand or NOS like: Ortofon, Nagaoka, Audio Technica, Astatic, B&O, Rega, Empire, Sonus Reson,Goldring,Clearaudio, Grado, Shelter, Garrot, etc. and all of them second hand in very good operational condition. As a fact I buy two and even three cartridges of the same model in some of the cartridges ( so right now I have some samples that I think I don’t use any more. ) to prevent that one of them arrive in non operational condition but I’m glad to say that all them arrive in very fine conditions. I buy one or two of the cartridges with no stylus or with the stylus out of work but I don’t have any trouble because I could find the stylus replacement on different sources and in some case the original new replacement.

All these buy/find cartridges was very time consuming and we have to have a lot of patience and a little lucky to obtain what we are looking for but I can asure you that is worth of it.

Ok, I think it is time to share my performance cartridge findings:

first we have to have a Phonolinepreamplifier with a very good MM phono stage ( at least at the same level that the MC stage. ). I’m lucky because my Phonolinepreamplifier has two independent phono stages, one for the MM and one for MC: both were designed for the specifics needs of each cartridge type, MM or MC that have different needs.

we need a decent TT and decent tonearm.

we have to load the MM cartridges not at 47K but at 100K ( at least 75K not less. ).

I find that using 47K ( a standard manufacture recommendation ) prevent to obtain the best quality performance, 100K make the difference. I try this with all those MM type cartridges and in all of them I achieve the best performance with 100K load impedance.

I find too that using the manufacturer capacitance advise not always is for the better, till “ the end of the day “ I find that between 100-150pf ( total capacitance including cable capacitance. ) all the cartridges performs at its best.

I start to change the load impedance on MM cartridges like a synonymous that what many of us made with MC cartridges where we try with different load impedance values, latter I read on the Empire 4000 DIII that the precise load impedance must be 100kOhms and in a white paper of some Grace F9 tests the used impedance value was 100kOhms, the same that I read on other operational MM cartridge manual and my ears tell/told me that 100kOhms is “ the value “.

Before I go on I want to remember you that several of those MM type cartridges ( almost all ) were build more than 30+ years ago!!!!!!!! and today performs at the same top quality level than today MC/MM top quality cartridges!!!!!, any brand at any price and in some ways beat it.

I use 4-5 recordings that I know very well and that give me the right answers to know that any cartridge is performing at its best or near it. Many times what I heard through those recordings were fine: everything were on target however the music don’t come “ alive “ don’t “ tell me “ nothing, I was not feeling the emotion that the music can communicate. In those cartridge cases I have to try it in other tonearm and/or with a different headshell till the “ feelings comes “ and only when this was achieved I then was satisfied.

All the tests were made with a volume level ( SPL ) where the recording “ shines “ and comes alive like in a live event. Sometimes changing the volume level by 1-1.5 db fixed everything.

Of course that the people that in a regular manner attend to hear/heard live music it will be more easy to know when something is right or wrong.

Well, Raul go on!!: one characteristic on the MM cartridges set-up was that almost all them likes to ride with a positive ( little/small ) VTA only the Grace Ruby and F9E and Sonus Gold Blue likes a negative VTA , on the other hand with the Nagaoka MP 50 Super and the Ortofon’s I use a flat VTA.

Regarding the VTF I use the manufacturer advise and sometimes 0.1+grs.
Of course that I made fine tuning through moderate changes in the Azymuth and for anti-skate I use between half/third VTF value.

I use different material build headshells: aluminum, composite aluminum, magnesium, composite magnesium, ceramic, wood and non magnetic stainless steel, these cartridges comes from Audio Technica, Denon, SAEC, Technics, Fidelity Research, Belldream, Grace, Nagaoka, Koetsu, Dynavector and Audiocraft.
All of them but the wood made ( the wood does not likes to any cartridge. ) very good job . It is here where a cartridge could seems good or very good depending of the headshell where is mounted and the tonearm.
Example, I have hard time with some of those cartridge like the Audio Technica AT 20SS where its performance was on the bright sound that sometimes was harsh till I find that the ceramic headshell was/is the right match now this cartridge perform beautiful, something similar happen with the Nagaoka ( Jeweltone in Japan ), Shelter , Grace, Garrot , AKG and B&O but when were mounted in the right headshell/tonearm all them performs great.

Other things that you have to know: I use two different cooper headshell wires, both very neutral and with similar “ sound “ and I use three different phono cables, all three very neutral too with some differences on the sound performance but nothing that “ makes the difference “ on the quality sound of any of my cartridges, either MM or MC, btw I know extremely well those phono cables: Analysis Plus, Harmonic Technologies and Kimber Kable ( all three the silver models. ), finally and don’t less important is that those phono cables were wired in balanced way to take advantage of my Phonolinepreamp fully balanced design.

What do you note the first time you put your MM cartridge on the record?, well a total absence of noise/hum or the like that you have through your MC cartridges ( and that is not a cartridge problem but a Phonolinepreamp problem due to the low output of the MC cartridges. ), a dead silent black ( beautiful ) soundstage where appear the MUSIC performance, this experience alone is worth it.

The second and maybe the most important MM cartridge characteristic is that you hear/heard the MUSIC flow/run extremely “ easy “ with no distracting sound distortions/artifacts ( I can’t explain exactly this very important subject but it is wonderful ) even you can hear/heard “ sounds/notes “ that you never before heard it and you even don’t know exist on the recording: what a experience!!!!!!!!!!!

IMHO I think that the MUSIC run so easily through a MM cartridge due ( between other facts ) to its very high compliance characteristic on almost any MM cartridge.

This very high compliance permit ( between other things like be less sensitive to out-center hole records. ) to these cartridges stay always in contact with the groove and never loose that groove contact not even on the grooves that were recorded at very high velocity, something that a low/medium cartridge compliance can’t achieve, due to this low/medium compliance characteristic the MC cartridges loose ( time to time and depending of the recorded velocity ) groove contact ( minute extremely minute loose contact, but exist. ) and the quality sound performance suffer about and we can hear it, the same pass with the MC cartridges when are playing the inner grooves on a record instead the very high compliance MM cartridges because has better tracking drive perform better than the MC ones at inner record grooves and here too we can hear it.

Btw, some Agoners ask very worried ( on more than one Agon thread ) that its cartridge can’t track ( clean ) the cannons on the 1812 Telarc recording and usually the answers that different people posted were something like this: “””” don’t worry about other than that Telarc recording no other commercial recording comes recorded at that so high velocity, if you don’t have trouble with other of your LP’s then stay calm. “””””

Well, this standard answer have some “ sense “ but the people ( like me ) that already has/have the experience to hear/heard a MM or MC ( like the Ortofon MC 2000 or the Denon DS1, high compliance Mc cartridges. ) cartridge that pass easily the 1812 Telarc test can tell us that those cartridges make a huge difference in the quality sound reproduction of any “ normal “ recording, so it is more important that what we think to have a better cartridge tracking groove drive!!!!

There are many facts around the MM cartridge subject but till we try it in the right set-up it will be ( for some people ) difficult to understand “ those beauties “. Something that I admire on the MM cartridges is how ( almost all of them ) they handle the frequency extremes: the low bass with the right pitch/heft/tight/vivid with no colorations of the kind “ organic !!” that many non know-how people speak about, the highs neutral/open/transparent/airy believable like the live music, these frequency extremes handle make that the MUSIC flow in our minds to wake up our feelings/emotions that at “ the end of the day “ is all what a music lover is looking for.
These not means that these cartridges don’t shine on the midrange because they do too and they have very good soundstage but here is more system/room dependent.

Well we have a very good alternative on the ( very low price ) MM type cartridges to achieve that music target and I’m not saying that you change your MC cartridge for a MM one: NO, what I’m trying to tell you is that it is worth to have ( as many you can buy/find ) the MM type cartridges along your MC ones

I want to tell you that I can live happy with any of those MM cartridges and I’m not saying with this that all of them perform at the same quality level NO!! what I’m saying is that all of them are very good performers, all of them approach you nearest to the music.

If you ask me which one is the best I can tell you that this will be a very hard “ call “ an almost impossible to decide, I think that I can make a difference between the very good ones and the stellar ones where IMHO the next cartridges belongs to this group:

Audio Technica ATML 170 and 180 OCC, Grado The Amber Tribute, Grace Ruby, Garrot P77, Nagaoka MP-50 Super, B&O MMC2 and MMC20CL, AKG P8ES SuperNova, Reson Reca ,Astatic MF-100 and Stanton LZS 981.

There are other ones that are really near this group: ADC Astrion, Supex MF-100 MK2, Micro Acoustics MA630/830, Empire 750 LTD and 600LAC, Sonus Dimension 5, Astatic MF-200 and 300 and the Acutex 320III.

The other ones are very good too but less refined ones.
I try too ( owned or borrowed for a friend ) the Shure IV and VMR, Music maker 2-3 and Clearaudio Virtuoso/Maestro, from these I could recommended only the Clearaudios the Shure’s and Music Maker are almost mediocre ones performers.
I forgot I try to the B&O Soundsmith versions, well this cartridges are good but are different from the original B&O ( that I prefer. ) due that the Sounsmith ones use ruby cantilevers instead the original B&O sapphire ones that for what I tested sounds more natural and less hi-fi like the ruby ones.

What I learn other that the importance on the quality sound reproduction through MM type cartridges?, well that unfortunately the advance in the design looking for a better quality cartridge performers advance almost nothing either on MM and MC cartridges.

Yes, today we have different/advanced body cartridge materials, different cantilever build materials, different stylus shape/profile, different, different,,,,different, but the quality sound reproduction is almost the same with cartridges build 30+ years ago and this is a fact. The same occur with TT’s and tonearms. Is sad to speak in this way but it is what we have today. Please, I’m not saying that some cartridges designs don’t grow up because they did it, example: Koetsu they today Koetsu’s are better performers that the old ones but against other cartridges the Koetsu ones don’t advance and many old and today cartridges MM/MC beat them easily.

Where I think the audio industry grow-up for the better are in electronic audio items ( like the Phonolinepreamps ), speakers and room treatment, but this is only my HO.

I know that there are many things that I forgot and many other things that we have to think about but what you can read here is IMHO a good point to start.

Regards and enjoy the music.
Raul.
rauliruegas
Dear Fleib, I did not know that Mr. Lurne' founded a school. I do know that I heard one of his early turntable efforts that had a spring suspension, and I thought it was a very bad sounding, over-priced product. Possibly his later efforts have been better; it would have been easy to improve the one I heard by tossing out the springs. The thing was visibly bouncing whilst trying to play music. (The suspension seemed completely undamped.) But this is all OT. Yes, the platter (and platter mat) is a very important and often neglected determinant of turntable sound, IMO. There are as many opinions on how to make the perfect platter (and platter mat) as there are audiophiles. The negative opinions that some have regarding the vintage Japanese dd turntables may have as much to do with their typical heavy, dull-sounding rubber mats as anything else. First thing to do with a Technics or a Denon is ditch the mat (but keep it hidden away, for originality). And yes, the shield is something that you don't miss until you install one and hear the difference. I would not run my L07D without it. However, I think the shield is likely to be specific for dd turntables and maybe only for Kenwoods at that. Some guys were going to try it with Technics tables, but I never read a report on the results. (The better Kenwoods have a coil-less motor that is mounted right up high just under the platter, so my completely unproven theory is that the motor may radiate EMI upward and affect the cartridge.)
Dear friends: Good opportunities :

http://cgi.ebay.com/Nagatron-9600-Cartridge-Mounted-Black-Headshell-Used-/320715163104?pt=LH_DefaultDomain_0&hash=item4aac1d05e0#ht_1144wt_934

http://cgi.ebay.com/Nagatron-9600-Cartridge-Mounted-Headshell-Used-/320715139632?pt=LH_DefaultDomain_0&hash=item4aac1caa30#ht_1144wt_934

http://cgi.ebay.com/Rare-Vintage-EMPIRE-EDR9-Stereo-Turntable-Cartridge-/280696091204?pt=LH_DefaultDomain_0&hash=item415aca7244#ht_500wt_950

Regards and enjoy the music,
Raul.
Dear Dertonarm, I need to make some 'a posteriori' comment
on your Goethe quote. As a lawyer I know that nobody, except some specific lawyer, read Criminal law. There are two reasons why: 1. the language used is very boring because of the repetition of the same kind of hypothetical statements.
a. If you commit 'a' you get 4 years;
b. If you commit 'b' you get 10 years'
c. If you commit 'c' (of the capital crime)you get death
penalty ( in some countrys) , etc. etc,.

2. The second reason is simple because people don't like to
know in advance but prefer to quess. If they are allowed
to quess they will always quess in their own interest.
So no wonder that every defence start with: "I had no idea that 'a' was not allowed'' or ''I had no idea what 'a' exactly means'',etc.
This defence is based on the strange assumption that 'ignorance' is somehow identical with 'innocence'.

Now back to Goethe:

'it is allowed what you fancy, what is accomodating'

This is my transaltion. Well it may be the case that such
longing is allowed by Goethe but there are many articles in the Criminal Law which don't allow us to do what we would like to do.

Regards,

Dear Lewm, Your comments say more about the design flaws of the LO-7D than about Lurne. I must plead ignorance concerning your Kenwood, just as you are ignorant concerning Audio Mecca, Goldmund direct drive and Lurne.
Regards,
Hi Folks

Halcro in your postings about the AT7V and the ATN155LC you asked about the reason for the differences between styli and the concomittant need for loading adjustments....

I've been thinking of writing a lot of this down.... an article for somewhere perhaps.

But taking a shot at it here and on the fly!

First the needles ability to follow the groove varies by shape and particularly by side radius... this will change the distortion levels (and some of that distortion may contribute to "enhancements" at certain frequencies)... but will not for the most part affect the fundamental "sound" of the stylus (in other words it affects fine details but not overall tone).

The cantilever is very much more critical:
1) it is the prime contributor to effective mass - and the lower the total effective mass, the better both tracking and high frequency becomes - this is however another "detail" aspect.

2) Mechanical Resonance and Damping thereof - this is the core and hub of the matter - the tone/sound of a stylus is fundamentally driven by this!
The frequency response of the stylus will be altered by the resonance, and by the damping (and suspension - which is part of the damping) used.
The Ortofon Ortophase article has graphs showing 4 different cantilever setups on an Ortofon MC200 cartridge - minimula/no damping through to heavily damped.
This affects the amplitude frequency response as well as the phase frequency response substantially.
Many of the cartridges regarded as "the best" have their resonances placed well outside the audio range (EPC100 well over 50kHz, Shure V15V 33kHz to 35k Hz)

Placing the resonance that high ensures that the stylus and cantilever can respond in a (relatively) pure linear way within the audio band... and a close to linear way well above the audio band.

Coming back to earth, and considering some styli I have measured....

The AT440MLa has a nice stylus and cantilever, but the mechanical resonance is spread from about 13kHz to 17kHz - the wide spread and "double peak" pattern of that resonance appears to indicate quite heavy use of damping... (internal to cantilever? - different materials in the suspension? not sure...) - Keep in mind that damping also does terrible things to phase linearity.... and these are difficult to measure or pin down subjectively...

So the ATN440MLa stylus has a tone which is driven by the raised area across the high frequencies - and the fact that this raised area is spread across a relatively wide frequency range.

Moving to the ATN15/20SS - with the beryllium cantilever...
The mechanical resonance is just barely outside the audible area (21k to 23k) but the rise to that peak has an influence down to around 15kHz.
because the peak is outside the audio area, it doesn't need to be damped so heavily - so the peak it much higher than the ATN440MLa peak, but its influence at 20kHz is only a touch more than the height of the ATN440MLa's peak - and by the time you get down to 16kHz the influence is negligible, where the ATN440MLa is at it's maximum influence around that frequency area.

The ATN15/20ss therefore sounds much more inherently neutral as a result (its midrange is well outside the influence of the resonance - where the ATN440Mla resonance influence extends down to 8kHz or perhaps even 5kHz)

3) Loading:
given a rise at the extreme high end, on the ATN20ss stylus - Neutral results require a load that drops off in an inverse relationship to the rise, resulting in a relatively flat frequency response. - This drop off needs to start quite late - so low capacitance and inductance is important, and avoiding high R loads as these may raise the high end exacerbating the already raised fundamental cantilever performance.

By contrast the ATN440MLa needs to have a rolloff that starts earlier as its own peak starts earlier - so different capacitance - and a lower R loading to keep from adding a rise in those frequencies...

You can see that these two cantilevers will have very different "sounds" - their fundamental frequency response is very different - and therefore the right loading to provide a flat F/R is different - the loading must match the stylus - not the cartridge! (the cartridge is of course a factor)

Now the cartridge - in the past I have said the cartridge has the least impact - which I still hold to, but they are interesting beasts too...
Cartridge electrical frequency response is NOT linear
A cartridge is a coil/magnet system much like a transformer, and suffers from increasing inefficiency as frequency rises.
The quality of the materials and construction will affect the level of inefficiency - as will voltage levels & frequencies involved.

What I am observing is that when looking closely at cartridge frequency response, all cartridges have a response peak in the lower mid/high bass region (between 150Hz and 300Hz) and then response shows a consistent downwards slope thereafter.
The angle of that downwards slope is most likely related to the effectiveness/efficiency of the construction.
This means that all magnetic cartridges tend to have a slight bass "hump" (the "warmth" of vinyl) and then a midrange slump.
Many cartridges then use a combination of electrical and mechanical resonance to "fill out" that drop.
(there is also a much more dramatic drop when the LCR response shoulder is reached...)
The better the quality of construction/design, the lower the slope angle - and the less need there is to use resonances to fill things out. (and therefore top end cartridges tend to push the resonances further out... because they can!)
You can easily plot the Inductance, Capacitance, Resistance frequency response of a cartridge, and then you can experiment with differing values of C & R which will show how the response can be tailored- high end can be raised or lowered, a peak can be induced, and the shoulder after which performance drops rapidly can be shifted back or forwards in frequency.

When you change styli - the cantilever F/R is different, and to balance it out, you then need to adjust the capacitance and resistance, to change the cartridge curve to properly match the cantilever curve and provide a "flat" frequency response..... so it is definitely stylus driven - not cartridge.
Using a different model form the same manufacturer, or using a stylus from an after market manufacturer - regardless of its quality - will require a change to the loading.

Another example - a Shure M97xE will tend to sound best at 62k with its original stylus, but tends to sound best at 47k with the SAS N97xE stylus...

Other cartridge related thoughts:
A cartridge is a self biasing environment - applying a voltage to the cartridge changes its frequency response (marginally but still changes!).
There are some discussions on VE about the possibility of phono stages providing some biasing voltage...
But the important thing to consider is that the signal produced - the music itself - is in fact a bias current, affecting the frequency response.

Keeping in mind that I am not a physicist or Electrical engineer.... but I believe that this biasing influence is non linear with voltage - that is to say, at lower voltages and inductances the influence of the sound may be proportionally reduced.
The advantage of LO systems may in fact be the improved linearity due to reduced self biasing influence.
This may also be one of the reasons why many of the higher quality styli have a lower output (along with having lighter magnets to reduce effective mass...).
Lower inductances tend to push electrical resonances further up the frequency range (good!) - but may also be shifting to a range where self biasing is also reduced....

In any case - coming back to the point... yes - loading follows stylus...
Switching AT cartridge bodies allows experiments with differing inductances and the same styli... the overall "sound" follows the stylus.
Differences tend to be driven first by the stylus - then beyond that there are the differences driven by the various types of non-linearities and the effectiveness of the designs in coping with them - areas where some people may not even hear a difference.

bye for now

David