M20FL Super Compliance?

Dear Derekmur: You don't say if already has or heard something wrong running the 20FL on your set up ( that's why I ask you. ).

I would like to go a little more in deep of what my experiences were/are with several cartridges and tonearms on the resonance subject and if I finded or had problems about:

for years and when I have only 2-3 cartridges I always made everything on hand to meet the theoretical " safe " resonance frequency range with our aware if between that resonance range was better than out of it: I just followed the " rules " as part of my audio learning curve.

Through the years and due that I had more and more cartridges and tonearms too ( I can't remember when. ) things goes more complex to me trying to be in that precise resonance range in the cartridge/tonearm set up so I quit about and just mounted my cartridges testing it on different tonearms/headshells with out worry if each cartridge set up was on target with the resonance frequency range. My target was and is to hear top quality performance from any cartridge.
Well, IMHO I almost always achieve that target and I know that sometimes ( random because I don't check any more. ) the set up is on that resonance range and many times is way off it.

I run my 20FL and 20E where the resonance frequency are ( I check it with your link. ): 6.84 and 4.86 respectively and you know what? I have no single trouble and have great performances with both cartridges.

IMHO the resonance cartridge/tonearm frequency range is almost a " curiosity " but can't tell you how that cartridge/tonearm set up will perform. Of course there are " cases " in extreme set up conditions where the problem is on a extreme resonance frequency range but are not very usual today.

Btw, the compliance spec by the cartridge seller is right.

Lewm, don't worry about but you always can use lower weight headshells and see what happen, Denon and Audio technica made headshells on that weight range you ask but you have make a " fishing " work on the net to find out.

Regards and enjoy the music,
Raul.

Dear Derekmur: I find these statements in other forum that I think comes from you:

++++++++" I guess I don't mean footfalls. I'm trying to describe what a low resonant frequency sounds like. I guess I mean the arm cart combination is accentuating low frequencies that don't necessarily coincide with musical information. Also the lower frequency spectrum sounds muddy with these artifacts. Is this what you hear with this kind of a mismatch? " +++++

IMHO I think ( like I posted ) that in extreme conditions ( TT set up, LP heavy waves/off center, tonearm poor bearing or faulty bearings, cartridge suspension out of manufacturer design, etc, etc, speaker heavy feedback, , , . ) it could happen what you posted even a deep msitmatch could make that the cartridge skip/wobble over the recording.

Are you on some " extreme " conditions?

Regards and enjoy the music,
Raul.

So you have muddy bass performance, right?. Other that that " mistmatch " I think that you have to check that the TT and tonearm are perfect level, you have to give 20 hours that cartridge to settle down, after these 20 hours make a check on set up on overhang, VTF, load impedance, capacitance, cleaning the cartridge pin connectors, checking the tonearm wire connection with the cartridge pin connectors, make changes in cartridge/tonearm VTA/SRA set up, azymuth set up ( this cartridge is very sensitive to this parameter and with an unipivot tonearm this is a critical factor. ), antiskating, I don't know which kind of damping " mechanism " ( oil or whatever. ) has that tonearm but you have to play with too, try to find if exist a recording where the cartridge performs great to analize differences, etc, etc.

Regards and enjoy the music,
Raul.

Thanks Raul,

I'm having a hard time describing the sound I heard from the m20fl. It seemed to be picking up lower frequency unwanted resonances from things like a small warp in the record. It sounded odd to me so I tested it on the Hi Fi News record. When i got such a low resonant frequency it made me wonder if something was wrong with the cart.

I realize that the Hi Fi News record isn't accurate, but it seems to me that this cart would need to be much more compliant than 20mm/µN to get this reading.

My current cart is a Nagaoka MP-50 and it's resonant frequency is close to what the Vinyl Engine calculator predicts.

I guess my question with all of this is:

How can a cart with a 20mm/µN compliance spec give a 6hz resonant frequency in a 12.3g effective mass tone arm?

Stringreen, I have the stainless armtube. Mike @ VPI told me that the effective mass of this armwand is 12.3g (the aluminum armtube is 10.9g)

Thanks

Dear Derek, I think up above you wrote that the predicted result was 8 to 9 Hz, using the equation and the parameters you note above. So if ALL of your input data are off by a little bit (due to age of cartridge, the variability of dynamic compliance, etc, etc), the interaction of these errors in solving the equation could easily give you any number +/-50% of predicted value. Plus, we know that your test instrument (the HFN LP) is inaccurate. What is the mystery? Garbage in/garbage out.