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How to pick a COMPATIBLE phono cartridge

As follow-up to my recent post titled "Da Benz", I'm trying to better educate myself on how to pick a phono cartridge. There are many to choose from but I don't know which "type(s)" (i.e., output, etc.) will work well with my setup. Not considering price or characteristics at this point, but simply compatibility . Once I know that I can research options to make a selection. Looking through some past forums I see this can get complicated, so I'll provide some info on my setup:

Conrad Johnson EF-1 Phono Stage
    Gain: 40, 46, 52 db
    Phono Overload: 70 mV (40 db gain setting)
    Hum and Noise: 88 db below 10mV input

Conrad Johnson Premier 16LS Pre Amp
    Gain: 25 db
    Maximum input: 15 vrms
    Output impedance: under 700 ohms
    Hum and noise: 96 db below 1.0 mV

Conrad Johnson Premier 12 mono block Amps
    140 watts per channel
    Input Sensitivity: 0.90 volts to full power
    Input Impedance: 100k ohms

SME IV Arm
    Cartridge weight range: 5 - 16 grams
    Weight: 700 grams

And my leading cartridge candidate is the Benz Micro Wood (available in low, medium, and high versions), specs as follows:
    Output voltage: 0.4 (Low) 0.8 (Medium) 2.5 (High)
    Internal ohms: 12 (Low) 24 (Medium) 90 (High)
    Loading Range: >100 (Low) >1000 (Medium) 47k (High) 
    Weight: 9 grams
    Compliance: 15 (Low) 14 (Medium) 14 (High)
    Tracking 1.6 - 1.9 grams

The high output has been suggested. 

However, what cartridge specs should I be looking at for compatibility sake with my equipment and why? I have no idea!!!!   

Thank you to anyone who's willing to take the time to read and respond to a posting like this! :-)

Randy


rbschauman
rbschauman OP
138 posts
 
Al,

Thank you for the response and taking this into a deeper dive. 

Interesting and educational to me is how you relate hiss/or hum to the specs. That's what I'm looking for at the moment; concrete means to evaluate specs and to stay away from subjectivity. First things first...finding compatible cartridges from which to consider by having the basis to do so. After knowing what works, the fun will begin in seeking out the one that has the sound qualities I'm looking for!

Thank you yogiboy for providing a link to the matrix to check the arm/cartridge mass compatibility as well. Certainly want to be in the green there as well!

Thanks all,
Randy   
rbschauman OP
138 posts
 
jperry,

Thank you for that previous posting where you mentioned medium output. It's that (and a bit more) that got this thread going. 

Why? When I contacted a local dealer to get the medium output Benz priced I was advised to go to the high output. That then got me to thinking, how does one objectively evaluate/calculate what's compatible? What should I be looking for in specs when I browse around? 

So, just wanting to educate myself on how to use cartridge and equipment specs to determine what will/will not work (well anyway) with my setup.

Thank you!
Randy

 
almarg's avatar
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almarg
9,670 posts
 
First things first...finding compatible cartridges from which to consider by having the basis to do so. After knowing what works, the fun will begin in seeking out the one that has the sound qualities I’m looking for!
Excellent approach!

As I’ve said in a number of past threads the main usefulness of specs and measurements, IMO, is in **ruling out** from consideration candidates for purchase that would not be optimal (or even suitable) for use with other components in the system. Or in some cases that would not be consistent with listener requirements or preferences, an example being the maximum volume and hence dynamic range capability that can be provided by an amp/speaker combination.

Which thereby reduces the randomness of the selection process, and minimizes the likelihood of expensive mistakes.

Best regards,
-- Al


jls001
17 posts
 
You can use the calculator on this page to see gain needed for a particular output. For example, for 0.8 mV output you need gain of 52 dB.

Details of how they arrive at this value is explained in the page.

However, gain matching is only one aspect. One also needs to match the compliance of the cartridge to the effective mass of arm. 14/15 cu would put the cartridges in mid compliance range. SME IV effective mass as per SME's web page is "10/11" gram which is mid mass, so ought to be a good match for the chosen cartridge.
tablejockey
3,956 posts
 
almarg-

10-4 regarding your point. A great spec to be aware of when pulling the trigger and possibly investing  a chunk of cash.
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