Do I Have the Wrong Cartridge?

Manitunc, if you were familiar with Lowrider's posts you would realize that when he says "all my LPs are top class," presumably referring to those he has used in assessing the new cartridge, he knows whereof he speaks.

Also, there are many digitally mastered classical LPs that provide excellent sound quality. Many (although certainly not all) of the 1980's Telarcs, for instance, some of which I recall Lowrider mentioning that he owns.

Regards,
-- Al

Al...The phono stage is a SS built-in to the Rogue Perseus Magnum (4 12AU7 RCA Blackplates). I think resistance is set to 47K ohm for MM. The only settings for capacitance are
150pF and 0 PF. MM has no PF setting.

Manitunc...good question. My Classical collection ranges from 1960 to 1980 Digital masters. The analogue mastered LPs do sound better, but still too lean and sibilant.

Lowrider, I see what you are referring to, on page 6 of the manual for the Perseus. It makes no sense to me, though, that they would provide a 0/150 pf selection for moving coils, and no capacitance selection for moving magnets. So I'm not sure that the info shown in the manual is correct.

It might be worth your while to open up the preamp, and change the capacitance setting to the opposite of what it is at now. And while you're at it, make sure that resistance is in fact set to 47K, and that gain is set to 45 db and not 65 db.

Hmmm. Come to think of it, the 45 db MM phono stage gain + 15 db line stage gain of that preamp is pretty high for use with that cartridge, which has a specified output under the standard test conditions of "6.8-7.2 mv." Is the harshness and thinness particularly or mainly evident on high volume peaks?

Best regards,
-- Al

Al, no it's not a volume issue, so I'm sure it's set to MM (45 dB), although I will open it up when I have time end of the week to try your suggestions.
Let me describe what sound I'm getting...you know when you have a poor CDP and it has glare on the violins, it's very fatiguing. I always judge a good CDP/DAC on how it can handle solo or mass strings. This cart (or my settings) cannot. Music doesn't sound strained; it just lacks the warmth of vinyl, especially on a known recording such as Karl Bohm with the Vienna, 1970s.

1. Do u think the fact that Rock sounds good on my system is due to the distortions and heavy bass frequencies of the genre vs. the pristine sound of a classical recording?

2. Isn't the capacitance for MM so low that it basically is zero?

I can't say what the answer to Q1 is, without being familiar with the sound of the particular recordings. Re Q2, if load capacitance differs considerably from what is optimal for a particular MM cartridge, in either direction (too high or too low), it will profoundly affect the upper treble, quite possibly the lower treble, and perhaps even the upper mid-range. It is very conceivable that a severe enough mismatch could cause massed strings and brass to sound harsh and thin.

Typical MM load capacitance recommendations tend to be in the area of 100 to 300 pf, or in a few cases as much as 500 pf or so.

Load capacitance will affect LOMC sonics to a MUCH smaller degree, and in indirect ways that involve how the phono stage responds to ultrasonic and RF frequencies. So as I said, despite what the manual seems to say it doesn't make sense that the preamp design would provide a 0/150 pf switch for LOMC's, but no selection for MM's.

The "0" position, btw, will not really be 0 pf. It will be some presumably fairly small number corresponding to the intrinsic input capacitance of the preamp, while the 150 pf position will be 150 pf greater than that. And the capacitance of the phono cable will add significantly to that total.

Repeating my earlier question, how long is the phono cable?

Best,
-- Al