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In Reply to: RE: Tube preamp sweet spot/amp compatibility? posted by Highdecibel on May 19, 2015 at 09:25:24
You've gotten some unusual responses here...
What you're hearing is likely the power amplifier performance deteriorating as you demand more from it. You would have to have a horribly designed preamp, or be asking for a ton of voltage from it to have a drastic sonic change like the one you describe, and those Quicksilver monoblocks probably don't need more than 0.5V or so of signal to get to full power.
My guess is that you're hearing crossover distortion in the monoblocks.
Follow Ups:
Or something amp related as I see it. Old weak tubes in an amp and/or where bias was not looked after may make the amp put out 1/4 of its full capability or less. I too don't understand why people aren't focusing on the amp. Also he has not mentioned his speakers even though I asked that of him as inefficient speakers or ones that drop in impedance with loading may run better on the four ohm tap even though they are an 8 ohm class speaker.
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I apologize for not giving enough information or a better definition of what I was experiencing. I will make sure to give better, clearer information in the future.
The Reference 3A mm de capo speakers I have are rated 8 ohms, but apparently they drop to 5.1 ohms at one point according the the graphs I found. I was running the 8 ohm taps, and I did switch to the 4 ohm taps, after suggestions to try it. Sound became fuller, less bright, and better mid to high frequency clarity, less shrilly. Definitely sounds better on the 4 ohm tap.
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