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In Reply to: RE: Volume vs Gain posted by pictureguy on August 12, 2015 at 20:09:27
I don't know what type of potentiometer is used. You would have to open it up and take a look -- possibly make some measurements. I guess you will need to figure that out before you buy a stepped attenuator. My system sounds real good with the stock potentiometers so I probably won't take my amp apart anytime soon. However, if you modify yours, I'll be interested to know what you discover.
Thanks,
John Elison
Follow Ups:
I won't do much of anything without 2 things.
First: a Schematic would be nice
Second: Figure What resistor net would give -1.5 db per step for 6 stepsI just had an Idea! I'm going to look at and download some interior photos. Maybe, if the pics are of sufficient resolution I can SEE the pot and at least see what Type it is.
A quick look at BOTH the '23 and the '21 shows a single gang, 3 wire 'pot' on each channel.
It is wired into a sub board with what LOOKS to be a few additional resistors. I can't tell.The next issue, due to the sub-board below each pot would be one of SPACE for which accomodations may need to be made.
As it turns out, the GOLDPOINT 24 step 'mono' attenuator is less expensive than the 6 position switch would be after adding resistors. the Stepper comes with 0.5% resistors and at the top to middle of the range features 2db steps. Perfectly fine. The KNOBS are expensive, though at 15$ to 19$ EACH. It is a non-standard (1/4"= standard) shaft size, so watch out.
If there is enough space, this would be the obvious way to go. At about 200$ per amp!
Too much is never enough
Edits: 08/13/15 08/13/15
I sent a note to Richard S requesting a schematic or just that part which shows the input circuitry.
Next step would be to open the case top and take a few measurements. See IF what I propose will FIT.
After that? If all goes well, I've got to RATIONALIZE about 200$ per amp in 'upgrades'.
Too much is never enough
That's a lot of money for a modification that might not sound any different than the stock potentiometer. Before I spent that kind of money, I would set the pots to the volume level you require. Then remove them and measure with an ohmmeter. Buy some quality resistors and install a cheap voltage divider. Leave one of your amplifiers stock and compare the sound quality.
My gut says it isn't worth $400 to modify two amplifiers but it might be worth installing simple voltage dividers. In other words, you might hear a slight difference but you might not be able to tell if it's better or worse, or just different. Moreover, even if you determine it to sound better, it might not sound enough better to justify spending $400. Of course, if it sounds significantly better and you want to install the stepped attenuators, then you've spend only a few extra dollars on the simple voltage dividers.
Good luck,
John Elison
But…….But……But…..
It's ONLY money!
I might add, in all honesty, that the divider was the recommended 'fix' IF I could decide on a single setting. I was also told to expect 'some' improvement.
Too much is never enough
Edits: 08/14/15
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