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In Reply to: RE: This is an absolutely stunning sounding setup. posted by JBen on March 05, 2015 at 13:53:58
The ONLY change I even think about to the amps is to REPLACE the level control with a pair of fixed resistors totaling the 100kohms I'm told the pot is.
Since I run it 'full open' I only need a 100k resistor. But, I don't need all that gain and would not be sorry to have to turn it up a little more for the same level.
Maybe 80k:20K?
I have written to Richard and he tells me that there isn't room for my original idea which was a switchable resistor net.
He also said that (to paraphrase) the sonic consequences should be to the good.
Too much is never enough
Follow Ups:
Yes, if you need to reduce the input signal, try to use a pair of (quality) resistors as required, per pot position. It pays off if you need to attenuate.
Bear in mind, I did not replace the pots in the 1000A after all. In my case they are always wide open. In that position there is hardly a thing to gain by replacing; the pots are clear at "0". Soldering a simple temporary jumper told the story.]
I just realized that ANY proposed passive LL XO will have a built in drop of maybe 6db or so.
That's all it'll take.
Now, if I could figure out the calculation for my 33k INPUT impedance, I'd go up to RS and start by getting a couple circuit boards and out to fry's where they have the HAKKO 888 solder station for 70$. A real deal.
Too much is never enough
Pix, I am sooo glad your are closer to trying this! I'll see if I have some useful numbers for you. We are talking 1.6QR, right? You may also want to check Neolith's spreadsheet for crossover frequencies and ideas on variations to try later. I'll try to get you to the ballpark. The game should be great but your home runs may be far easier with some sort of acoustic measurements gear. Nothing fancy is needed.
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