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Old 28th January 2013, 11:10 AM   #31
tinitus is offline tinitus  Europe
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a different power supply most likely makes a small difference, yes
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Old 28th January 2013, 11:57 AM   #32
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by murphythecat8 View Post
how can you know if mine have a problem? As I said, the sound is good, they is no obvious flaws. However, the high are slight more harsh, the vocal seems a bit more in the background. its small differences really. goignj from 100% to 90$ I would say...
yes I do need a preamp. I have two outputs (one for my mid and tweeter and one for my bass, im bi-amping my speakers) and I added a crossover in one of the outputs.
Well, you stressed the flaws to the sound with the buffer inserted, therefore most people thought you have a problem in your B1.
According to your signature I assumed you were using headphones.
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Old 28th January 2013, 01:59 PM   #33
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k thanks guys, I'm in the middle of my three-way project, so I will be playing with my pre within a month.
I'll report back.
I use a 100k noble pot
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Old 28th January 2013, 02:03 PM   #34
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by murphythecat8 View Post
....and I added a crossover in one of the outputs.
Quote:
Originally Posted by murphythecat8 View Post
..... I do hear degradation when the sound oes thru the preamp versus going straight to my headphone amp...
ahh...I take you mean when using your headamp as pre....and you have the same biamp/xo setup on your head amp ?
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Old 28th January 2013, 03:51 PM   #35
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There's a lot of ground there being covered by the impedance of the volume pot. I experimented quite extensively with mine and 100K at the input gave the best results.

If you go to the pass DIY web site and look at the original design the pot should be at the input of the B1. It does work at its best there.

LDR was rubbish. ALPS was better, decent Ladder Attenuator was best.
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Old 28th January 2013, 06:32 PM   #36
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Quote:
Originally Posted by tinitus View Post
ahh...I take you mean when using your headamp as pre....and you have the same biamp/xo setup on your head amp ?
I have a selectable swicth that allow me to run fullrange or to cross the signal around 300hz. this output is for my mid/tweet, and I ahve another output going in my subamp with crossover .
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Old 28th January 2013, 07:07 PM   #37
tinitus is offline tinitus  Europe
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did you considered a trafo for signal splitter ?
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Old 30th January 2013, 02:53 AM   #38
ra7 is offline ra7  United States
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Do you know the input input impedance of the two amps the b1 is trying to drive?
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Old 30th January 2013, 05:21 AM   #39
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lol, no. thanks for the help now, I may have asked a bit too early for guidance.
thing is, right now, as we are speaking, I am rebuilding my push pull tube amp with a whole new design and also just finishing my three-way project (I actually finished the crossover yesterday!). I will be back to the preamp situation once everything is done and that im ready to really concentrate on the pre amp situation. I will probably build a tube pre to compare to get my conscience clear.
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Old 30th January 2013, 09:09 AM   #40
AndrewT is online now AndrewT  Scotland
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Murph,
have you measured Vgs yet?
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