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Old 26th May 2010, 03:12 PM   #131
chemania is offline chemania  United States
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It seems not to be any more extended up kinda "bumped" at about 80-100 hz but I cannot be sure without a visual. I will check with truerta with a voltage divider on the amp output and get back to you guys.
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Old 26th May 2010, 04:00 PM   #132
AndrewT is offline AndrewT  Scotland
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It's possible the response was bumped up naturally due to room/speaker interface and Qbox.
The amplifier and/or preamp/source could have corrected this bass emphasis by having a low Q roll off.

Putting in the buffer that has a wideband response could return the system to that natural bass emphasised response.
If that scenario exists then sorting the problem rather than covering it up with response tailoring would probably be the better option.
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Old 27th May 2010, 03:07 PM   #133
marchel is offline marchel
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Dear All,

First, I'd like t say that I'm not the most talented and hardest working DIYer, You can call me lazy, I could have made my own pcb and bought the parts individually , But I bought a kit. The only thing that needed more work is the casing . Pix below.

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Old 27th May 2010, 03:10 PM   #134
marchel is offline marchel
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The psu is a 19V switch mode psu from my laptop, located on a separate plastic casing. The connection between the pre amp and the psu is non detachable type. You can see that I use an IEC socket to pass through the dc wire.
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Old 27th May 2010, 03:14 PM   #135
marchel is offline marchel
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The casing I use is a midsized aluminum , with thick panels. It took me quiet a while to make the knob nice when turning, The mechanics of the extension system must be aligned properly to make it feel nice when turning.

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Old 27th May 2010, 10:22 PM   #136
marchel is offline marchel
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I almost forgot to say that it sounds fantastic, The most transparent pre amp I've heard by far.

I prefer to use a 50k pot, I find it sweeter sounding than a 25 or 20k pot, The pot I'm using right now will be change into a TKD pot, As soon as it arrives.

I also opted not to use the selector, Cause after some extensive listening and comparing 2 identical b1 kits (yes I bought 2 kits), I find that the best sound is by directly connecting the pot to the input, Without the selector. The selector I experimented on was a Japan made expensive gold plated dpdt selector, Even the solder terminals are gold plated., cost me $25- . But by doing this , I lost a bit of convenience, But then I use a dac that automatically selects digital sources and I don't have any other source, So this configuration works well for me.

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Old 28th May 2010, 02:30 AM   #137
bigaudioscotto is offline bigaudioscotto  United States
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Marchel
How do you wire B1 without selector switch.
I may do this also.
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Old 28th May 2010, 03:55 AM   #138
jleaman is offline jleaman  Belgium
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Marchel, GREAT WORK YOU HAVE THERE! very sexy clean and just amazing, keep it up!
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Old 28th May 2010, 04:49 AM   #139
jimbo51 is offline jimbo51  Australia
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B1 builders thread
Quote:
Originally Posted by marchel View Post
But I bought a kit.

Just a shame that you appear to have purchased from a source that continues to illegally use Nelson's IP!
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Old 28th May 2010, 06:39 AM   #140
marchel is offline marchel
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Quote:
Originally Posted by bigaudioscotto View Post
Marchel
How do you wire B1 without selector switch.
I may do this also.

It's easy, I directly connected the pin 1 and 3 of the pot to the ground and signal terminal respectively , Of the input RCA socket.
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