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Old 16th April 2010, 02:21 AM   #1
kudret is offline kudret  Canada
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Default B1 and impedance matching?

I am building a B1 and trying to decide where to use it in the audio chain.

Here is what I have:
Krell CD-DSP MkII > Cary SLP70 > EV Dx38 > QSC PLX 1202 for LF + DIY 2A3PP amps for HF > Klipsch Jubilee 2-way speakers.

Krell CD: Output impedance unknown.
Cary SLP: Input 47K ohms; Output: 800 ohms
Ev Dx38: Input: 20K ohms
QSC PLX: Input 6K ohms (unbalanced) and 12K ohms (balanced)
DIY 2A3PP ams: Input impedance unknown.

I removed Cary SLP70 from the chain and inserted a 10K pot. I like the clarity and the detailed sound stage I am getting but there is some loss of air and bass. I was planning to use B1 instead of the 10K volume pot. Is this the best place to insert the B1?

Kudret

Last edited by kudret; 16th April 2010 at 02:34 AM.
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Old 16th April 2010, 02:46 AM   #2
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Maybe, but you won't know until you try it.

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Old 16th April 2010, 09:01 AM   #3
Gordy is offline Gordy  United Kingdom
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Quote:
Originally Posted by kudret View Post
Is this the best place to insert the B1?
Replace Cary / 10k pot? Yes, that would be the sensible place.
Will very likely be better than Cary.
Might be better than 10k pot.

Does your EV Dx38 processor have a volume control? If so try:
Krell CD-DSP MkII > EV Dx38 > etc.
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Old 16th April 2010, 02:52 PM   #4
kudret is offline kudret  Canada
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Quote:
Originally Posted by Gordy View Post
Does your EV Dx38 processor have a volume control? If so try:
Krell CD-DSP MkII > EV Dx38 > etc.
This exactly what I did. I used balanced out from CD to balanced in on Dx38.

Yes, Dx38 has 2x10K separate internal pots. I bypassed the internal pots with an external better 10K dual pot. This has improved clarity and the sound stage a lot but there is some loss of bass and air.

Kudret
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Old 16th April 2010, 09:35 PM   #5
Gordy is offline Gordy  United Kingdom
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Quote:
Originally Posted by kudret View Post
...but there is some loss of bass and air.
I have no idea what causes that.

I suppose you can now try with the B1 between CD and Dx.


Quote:
Originally Posted by kudret View Post
...Dx38 has 2x10K separate internal pots. I bypassed the internal pots with an external better 10K dual pot. This has improved clarity and the sound stage a lot...
That is surely a good thing. I hope your experiments with the B1 make it even better!
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Old 26th April 2010, 04:52 AM   #6
kudret is offline kudret  Canada
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I finally finished my B1. I posted a picture here: B1 Buffer Preamp

As I said in the other post, it sounds better than the 10K pot for the most part - it beefed up the bottom end. The top end seems a bit harsh. It's also less forgiving with some CDs. I need to listen to it more for a better judgment, but I like it so far.
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