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Old 20th August 2008, 04:25 AM   #1
rtate is offline rtate  Canada
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Default BOZ input attenuation value??

I'm sure this has been discussed before, so I apologize in advance.
I want to put some input attenuation on my BOZ in the form of a fixed resistor as my only source is a cd player and power is from a leach superamp.

I have been reading for a couple of hours now and can't seem to find a post that has a set value for the input resistor.

I have several good resistors in my kit and don't want to use a pot. I want to set it and forget it!!

Could some one here tell me what value to use??
Thank you
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Old 20th August 2008, 05:49 AM   #2
rtate is offline rtate  Canada
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I also forgot to mention that R107 was left out during the inital build as I am not switching input sources, cd only...

I am not sure if this will make a difference in the value for the input attenuation resistor...
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Old 20th August 2008, 04:54 PM   #3
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One suggestion, would be to wire a 5K or 10K POT on the input. Use it to adjust the input level to your liking, measure it's value, and replace it with a resistor of the same value.

If you have tons of gain from your single source, you might also consider the B1 buffer/pre.

-David
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Old 21st August 2008, 03:22 AM   #4
rtate is offline rtate  Canada
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So I put 47K resistors at theinput for some attenuation.

While it is better, when I have the volume set at its minimum the music is still quite audible..

My concern is that If I increase the value of the resistor I may start limiting the bandwith...
I read that the top end will start to roll off...
Mr. Pass suggested 25K and I am already double that!!

What should I do?
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Old 23rd August 2008, 10:53 PM   #5
rtate is offline rtate  Canada
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So now i have 100k resistors in at the input and still there is volume when the output volume control is at its minimum...

How high can I go without degrading the sound quality??
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Old 24th August 2008, 05:24 AM   #6
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You are way past it. A 10K in series followed by 10K or less is
about ideal.

If you can't get the volume to zero, look to the volume control pot
or the wiring.
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Old 24th August 2008, 05:42 AM   #7
rtate is offline rtate  Canada
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Mr. Pass can you please explain what you mean whem you say
" a 10k in series followed by 10 k or less"
Do you mean 2 resistors in series at the input?

What areas would I check in the wiring?

Thanks you for the response!!
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