BOZ input attenuation value??

rtate · 20th August 2008, 03:25 AM

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

rtate · 20th August 2008, 04:49 AM

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...

hifimaker · 20th August 2008, 03:54 PM

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

rtate · 21st August 2008, 02:22 AM

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?

rtate · 23rd August 2008, 09:53 PM

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??

Nelson Pass · 24th August 2008, 04:24 AM

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.

rtate · 24th August 2008, 04:42 AM

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!!

20th August 2008, 03:25 AM	#1
rtate diyAudio Member Join Date: Jan 2002 Location: Burlington, Ontario, Canada	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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
attenuation using I/V	ailouros6	Digital Source	14	15th October 2008 06:20 PM
Input voltage attenuation	jeffdavison	Tubes / Valves	14	13th September 2008 03:21 AM
Input attenuation on Leak amp	patrickamory	Tubes / Valves	15	16th July 2007 05:52 PM
10 dB attenuation box	june	Parts	2	20th July 2004 04:07 AM
Attenuation	Nappylady	Multi-Way	3	18th February 2003 12:07 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th August 2008, 04:49 AM	#2
rtate diyAudio Member Join Date: Jan 2002 Location: Burlington, Ontario, Canada	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...

20th August 2008, 03:54 PM	#3
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	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

21st August 2008, 02:22 AM	#4
rtate diyAudio Member Join Date: Jan 2002 Location: Burlington, Ontario, Canada	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?

23rd August 2008, 09:53 PM	#5
rtate diyAudio Member Join Date: Jan 2002 Location: Burlington, Ontario, Canada	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??

24th August 2008, 04:24 AM	#6
Nelson Pass The one and only Join Date: Mar 2001	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.

24th August 2008, 04:42 AM	#7
rtate diyAudio Member Join Date: Jan 2002 Location: Burlington, Ontario, Canada	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!!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)