Separate Left & Right Volume Controls - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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
Reply
 
Thread Tools Search this Thread
Old 21st March 2002, 05:47 PM   #1
diyAudio Member
 
Join Date: Feb 2002
Default Separate Left & Right Volume Controls

I'd like to know if there are any advantages of having separate left & right volume controls on an audio amplfier opposed to one volume control for both channels. Are there any sonic or audible differences? Thanks.
  Reply With Quote
Old 21st March 2002, 06:40 PM   #2
diyAudio Member
 
Join Date: Jan 2002
Location: nowhere
sure, if you want better channel seperation and/or like to have the option of adjusting left/right volume without adding a seperate ballance control. Besides you get a few more types (of pots) to chose from.
The only hastle is adjusting the volume with the two channels following properly. It requires the two pots mechanically linked, no big deal, but adds a bit in building complexity.
  Reply With Quote
Old 23rd March 2002, 11:06 AM   #3
diyAudio Member
 
mrfeedback's Avatar
 
Join Date: Feb 2002
Location: Perth, Australia.
Hello PTL60,

I had a power amp with Alps laser trimmed stepped 21 position vol pots on front panel.
The attenuation was 0dB at full clockwise rotation (with CDP connected directly this gave only momentary and inaudible clip),
coming down in 1 dB steps to -20 dB, then mute.
This provided a stunningly transparent system, with the volume level perfectly settable and repeatable in 1 dB steps.
Separate infinitely variable pots are a straight out pain, but a pair of stepped attenuators works great !
The big advantage here is that you have close matching of L&R gains, and this is quite critical for correct imaging.
It is too hard to set the gains easily with L&R pots, and most dual pots give pretty lousy L/R channel matching.

Hope this helps you,
Regards, Eric.

BTW - despite what some old textbooks say, a level change of 1 dB is perfectly clearly audible.
  Reply With Quote
Old 23rd March 2002, 10:37 PM   #4
diyAudio Member
 
Join Date: Feb 2002
Hello Eric,

Thanks for the info. I've heard about stepped attenuators, but aren't they quite expensive?
  Reply With Quote
Old 24th March 2002, 02:38 AM   #5
diyAudio Member
 
mrfeedback's Avatar
 
Join Date: Feb 2002
Location: Perth, Australia.
Hello PTL60,

Quote:
Thanks for the info. I've heard about stepped attenuators, but aren't they quite expensive?
The ALPS stepped vol pots are not too expensive, but yes some DIY attenuators using high quality rotary switches and Holco or Vishay resistors can end up pretty pricey .
Of course this comes down to a value judgement, regarding your audio system.
I do not have much experience with rotary switch stepped attenuators, so other constructors on this forum may have some better knowlege and comments on these.
The key factor in all of this is close channel matching, and this is the only proper way to get it.

Hope this helps,
Regards, Eric.
  Reply With Quote
Old 24th March 2002, 04:43 AM   #6
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Hey Eric,

Do you have a source/model number for the Alps? I didn't think they made these any more. I used some maybe 20 years ago, and if suitable values are available at a good price could be useful for a couple of projects I have running.

TIA
  Reply With Quote
Old 24th March 2002, 11:28 AM   #7
diyAudio Member
 
mrfeedback's Avatar
 
Join Date: Feb 2002
Location: Perth, Australia.
Hello Brett,
The pots were original equipment in this amp 10+ years ago.
I have been to http://www3.alps.co.jp/index-e.html but a quick look didn't show them.
http://www4.alps.co.jp/pdf2002/pdf_e...shaft/50mm.pdf looks interesting. but price ?
Any body have a review of these ?
An english company was advertising the alps blue pots a couple of years ago in Electronic World magazine - I'll find out for you.

Regards, Eric.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Has Anyone Tried The P&S Volume Controls? dantwomey Chip Amps 5 22nd January 2010 08:57 PM
Separate left-right channel digital signal Paco Digital Source 0 7th February 2007 04:34 PM
Blending Guitar Volume Controls Hyounce Parts 0 9th April 2006 06:45 PM
New version volume controls polsol Parts 2 21st September 2004 01:16 PM


New To Site? Need Help?

All times are GMT. The time now is 02:59 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2