best balanced volume control solution ? - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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
Thread Tools Search this Thread
Old 27th November 2012, 10:36 PM   #1
diyAudio Member
Join Date: Dec 2010
Default best balanced volume control solution ?

Hello all,

Some of you can maybe help me to choose the best sounding solution to my balanced volume control problem?

I have a nice DAC board with balanced XLR outputs and I just bough a pair of professional studio monitors with balanced XLR inputs. That sounds good but I have no output volume control. I would like to add a volume control system at the output of my DAC board (see project.jpg)

- Target : choose the volume ctrl solution that will have the less impact on the sound quality (be the most transparent as possible)

- Constraints : since I live in a flat I usually listen to my music at low volume so I want to keep the best possible performance when volume is low

After searching on the web, here are some potential solutions :
Please help me to choose the best sounding one.

Solution 1: Passive resistance network (see solution1.jpg)
I found this recommended resistance networtk to control the volume using a simple potentiometer, but I am not very confident in its ability to drive correctly the amplifier input load at low levels.

Solution 2: passive resistance network + THAT 1606 balanced line driver (see solution2.jpg)
The THAT 1606 balanced line driver adds an additional stage in the signal path but it is a dedicated balanced driver that should drive correctly the amplifier input load even at low level.

Solution 3: back to unbalanced (see solution3.jpg)
Is it really a good a solution to go back unbalanced??? I am not confident in it.

Solution 4
: digital volume control before DA conversion : doesn't look a good solution since I will not use the full dynamic range of the DAC.

Any other good sounding solutions are welcome
Attached Images
File Type: jpg project.jpg (24.9 KB, 475 views)
File Type: jpg DAC IV bal output.jpg (27.3 KB, 470 views)
File Type: png solution1.png (5.8 KB, 481 views)
File Type: jpg solution2.jpg (32.2 KB, 479 views)
File Type: jpg solution3.jpg (42.9 KB, 471 views)

Last edited by cocojazzsta; 28th November 2012 at 12:14 AM.
  Reply With Quote
Old 27th November 2012, 11:22 PM   #2
diyAudio Member
Speedskater's Avatar
Join Date: Sep 2002
Location: Lakewood, Ohio
Does your DAC have enough output to drive the speakers to full volume? How about way more than full volume?

If you haven't tried the above, first re-record something at a minus 40 or 60 dB level so you don't blow them up.
  Reply With Quote
Old 28th November 2012, 12:00 AM   #3
diyAudio Member
Join Date: Dec 2010

Yes the DAC ouput can drive the monitor to full power.
  Reply With Quote
Old 28th November 2012, 10:40 PM   #4
JKoch is offline JKoch  Poland
diyAudio Member
Join Date: Dec 2005
Location: Gdansk

From many months I search good sounding solution of digital potentiometer too. Now I work on optocouplers but I still afraid about influence into sound quality. I consider to implement the THAT2180 (voltage controlled amplifier) or TPL8002-25. Maybe the last IC would be sufficient? I do not know. I checked them. Does anybody use the TPL8002-25 as a digital audio potentiometer and what result obtained?
  Reply With Quote
Old 29th November 2012, 02:23 AM   #5
DUG is offline DUG  Canada
diyAudio Member
Join Date: Jan 2003
Location: mississauga ontario canada
I like solution 1...KISS principle

log taper good quality pot

put it in a shielded box...metal can
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 29th November 2012, 10:31 PM   #6
diyAudio Member
Join Date: Dec 2010
Thank you for your answers,

I am asking myself if I can use solution 1 in front of a B1 buffer or a DCB1 buffer?
  Reply With Quote


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
Balanced Buffer Needed with a Balanced Volume Control? DualTriode Analog Line Level 5 9th September 2012 04:37 AM
A digitally controlled volume control solution ybserge Chip Amps 2 4th January 2007 09:31 PM
A digital volume control solution ybserge Chip Amps 0 4th December 2006 04:37 PM
balanced volume control diy student Solid State 2 16th January 2002 12:23 AM

New To Site? Need Help?

All times are GMT. The time now is 03:20 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2