Stereo to Mono Converter - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

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
Reply
 
Thread Tools Search this Thread
Old 12th June 2015, 01:05 PM   #1
jim1961 is offline jim1961  United States
diyAudio Member
 
jim1961's Avatar
 
Join Date: Apr 2012
Location: Texas
Default Stereo to Mono Converter

First, what I am trying to do and why.

Signal path:

DAC -> Passive attenuator (25k) - Power amp (75K)

What I want to add:

Passive attenuator (25K) -> (10K) Stereo to mono converter (10K) -> miniDSP (20K) -> Subs

For the stereo to mono converter, I was considering this: https://www.edcorusa.com/tpc6400

One problem is the back end of the passive attenuator will see a 10K (converter) and 75K (power amp) load. Can I just add say 68K 1W resistors between the back end of the attenuator and the front end of the converter so the back of the attenuator sees 78K and 75K loads in parallel instead of 10K and 75K?

The other concern is whether the back end of the converter (10K) will drive the miniDSP (20K) properly.

Thanks.
  Reply With Quote
Old 12th June 2015, 01:16 PM   #2
Davey is offline Davey  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Bremerton, WA.
The miniDSP will perform the stereo/mono conversion for you. Your proposed scheme seems way more complicated than it needs to be.

Dave.
__________________
"Audio guys do it with volume."
  Reply With Quote
Old 12th June 2015, 01:23 PM   #3
jim1961 is offline jim1961  United States
diyAudio Member
 
jim1961's Avatar
 
Join Date: Apr 2012
Location: Texas
Quote:
Originally Posted by Davey View Post
The miniDSP will perform the stereo/mono conversion for you. Your proposed scheme seems way more complicated than it needs to be.

Dave.
The 4 way advanced wont unfortunately. I am choosing this plug in because I have (3) subs to drive with the miniDSP.

Just trust me that I need to do it this way. Its complicated.
  Reply With Quote
Old 12th June 2015, 02:18 PM   #4
Davey is offline Davey  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Bremerton, WA.
Simply "Y" the two outputs together. The miniDSP 2x4 unit has high enough output resistance that this will not be a problem. I've done it myself many times.

Dave.
__________________
"Audio guys do it with volume."
  Reply With Quote
Old 14th June 2015, 09:25 AM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by Davey View Post
Simply "Y" the two outputs together. The miniDSP 2x4 unit has high enough output resistance that this will not be a problem. I've done it myself many times.

Dave.
I hope you meant to post that the miniDSP 2x4 unit has a low enough output impedance.

The Y cable mixes the stereo channels and affects the crosstalk in the original source feed to the real stereo channels.
One should use a summing stage to ADD the two stereo channels together. This does not affect the crosstalk of the stereo source.

The maximum output impedance of the 25k attenuator is ~6k.
This will cut treble if the cable has significant capacitance.
This will be driving two sets of cables, to the two stereo channels and to the two channels of the summing stage.
The bass only channel does not mind losing some treble.
But the stereo channels must have the treble content preserved You may need to add Buffers at the 25k attenuator to drive these four cables.
__________________
regards Andrew T.
Sent from my desktop computer using a keyboard

Last edited by AndrewT; 14th June 2015 at 09:33 AM.
  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
Any hifi but simple line level stereo to mono converter? Fusion916 Solid State 20 8th November 2013 05:51 AM
My stereo amplifiers produce mono output with stereo source! tsiros Solid State 2 3rd November 2013 07:17 AM
Overlay stereo with mono, without losing stereo? grimerking Analog Line Level 13 27th December 2012 03:06 AM
Looking to make a mono sub from a stereo output while keeping stereo speakers. JForged Multi-Way 17 14th December 2012 01:37 AM
Stereo to Mono Converter bjackson Analog Line Level 6 26th August 2010 05:20 AM


New To Site? Need Help?

All times are GMT. The time now is 07:56 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2