Digital crossover signal routing - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 4th December 2007, 11:28 PM   #1
Thunau is offline Thunau  United States
diyAudio Member
 
Thunau's Avatar
 
Join Date: Mar 2001
Location: PA USA
Default Digital crossover signal routing

During swapping amplifiers recently I decided to try a different than the usual routing of signals on my sound card. I found something worth noting. Here is the background:

Different converters have different specs when it comes to channel separation, especially when you consider the different analog stages that follow the DA converter chip. Normally it is natural to assign bass left and right to one pair of outputs, mids left and right to another pair and so on. So with that "normal" connection left and right channel separation spec of the converter is preserved. Left bass information bleeds into right bass, left mids bleed into right mids, left highs bleed into right highs.

I decided to organize my crossover outputs in a different fashion to see if there is an audible difference. So, I connected outputs 1-4 on my 8 channel converter to the left speaker and channels 5-8 to the right speaker. Now the bleed within each stereo converter is between lows and mids1, and mids2 and highs. But, the crossover filters overlap anyway, so the bleed is much harder to detect. With this configuration our left and right speakers don't share any part of the stereo converters- other than common power supply.
I have to report that in my system the separation of speakers with this configuration is definitely improved. The stereo image is better defined.
The connection goes as follows:
allocator out - sound card out
1 - 1
2 - 5
3 - 2
4 - 6
5 - 3
6 - 7
7 - 4
8 - 8

You can also see the diagram I drew to illustrate the two different connections. www.thuneau.com/images/allocator-connections.pdf .
Notice the amplifier channels are also better isolated in this connection.

Improved separation might not be the case with every sound card or converter on the market, but it makes a difference with the Alesis AI-3 and the 8-channel Lab Gruppen C 10:8X amplifier I just got.

BTW, the Lab Gruppen switcher is very nice with the only drawback being the fan which is audible even at the low setting- but only with very quiet music. It's about as loud as a normal PC. Once the music is played at normal level- 75-80dB SPL I can't really hear the amp fan.
The low frequency control and clarity of the amp is outstanding. It should be worth building a little iso-enclosure to suppress the noise.
__________________
"Most people just say what they know, the wise ones know just what to say."
  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
take digital signal from cd player tralala Digital Line Level 9 26th March 2009 06:31 AM
Routing signal yngwie Analog Line Level 0 17th June 2007 02:45 AM
Progress report - digital crossover as a DAC - digital all the way to the amps Ken L Multi-Way 0 26th November 2006 11:42 PM
splitting a digital signal bser Digital Source 4 26th October 2005 05:43 PM
Get digital signal from an old CD-Rom without digital output genome Digital Source 5 3rd February 2004 11:54 PM


New To Site? Need Help?

All times are GMT. The time now is 07:59 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