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In Reply to: Thuneau Allocator - do I get this straight? posted by carcass93 on December 15, 2009 at 09:47:36:
I was comparing a stock Behringer DCX2496 with STOCK outputs to a M-audio Revolition 7.1 24/192 capable PCI card.
I used identical transfer functions in each crossover for it to be a fair comparison (i.e. I did not use phase correction or any other features that the Behringer could not do).
I have since modded my Behringer to have passive single ended outputs which sound a whole hell of a lot better than the stock balanced outputs littered by scads of cheap op amps fed with god-knows-what quality DC. I used clarity caps for coupling caps. I also modded the digital input quite a bit. I removed the 110ohm AES/EBU transformer (which is "sorta" SPDIF compatable) and put in a proper SPDIF 75ohm terminating resistor network according to the receiver literature. I then upgraded my mod and replaced the purchased 75ohm SPDIF cable with RCA ends and installed an isolated RCA jack on the back and ran quality 75ohm coax directly to the board and terminated with a 75ohm terminating resistor. I think just routing the SPDIF input direct with a proper 75 ohm termination is better than the "through board traces and ribbon cables" foot-long path to an incorrectly sized transformer for SPDIF. Even in the Behringer literature it says that SPDIF could 'very well work' but they do not guarantee it. The Behringer digital input was designed for AES/EBU 110ohm and is NOT optimized for SPDIF. And making a "AES to SPDIF adapter" with a RCA to XLR cheater cord does not cut the mustard here. Sure it "works".... but it's not the best. I am not getting the "frying egg" problem with the CS8416 digital receiver chip like some people are getting a LOT. I think it happened ONCE and I reseated the ribbon connectors and it worked again. It was probably cycling the power that did the trick! ;)
I just might pull out the old Behringer again since I have one design which does not require variable Q crossovers and uses "textbook" filter Q's and next to no equalisation. Then I could compare the two quite easily.
There is nothing stopping Behringer users from using the Arbitrator in the signal path. In fact, you would then only need the standard 2-channel VST host plugin for Foobar / Winamp. The Arbitrator does not apply the phase correction to specific channels - it applies it to the input signal AFAIK, so this should work.
Foobar -> VST plug -> Arbitrator -> SPDIF OUT -> Behringer
In fact... Arbitrator will work with any DAC and any set of speakers. If you know the crossover points and ACOUSTIC slopes (Not electrical slopes by counting passive components) you can dial in the phase correction and make ANY SPEAKER on the planet truly transient perfect.
Cheers,
Presto
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Follow Ups
- Wow - that was an OLD shootout! :o) - Presto 14:31:07 12/15/09 (0)
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