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TOPIC: Sound on muted outputs

Sound on muted outputs 1 month 4 days ago #53424

  • mitchwolos
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Wait. 3-4-5 on the same side? That's insanity. Who's idea was this? I'd like to have a chat with them.
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Sound on muted outputs 1 month 4 days ago #53425

  • swrocket
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Something about the crosstalk between DACs...I'm not an engineer and, TBH, I don't understand it either. But, they know their device and if that's what it takes to get it right, I'm willing to try it.
In my old CDSP 6x8 I didn't have to do that and it's going to be a b***h to wire because the RCAs are designed to go side-by-side...
Open a ticket on the support page and you can communicate by email with them.
Last Edit: 1 month 4 days ago by swrocket.
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Sound on muted outputs 1 month 2 days ago #53480

  • Petererc
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Fwiw routing is

L input> channels 1(tw), 2(mid), 3(mb)

R input> channels 4,5,6

L+R > channel 7 sub
L *R > channel 8 sub

Almost same config as recommended
And get “crosstalk”,
Recently switched input to optical, tomorrow will be able test and see if anything changed
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Sound on muted outputs 1 month 2 days ago #53483

  • swrocket
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I think what they meant was to separate left and right to the two DACs.
Try putting the right input to channels 7,8 and 9 and move the sub to channel 5 & 6 maybe.
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Sound on muted outputs 1 month 2 days ago #53484

  • mdsimon2
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Petererc wrote:
Fwiw routing is

L input> channels 1(tw), 2(mid), 3(mb)

R input> channels 4,5,6

L+R > channel 7 sub
L *R > channel 8 sub

Almost same config as recommended
And get “crosstalk”,
Recently switched input to optical, tomorrow will be able test and see if anything changed

The AK4456 DAC used in the CDSP 8X12 V2 is a 6 channel DAC so they must be using 2 separate DAC chips. To me the suggested routing from miniDSP indicates that channels 1-6 are from one DAC chip and channels 7-12 are from the other. As it seems that the crosstalk issues stem from mixing left/right channels on a single DAC chip it makes sense to me that you would have a crosstalk issue.

Either way I am very interested to see if their routing suggestion solves your problem as I have been interested in the CDSP but these issues have scared me away so far.

Michael
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Sound on muted outputs 1 month 2 days ago #53486

  • Petererc
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I see said the blind man

In mixer
Dirac 1(all left) channel 1(tw), 2(mid), 3(mb) 4(sub), 5(rf)

Dirac 2 (all right) 7,8,9,10,11

That would leave one empty channel on each DAC 6 and 12

I will give that a shot and report back,
The RCA output layout needs to be rethunk if this is the case..
I hope I left enough slop in the RCA cables to make spaghetti . Connecting left tweeter to input 1 and right tweeter to input 7 is a good stretch. Not gonna be happy making new cables,
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Sound on muted outputs 1 month 2 days ago #53494

  • mitchwolos
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I plan on using my 8x12 with an Alpine DSP as an upmixer. L+R+C+Rears.
So, It's possible using all 5 inputs will result in crosstalk?

If crosstalk occurs. Does that mean it's ignoring the crossover settings? Like, Would I have to worry that my tweeters are receiving low frequencies?

Also, That the center would be receiving left and right and rear etc
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Sound on muted outputs 1 month 2 days ago #53502

  • Petererc
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With RCA low level input .

All channels muted, channels 7/8 (sub) have sound

Optical input same config,

no sound any channel

Guessing the digital signal bypasses the DAC?

Using REW SPL meter “A” weighted it is a 13db increase playing test tones. Volume control does not affect the output
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Sound on muted outputs 1 month 2 days ago #53504

  • swrocket
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TBH, I don't know much about the tech part, but my understanding is that the DACs are on the output side of the DSP (RCAs to your amps) so the optical input shouldn't have any effect on that as it is on the input side (ADC) of the DSP...But I'm probably wrong lol.
Last Edit: 1 month 2 days ago by swrocket.
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Sound on muted outputs 2 weeks 5 days ago #53910

  • ckirocz28
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Gonna post this here, maybe it'll help someone, I messaged this to swrocket earlier.
I did have crosstalk, I just never noticed before! Muting channels 9 through 12 stops it, channels 11 and 12 add the most crosstalk, channels 9 and 10 add slightly less (3 or 6 db), channels 7 and 8 add a barely audible amount. The crosstalk is almost unaffected by any eq or crossover settings on the offending (9-12) channels, changing eq or crossover settings changes the crosstalk sound but not in a way consistent with the settings. Muting those 4 outputs at the output, the mixer, or the input stops the crosstalk. I don't know if the crosstalk is output to all channels, I didn't investigate that deeply, I just reconfigured everything to avoid using those channels.
A couple of ideas to avoid this problem, maybe run mids and tweets from those channels so you won't really hear the crosstalk in midbasses or subs (might stiill hear it), or feed those channels with a lowpassed signal that won't be heard in mids or tweets (could be lowpassed with crossover biquads in the input eq). I haven't tried either of these, yet.
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