I already have a very good DAC, how do I use this with the MiniDSP? - Page 2 - diyAudio
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miniDSP Low cost, modular Digital Signal Processor (DSP) kits for the DIYer from miniDSP.

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Old 18th April 2012, 10:35 AM   #11
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Quote:
Pin - minidsp - spdif receiver
5 - ground - ground
9 - MCLKIN - MCLKOUT (MUST be 12.288 MHz)
13 - I2S_DATA_IN7&8 - I2S data out
14 - I2S_IN_LRCLK - I2S wordclock out
15 - I2S_IN_BCLK - I2S bitclock out

The sabre dac can be connected using these pins:

Pin - minidsp - sabre dac
6 - ground - ground
16 - I2S_DATA_OUT1&2 - I2S in channel 1&2
17 - I2S_DATA_OUT3&4 - I2S in channel 3&4
20 - I2S_OUT_LRCLK - I2S wordclock in
21 - I2S_OUT_BCLK - I2S bitclock in
Wow. Thanks for this. It looks relatively simple.

I don't quite understand about the sample rate limitations though. I was hoping to use the MUX reciver to switch between a cd transport (44.1kHz???), and a Sonos streaming flac files (sample rate ???).

CD/Sonos > Mux > Mini dsp > BuffalloII. Would this work?
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Old 18th April 2012, 12:24 PM   #12
knuisje is offline knuisje  Netherlands
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It only works if the samplerate is 48kHz. The minidsp can't work with 44.1kHz, so you have to insert a samplerate converter. The minidigi uses a SRC4382, a combined spdif-receiver and ASRC for this purpose.
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Old 18th April 2012, 12:30 PM   #13
ccclapp is offline ccclapp  United States
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Quote:
Originally Posted by knuisje View Post
It only works if the samplerate is 48kHz. The minidsp can't work with 44.1kHz, so you have to insert a samplerate converter. The minidigi uses a SRC4382, a combined spdif-receiver and ASRC for this purpose.


Hi thanks for all your great info!

...so then how can minidsp normally play other formats ( when not connected this way ). For example the minidsp "kit" can play all formats up to 24/96, I believe. Why is it more limited here?
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Old 18th April 2012, 12:51 PM   #14
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Quote:
It only works if the samplerate is 48kHz. The minidsp can't work with 44.1kHz, so you have to insert a samplerate converter. The minidigi uses a SRC4382, a combined spdif-receiver and ASRC for this purpose.
OK. So it looks like I will need a mini DIGI also.

miniDIGI | miniDSP

Would you recommend using 12s between Mini dsp and BuffalloII?

It looks like I will need to use spdif between the MUX reciever and mini DIGI???
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Old 18th April 2012, 01:06 PM   #15
knuisje is offline knuisje  Netherlands
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You can also use this product between your mux and minidsp. But the XO must be replaced with a 12.288 MHz one.

With I2S it is possible to output 4 channels from the minidsp (or 8 channels when using 2 minidsp's).
With SPDIF it is only possible to output 2 channels from the minidigi.

Last edited by knuisje; 18th April 2012 at 01:17 PM.
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Old 18th April 2012, 01:54 PM   #16
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Great news.

So: cd transport/Sonos > Mux > Metronome > Mini DSP > BuffalloII using your connection schedule above.

Thanks so much.

Looks like another purchase from TP...
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Old 18th April 2012, 01:59 PM   #17
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This is a bit Off-Thread:

"the Metronome will practiaclly eliminate digital jitter of the I2S data stream."

Does this mean that adding a low jitter clock to my transport (Musical Fidelity A3.5CD) would be pointless?
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Old 19th April 2012, 02:31 AM   #18
Trismos is offline Trismos  Canada
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2 pages in and I see very little from the MinisDSP people to actually address my original post. I see one VERY complicated work around that I can't pretend to understand. So my options are to use my existing superior DAC solution along with a passive cross-over solution, or use an inferior dac so I can have fun with DSP.

This sounds like the CD vs vinyl debate where we'll have some argue one format or 'way' is better than the other. But I'd love to hear some opinions on the matter....
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Old 19th April 2012, 09:29 AM   #19
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miniDSP already suggested to use miniDIGI + miniDSP!

miniDIGI will add digital inputs (optical and SPDIF) to miniDSP avoiding DA/AD conversion using the (probably inferior) internal ADC of the miniDSP. It will further add one digital output so that you can use your own DAC at least for two of the output channels.

So the suggested setup is: digital source (PC/DVD/CD/Streaming client,...) -> miniDIGI -> miniDSP -> miniDIGI -> DAC =>amp

with "->" being digital connections and "=>" being analog connections

hoping this information helps
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Old 20th April 2012, 02:43 AM   #20
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If OP's goal is strictly for digital domain processor, he might also consider other alternatives. In addition to the MiniDSP, I am a happy owner of a Behringer DEQ2496, a veritable "Swiss Army Knife" signal processor. Among other tricks, you can use it for a purely digital domain processor. I think internally it is 24 bit, 96 KHz but I don't know if it resamples. I would guess "yes." I would like to hear more about using the MiniDSP in the digital domain.

I don't want to take business away from MiniDSP, but once you have the additional board(s) you are getting close to the cost of a DEQ2496. Or can it be done with just the basic 2x4 ?
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