Rank: Member
Groups: Member
Joined: 1/1/2014(UTC)
Posts: 8
|
OK, maybe an overkill project, but as per thread title. I'm trying to realize a LMS (Loudspeaker Management System) with a miniDSP miniSHARC and 4x Opus DACs (8ch total).
Problem is, how to fan out the I2S lines to the 4 DACs.
miniSHARC has the following pins:
MCLK
LRCLK
BCLK
I2S CH1&2
I2S CH3&4
I2S CH5&6
I2S CH7&8
GND
Now, if I connect one Opus DAC I can get sound perfectly. But if I connect two (by fanning out MCLK, LRCLK and BCLK with Y cables) I get only noise. So, if with 2 I get no sound, I suppose with 3 and 4 will get only worse.
Some quick internet search seems to say that fanning out in Y shape should be OK, but it's not. Somebody recommends fan out buffers, but there's no quick & clear way to do it, and my skills and knowledge are way not enough to design my own clock distributor circuit. Can't find anything ready, by the way.
I suppose the obvious answer would be "Why not use a Buffalo 8ch?", but since I already own 3 Opus DACs, I'd like to be able to re-use them.
Any suggestion? Or, could any of you guys at Twisted Pear design an easy-to-stack clock distributor to mate miniSHARC with 4x Opus DACs?
Again, I understand the typical way is miniSHARC + Buffalo. But somehow I love the sound of my Opuses and would like to go down that route.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 1/15/2013(UTC) Posts: 49  Location: DC Thanks: 1 times
|
I was originally going to try this with 3 Opus. I decided to go the Buffalo route. However, there is a thread on the MiniDSP site in the USBstreamer section where someone had success wiring the clocks one after the other in a single line instead of fanning them out. that might get you in the right direction.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 1/1/2014(UTC)
Posts: 8
|
Thank you dariedel2. Tried both fanout (star) and daisy chain (miniSHARC to Opus 1, Opus 1 to Opus 2...). Both same, noise & no sound. I saw that thread, actually also found another one where daisy chain failed and fanout worked!
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,868
Location: Massachusetts, USA
Thanks: 2 times
Was thanked: 141 time(s) in 134 post(s)
|
How long are your wires? I assume you are stacking the DACs. Edited by user Thursday, June 22, 2017 8:05:51 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 1/1/2014(UTC)
Posts: 8
|
Yes, stacking the DACs and the miniSHARC is facing them. So wires are around 5cm.
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
