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Old 10th July 2012, 10:24 PM   #41
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20ms for all channels but the subs will do just fine. The X-over wizard I
was linking to earlier will only give me 21,3ms in total for all channels.
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Old 10th July 2012, 10:31 PM   #42
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by dahlberg View Post
20ms for all channels but the subs will do just fine. The X-over wizard I
was linking to earlier will only give me 21,3ms in total for all channels.
No problem for your setup: the board has over 1s of delay (at 96 kHz) to share between the channels.
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Old 11th July 2012, 09:25 AM   #43
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I'm interrested too, seems to be a very very good project.

Some questions :
Quote:
Originally Posted by chaparK View Post
So I can reveal now that the board has following IOs:

- Stereo analogue input : Balanced ?
- 8 analogue outputs with analogue volume control : Balanced ?
I consider it as a real DIY MiniDSP alternative. I am right ?
You say about pricing that it will be cheap, could you elaborate ?
What about the PSU ?

Thanks

Phil
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Old 11th July 2012, 09:37 AM   #44
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Quote:
No problem for your setup: the board has over 1s of delay (at 96 kHz) to share between the channels.
Ok, so that will not be a problem
Then, lets just for arguments sake say that I don't think that it will sound
good enough for use in the upper region (my experience so far with other
products of this kind). What is the delaytime through the filter, 3ms as in
some pa-filters or..... ? I'm running a half dsp, half passiv solution as an
evalutionsystem today that's not perfect but it works fairly good anyway.

I will be using the filters analog input (not all digital yet ) and from earlier
experience the adc has been the main concern for any shortcomings.
Do you belive that this might be the case with this product ? You have been
asked about what dac's and adc's used earlier and I respect that you don't
want to be specific about it yet, but I belive that you understand my concern.

Keep up the good work

Last edited by dahlberg; 11th July 2012 at 09:40 AM.
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Old 11th July 2012, 10:18 AM   #45
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About pricing, I truly hope that you are setting high quality before lowest
possible price, at least concerning adc, dsp and dac's. In my opinion the
world doesn't need another cheap toy. A world class dsp crossover that
would send all passiv/analog filters to history is something else .

To replace opamp's with other sorts or for instance tube based solutions is
something most of us will handle without problems so if you want to keep the
price down maybe you should consider leaving out parts in the analog section.
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Old 11th July 2012, 11:34 AM   #46
qusp is offline qusp  Australia
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Quote:
Originally Posted by korben69 View Post
I'm interrested too, seems to be a very very good project.

Some questions :


I consider it as a real DIY MiniDSP alternative. I am right ?
You say about pricing that it will be cheap, could you elaborate ?
What about the PSU ?

Thanks

Phil
I already asked about balanced, but regretted even asking, its pretty obviously not balanced, there are RCA connectors and 8 opamps. 8 balanced would require 16 outputs, which it clearly doesnt have. I would suggest, as some of us are already thinking, that if you want balanced you should just use the digital outputs. I'm pretty sure since the XO will probably be done without reference to polarity, that it shouldnt matter whether you use a balanced DAC afterwards or not.
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Old 11th July 2012, 01:47 PM   #47
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by korben69 View Post
You say about pricing that it will be cheap, could you elaborate ?
What about the PSU ?
Salut Phil,

I really don't have pricing information so far, but I'm making sure it's going to be affordable. You'll be positively surprised.

PSU requirements are 5V and +/- 12V.

Quote:
Originally Posted by dahlberg View Post
What is the delaytime through the filter, 3ms as in
some pa-filters or..... ?
System Input/output delay is 1 sampling clock: that's the delay when you turn off all processing.
Now of course you don't want to turn off all processing. So delay is basically subject to what processing you've enabled on the signal path.

Quote:
Originally Posted by dahlberg View Post
About pricing, I truly hope that you are setting high quality before lowest
possible price [...]
It's going to be cheap and very good quality. If you have specific requirements, keep in mind that the board has in standard SPDIF and I2S for both inputs and outputs and hence can accommodate your own equipment.
In that case you can always use the analogue section for blind tests evaluating your own ADC/DAC
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Old 11th July 2012, 02:39 PM   #48
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Quote:
Originally Posted by chaparK View Post
Salut Phil,

I really don't have pricing information so far, but I'm making sure it's going to be affordable. You'll be positively surprised.

PSU requirements are 5V and +/- 12V.



System Input/output delay is 1 sampling clock: that's the delay when you turn off all processing.
Now of course you don't want to turn off all processing. So delay is basically subject to what processing you've enabled on the signal path.



It's going to be cheap and very good quality. If you have specific requirements, keep in mind that the board has in standard SPDIF and I2S for both inputs and outputs and hence can accommodate your own equipment.
In that case you can always use the analogue section for blind tests evaluating your own ADC/DAC
the group delay and latency of the adc/dac will count for most of the delay in the system. A typical sigma delta codec can have 1-2 ms worth of delay from input to output. Provided you used the same adc/dac combo for all channels the delay is immaterial
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Old 11th July 2012, 03:04 PM   #49
chaparK is offline chaparK  Luxembourg
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If you are concerned specifically about the AD/DA section delay, then it varies with sampling frequency and can be as low as 10 FS clock periods in/out at 192 kHz according to datasheet (not measured).
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Old 11th July 2012, 04:10 PM   #50
Shaun is offline Shaun  South Africa
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Some questions:

(1) Is this project still subject to the maxium production quantity constraints of the original project?
(2) What is the envisaged building block configuration? Will it be user-configurable?
(3) What kind of GUI will the control software have? (I like the GroundSound interface).
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