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#31 |
diyAudio Member
Join Date: Jun 2016
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This is not an ESD protection, it is the RFI filter you have added.
![]() Anyway, this has to be as close as possible to the connectors. Last edited by dspverden; 20th February 2019 at 09:46 PM. |
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#32 |
diyAudio Member
Join Date: Jun 2016
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@all: Today I have added a little video clip showing you how to make a two-way crossover with dspControl! Making a crossover has never been that easy!
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#33 |
diyAudio Member
Join Date: Sep 2011
Location: Luxembourg
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Hello
Nice project - is It possible to daisy chain to have say 10 or 12 outputs (4 ways + several subwoofers) - can It do FIR, if so how many taps maximum and per channel - is it possible to have single ended outputs All the best for the project Jean-Louis |
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#34 | |||
diyAudio Member
Join Date: Oct 2011
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Quote:
Quote:
It's common for balanced inputs and outputs to be "passively" switched to single ended by shorting or ignoring the negative intput/output. Of course the resulting question is whether or not this is the right way to do it. Ultimately it depends on your results. The best way to do it for sure would be to actively convert single ended to balanced in the inputs, and balanced to single ended on the outputs. However, in practice it will still work... And in practice you will get excellent results, as long as the wires are kept short on the single ended signals. They no longer have common mode rejection. The thing to keep in mind is that balanced signals are usually sent at +4dB and single ended (consumer) signals are usually sent at -10dB. So the getting started guide also suggests that you need to modify the gain settings of the output (in the software) to compensate for the difference. Quote:
So I have a question... Can that same RFI filter work on the outputs? Also, can the negative pin of the output be grounded? Should it be? I'm trying to determine if we can use the same part for both inputs and outputs (with the RFI and with or without the grounded negative pin). I'm working on some other schematics to show XLR inputs/outputs, 1/8 inch (3.5mm), and 1/4 inch. I'm also considering drawling up the schematics for an active input/output setup as well. I figured documenting the recommended configuration is the first step. Last edited by JayShoe; 22nd February 2019 at 01:53 AM. |
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#35 |
diyAudio Member
Join Date: Oct 2011
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Raphael, can you confirm whether or not these two connectors would work as a passive input/output connector for RCA or XLR?
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#36 |
diyAudio Member
Join Date: Oct 2011
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This quad RCA connector would look like this.
And here is the schematic (unverified). **** I'm trying to figure out if my quad connector is backwards (Left/Right). |
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#37 |
diyAudio Member
Join Date: Feb 2014
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This is an awesome project! I'm very excited about this. This is almost exactly what I want to do myself, but you guys did it! I would like to help out with the DSP algorithms at some point.
I'm wondering, have you guys ever thought of making a smaller version of this board, but just 4 channels? I would like to put this in a small active speaker. |
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#38 | |
diyAudio Member
Join Date: Oct 2011
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Quote:
In your case about the small active speaker concept there is a nice amp module on the FreeDSP site. Amp2 (freeDSPx AMP x2 - Google Docs) and Amp4 (freeDSPx AMP x4 - Google Docs). In your case for the small active speaker I don't know if you need the XMOS chip at all. Unless you want the speaker to have USB audio you wouldn't need to solder on that chip at all. You would want the ESP32->ADAU1452 and then whatever expansion board you want. By the way - the current Aurora model does in fact have a freeDSP expansion header. So if you want to test out any other freeDSP expansion boards (inputs/outpus/amps/etc) then you can test it with the Aurora and then move onto your own custom PCB when you have it figured out. It's a wonderful prototyping tool because it has a really flexible architecture. |
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#39 |
diyAudio Member
Join Date: Jun 2016
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Jay, for RCA connections I would recommend to leave the neg. output open else you may overload the inverter.
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#40 |
diyAudio Member
Join Date: Jun 2016
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Yesterday I had a short moment for doing some measurements, thus, here are some numbers for you:
DAC: -103dB @ 1kHz, 0dBfs, fs=48kHz ADC: -101dB @ 1kHz, 0dBfs, fs=48kHz Latency: 1.125ms (talkthrough ADC->DSP->DAC) |
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