Current plan is to use an RPi2 and convolver software to run the FIR filters that implement the XO. No DSPs involved.
From there I'll output PCM to a multichannel DAC and amp, probably leveraging a gently-used Onkyo HDMI 5.1 receiver (yay Burr-Brown!). Yeah, I know, HDMI jitter, but it's not easy finding decent, inexpensive multichannel DAC and amp, and the receiver kills two birds with one $90 stone.
The receiver will bi-amp my homemade Parts-Express custom two-way speakers, sending one channel directly to each driver.
After budget improves, first upgrade is 4ch asynchronous USB xmos/sabre DAC and dedicated amp.
From there I'll output PCM to a multichannel DAC and amp, probably leveraging a gently-used Onkyo HDMI 5.1 receiver (yay Burr-Brown!). Yeah, I know, HDMI jitter, but it's not easy finding decent, inexpensive multichannel DAC and amp, and the receiver kills two birds with one $90 stone.
The receiver will bi-amp my homemade Parts-Express custom two-way speakers, sending one channel directly to each driver.
After budget improves, first upgrade is 4ch asynchronous USB xmos/sabre DAC and dedicated amp.
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Is there any free alternative to generating a signal similar to Acourate's amplitude inverse generator?
I'm still trying to follow Mitchco's general process, as it seems to line up with what I'm trying to accomplish. I'm just trying to replace each step with a free alternative as I go. The jriver tutorial appears to be geared towards off-the-shelf speakers, rather than my situation of DIY bi-amped two-ways.
I'm still trying to follow Mitchco's general process, as it seems to line up with what I'm trying to accomplish. I'm just trying to replace each step with a free alternative as I go. The jriver tutorial appears to be geared towards off-the-shelf speakers, rather than my situation of DIY bi-amped two-ways.
Don't forget to hookup the HDMI output to a display or it won't work. HDMI does not pass audio only - maybe you already know this. Ask me how I know 😉
Hypex DLCP? Doesn't do FIR but everything is build in, with two extra boards you have yourself a really good pre-amp, with USB, Spdif, coax and XLR's in and out.
Output is analog, but well designed analog. No noise connected directly (plug and play) to the UcD amplifiers...
Output is analog, but well designed analog. No noise connected directly (plug and play) to the UcD amplifiers...
That's odd. I tried my Onkyo and Denon and both of them needed the monitor. Strange.
Exactly. Also, an hdmi audio extractor does not help in this regard. You might be lucky to get 2ch audio out, not the full 7.1 capability of hdmi. If there is a "trick" adapter that I could put on the end of the hdmi cable and then use an extractor I would REALLY like to know about it! But I have not seen such a device.
I have been using HDMI for a little while now. I had a problem on some music as I was getting audible distortion from the woofer. It seems that highly compressed music and/or very low bass would distort. It doesn't happen on all music, just some. One particular album was Jack Johnson's On And On a very bass heavy album. I tried changing woofers (Alpha 15 to GRS 15), media player, plug-ins, etc., same problem. Then I changed from HDMI to SPDIF coax and it fixed the problem.
@CharlieLaub The ALSA driver on Raspian has a hard coded limit for 2ch PCM over HDMI. There's a pull request right now in Raspian to unlock the other 6 channels.
Other software like Kodi works around this restriction by going straight to the Broadcom driver (VideoCore?) for output. See OMXPlayer.
Good discussion in the topic in the JRiver forums here: https://yabb.jriver.com/interact/index.php?topic=97510.0
Other software like Kodi works around this restriction by going straight to the Broadcom driver (VideoCore?) for output. See OMXPlayer.
Good discussion in the topic in the JRiver forums here: https://yabb.jriver.com/interact/index.php?topic=97510.0
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