Convolution - not working for USB but WORKING for Toslink/Optical

I have a very weird situation where the very same convolution filter (zip) file that I can use successfully on the Toslink/Optical interface (ropieee running Hifiberry Digi+ Pro) does not take for the USB interface.

Log snippet below. Anyone else experienced this?

I know the convolution filter works - I’ve used it before! Seems to have come up when running new speakers (Kii Three’s).


03/26 15:28:43 Trace: [dspengine] saved DSP config {"version":3,"items":[{"type":"convolution","enabled":true,"filter_filename":"","filter_id":""}],"headroom_adjustment":{"type":"headroom_adjustment"},"sample_rate_conversion":{"type":"sample_rate_conversion"},"speaker_setup":{"type":"speaker_setup"},"is_enabled":false,"auto_apply":false}**
_03/26 15:28:44 Trace: [raatserver] [RaatServer bedlam @] connecting (attempt 5)_
_03/26 15:28:45 Warn: [rnet/RnetJsonClient] failed to connect No connection could be made because the target machine actively refused it
_03/26 15:28:45 Trace: [raatserver] [RaatServer bedlam @] client connection failed. Giving up_
03/26 15:28:45 Trace: [raat] [sood] Refreshing device list
03/26 15:28:46 Trace: [Kii Three USB] [Lossless, 16/44 ALAC => 16/44] [100% buf] [PLAYING @ 3:07/3:33] Ωρα - Ωρα - Βασιλική Λαβίνα

Hi @Aris_Theocharides ---- Thank you for the report and sharing this observation you have made with us. The feedback is appreciated!

Moving forward, may I very kindly ask you to please provide me with a brief but accurate description of your current setup using this link as a guide. I want to have a clearer understanding of your Roon setup :+1:

Additionally, since noticing this behavior have you tried…

  • Testing with a different USB cable?
  • Testing with another DAC?
  • Reinstalling Ropieee?


Apologies for the delay.

  1. The behaviour is independent of USB cable.
  2. I haven’t been able yet to see if the behaviour is depended on DAC. Will do over the next week.
  3. Reinstalling Ropieee does not help.

I can confirm that this seems to be limited to the Ropieee software so I think I’ll take it up with the maintainer. On default Debian/Raspberry it works fine.


Hi @Aris_Theocharides ---- Thank you for the follow up, it’s good to hear from you. Hope all has been well!

I wanted to touch base with you on your latest post to see if you have been able to test this behavior with another DAC. Additionally, I wanted to also check if Ropieee was able to offer any insight here, just curious as to what feedback you may have been given.

Looking forward to hearing from you!

I upgraded to Ropieee 20180520-2 and this issue is no longer - convolution applied to USB now works on the Kii Three correctly.


PS: Update 2/6/18 - this isn’t really closed - the issue seems to occur when Roon Server is on Windows. With RoonServer on Linux or MacOS convolution via USB attached works fine.

Also - this isn’t a Ropieee issue, as it occurs with Raspbian.

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