After loading profile dspdac-noautomute.xml, no bass at all was coming from my speakers any more. Is this by design or did I made a mistake in the configuration somewhere? It took me some time to find out that this profile caused the issue. What I need is a profile without auto mute.
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HiFiBerry team Unfortunately I can't say. No bass is usually a problem if one of the speakers is running inverted. Or check the filters that you applied.
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Paullangemeijer I found the issue: the noautomute profile gives a DC offset of 1 V while the default profile has no offset at all. Because the amplifier has no input capacitor, an opamp in the filter gets saturated. One solution is to add capacitors to the amplifier. At the other hand, one should not expect such a big offset from a DAC. It can cause serious switch-on clicks. My question is: can you supply a noautomute profile without an offset? Thanks in advance!
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Paullangemeijer I solved the issue by creating a new profile using SigmaStudio. The profile was derived from dacdsp-v11 and the automute block was removed. Now it is working fine.
This leaves me with a question: why isn't the automute feature not mentioned in the documentation? At least some people have issues with this 'feature'. Note that the documentation on github (rew_basics.md) is out of date.
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HiFiBerry team Please let us know what exactly in the documentation is out-of-date. Alternatively, you can also directly edit it on Github and send a pull request.
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Paullangemeijer There are many small differences between https://github.com/hifiberry/hifiberry-dsp/blob/master/doc/rew-basics.md and https://www.hifiberry.com/docs/software/implementing-room-acoustics-correction-using-rew/.
The first one (on Github) seems older but it does mention how to load the profile for the DAC+ DSP: dacdsp-default.xml.
The installation sections are very different.
In section "REMOVE THE FILTERS" on Github is stated: "dsptoolkit remove-iir-filters". Should be "dsptoolkit clear-iir-filters".
By the way, the latest Apple laptops don't support toslink output anymore. For my Windows laptop I bought a "USB-C DAC Toslink Optical AUX Audio Adapter" at AliExpress. And also a 5m optical cable (search on: "Mini 3.5mm Plug Digital Optical Audio Cable SPDIF Optical Fiber Line To Round Mouth TOSLINK Optical Audio Connector").
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