Toslink input + RL 6000 Stereo

Peter

July 22, 2019 20:27

None

Hi,

I'm running a stereo setup of two RL 6000's, with two Beocreate boards daisychained. I followed your instructions to do so from here (https://support.hifiberry.com/hc/en-us/community/posts/360005450118-RL6000-Stereo-with-toslink), although I needed to have them modified slightly because my register numbers were somehow different ... In my /etc/rc.local, I added:

dsptoolkit write-mem `dsptoolkit get-meta directSlaveSelectRegister` 0
dsptoolkit write-mem `dsptoolkit get-meta slaveChannelSelectRegister` 2

The stereo setup works great overall. I have been using it for a while now to stream music from my NAS/the internet.

Recently, I decided to use the stereo Beocreate boards as my TV speakers as well. In addition to the TOSLINK connection between the master and slave board, I now also have a TOSLINK connection going into the master board from the TV.

Unfortunately, this setup doesn't seem to work: when I want sound from the TV, I only get sound from the slave speaker, and not from the master speaker. This is not the case when the RPi is outputting sound - then I get sound from both speakers ... It seems to be a software issue: I can flip around multiple times between TV and RPi as sound sources, and I will only get sound from the slave speaker on the former, and from both master & slave on the latter.

Am I overlooking some settings here? Is it possible to get stereo sound from both speakers when I get TOSLINK input from my TV?

Thanks,

Peter

Date Votes

1 comment

0

Tuomas August 16, 2019 21:08

Hi Peter,

first of all, my sincerest apologies for not getting back to you sooner, I was indisposed due to some travel.

The daisy-chain stereo setup is very experimental at this point and hasn't been properly tested, so we may have hit an unexpected kink.

A couple of questions to help triage our problem here:

0. In your setup, you have one Raspberry Pi and that's connected to the master board, correct?

1. Do you get sound from the master speaker via Toslink, if you temporarily disable the stereo setup (comment out the commands and power-cycle the system)?

2. Have you tried reinstalling the sound profile? Go to the Sound Profile screen in the setup and select the sound profile again to install it.

3. The DSP program includes a volume control. When you type 'alsamixer' to the terminal, you should see a "DSPVolume" control. If you adjust this when the stereo setup is active and sound is coming from the TV, do you hear a change in volume for the slave speaker?

4. Have you tried swapping the boards with each other?

I'm really puzzled by this, particularly that you get sound to both speakers from the Pi but not from the TV – both scenarios should work, or none. The following diagram and explanation may help understand why.

When you play sound from Toslink or Pi, it should always follow the red path, eventually reaching the speakers. If the daisy-chain stereo is not active, the sound from Toslink will also follow the blue path, directly from input to output. In case it is active, it should follow the green path that continues from the red path, without following the blue path at all.

Now, the input selection (pink) might prevent the red Toslink signal from travelling further if it's not correctly detected, but when daisy-chain stereo is active, that should also prevent it from ever reaching the slave speaker (because in daisy-chain stereo, all sound that's passed to the slave needs to follow the red path).

FYI, I'm working on an all-new Beocreate software release, and it's close to being ready for early-bird testing. In the new version we'll have a daisy-chain assistant that makes it possible to set this up right in the user interface.

I'm impressed by how you creatively combined getting and setting the registers into one command, very nice!

Hopefully this gets us closer to understanding the problem and eventually the solution!

Best,

Tuomas from Bang & Olufsen

Comment actions Permalink

Please sign in to leave a comment.