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Feb 6, 2018

Is Sountouch stereo protocol a lossless protocol?

I'm wondering which is the protocol used by the soundtouch when performing a stereo pairing and if it is a lossless protocol.

 

Specifically i've analyzed in detail the product Soundtouch 10 and it appears to me that a single speaker is able to perform the best when fetching a FLAC file from a DLNA source with maximum file resolution of 16bit/44.1khz.

 

My doubt now is that probably the stereo pairing protocol between two speakers may involve an additional live encoding including a compression protocol with loss.

 

Does anybody have additional information on this topic or has identified a better solution to play a stereo pair with minimal or no quality loss?

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Oct 9, 2017

Re: Is Sountouch stereo protocol a lossless protocol?

Hi. I have a pair of 10's running as a stereo pair and my library contains 100% flac rips...I have never noticed any quality drop compared to playing over a single ST-10, but in all honesty this speaker is not transparent enough to show any obvious quality difference...I believe I can hear a difference on an ST-30 especially in the bass (MP3 bass is overblown compared to lossless). These are always very personal views and this argument fills just about every hardware and forum all over the internet.....I would be interested for further research from yourself and or clarity from Bose on this.
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Re: Is Sountouch stereo protocol a lossless protocol?

Understood. Francly i expect the same having listened to the Soundtouch 30.

 

The questions that stills remain are:

1) Does bose apply any processing before playing FLAC

2) Which protocol is used to do the stereo pair?

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Oct 9, 2017

Re: Is Sountouch stereo protocol a lossless protocol?

Well hopefully we will find out !

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Dec 5, 2016

Re: Is Sountouch stereo protocol a lossless protocol?

Hi everyone,

 

Thanks for the excellent question.  I believe that we rebroadcast lossless audio to our speakers, and there is no sort of processing done to the audio.  I'm not 100% sure on this, so I'm going to ping engineering to see if this is true, and if it isn't what we do with the audio.

 

I will update when I hear back from them 🙂

 

Best Regards,

Brandon - Bose Support

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Re: Is Sountouch stereo protocol a lossless protocol?

Thank you @Brandon_M

 

This is really appreciated!

Knowing this details would help us as users to setup the system in the better (lossless way) and to spread the goodness of your products 🙂

If i'm undestanding well from my analysis you should be broadcasting over WIFI (that is the only media that would offer the necessary bandwidth for it)

 

In the meantime i've analyzed the open ports on the Soundtouch 10 so that this may eventually help other users identify wich is the streaming protocol adopted:

PORT      STATE SERVICE    VERSION
80/tcp    open  http       libwebsockets
111/tcp   open  rpcbind    2-4 (RPC #100000)
8080/tcp  open  http-proxy libwebsockets
8090/tcp  open  http       Allegro RomPager 5.40b1
8091/tcp  open  jamlink?
8200/tcp  open  trivnet1?
17000/tcp open  unknown
17004/tcp open  unknown
17008/tcp open  unknown
17018/tcp open  unknown
30030/tcp open  unknown
30031/tcp open  unknown
30032/tcp open  unknown
40002/tcp open  unknown
40003/tcp open  unknown
40030/tcp open  http       Allegro RomPager 5.40b1
40031/tcp open  unknown
44521/tcp open  unknown
46475/tcp open  unknown
46494/tcp open  unknown
52636/tcp open  tcpwrapped
53041/tcp open  unknown
53855/tcp open  status     1 (RPC #100024)
53927/tcp open  unknown
57771/tcp open  unknown
58449/tcp open  unknown
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Dec 5, 2016

Re: Is Sountouch stereo protocol a lossless protocol?

Hi everyone,

 

We have an answer from engineering!

 

"We redistribute the original audio data, untouched.  We don’t even re-encode.  The exception to this is local sources like aux or HDMI inputs which are compressed and that results in some loss."

 

They will not go into specifics regarding encoding or bitrates for AUX/HDMI rebroadcast.

 

Let me know if there are any other questions.

 

Best,

Brandon