[AudioI] FW: Re: Audio Pro Soundcard for Tidal streaming

Wed Jan 17 19:17:53 UTC 2024

 Iain,
You should order the RCA preamp board if you plan on connecting it to something with RCA (single-ended or unbalanced) inputs. You should order the XLR preamp board if you plan on connecting it to something with XLR (differential or balanced) inputs.
The advantage to the Pro is the 192 kHz sampling rate and lower noise.
"192 kHz" is the sampling rate, which means you have 96 kHz of analog bandwidth using that sampling rate. These questions are out of scope of this mailing list as it's specifically for Audio Injector support.
Jonathan

    On Wednesday, January 17, 2024, 9:53:56 AM EST, Iain Mott via People <people at lists.audioinjector.net> wrote:  

Jonathan,

I bought the XLR Pro board (i had already purchased the base Pro board). I noticed something I hadn't before, that is that the analogue "bandwidth" is rated at 96kHz - as is the bandwidth on the RCA Pro board. The Pro Board is 192kHz/24bit. Does that mean a 192kHz/24bit FLAC stream is first down-sampled to 96kHz in the process of converting the signal to audio?

My other related question is: What is the advantage of using the Pro RCA/Pro Injector cards over the old Audio Injector Stereo card? - (ignoring the lack of volume controls and headphone jack)

Thanks,

Iain

 Em 16/01/2024 19:45, jr52884 escreveu:

  Iain, 
  I don’t know if it sends recompressed audio over the network, but if I was going to play audio, I would have the player running on the device that the soundcard is connected to.  
  Only you can make the determination whether a 192 kHz soundcard is best for your application. In my application, I record radio signals up to 96 kHz and use single ended audio for a 60 kHz radio signal. What is important is reducing the noise in your system.  
  Jonathan 

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On Tuesday, January 16, 2024, 3:36 PM, mott via People <people at lists.audioinjector.net> wrote:

   That's interesting, I hadn't realised that other players on the same local network would receive a recompressed signal. I may check this on the logitech forum. But no, both server and the player for my main stereo are on the same Pi and the sound will go direct to the card, not the network. 
  Is there no advantage in using the card that handles 192kHz, even though it's connect to unbalanced inputs? 
  Iain 

   Enviado do meu Galaxy  

    -------- Mensagem original -------- De : jr52884 <jr52884 at aim.com>  Data: 16/01/2024 17:16 (GMT-03:00)  Para: mott <mott at escuta.org>, people at lists.audioinjector.net  Assunto: Re: [AudioI] FW: Re: Audio Pro Soundcard for Tidal streaming  
     Hi Iain, 
  I thought you wanted differential audio output from the Pro. Do you just want single-ended (unbalanced) then? If so, you would buy the RCA preamp board for the Pro instead.  
  You mentioned you are using a high fidelity streaming service. Will you be running it on the Pi itself or streaming the audio output of what you are running it on over the network to the Pi? If the latter is the case, you’ll be recompressing the streaming service’s audio to deliver it to the Pi over the network and losing quality. I don’t know if it will resample it, but if it does, you would be defeating your initial goal. 
  Jonathan 

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On Tuesday, January 16, 2024, 1:27 PM, mott <mott at escuta.org> wrote:

   That's great Jonathan. The preamp is a Quad 34 with unbalanced inputs (rca). I'm guessing the output of XLR board will be better than the earlier Audio Injector Stereo (at least when playing 192kHz 24bit audio), but in any case, I need an additional quality output board for the Pi, and it'll be handy have a balanced interface for other things. I'll wire up or purchase a short XLR to RCA lead to connect to the Quad.

 Logitech Media Server is an excellent streaming audio server for Spotify, Tidal, web radio, etc. It can stream to any number of players (including squeezelite) on a network and these players can be controlled from mobile phone apps or a browser interface. 

 All the best,

 Iain 

   Enviado do meu Galaxy  

    -------- Mensagem original -------- De : jr52884 <jr52884 at aim.com>  Data: 16/01/2024 13:58 (GMT-03:00)  Para: mott at escuta.org, people at lists.audioinjector.net  Assunto: Re: [AudioI] FW: Re: Audio Pro Soundcard for Tidal streaming  
     Hi Iain, 
  I don’t know what sort of input connections your preamp has (I don’t believe you mentioned it) and I’m not familiar with any of that software.  
  The Pro simply presents itself as an ALSA device, like any other ALSA soundcard. If you require differential audio output for your preamp, you’ll get it with the XLR preamp board via the XLR connectors.

 Jonathan

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On Tuesday, January 16, 2024, 5:25 AM, Iain Mott <mott at escuta.org> wrote:

Thanks Jonathan,

I think the description "Audio Injector XLR Preamp - Professional-Grade Audio Interface for Microphones and XLR-Based Audio Sources", confused me a little. I didn't initially assume that it had outputs.

My Pi with have the Logitech Media Server running and additionally, squeezelite, to play from the server and send audio to the outputs of the "Audio Injector XLR Preamp".

If that sounds correct I'll place my order for the Pre-amp.

All the best,

Iain

 Em 15/01/2024 17:13, jr52884 at aim.com escreveu:

      Iain, 
  The XLR preamp board provides both stereo input and output and is how you interface the Pro with whatever you connect it to. If you want differential audio output, that's the preamp board you buy. If you want single-ended audio like the Stereo provides, you buy the RCA preamp board. 
  The XLR/RCA preamp board provides the analog preamp stage that interfaces with the CODEC's inputs/outputs used on the Pro. 
  Jonathan 

      On Monday, January 15, 2024, 11:45:29 AM EST, mott via People <people at lists.audioinjector.net> wrote:  

   Enviado do meu Galaxy  

   -------- Mensagem original -------- De : mott <mott at escuta.org>  Data: 15/01/2024 12:25 (GMT-03:00)  Para: jr52884 <jr52884 at aim.com>  Assunto: Re: [AudioI] Audio Pro Soundcard for Tidal streaming  
   Hi Jonathan, 
  So the XLR preamp acts as a complete stereo interface, with stereo output independent of any input?  
  Iain 

   Enviado do meu Galaxy  

  -------- Mensagem original -------- De : jr52884 <jr52884 at aim.com>  Data: 15/01/2024 11:47 (GMT-03:00)  Para: mott <mott at escuta.org>, people at lists.audioinjector.net  Assunto: Re: [AudioI] Audio Pro Soundcard for Tidal streaming  
   Hi Iain, 
  You simply buy the Audio Injector Pro and the XLR preamp board and use XLR to connect unbalanced audio to your preamp like you would anything else.  
  The preamp board is needed unless you want to roll your own high quality op amp line drivers. The CODEC requires them.  
  Jonathan

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On Sunday, January 14, 2024, 12:20 PM, mott via People <people at lists.audioinjector.net> wrote:

   Thanks Jonathan. No, sorry, I should have explained better. I currently have a raspberry pi with a stereo audio injector card. It's connected to a Quad 43 preamplifier and I use it for streaming Tidal. My turntable is also connected to the Quad and I want keep using the preamp. I'm interested in using the Pro audioinjector to make use of its processing of higher sampling rates, specifically, for Tidal's high resolution content, some of which streams at 192kHz. So I need to know how to wire its output to connect with the unbalanced inputs of the Quad 43. 
  Iain 

   Enviado do meu Galaxy  

    -------- Mensagem original -------- De : jr52884 at aim.com  Data: 14/01/2024 13:27 (GMT-03:00)  Para: mott <mott at escuta.org>  Assunto: Re: [AudioI] Audio Pro Soundcard for Tidal streaming  
    Ian, 
  There are output boards available, both single-ended (rca preamp) and differential (XLR preamp) boards. It sounds like you have the RCA preamp board. You would simply buy the differential preamp board. Here is the product page and it looks like you can purchase it here. 

  Jonathan

      On Saturday, January 13, 2024, 11:24:28 AM EST, mott via People <people at lists.audioinjector.net> wrote:  

     Actually, what I wrote is probably wrong, at least, if the diagram really does apply to the Pro. 

  Output 4 is Left out +ve and Output 3 is Right +ve, for balanced, I assume. 

   Enviado do meu Galaxy  

    -------- Mensagem original -------- De : Iain Mott via People <people at lists.audioinjector.net>  Data: 13/01/2024 11:38 (GMT-03:00)  Para: Holguin Daniel <cicloide at yahoo.com>, people at lists.audioinjector.net  Assunto: Re: [AudioI] Audio Pro Soundcard for Tidal streaming  

Thanks Fausto! 

I saw this diagram on github:

So I'd wire the left channel RCA "tip" to Output 1 and the right channel tip to Output 2. Correct? Do the Output pins have a ground or should I wire the RCA sleeves to the GND on the Power pins?

Iain 

 Em 13/01/2024 09:21, Holguin Daniel escreveu:

 Hi Iain. 
  Yes. The first two channels are at the left. The left channel on top. Usually. 
  The card can output stereo. 
  Fausto

 sent from a📱  

  On Sat, Jan 13, 2024 at 5:01, Iain Mott via People <people at lists.audioinjector.net> wrote:   Hi,

  I'm interested in using the new Audio Pro Soundcard for streaming Tidal 
  with a high resolution account (audio of up to 192kHz, 24bit). For this 
  I'll be needing only unbalanced audio output from the card to connect to 
  a stereo pre-amp and power amp.

  How should I go about making the audio connections for this, please? Is 
  it just a matter of connecting a pair of RCA sockets to certain pins on 
  the "OUT" section of the board?

  For my system, the Raspberry with the Pro Soundcard will be running a 
  Logitech Media Server with a Squeezelite audio player.

  Thanks a lot,

  Iain

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