trawson
Posts: 2
Joined: Sun Nov 12, 2017 10:35 pm

Improving audio quality

Sun Nov 12, 2017 10:49 pm

Hi all ...

I'm an old hand with computers but new to Pi. Current setup I'm testing is a Pi3 running MusicBox to drive a set of speakers in the kitchen. This is sort of proof of concept and if it works I will put more Pis and speakers around the house. This is just for streaming in each room, not trying (yet) to sync the rooms.

So I have the Pi3 all set up and I have been testing it with a tiny amount of content from NAS plus some via Airplay,. It all works but the noise level -- crackle, hiss, hum -- out of the speakers is bad, especially when nothing is playing. I know the current setup is not well-done but I'm not sure which issue to address first. Here are the questions:

  • Power supply -- do I need an EMI filtered supply? They seem pretty expensive.
  • Alternatively, are there in-line filters available for the USB power cable? I know I can build my own with capacitors and choke but I would rather have something packaged.
  • How much of the noise is likely to be due to using the on-board audio? I plan to add a DAC and I have a pimoroni PhatDAC here, but haven't installed it yet.
  • Any other suggestions?
Thanks for any help!

Tom

hitsware
Posts: 53
Joined: Sat Mar 26, 2016 10:12 pm

Re: Improving audio quality

Tue Nov 14, 2017 5:41 pm

If your ' phatdac ' has anywhere near the affect
as a ' hifiberry ' , you will jump up for happy !

FM81
Posts: 515
Joined: Wed Apr 17, 2013 4:33 pm

Re: Improving audio quality

Tue Nov 14, 2017 6:34 pm

If you mean this https://shop.pimoroni.com/products/phat-dac - yes, it has the same chip as the first hifiberry (over years lots of other versions was added) and there should be no significant difference in quality. It simply sounds good. But be aware that it is line-out-level only, means for driving speakers is an additional amplifier needed.

Greetings, FM_81
A: What does the command 'cat /dev/urandom', can you tell me please?
B: Yeah, that's very simple: It feeds your cat with radioactive material!

trawson
Posts: 2
Joined: Sun Nov 12, 2017 10:35 pm

Re: Improving audio quality

Tue Nov 14, 2017 10:54 pm

Thanks ... I believe that is the same board I have.

Do I need to do anything to filter the USB power?

FM81
Posts: 515
Joined: Wed Apr 17, 2013 4:33 pm

Re: Improving audio quality

Fri Nov 17, 2017 10:43 am

I assume NO! I've never needed such kind of filtering on my projects. But avoid ground-loops where ever you can ...

Greetings, FM_81
A: What does the command 'cat /dev/urandom', can you tell me please?
B: Yeah, that's very simple: It feeds your cat with radioactive material!

Return to “Graphics, sound and multimedia”

Who is online

Users browsing this forum: No registered users and 17 guests