Mailinglist Archive: opensuse (3637 mails)

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Re: [SLE] {OT} Mixing audio from 2 SuSE systems into 1 speaker system
On Wednesday 09 May 2001 22:14, you wrote:
> Hello to all, sorry to be OT, but thought that these
> lists might have someone that knows how to:
>
> Combine the audio outputs of 2 different SuSE Linux
> 7.1 PCs into an amplified speaker system?

Well, on this (off) topic at least, I can speak with *some* confidence :)

> I have tried using a simple Y-adapter on the speaker
> (Yamaha) input but this causes a lot of HUM and
> seems to have burned out one sound card! Has anyone
> done this?
>

<blabla>
Not excactly, and you really shouldn't (you might burn out a card or
something ;-)

I'm not going to go into the electrics of it (I never took BOE101) but in my
experience (years of sound engineering) it's not a good idea to just join two
line outputs with a Y-adapter. Results are rarely very nice.
</blabla>

Depending on your setup/purpose you basically have two (well maybe three or
four) options:

1: As Jonathan Wilson suggested connect [lineout box a] to [linein box b] and
then [lineout box b] to [amp]

2: Get some external mixing device a la:
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTL
G%5F002%5F003%5F001%5F000&product%5Fid=32%2D1106&MSCSProfile=745D84CBF04D14A48
AA6FF9C89D722C036698F129F4C93D891A07105F1015CEB4C6BCD8DEC5AE5EA7D4B5B52C206DE0
252D40EE138DC7ADEBA9825156639A336445A36ECC7EE549809D97E519522AA5AA9C61D0B769C1
D9573B591410AC7F8C35AA34C61EA54B621DCB4F641FC9FBB972DDCCCFFE249BB3371F0E81F1774BDBC48F8831C5B28E4C1

(incase this link doesn't work: radioshack.com > Tv/Audio/Video > Pro Sound >
Mixers > Cat#: 32-1106)

3: As Harry G suggested: Use an A B switch

4: Same as 2, but get a kit, and assemble it yourself...

Comments:

1: Probably the easiest (well cheapest anyway) solution. You then only need
to set volumes on [box b]'s internal mixer. The drawback is that [box b] ends
up being the "master", meaning that sound from [box a] only gets to the [amp]
when [box b] is up and running.

2: Is what I would prefer: You'd end up being able to get sound from either
box to the amp independantly. This also is less complicated if the situation
involves gaming, where an internal mixer might be difficult to get at. (?)
The drawback here is that $50 is a bit steep, but you may be able to find
something cheaper... (the mixer shown has four stereo ins, while you need
only two)

3: Basically the same as 2, only you only get _one_ soundsource to the amp,
at a time. (Since you wrote 'combining' I'd hazard a guess that this is not
what you're after)

4: Maybe cheaper, if you're up for soldering and such...(?)

Regardless of which solution you choose, make sure to use shielded cable.
Also you might want to run a separate ground between the two boxes (and the
amp). This might a: remove/reduce hum/noise b: reduce the risk of toasting
cards in the event of powersurges and the like...

Hope this helps

Jon Clausen

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