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Multiple digital inputs to sound equipment ?

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Multiple digital inputs to sound equipment ?

Postby SteveT » Wed Apr 23, 2014 11:01 pm

Given that all my electronic sound sources have S/PDIF outputs now, why can't I find a soundcard or mixer with multiple digital inputs to accommodate them all in the digital domain? Is it an issue still of processing power? I find that hard to believe these days.
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Re: Multiple digital inputs to sound equipment ?

Postby Hugh Robjohns » Wed Apr 23, 2014 11:10 pm

It's not a function that most home studios need, so its not something that general interfaces offer... but most decent digital mixers can be configured for multiple aes3 inputs which will accept spdif without much fuss.

The Roland m1000 is a USB interface with multiple spdif inputs, and possibly the best fit for your needs.

http://www.soundonsound.com/sos/jun03/a ... dm1000.asp

http://www.roland.com/products/en/M-1000/

Alternatively, most interfaces have ADAT inputs, and there are aes3 to ADAT converters -- something like the rme adi8.

Bear in mind that to use multiple spdif sources together you'll need either to clock them from the same master clock, or use an inteface or mixer with asynchronous or SRC inputs (such as the m1000)

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Re: Multiple digital inputs to sound equipment ?

Postby John Reid » Thu Apr 24, 2014 10:12 pm

The bigger problem is that, although lots of gear has S/PDIF out, most of it won't have any digital input so you won't be able to sync it in the first place; the only solution then is to use something with SRC inputs as Hugh suggests, in which case I'd sooner use the line outs directly into an audio interface.
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Re: Multiple digital inputs to sound equipment ?

Postby Dave Blackman » Fri Apr 25, 2014 8:57 am

As mentioned, clocking a system like this will be the hard part - don't know what you're using but a lot of budget gear lack a sync input.

I use a Rosendahl Nanosyncs to get all my gear singing from the same hymn sheet.

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Re: Multiple digital inputs to sound equipment ?

Postby Hugh Robjohns » Fri Apr 25, 2014 9:27 am

Both the Roland M1000 and the RME ADI-8 have asynchronous sample rate converters on the digital inputs, to it doesn't matter if your sources can not be clocked externally.

And modern hardware SRCs outperform all current D-A and A-D converters in all the important ways, so there is no problem going down that route if it suits what you're trying to achieve...

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Re: Multiple digital inputs to sound equipment ?

Postby Goddard » Fri Apr 25, 2014 3:15 pm

Fwiw, Lynx offer "SRC" versions of the their AES16 and AES16e cards which can interface multiple S/PDIF inputs to a computer.

And Friend-Chip offer modular digital format conversion systems with SRC available on some modules, if one wants to convert multiple S/PDIF inputs into an ADAT output.

As for multiple digital inputs on sound cards and mixers, such has been common for many years, at least since the days of digital 8-track decks and mixers with ADAT and TDIF and 8-ch AES3 connections.
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