Re: HELP! Audio Matching Question
- From: "blackburst@xxxxxxx" <blackburst@xxxxxxx>
- Date: 14 Oct 2005 07:38:09 -0700
Richard Crowley wrote:
> blackburst wrote ...
> >I am rebuilding a small TV production truck. I need to take the video
> > output from the production switcher and the audio output from an audio
> > mixer and send them to various places. So I am looking for a
> > video/audio distribution amplifier (DA). In this post, I am trying to
> > match the audio mixer to the DA.
> >
> > The mixer is a Behringer SL3242FX. The stereo outputs include:
> > 1) XLR, approx. 240 ohm balanced/120 ohm unbalanced, max out level +28
> > dBu
> > 2) 1/4", approx 240 ohm balanced/120 ohm unbalanced, max out level +28
> > dBu
> > 3) RCA, approx 1 kilohm, max out level +22 dBu
> >
> > Virtually all of the video/audio DAs have RCA inputs and outputs. (And
> > most of the units connected to the DA outputs will also have RCA
> > inputs). Here's my question:
> >
> > Can I send the Behringer 1/4" outputs (#2 above) to the RCA inputs of
> > the DA? Or do I have to use the RCA outputs of the Behringer?
>
> What are the specs on your DAs?
I don't know. That's why I'm considering several models, mostly Ocean
Matrix and Kramer, via TechNec and Comprehensive.
> Will they take +28 (or even +22) dBu? In? Out?
Nearly ALL of these things are RCA, and presumably -10.
> What are the specs for the destination equipment?
Again, mostly RCA -10. Such as Sony DSR-45 DVCAM deck, Sony DVD
recorder, cassette recorder, and a feed to an amplifier/speakers.
> Same question about levels?
>
> RCA line level frequently implies something more like -10dBu
> working levels. (Applies to both the DA and the destination
> equipment.) The Behringer manual doesn't appear to specify
> the "working" or "design" levels for their outputs, only the max
> levels. And there is no gain plot either, so it isn't clear what they
> intended the "nominal" level of those outputs to be.
I'm just looking to see if an RCA device might have enough headroom to
accomodate the Behringer levels. (I'd call the manufacturer, but Ocean
Matrix doesn't answer the phone, and Kramer is in Jerusalem.
>
> You may need to use a simple pad between the 1/4"outputs of
> the Behringer mixer and the inputs of your DAs to knock the
> level down to -10dBu (or whatever they need).
>
> Note that the "CD/Tape Output" RCA connectors on that mixer
> appear to be "pre master" which may not be what you need for
> your configuration. It would be confusing to many operators to
> find the master faders non-functional.
Really? I thought the RCAs were responsive to the master fader.
>
> What is the distance between the mixer and the DAs?
Less than 10 ft.
Does audio
> RCA out from the DAs imply that you are running unbalanced
> audio through the truck?
It's currently a mishmash with Shure mono M-267s, with outputs split!
Have you already established that this
> practice (running lots of long unbalanced audio lines through a
> video truck) isn't going to be a problem?
I did a similar truck with a Mackie 1604VLZ and a Sigma DA, and it is
fine, except within 100 feet of the local AM station.
.
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