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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

RED XLR > MiniQ

Oz Lensman said:
I'm planning to tether four Samson wireless microphone receivers (mini-XLR outputs on all of them) to my Red One, so this is important info. I won't be using phantom power, so does anyone know if the new RED XLR-to-mini-XLR cable adaptor (single cable with integrated adaptor) affects a non-phantom audio feed into the camera?
Click to expand...

Yes, these adapter cables provide a number of features. If you plan on connecting your Samson wireless receivers directly to your RED ONE without using the RED supplied adapter cables, there are a few things that you should realize.

First, it is essential that you do not activate phantom power in the camera for any of the channels.

Second, without the cables, the Fs (clipping point) for the camera will be 2V RMS (+6 dBV or +4 dBU) as opposed to 6.6V RMS (+16 dBV or +14 dBU).

A 2 Volt clipping point is fine for most consumer line level signals, but you run the risk of clipping with many professional level signals.

If your Samson's offer output level adjustments, and you configure it so that you do not clip the converters in the camera, you are safe to proceed, but the warning not to activate phantom mode still applies.

Kevin Halverson
 
http://www.trewaudio.com/audioflow/2008/03/12/are-you-redy/

"The internet has provided a lot of information on the topic of audio for the RED. A few users have confirmed my suspicions, and rewritten the manual before RED could. On some select cameras the TA3 inputs may be out of phase. This could be an issue with the mislabeling of the connector graphic in the manual; either an internal mistake in the camera, or the cable was made to the graphic and not the chart. Beware."
 
Thanks for your reply khmus. I'll be getting 6 of the Red mini-XLR to XLR cables (2 spares, just in case) so I should be okay. The Samsons have a switch for three different levels of output from the receiver to the camera (no phantom required), so I'll experiment with various settings and cable arrangements to find the combo that best avoids audio clipping. Cheers!
 
Could someone at RED please fix the TA3 diagram on page 59 of the RED manual.
As of build 15 (2.1.4) it still incorrectly shows an XLR3 connector instead of a TA3.
This is confusing A LOT of people!

Here is a grab from the latest version of the manual:
RED.png


The connector on the RED camera is a TA3 which has Pin 2 in the bottom and pin 3 next to pin 1.
The thing is that when people see this diagram they will wire their cables with the wrong phase.
 
I'm giving this thread a bump because, although sound is not my department, as a camera owner I want to have the right tools available for the mixers that I work with.
Sooooooo.... anyone from the Red Team going to chime in here? It seems as though, if we want "-20" from a pro mixer to be "-20" on our cameras we need "pads" built into our adapter cables.
Is this true?
Is Coffey sound or another vendor making these? I already have a set of pass-though adapters.
I just want to have the sound guy love my Red as much as I do!
Cheers,
Harry
 
harryclark said:
I'm giving this thread a bump because, although sound is not my department, as a camera owner I want to have the right tools available for the mixers that I work with.
Sooooooo.... anyone from the Red Team going to chime in here? It seems as though, if we want "-20" from a pro mixer to be "-20" on our cameras we need "pads" built into our adapter cables.
Is this true?
Is Coffey sound or another vendor making these? I already have a set of pass-though adapters.
I just want to have the sound guy love my Red as much as I do!
Cheers,
Harry
Click to expand...

Harry, I'll be happy to exchange your original cables for the new ones with the pad.

I can send when I send F's cables out.
 
Oh hi Wes...
I was thinking it would be useful to have both. I'll email you cause I need some other cables anyway...
Cheers,
H.
 
200K resistor is for bleeding of the 48v phantom power. I experienced it myself when checking phantom power polarity. After I disabled the phantom power, the 48V was staying there for a long time.
610 ohm resistor is for protecting the camera input I think.
Most mikes with phantom power have large capacitor across the 48V supply lines.
When you connect such mike fully charged to the camera that is fully discharged or vice versa then you are asking for trouble. Just unplugging it from one channel and plugging it in to the other fully discharged channel will bring some peak currents, if not on the mike then on the camera. Mikes are protected though very well so the camera is getting all the current spikes.
Well, most engineers designing the audio equipment knows that stuff.
I guess this one didn’t research the subject well enough.

So we did end up with the extra circuitry in the RED-mike-cable that will be moved to the new revised version of the audio board.

Anybody blew up the audio channel on the camera lately?
 
Priorities and again priorities. What do you want to be fixed first REDCINE or audio?
Audio will take it turn one day.................

I would love to have a list of features/projects that are concerning the RED and let people to vote what comes first. Well again I may not like the outcome anyway and you are removing the element of surprise.

Maybe that is why we do not know our future, if we did, life would be boring
 
I built today a cable regarding the resistor array what anders posted. Sent 0dB line signal in, and -24dB were recorded. Can't imagine that this will be correct. It was not possible to adjust the gain. Every setting I made had no effect. Probably the cam is waiting for a standard line signal if this is activated in the menu. Didn't tested the micro impedance setting.
Are there any news on the phase shift ?

thx
rainer
 
Audio

Audio

rainer said:
I built today a cable regarding the resistor array what anders posted. Sent 0dB line signal in, and -24dB were recorded.
Click to expand...

That is not correct. I will post more details on this subject shortly.

The polarity issue is under review, again more news very soon.
 
The resistors are 200K to bleed the 48V phantom power capacitor and 600 ohm one is to protect the RED input against the surges from mike side (phantom power mikes have its own capacitor)

So if your mixer has 600 ohm output impedance you will lose 6db, providing that RED has 600 ohm input impedance.
If you lost 24 then it looks like you have something like 10K ohm output impedance on your mixer?
Impossible, maybe you put 600 ohm across and 200K in line instead? But then you will loos more then 24.
Check your resistors and connections again.
Remember 200K across and 600 ohm in line.

But if you switched phantom power off on the camera side why do you need the resistors anyway?
Mixer doesn’t have any 48v coming out of it
 
Thx Stuart for the fast replay.

I will double check, but I measured it anyway, and think 680 Ohms in line and the 200k to ground. We used a 3channel Sounddevice output switched the 1k tone on and the meter said 0dB output.

OK... so we can make straight cables when we look to switch off the phantom power?

thx
rainer
 
But when you switch off the phantom power let it drain 48V for some time or connect cable with 200K accross to do it faster (1 minute)
My camera works great without phantom power, no hiss no noise.
With straight cable you will get slight boost of levels but you can corrct it in the line level setup.
 
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