Passive Split Madi BNC with a "T"

[Miramar_sessions]

Hi, does anyone tryed to passive split a madi signal with a BNC "t"?

I've a live recording to do. I always multitrack record the live concerts for this band from the FOH digico SD8, with the MADI B output to a laptop with an RME MADIFACE, and have great results.

But this time, its more serious stuff (a DVD recording), and i'll need two systems recording at the same time (redundancy). Can i split the SD8 B output with a BNC "T", and feed both systems with that signal? I'm talking about 1 or two meter cables.

If anyone tryed this, i would apreciatte an answer!

Thanks

[huub]

Well, I've seen SDI video, AES and wordclock work with T or Y splitters, so I assume MADI could work... Extremely risky and unwise, but it might work fine....
This was a creative solution to distribute pal video without VDA..

[klaukholm]

I would be very careful about that.
Get the direct out splitter instead.

[Miramar_sessions]

Thank you folks,

i just realized that the Digico SD8 has an extra paralell output that i can use to record on two systems. So no need extra splitters.

Cheers,

JB

[klaukholm]

That is good news for you!

[JonesH]

My gut reaction would be this as well. It does work for wordclock and aes though, but is the added bandwidth of madi the reason that you distrust it?

[huub]

Well, splitting AES is sketchy too.. It works, but I've had random clicks whilst running it parallel, so it's a risk always..

[klaukholm]

Madi was never designed to be split with t connectors, so all inputs are terminated.

[JonesH]

Originally Posted by klaukholm

Madi was never designed to be split with t connectors, so all inputs are terminated.

Thanks, didn't know that.

[charlienyc]

Originally Posted by klaukholm

I would be very careful about that.
Get the direct out splitter instead.

you can find further info about the SPLIT.CONVERTER on the d.o. tec website below, in case anyone's looking for it. the site is not the easiest to find, imo:
D.O. TEC SPLIT.CONVERTER

cheers,
-c

[mpdonahue]

If you're looking at MADI routers, I'd take a look at the new MADI-X8 router. It isan 8x8 MADI router that is actually a 512x512 crosspoint. It allows different framing formats to be combined and aggregated into a single MADI stream.
I've got one here for a Beta test and it is a VERY powerful box. The software to control it is still in need of some UI tweaks, but it does what it says it does.
The price is about the same as the DO or RME routers, but offers SOOOO much more.

All the best,
-mark

[charlienyc]

Originally Posted by mpdonahue

The price is about the same as the DO or RME routers, but offers SOOOO much more.

this does seem like a great box. however at £2250 excl. VAT (street $3900), it's not the same price as the RME MADI Bridge ($1999) or the d.o. tec (€990 or ~$1390). it's a matter of different tiers for different functionality.

the d.o. tec SPLIT.CONVERTER is what i'm getting for now, assuming my friend can flag down the d.o. tec guys at AES this weekend!

[londonengineer]

I have had great results splitting the MADI TX Stream with a T-Piece, also with short cable runs.

[mpdonahue]

Yea, The original price they were talking about when I got the unit for Beta was $2599, but they obviously have been hit hard by the change in the pound/dollar exchange rate.
The DO is a very well made box, and if 4x4 is enough for you then it is a great tool for the job. We have 3 of them for our road systems, along with a pair of sample rate converters.
The big deal about the SSL is the ability to aggregate several sources of differing formats (Smux, 96k Frame, 56 or 64 channel) into a single output, allowing for multiple converters to be reduced down into a single record stream.
All the best,
-mark