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BNC 75ohm Cable Mixing..... Modular Synthesizers
Old 9th September 2011
  #1
Gear Nut
 
chriscasino's Avatar
 

BNC 75ohm Cable Mixing.....

Hiya!!

Ok...this post is in regards to the connection of 3 pieces of MADI equpped gear (Sony DMX-R100, Euphonix R1 604 MADI Router & RME HDSPe MADI card inside of my MacPro) which are clocked to a gen-X96.

I have several brands of digital BNC 75ohm "4.5 Ghz HD" cables (that came from my jobby job: 8 or more from Belden for the R1 stuff, several from Gepco going to my clock) And 5 CANARE (that just say 75ohm on the jackets, going to/from the sony and rme madi card) that I bought from *gasp* Sam Ash...I needed a 6th one (15ft) to complete my cables, but they were out...so I used a spare Gepco (75ohm 4.5ghz) running from the sony to the r1 madi router to get me playing - and sound was slightly more defined on the high end (opposed to "fuller and richer" on the low end)..my question is WHO IS FAMILAR with ANY of these cables and what do you think of them? DOES THE 4.5 ghz thing matter in reference to didgital audio? (Who is the "lesser" brand out of my 3...)


OH! and I am monitoring the signal with x2 JBL 4328's & 4312sp Sub (via AES/EBU - Mogami cables...Mogami snakes and Canare XLRs on everything else in my studio) in an untreated room (it will be very soon....)

I know that it's ALL subjective to alot (ie: my tastes, ear health, material, etc.) but WHO MAKES THE BEST CABLES OUT OF THE 3 IN QUESTION? Should I just order the 6th Canare and shut up "cuz it really dont matter"? Am I tweaking? Or is this "4.5 ghz - affecting my audio thing" real?

I'm sleepy now....it's kinda overwhelming my brain.
Old 9th September 2011
  #2
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hasbeen's Avatar
Quote:
Originally Posted by chriscasino View Post
Am I tweaking? Or is this "4.5 ghz - affecting my audio thing" real?
I would like to tell you that I have used several different brands of well made BNC 75ohm of varying lengths (up to 12ft) for clocking, and there is no difference what so ever. But then there would be a pig pile of people who paid $750 for a BNC cable on my back.
Old 9th September 2011
  #3
Gear Nut
 
chriscasino's Avatar
 

I found that the belden and canare cables sound exactly alike....it's that damn Gepco that is giving me fits!

I know what you mean about the "pile-up" - it's wack. (Kinda like "Political" infighting and deadlock...it doesnt really help anything or any situation...just makes folks feel good about dumping on one's opinion, and the others, mildly annoyed at the verbal hamster-wheel of trying to "prove" one's opinion is law or fact.
Old 9th September 2011
  #4
Gear Maniac
 

Hi,

MADI works at a higher frequency than usual audio signals or clocking, thus a cable with optimal transmission on higher frequency rates than wordclock should be used.

A good simil is AES/EBU over analog cables. Does it "work"? Yes. Is it optimal? No.

So on my wirings i always use HD Video rated cable on MADI lines which is what should be done.

Hope to help you out.
Old 9th September 2011
  #5
Gear Nut
 
chriscasino's Avatar
 

Thx for the replies...

with that said, is the following (Canare) HD video rated? (I think this is the wire used in the cables I bought from Sam Ass)

Canare Corp.: 75 ohm Coaxial Cable: 75 ohm video coaxial Cable(LV-61S)

Doesnt say so on the jacket...but it sounds good: The belden and gepco have HD, 4.5 ghz written all over the wire jackets...
Old 9th September 2011
  #6
Gear Maniac
 

Hi Chris,

This Canare you mention looks like good SD video cable but it's not suitable for HD if you look at the specs further down on the page. I would go for the HD-SDI cable for MADI runs, the one you say it says 4.5 on the jacket.

I'm sorry i don't have experience neither with the Canare or Gepco line, as these cables are not really popular in this side of the ocean....
Old 9th September 2011
  #7
Gear Nut
 
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Ok...so Looks like I have enuf 4.5 ghz HD cable to cover all of my MADI connections, if I switch the existing canare ones (in the url) to JUST the wordclock feeds.....

So should I then try to buy a matching 4.5 ghz gepco one? Or can I use the 4.5 ghz hd belden (my only other 15' cable, but mixed brand-wise = totally bothering my OCD ) Is "4.5ghz / HD" all the same at that level.......?
Old 9th September 2011
  #8
Gear Maniac
 

If everything is 4.5 HD Video there should be no major differences. It means it can transmit optimally up to that rate, so you will be safe.

On the other hand i have the rule of using always the same brand for all wirings at one place... when regarding analog signals.

But up to this level, being all 4.5 HD video cable and MADI signals... i would sleep without problems.
Old 9th September 2011
  #9
Gear Nut
 
chriscasino's Avatar
 

Quote:
Originally Posted by Adria_BCN View Post
If everything is 4.5 HD Video there should be no major differences. It means it can transmit optimally up to that rate, so you will be safe.

On the other hand i have the rule of using always the same brand for all wirings at one place... when regarding analog signals.

But up to this level, being all 4.5 HD video cable and MADI signals... i would sleep without problems.

Oh-to-the-Kay! I wont worry then!
Old 9th September 2011
  #10
Gear Nut
 
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THANKS!!!
Old 9th September 2011
  #11
IM_
Gear Head
 
IM_'s Avatar
Try a factory-terminated Van Den Hul Digicoupler. It's a Great (!!!) 75 ohm buddy and is pretty affordable (not $750)
Old 9th September 2011
  #12
Gear Maniac
 

Quote:
Originally Posted by IM_ View Post
Try a factory-terminated Van Den Hul Digicoupler. It's a Great (!!!) 75 ohm buddy and is pretty affordable (not $750)
Van Del Hul is a good Hi-End for SPDIF, but certainly not made for MADI or Pro use.

Good MADI capable cable costs arround 1,5€/Meter.
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