H8000 Balanced to unbalanced cabling

This topic is empty.

Viewing 5 reply threads

Author

Posts
- August 12, 2008 at 7:21 am #105776
  
  krcassid
  Member
  
  Seems like a simple deal but I'm struggling with this one. Several of my applicataions with H8000 require me to use it in send/ return setup where preamp has unbalanced jacks (IE Mesa, Raven…). Inputting unbalanced sends into 1/4" analog inputs of 8000 works fine. But, returning balanced signal to unbalanced returns in preamp produces (not surprisingly) a ton of noise. Manual says to "unbalance XLR jacks by using pins 1 AND 3 as ground and 2 as hot". This leaves me with a couple questions:
  
  1.) On XLRF out from 8000, does this mean to use ONLY hot and shield (no – or black to Pin 3)? Or, do I leave XLRF as is normally wired and simply connect Pins 1 & 3?
  
  2.) On TRS end of cable into unbalanced return, what should be connected to what?
  
  Sorry: I'm no good with cabling. Thx for any help! Kevin
- August 12, 2008 at 10:22 am #117754
  
  IDeangelis
  Member
  
  Hi Kevin
  
  Eventides use XLRs for balanced AND unbalanced +4 dB line level signals OR 1/4" jacks for unbalanced -10/-20 dB instrument level.
  
  Mesa Boogie FX loops run at +4 dB, as a real fx loop should.
  
  Then you must use all XLRs on your H8000, keeping balnced the Eventide side of the cables and unbalancing the Mesa side.
  
  If you check our FAQ on the web site you'll find accurate documentation on how to wire these units. Have a qualified technician doing the job for you.
  
  All the best
  
  I
- August 22, 2008 at 1:37 am #117788
  
  krcassid
  Member
  
  OK, I've read the FAQ and about 10 different websites on how this should be wired (balanced to unbalanced). There are a variety of opiinions. But, accepting I's comments above and the wiring FAQ on this site, I have tried the following (which did not work):
  1.) Kept XLRF Out from 8000 wired as is (balanced)
  2.) Unbalanced TRS Input to my preamps (I have several) by attaching Pin 2 to Tip and combining Pins 1 & 3 to Sleeve (nothing to Ring).
  Result is: no signal from 8000 at all
  When using standard XLRF to TRS (balanced) into unbalanced return sends I get tons of noise, little signal.
  I'm not a cabling guy. Can somebody explain to me exactly how to wire a cable so I can use send/ retun from unbalanced Preamps? The Unbalanced TR send into the 8000 works fine into the 1/4" inputs. What I need to know is how to wire the FXLR out (From 8000) to the TRS jack at the other end so it vwill work with my preamps. I've been trying for two weeks and all I've got is soldering iron burns to show for it! Thanks in advance!
- August 22, 2008 at 3:45 am #128935
  
  IDeangelis
  Member
  
  You should *not* use TRS jacks on the unbalanced side! Just plain old 1/4" guitar jacks, Tip and Ground. Follow our tech note and it will work.
  
  -XLR connectors
  
  -BALANCED cable
  
  -1/4" Tip/Ground gtr jacks
  
  best
  
  I
- August 22, 2008 at 4:01 am #128936
  
  krcassid
  Member
  
  Ahhh! Faq does not really say anything about this. Since there are no XLR-TS cables, I was tring to work with XLR-TRS figuring the ring wouldn't matter.
  
  So, Leave the XLRF out of the 8000 alone, take Pin 2 to tip and 1+3 to sleeve of TS, right?
  
  Thx! I!
- August 22, 2008 at 7:51 am #128937
  IDeangelis
  Member
  It's obvious the tech note refers to guitar jacks. Why would you use a TRS (balanced connector) for an unbalanced wiring?
  
  Specifically, at the end of the technote, it says Tip and Ground!
  
  Here:
  
  H8000/8000A Series:
  - Pin 1 : GROUND
  - Pin 2 : +PHASE (Hot)
  - Pin 3 : -PHASE (Negative)
  Use
  line levels cables (2 connectors + Ground) as those made by pro audio
  companies like Mogami, Belden , Canare, Monster Cables, Klotz, etc.
  Always keep balanced the cables ends connected to the Eventide XLRs I/O
  and unbalance the ?? ends connected to unbalanced gear.
  - Input from unbalanced ?? jack:
    
    Connect XLR Pins #1 & #3 to ?? Ground
    
    Connect XLR Pin #2 to ?? Tip. If either pins #2 or #3 are unconnected, you will get more noise and hum than signal!
  - Output to unbalanced ?? jack:
  - Connect XLR Pin #1 to ?? Ground
  - Connect XLR Pin #2 to ?? Tip
  - Leave XLR Pin #3 unconnected
  I
Author

Posts

Viewing 5 reply threads

You must be logged in to reply to this topic.