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Chameleon Labs 7720 Stereo Compressor querrie

Discussion in 'Electronic Repair Modifications DIY' started by boxcar, Apr 28, 2010.

  1. boxcar

    boxcar Active Member

    im thinking of buying one of these 7720's for my mix bus but it only has XLR's in/out.
    my zed r16 has 1/4 trs inserts.
    would it work o.k. if i make insert cables with a trs jack to two XLR jacks(one male/one female) and patched it in with that or would that be noisy in any way.it wouldn't be balanced but my other compressors with 1/4 jacks are not balanced either, when using insert cables and they are not noisy.
    just wondering about XLR to TRS insert cables though.
    any thoughts? special(ground) wireing method? thanks
     
  2. TheJackAttack

    TheJackAttack Distinguished Member

    Plug not jack. A jack generally refers to either a panel mount or similar connection point. Or me. You could certainly make an insert cable from a 1/4" TRS phone plug going to two XLR male plugs (minus pin 1). Follow the chart schema here.

    Noise will depend on your grounding scheme. Short runs shouldn't be a problem provided the gear itself is grounded properly and powered via the same circuit.
     
  3. boxcar

    boxcar Active Member

    plug not jack... momentary lapse of reason.lol

    great, thanks for that, they're only 3 footers and my rig is well grounded and quiet.
    thanks for the chart.
    let the buying and soldering begin.
     
  4. TheJackAttack

    TheJackAttack Distinguished Member

    Speaking of momentary lapse......I looked at your device and while you should be able to figure something out it was not designed to be used as an insert device. It was designed to be used balanced on the 2-bus outputs.

    Now, here is the crux of the issue. If the 7720 is truly looking for a balanced signal then you will lose significant signal by unbalancing the connection. Also, I've decided it probably isn't a good idea to share the sleeve on pin3. If Boswell chimes in here he can give you the why and wherefor of the deal. If I were going to use this compressor as an "insert" then I would send from an aux bus or something via balanced line and then return it to a pair of new channels or aux bus.
     
  5. boxcar

    boxcar Active Member

    yeah, i think given that issue, i will look for something else with XLR and1/4" in/out as i wouldn't want to give up two channels and the only XLR outs are the mains.
    would you(or anyone else) have a recomendation for a mix bus compressor that sounds SSL'ish (not colored) under $800. i know that's not easy to do, the 7720 was well liked for that as far as i can reserch but that sounds impractical now.i could go for any compressor that would do something similar.i like the drawmer 1968 too but i don't want to spend $12 to $1400 right now.
     
  6. TheJackAttack

    TheJackAttack Distinguished Member

    ebait often has Ashly 2 channel compressors that might fit the bill.
     
  7. TheJackAttack

    TheJackAttack Distinguished Member

    You must be able to do what you want with the Chameleon. The ART Pro VLA II which was my other suggestion also utilizes balanced in/out and states that it can be used as an insert. It also has TRS jacks in addition to XLR jacks.
     
  8. boxcar

    boxcar Active Member

    i have an pro vla 2 with mullard tubes that im using for the mix bus now, it's not bad. it's great for kick and bass guitar.
    and i have a dbx 1066 that i use for live vocals and other gate/sqashing situations.
    im looking to add a transparent glue to the mix bus without spending $2000..lol
     
  9. TheJackAttack

    TheJackAttack Distinguished Member

    Well, you could change the tubes on the VLA to a less colored flavor...

    or take a look at the Ashly stuff.
     
  10. boxcar

    boxcar Active Member

    yeah, i tried the stock rubys for awhile and JJ's but i think the vla is a little heavy footed for the mix bus but nowhere near as much as the dbx.
    i'll check outt the ashly stuff.
     
  11. boxcar

    boxcar Active Member

    John, just wanted to thank you for making me aware of the Ashly compressors.i read up on them and i got the CLX 52. $269(a steal)
    i had heard of ashly for power amps and p.a. stuff but i didn't know they made comps.
    im still looking for a recording bus comp. but i have that thing on the live practice p.a. inserts and it really glues us together when we jam.
    its that detection circuit(stereo tie) unlike the pro vla or the dbx where channel 1 controls both sides,
    with the ashly circuit, both sides are active and the circuit equalizes both channels according to which one's being more compressed.
    it really does result in a more balanced stereo image.i'll try it for tracking next.
    nicely built too,tight knobs,solid face plate and i like the fact that its made in north america.
    anyway i love it, its cool..thanks
     
  12. TheJackAttack

    TheJackAttack Distinguished Member

    You're welcome. Let us know what you come up with for the recording bus.
     
  13. boxcar

    boxcar Active Member

    i don't know what to do about that one.
    what i really want is the API 2500 or the SMART C2 but $2500...gulp!
    maybe i'll find one at a yard sale.lol

    *still looking for realistic sugestions though if anyone has any.
     
  14. boxcar

    boxcar Active Member

    i just ordered a drawmer 1968 ME.
    should have it soon,i think that will be just the ticket.
    will post again after i've had it a couple of weeks.
     
  15. TheJackAttack

    TheJackAttack Distinguished Member

    Nice. Drawmer generally makes some good gear.
     
  16. boxcar

    boxcar Active Member

    Drawmer 1968 ME...WOW!

    Granted, i haven't heard any of the other more expensive ones like the API 2500, SMART C2 and the likes but this thing is smooth.
    For someone who wants just a bit of glue and slight tube color on the mix bus and something simple to use, this thing is worth the money all day long. IMO.
    You can push it pretty hard to without dulling the mix.

    If anyone is sitting on the fence about bus compression like i was,this is a good jump to make at $1500.
    Thanks for all the posts, it worked out nicely.
     

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