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This topic comprises 2 pages: 1 2
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Author
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Topic: UltraStereo Problems
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Charles Lubner
Film Handler
Posts: 78
From: Milwaukee, WI USA
Registered: Sep 1999
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posted 12-25-1999 02:00 PM
I'm having sound problems with my UltraStero unit. It's a 105-195, with a basic QSC amp. We have one speaker behind the screen, and 4 on each side wall.After installing a CD player shelf in the rack, I had to rewire all of the components because I shifted them around to make room. Well, my manager threw out all of my wire, so I had to resort to using 4 color thermostat wire to rig it up! The problem is, after the rewiring, everything sounds hollow. The surrounds aren't very loud at all, and the main speaker doesn't seem to have any "kick" to it. I'm thinking it's maybe an amp problem, cuz ever since the rewiring, the red light for Clip #2 keeps coming on. Suggestions? I downloaded the JS-200 manual and I'm currently reading it to try and figure things out. s
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John Walsh
Film God
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Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
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posted 12-25-1999 03:37 PM
It seems the problem is in the QSC amp, not the Ultra-Stereo processor, although I don't know much about Ultra-Stereo.Throwing out the existing wire and using thermostat wire in it's place is a big no-no. And after moving things around, there could be several problems, not just one. I'm not trying to be a pain, just saying it might not be possiable to fix right away. (I'm guessing) that the two outputs of the processor (front and surrounds) went to the two channels on the QSC. Could you have reversed which signal went to amp input #1 and amp input #2? The "clip" light is indicating that the input is too high, while the other channel seems too low. If you are sure that everything is wired correctly, it's as good a guess as any. Most processors have three wires for each output: high (sometimes marked "+"), low (sometimes marked "-") and ground. Could your have reversed ground and low- sometimes that causes a reduction in volume. Generally speaking, I think you will have to give us more clues to be able to get anywhere. Is the sound distorted? Does it sound ok at the booth monitor? Is there a emergency "bypass" setting, and what happens when you use it, etc....
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Scott Ribbens
Expert Film Handler
Posts: 118
From: Los Angeles
Registered: Oct 1999
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posted 12-25-1999 04:47 PM
Get some Belden 8451 or equivalent wire and get rid of that thermostat wire. The clip light on that QSC,(1200, 1400, 1700?????) is on one Channel only, or are both of them on? Recheck all of your connections from the processor to the amps, amps to the speakers, processor and amp outputs to the booth monitor. See which channel, if only one clip light is on, to see if it is the one going to the stage or the surrounds. If the QSC is one of those series one amps I listed above, it is possible that the gain control knobs were accidently turned when moving the equipment around. As the knobs on that series of amps are on the back of the amplifier, you might not have noticed it. Make sure that they are in the position that they were in before you moved everything around. Is the clip indicator(s) on all of the time, or only during louder passages? It is possible that the fan in the amp, if so equipped, has stopped running, that can cause heat build up problems. It is rare on the QSC, but I did run into that problem one time.Since the clip indicator/s started to come on after moving and re-wiring things, I would also check to see if some of that thermostat wire is shorted, maybe a couple of nicked wires when you stripped them? That could explain some of it. Please keep us informed! ------------------
Scott
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 12-26-1999 01:58 AM
>>"If you need some shielded wire quick and cheap, try Radio Shack's # 278-514 (20ft spool for $3.99) or # 278-513 (50ft spool for $7.99). "<<Let us not condone this sort of thing...cheap inappropiate wire is what got him into this mess. My guess is inexperience is another factor. Steve ------------------ "Old projectionists never die, they just changeover!"
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Scott Ribbens
Expert Film Handler
Posts: 118
From: Los Angeles
Registered: Oct 1999
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posted 12-26-1999 05:49 PM
"The main speaker in the auditorium sounds a lot better than it did yesterday. However, the surrounds aren't working at all (this was before I turned them off). When I listen on the booth monitor, everything sounds fine, but not in the auditorium." _____________________________________________Sounds like the speakers may have been out of phase as was stated above. Since you seem to have surrounds in the booth monitor and not in the theatre auditorium, I assume that you are listening to the processor outputs on the booth monitor. You may have shorted the amp output lines when rewiring, and that in turn caused the suround channel to go bad in the amplifier. You probably need to get a new, or used, amp . You should make sure that none of the wires are shorted in the surround chain or at the amp. Also make sure that when the amp is replaced, all of the wiring is double checked, and that all wiring is done with the POWER OFF. If you have to, unplug everything while rewiring, then after everything has checked out, no shorts, phasing correct ect..., power the system back up. ------------------
Scott
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