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Connecting Gemini GVX SUB15P

B

bluemangroupie1

Oct 19, 2011
7
0
#1
I have a Phonic 740 powered mixer with two Phonic S715 speakers and a Gemini GVX SUB15P powered subwoofer. I know this is a terrible combination of PA equipment but it'll have to do because I am on a strict budget.

I connected the two S715 speakers into the mixer from the back main. Then ran a TS to XLR cord from the back of one of the S715 speakers into the subwoofer.

This was working great for awhile then one day the subwoofer stopped working. I don't know what caused it as a lot of different people use this equipment.

I know this setup worked with the "tape in" input with the RCA to 3.5mm hookup. But the prongs got stuck in the "tape in" input so I have begun using the AUX in input. Could this be the issue?

Please could someone tell me why the subwoofer has stopped working? Is it the fact that I am using the AUX input? Any help would be appreciated. Thank you.

Basic drawing of setup:
ImageShack® - Online Photo and Video Hosting

Mixer and speakers:
Phonic Powerpod 740 Plus / S715 PA Package: Shop Pro Audio & Other Musical Instruments | Musician's Friend

Subwoofer:
Invalid Link Removed

Subwoofer cord that was working:
Amazon.com: GLS Audio 25ft Patch Cable Cords - XLR Male To 1/4" TRS Black Cables - 25' Balanced Snake Cord (NOTE: THIS IS NOT A MIC CABLE!): Electronics

AUX input:
http://www.amazon.com/gp/product/B000068O35
 
As an Amazon Associate, TalkBass may receive commissions from qualifying purchases made via links on this site.
#2
Jumping out of a speaker that is powered by an amp in the powered mixer and into a powered sub is like running an amp into an amp. Not good.

Only way to run a powered sub off a powered mixer is send an aux out from the mixer to the sub. then turn up aux send on kick and bass tracks only.

It's called aux fed subs.
 
#3
You seem to have been running a speaker signal into a line input.
The sub is expecting a line signal and the signal coming of the back of the speaker is many times greater than a line signal. Therefore, I would guess the sub is now in a very bad mood.

As mentioned above, the proper way to feed that sub in your situation is with an aux. Your mixer does not appear to have an aux, but if you don't use FX, you could use the EFX send for the sub. If you are using the FX, then use the front panel main out. It's a line level signal and you can plug your TRS right in.
 
#5
OK, I deliberated a bit and realized something.
You are running a signal into the aux in, correct?

You first need to turn up the aux using the Aux In fader. This will route the signal to the mains. Check that you can hear the signal in the main speakers.

On the front of your mixer, you have a Main Out jack. This is a TS, unbalanced, mono signal. You can plug your TRS to XLR cable in here for your sub feed. Technically, you are sending a unbal signal to a balanced input, but the sub should be able to deal with it.

If that doesn't work, we may need more details.

EDIT: I looked at the GVX SUB15P's specs, and its combo jacks do accept balanced OR unbalanced input. So with your current cable, you should be fine with a send from the Main Out.
 
#7
bluemangroupie1 said:
Thank you for your replies!
I tried to plug it in the front "output main" and heard nothing. When I turned all the volumes up the mixer's green limiter light flashed a little. I am at a complete loss!
Click to expand...

If I had to guess, I'd say your sub probably needs repairing after having a few hundred watts being pushed into a circuit that's designed to handle 1.4 watts.
Sorry; that's why you have to read the manual.
 
#9
I believe when I bought the sub I tried the main output in the front of the mixer before I ever tried it in series with the powered speaker and it never worked then either. Maybe I am wrong though.

How could I get the sub fixed? Would it be worth repairing or do I need to buy a new one? If it is a relatively simple fix I may be able to do it myself since I have a lot of soldering tools?
 
#10
So you checked and you do not hear sound from the sub when connected to the main output?
The last thing to do would be make sure there is a signal coming out of the main output and also make sure you try different cables.

I'm not so sure as to what fixing the sub would require. There might be lots of fried bits or there might simply be a melted protection device.
 
#11
There is no sound from the sub what so ever out the main output in the front. I swear this was always the case. I'll see if I can find a friend with another cable or possibly buy a new one. If not looks like a bad sub I guess. Thank you for all your help!
 

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