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Old 03-24-2005, 08:47 PM   #1
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Default What'* going on???????

I hooked up my Infinity 12" sub to a cheap 200 watt (100x2) JVC amp (bridged) and all that I get is a very faint buzzing sound from the sub -is my sub blown (and my ego -I bought the sub new about 1.5 months ago and didn't opt for the extended warranty although the manufacturers 1-yr warranty is still in effect if I can find the reciept).
I've double and triple checked the wiring and all looks fine.
I do have RCA splitters as I only am running one pair of RCA'* and the amp is a two channel.

Thanks in advance,
Martin
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Old 03-24-2005, 09:09 PM   #2
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Sounds like some feedback. Where'* your ground? On FM,AM, CD etc i assume?

One thing Smellbird and I did to diagnose an amp was but the cars butt to butt and run a signal to the other amp to test signals/wiring etc.
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Old 03-24-2005, 09:13 PM   #3
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I drilled a hole in the trunk floor, and put a metal screw with a lock-washer through it -the terminal for the ground end is gold plated as is the connection at the amp end.
I cleaned the paint from the trunk floor before I put the ground screw in, and made sure the screw was in all the way.
The ground cable is 4G RF cable with Phoenix Gold connections.
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Old 03-24-2005, 09:14 PM   #4
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Car on or accessories do any difference?
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Old 03-24-2005, 09:24 PM   #5
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Quote:
Originally Posted by BonneMeMN
Car on or accessories do any difference?
No difference with the car on, or key turned back to accessories. This has me stumped -it'* been awhile since I did my last amp/sub install, but it isn't that hard that I would forget anything.
Good inline 40 amp bulb fuse
Good connection at battery and amp for power cable
Good connection at deck and amp for RCA'*
Good connection at deck and amp for accessory power line

Cables were installed cleanly, and power cable was run through the firewall (not sneaked through the front of the door) and run underneath carpet and there are no kinks or major bends.
I 'bridged' (think that'* what it'* called when you run the wires from + to + and - to - terminals on the sub which has 2 sets of terminals) the wire from the amp to the sub at the sub.
Or was I supposed to go from one + to second - and second + back to the first -?
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Old 03-25-2005, 04:42 PM   #6
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If you are wiring a dual 4 ohm sub to a 2 ohm load:

On the woofer connect one "+" to the other "+" and one "-" to the other "-"

then connect a "+" and the opposite side'* "-" to your amp (in the same fashion).

Voila, 2 ohms. boom... boom... boom...

If that is how you've hooked it up already, I would take your RCA splitter out and try to run it directly off the unit'* output. Set your fader to "0" and turn your amp'* gain up until you hear something. If that fails, replace your RCA'*, if that'* doesn't work, replace your amp, and if that doesn't do it get a new headunit. ah ha ha ha ha...

Really though, good luck.
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Old 03-25-2005, 08:58 PM   #7
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Quote:
Originally Posted by katfl0res
If you are wiring a dual 4 ohm sub to a 2 ohm load:

On the woofer connect one "+" to the other "+" and one "-" to the other "-"

then connect a "+" and the opposite side'* "-" to your amp (in the same fashion).

Voila, 2 ohms. boom... boom... boom...

If that is how you've hooked it up already, I would take your RCA splitter out and try to run it directly off the unit'* output. Set your fader to "0" and turn your amp'* gain up until you hear something. If that fails, replace your RCA'*, if that'* doesn't work, replace your amp, and if that doesn't do it get a new headunit. ah ha ha ha ha...

Really though, good luck.
Dude, do you work at Ultimate Electronics in St. Cloud, MN? That is practically verbatim from the guy there. I am going to hook up my cheap spare set of RCA'*. I hope that'* the problem. Sucks too because the Stinger RCA'* I have in there now are some really heavy duty RCA'*, and I really wanted to save the others for the amp for the rear 6x9'* which I plan on getting at Ultimate Electronics -my buddy who works there just told me today that the place is shutting the doors at it'* 8 month old facility on April 9th, and they have to have EVERYTHING sold when they close the doors and he is going to get me some amps, maybe some Punch subs, and a nice deck for dirt cheap since he works there. Can't wait. Now to get some money together as I need some nice home audio/video equipment for my apartment that I am looking for.
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Old 04-02-2005, 01:30 AM   #8
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Sounds like your Sub is blown.
The easiest way to check is turn on the stereo (medium volume) and slowly and gently push straight down on speaker in question. If it starts to play while holding down on it, then its blown.
FYI, When a speaker is truly blown the voice coil burns in half and the speaker doesn't move unless the wires are reconnected, hence holding down on the speaker. By holding down on the speaker you are checking to see if the voice coil has seperated.

The other alternative is to take out the speaker and use a multimeter on the Ohms setting and measure the resistance across the two terminals. Should be 4 ohms, other wise its fried.

Good luck,

Dutch
MECP Certified & 310k Licensed,
Electronic Tech
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Old 04-02-2005, 02:19 AM   #9
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Oops! Forgot to update.
I got the setup working, but it sounds halfass. I found the only way to get power to the sub from the amp was to hookup both of the - terminals on the amp. It say to hook the + for the right channel and - for the left channel to bridge.
At least it'* working but it still sounds like one of the VC'* is bad. Sucks too because this is a brand new sub, and this was the first time it'* been powered -the amp is a tiny JVC 2-channel with no specs on it -nor can I find the model when I googled it. :( I'd suspect no more than 250-300 peak bridged to 2 ohms.
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Old 04-02-2005, 01:56 PM   #10
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where is your power cable in relation to your RCA cables? They should be atleast 1/2 the car width appart. IF not run on opposite sides.

It does sound like it may be blown. If you want a picture of burned voice coils let me know. I can get some.
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