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+--- Thread: Have a look at this for a laugh... (/showthread.php?tid=8241)
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Have a look at this for a laugh... - Dark Samurai - 28-06-2019
Bought a new sub tonight from eBay, was a JBL GTO 752 Amp with a JBL GT1202D 12" Subwoofer.
Got it home and tried it out indoors and it seemed to be clipping with the assumtion that it was blown due to no bass and flapping at medium to high volumes, so we thought we'd open it up, and to our surprise we found a few shocking things:
1) The wire was way too thin to run this sub and amp set up, pic below:
2) This sub is a dual voice coil and he only had one voice coil wired in, pic below:
3) He had wire in the negative on the box to the positive on the sub, which would mean the sub would be out of phase...
So we put thicker gauge wire in, wired it up to all terminals on the sub are being used, and it's all wired correctly to box and amp now.
Pics:
This is how thin the wire was in comparison to my index finger:
![[Image: file-76.jpg]](http://i1201.photobucket.com/albums/bb346/oli3107/Corolla%20T%20Sport/file-76.jpg)
The way it was wired:
![[Image: file-74.jpg]](http://i1201.photobucket.com/albums/bb346/oli3107/Corolla%20T%20Sport/file-74.jpg)
![[Image: file-75.jpg]](http://i1201.photobucket.com/albums/bb346/oli3107/Corolla%20T%20Sport/file-75.jpg)
So the guy who sold us this set up had no clue of what he was doing in the slightest, but it's sorted now, so we'll try it tomorrow and see what it's like in the car!
Oli
Have a look at this for a laugh... - FirebirdPhil - 29-06-2019
OMG thats horrific, what I would expect from a 14 year old who didn'r know the 1st thing about electricity.
Have a look at this for a laugh... - parthiban - 29-06-2019
Lol, I wouldn't know what I was doing either but I'd have the sense to ask someone else or get in a pro - was the guy you bought it from using it like that?
Have a look at this for a laugh... - Fry-Up - 29-06-2019
probably the reason he sold it
Have a look at this for a laugh... - Sparkystav - 29-06-2019
setting up sound systems are so critical.
ive been thinkning about changing my sub and amp recently cause i had very little bass.
however very little investigating and a change of a couple of pots on the amp and the car booms again
Have a look at this for a laugh... - greeny - 29-06-2019
Howd u wire it?
Have a look at this for a laugh... - is300_dino - 29-06-2019
lol looks like he blew his budget on the sub, then got the cheapest roll of speaker cable with the small change he had left over? D'oh!
Have a look at this for a laugh... - Stoney - 05-07-2019
greeny Howd u wire it?
Yes Oli, how did you wire it? No pics of the finished article!
I see a jumper is fitted there, for running it in serial. Is it dual 4 Ohm voice coils? So in series the amp would see 8 Ohm.
Presuming you have a 2 Ohm stable amp? You should wire the voice coils in parallel and run the sub at 2 Ohm for a lot more POWER!!
Have a look at this for a laugh... - Dark Samurai - 05-07-2019
I agree.
Have a look at this for a laugh... - Dark Samurai - 05-07-2019
We wired positive to red on sub, and negative to black on sub, obvious so it runs however it runs that way on 4 ohms? Bridged.