something ain't right..

[Sneaky Pete 10+ year member]

Ok here's the deal.

Got two jl Audio w4's 2ohm dvc 15 in Woofers

1 r.f. 801s amp

one 2 chamber box with 2.25ft^3 per chamber

the woofers dvc's are wired in a series. the woofers are wired stereo.

Numbers: the woofers are supposed to be running 4ohm stereo at 200 watts rms

by my calcs.

the box and power are the recommended specs for the company.

anyway the problem is this:

The woofers are not very loud. can barley hear them. NO vibration in air. they make a sort of popping sound with a hard note.

Is this a wiring problem, box problem?

How can I fix this? Modify the box, wiring, cast a magic spell ? ? ? ?

Click to read more...

 

[EzekialPhoenix 10+ year member]

Well I cannot comment on the box, but I can tell you your impedence calculation is wrong. I don't know what you mean by your woofers being wired stereo. I am going to assume that means you are not bridging them at the amp. If you are running the subs in series, you are running them at 8 ohms. This is probably why you aren't getting much out of them. If you have two subs that have 2 ohm dvc's on them, run the coils in series, connect the woofers in parallel, and wire them to the amp in "stereo". That will give you 200 watts to each speaker instead of the puny amount of power you are currently giving them.

 

[Sneaky Pete 10+ year member]

"+" of left channel to "+" of v.c. 1, "-" of v.c. 1 to "+" of v.c. 2, then "-" of v.c. 2 to "-" of left channel. And the same for the other channel??

I did this.

I shoud be running a 4 ohm load on each woofer, right?? the amp is rated 2x200 watts rms @ 4ohms.

Is there a difference running 2x200rms @ 4ohm than running the same name brand amp (smaller) at 1x200watt rms @ 4ohm?? both woofers are still getting 200watts rms aren't they??

 

[tommyk90 5,000+ posts]

Each sub should be wired to its own channel.

The first channel + to the subs first +, channel - to - on the OTHER voice coil. Then wire the - from the first coil to the + on the other coil.

Do that for each sub, that would be a 4 ohm stereo load.

 

[helotaxi 5,000+ posts]

Two things to check. One, make sure that the subs are wired in phase to each other. In other words, check to make sure that the + wire going from the amp is going to the + terminal on the sub. If the subs are out of phase with each other, then they will cancel each other out and will sound about how you describe. Two, make sure they are each getting the same signal from the amp. The best way to do this would be to wire the subs in series and bridge the amp. You will get the same power you are getting now but you will not have the cancelation possibilities because the subs are getting the same signal.

 

[Sneaky Pete 10+ year member]

the speakers are in phase. (+ & -) there is no air leaks. made double sure of this. it seems to me the box is too big???

 

[Sneaky Pete 10+ year member]

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[pt123]

Are you using a line out converter for the signal? I used one on my mustang and found out that it sucked so i had to buy a new one. Hope this helps.