Subwoofer Troubleshoot

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Buckshot - 24 Apr 2004 05:09 GMT

I got it all hooked up, And what not I have an older JVC radio, I can't
recall the exact model but it only has a single preout. I just setup this
same system but with tens in a friends car. Here Goes:

two Sony Explode 10's
Pioneer DEH-3500
Legacy 1080(a?)

The only difference is mine are are twelves, and I have a shitty HU, with
single preouts where his has both. does this matter? I got both subs to work
splicing the RCA cables together but trashed them. But the subs won't hit at
all. Well the vibrate but thats about it. I suspected ground but tryed many.

Sorry for lenght TIA

Buckshot

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Scott Gardner - 24 Apr 2004 05:54 GMT

Are you sure you have the DEH-3500? Everything I've found on it says
it has two pairs of preouts. The Pioneer site doesn't have the manual
for the 3500 online yet, so I can't be sure.

Regardless, it shouldn't be a problem if your deck only has a single
preout. With Y-adapters, you should be able to feed all the inputs on
your amp. If you're not using the deck's built-in amp for your front
and rear speakers, you'll lose the ability to control front-to-rear
fading from the deck, but that's about it.

A ground problem shouldn't keep the subs from playing correctly,
unless the problem is inside the amp. If the subs are moving at all,
the solution probably lies elsewhere. Could you have wired the subs
out-of-phase? Or are you possibly sending a high-pass signal to the
subs instead of a low-pass? I couldn't find any information on the
Legacy 1080 amplifier - is it just driving the subs, or all of your
speakers?

Scott Gardner

>I got it all hooked up, And what not I have an older JVC radio, I can't
>recall the exact model but it only has a single preout. I just setup this
[quoted text clipped - 12 lines]
>
>Buckshot

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Buckshot - 24 Apr 2004 06:42 GMT

If you're not using the deck's built-in amp for your front

> and rear speakers, you'll lose the ability to control front-to-rear
> fading from the deck, but that's about

I am using the deck. Amp only for subs. At this point

Could you have wired the subs

> out-of-phase? Or are you possibly sending a high-pass signal to the
> subs instead of a low-pass?

Out of phase? Meaning... I have a toggle for HP, LP, FULL, when you flip it
you could hear a difference but not alot. It has that for both sides (side 1
Ch1, Ch2. Side 2 Ch3, Ch4). If you flipped the 1 and 2 you could hear one
sub change. The other did nothing.

This really leads me to believe its my deck :+(

Sorry, That system was my friends with the DEH, and his works wonderfully.
Loud as hell for sony's. Tomorrow I'm going to put my amp in his car and
see if it's maybe an internal problem. And then I will take my subs out of
my car and hook them up to his good reciever and such. Can anyone suggest
some recievers that have the dual preouts, that are front loaders. Right
now I have the JVC-KD70 I believe w/ a 12 disc changer. I want to upgrade I
don't like the changer..

Buckshot

> Are you sure you have the DEH-3500? Everything I've found on it says
> it has two pairs of preouts. The Pioneer site doesn't have the manual
[quoted text clipped - 32 lines]
> >
> >Buckshot

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mayhemkrew - 24 Apr 2004 07:03 GMT

Out-of phase meaning one sub is wired opposite of the other, and then each
sub cancels each other out. Try disconnecting one sub and reverse the wires
and see if the bass increases.

> If you're not using the deck's built-in amp for your front
> > and rear speakers, you'll lose the ability to control front-to-rear
[quoted text clipped - 63 lines]
> > >
> > >Buckshot

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Buckshot - 26 Apr 2004 03:14 GMT

Thanks Guys, I got it fixed. It was my ground and the POS JVC pulled
through. Thanks

Buckshot

> Out-of phase meaning one sub is wired opposite of the other, and then each
> sub cancels each other out. Try disconnecting one sub and reverse the wires
[quoted text clipped - 74 lines]
> > > >
> > > >Buckshot

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Daniel Snooks - 26 Apr 2004 03:37 GMT

> Out of phase? Meaning... I have a toggle for HP, LP, FULL, when you flip it
> you could hear a difference but not alot. It has that for both sides (side 1
> Ch1, Ch2. Side 2 Ch3, Ch4). If you flipped the 1 and 2 you could hear one
> sub change. The other did nothing.

In other words the Legacy 1080 is a 4 channel amp. You need to help us with
the particulars of that amp.
Can you bridge it to 2 channels?
What impedance are the Xplodes?
If the amp can be bridged to 2 channels, what impedance is it rated to
handle in that mode?
You should only need a single set of RCA's. There should be no need to split
them. Can you give us a break-down of all the switches and such that are on
the amp?
Ideally, you want to run the amp in 2-channel mode, each sub gets a channel,
the RCA's are used as an input to channels 1 and 2, the input is "shared"
with channels 3 and 4 (hopefully there is a switch that allows you to do
this, my PPI PC450 allows the inputs to be shared) You definately want LP to
be selected. You should also have a setting that defines where the LP
operates (the highest frequency that the subs are allowed to play) this
should be set around 80Hz.
If you can't bridge the amp down to 2 channels, then you are in a bit of a
bind. There probably won't be enough power available to get the Xplodes
moving much.

Answer as many questions as possible, and let's find out where the problem
really is.

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