i have this 5 channel amp
and it only has one connection for a subwoofer, 1 positive and 1 negative

does this mean i can only install one sub??

 

What are some more of the specs on the sony 7557 - what does the 5th channel pump out @ 4ohms? Is it 2 ohm stable? If so, what is the wattage rating?

If you can give us this info. we can give you some suggestions. If you want more than 1 sub hooked up, there are some wiring schemes that will allow you do it and still see a 4ohm load on amp

 

to be exact...here it is:

http://www.crutchfield.com/S-J...7&s=0


Sony ES XM-7557
75W x 4 + 220W x 1 Car Amplifier

Key Features:
90 watts x 4 + 280 x 1 at 2 ohms
180 watts x 2 + 220 x 1 in bridged mode
subwoofer channel stable to 1 ohm (280 watts RMS)

 

You could have 2 subs wired up to the 5th channel. If you are saying the sub channel is 1 ohm stable - then just wire both subs in parallel.

 

does it matter on what subs i get like how much impedance each one is or wat size (10's, 12's)

 

You can install as many subs as you want,as long as the load is not lower then 1ohm, 10s,12s,15s,or 18s, [there is a point of diminishing return] 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by devilpuppy &raquo;</TD></TR><TR><TD CLASS="quote">does it matter on what subs i get like how much impedance each one is or wat size (10's, 12's)</TD></TR></TABLE>

The actual size of the driver doenst matter. The impedence is extremely important though. if its one ohm stable as you say, you'll need a pair of 2ohm SVC subs or a pair of DVC subs with 4 ohm VC's.

 

so if i get the ohms on teh subs....ur sayin i can connect as many as i want to that ONE channel.....there is only one + and one -

thats it!!

 

Yeah, you can hook them all up to one channel. it's like having a mono amp. Only one output. That's why as others stated, at 1 channel, you can only run a DVC or 2 SVC to make it stable at 2 or 4 depending if you wire in series or parallel.

Keep this in mind, the RMS each sub needs to be driven

 

okay...i got 2 12's in a sealed box...how do i go about connecting them?

do i take teh positve from each sub and join them together and put them in teh positive and take both negatives and connect the together then put to the negative connection on teh amp?

remeber this amp has only 1 subwoofer output channel....only ONE + and -

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr_dc2 &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, you can hook them all up to one channel. it's like having a mono amp. Only one output. That's why as others stated, at 1 channel, you can only run a DVC or 2 SVC to make it stable at 2 or 4 depending if you wire in series or parallel.

Keep this in mind, the RMS each sub needs to be driven</TD></TR></TABLE>

No, you can run as many subs as you want, and as EBP_SI said the impedence is what is important, [ what the amp sees as the load]

what kind of subs do you have devilpuppy? one voice coil or two? and what is the impedence of the voice coils? 94

 

i have 2 of these:

Pioneer TS-W304C
12" 4-ohm Component Subwoofer

http://www.crutchfield.com/S-k...W304C

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by devilpuppy &raquo;</TD></TR><TR><TD CLASS="quote">so if i get the ohms on teh subs....ur sayin i can connect as many as i want to that ONE channel.....there is only one + and one -

thats it!!</TD></TR></TABLE>

if you put alot of subs on that sony amp you might not hear any bass

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by devilpuppy &raquo;</TD></TR><TR><TD CLASS="quote">i have 2 of these:

Pioneer TS-W304C
12" 4-ohm Component Subwoofer

http://www.crutchfield.com/S-k...W304C</TD></TR></TABLE>

wire the subs in parallel, pos. to pos. neg. to neg. and then to the amp.<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bassisliffe &raquo;</TD></TR><TR><TD CLASS="quote">

if you put alot of subs on that sony amp you might not hear any bass </TD></TR></TABLE>


Yea there is a point of deminishing return. 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">
wire the subs in parallel, pos. to pos. neg. to neg. and then to the amp.
</TD></TR></TABLE>


simple as that

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote"> Yea there is a point of deminishing return. 94</TD></TR></TABLE>


i think that line is already crossed

a 5 channel sony amp


thats like something out of my nightmares


does the sub part use different rcas? so you could tune it as a seperate channel??

 

yea..the deck has its own sub control....which means it has its own rcas, right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bassisliffe &raquo;</TD></TR><TR><TD CLASS="quote">
i think that line is already crossed

a 5 channel sony amp


thats like something out of my nightmares

</TD></TR></TABLE>

Comon bass you don't have nightmares, you try them 94