i have a basic 04 without a mach system, have aftermarket HU Boston Acoustic 5.25" in front doors and BA 5x7's in back deck in stock location.

found a guy on CL selling a complete trunk enclosure with factory amps and speakers (price unknown)

i was wondering if it would be worth to grab it and put the BA in it to feel some more bass out of them. (im assuming thats what the enclosure acts like...a sealed woofer box)

i would not use the amps as i have a RF 400w amp powering all my speakers now. basically getting it for the formed enclosure.

OR i could use the amps to power just the speakers and save MY amp to put in a 10" sub i have in my basement.

thanks guys!

 

the factory amps are made to power 8 ohm woofers, not 4 ohm full range drivers and the enclosures are often too small to fit an aftermarket speaker.

 

he agreed to $50 and said everything works....i saw someone on here put regular 5x7 in his rear deck...actually same model speakers i will be putting in Boston Acoustic 5x7's

i didn't know if it would be worth the hassle

i have a 10" JL i would like to put to good use i found the specs to be here...under 10W0-8

http://mobile.jlaudio.com/pdfs/10_12_15W0_MAN.pdf

TTOCS, would the factory Mach amps run that JL sub?

 

no.......

 

so given my 4 speakers run at 50 RMS @ 4 Ohm and the JL sub runs optimum at 125W continuous at 8 Ohm (from JL website I linked) and the 2 channel amp can run the following:

100 watts RMS x 2 at 4 ohms
200 watts RMS x 2 at 2 ohms
400 watts RMS x 1 at 4 ohms in bridged mode

so there is no way to have my sub and speakers hooked up, the amp is not good enough. and im assuming i could not amp just 2 speakers (fronts) on one channel and power the sub with the other channel since it is a 100W @ 4 Ohms and the sub is 8 Ohm....

 

I think for 50 bucks you would have been better served paying 50 more buying something like this http://cgi.ebay.com/12-inch-Sub-Tube...item20b0850e73 and leaving your other amp (400w) driving your doors/deck. (not a fan of tubes but still probably would have been better option for ya)

 

well i didn't buy it, was doing research first.

right now i have all door/drear deck speakers 50W rms @ 4 Ohm. the sub is 125W @ 8 ohm.

my setup now is 2 door speakers on one channel and 2 rears on the other channel, having the amp put out the capable 200W X 2 @ 2 Ohm.

My plan:

amp front door speakers so the amp still in the capable 200W X 2 @ 2 Ohm. on the other channel wire the sub at 125W @ 8 Ohm....

would there be a problem with the sub channel? i did a lot of reading online about setups but little iffy on how a 8 Ohm load on a 2 Ohm supply setup would work.

i should be fine given the 8 ohm sub will not make the amp over-work itself correct? and given it is 8 Ohm, the sub would prob not see the full 200W (a good thing since optimum watts is only 125W)

 

Edit..just saw your last post^^

I couldn't tell ya. Ohms screw with my brain lol. ttocs knows much more on this subject than I do. Personally though I don't think that would be worth doing. The sound quality lost from the amped bostons in the rear deck isn't likely to be made up for by that sub. Just my guess. If anything I'd pick up another small 100w mono amp for the sub if you can even find one. 100w is really small. I'd bet you could run a bit higher (200w maybe) with gain down low. JL are tough subs.

 

ahah, well I read through this and couple other sites...Mechanical Engineering degree helps does come in handy...

http://www.termpro.com/articles/spkrz.html


from that i gathered since i can run the amp at the 200W x 2 @ 2 Ohm configuration.... my speaker channel (2, 4 ohm speakers in parallel net 2 ohms total) give an output amp power of 200W(so that matches) each speaker will be seeing 100W....more than the RMS of 50 but not the peak of 150W. thinking of playing with the gain to accomodate.


the sub channel still at the 200W x 2 @ 2 Ohm configuration, will have an amp output power to the sub of only 50W. being this underpowered will not hurt the sub, but will obviously not give the optimum performance (directly from JL's website on how to set up this sub)