Sub wiring???

Kania2k1 · June 8, 2002

I'm trying to figure this out. I was planning on putting 2 12W6's under the rear seat. Worked out the plans and it seems on paper that they will fit, but barely, but would have too much airspace by about .50 cubic feet. So I tried it with 4 10W1's. I am planning on using only 2 amps in the system. More than likely Rockford's but that might change.

My main question is: With 2 subs wired in parallel, I think that's right, the total load on the amp would be 4 Ohms. The amplifier for the subs I am considering the RF Power 450s, an 2 channel amp. According to rockford's spec sheet, the amp produces 225 watts by 2 channels at a 2 Ohm load, which is what the amp will "see" with each pair of subs wired to 1 channel. Left pair to left channel, right to right. Now the subs are rated by JL to 125 watts of "continuos power". Now, with each of theses wried together, would they then be able to handle 250 watts total per channel???

Thankx in advance, sorry for the length!

NeXuS1 · June 8, 2002

why do you want four 10s? thats just a little over kill. two good 10s would be fine. remember that each sub would only get a portion of rms power of the amp. so the more speakers you add the more power you need for them to play correctly. more surface area isnt all ways the answer. you could get two 4ohm 10s and wire them in parallel, and unless you want to break glass it'll be loud enough.

if you bridged that rockford into 1 channel and ran the 2 8ohm subs in parallel for 4 ohms you could get 450x1 from that amp. and normally a 4 ohm load stress an amp less then a 2 ohm one. and honestly i don't know if i would push the new rf stuff that hard with a 2 ohm load, i just don't trust it anymore. just doesn't have the same quality anymore.

maybe i missed the whole point all together, oh well.

Kania2k1 · June 10, 2002

Okay, 4 10's was more like a worst case scenario. I could fit them, doesn't mean I'm gonna use 'em ;) Sorry I didn't include that in the original post. The basic question I had was if you have say 4 subs, each capable of handleing 250 watts each, you would need to have an amp capable of producing 1000 watts, correct? Using mono block amp for this experiment. More than Likely it will be 2 12's, unless I can find someone with 2 10's that can change my mind. I listen to a buddy of mine's truck, ('99 Silverado) with 1 12 in it and it sounded really weak, not much punch to the bass. I don't want to slam my forehead into the windshield, but I would like to blur the mirrors a little! Thanks for the quick resonse Nexus! :music:

Dihappy · June 10, 2002

I was planning on putting 2 12W6's under the rear seat. Worked out the plans and it seems on paper that they will fit, but barely, but would have too much airspace by about .50 cubic feet.

You cant be seriuos?

Too much internal air space for 2 12's??

Under your rear seat??

NeXuS1 · June 10, 2002

The basic question I had was if you have say 4 subs, each capable of handleing 250 watts each, you would need to have an amp capable of producing 1000 watts, correct?

thats the idea, but doesn't always work out that way. as long as you can get the sub(s) close to its rms power rating and build the box correctly. you should be happy. trying to say give every drop of power that a sub is rated for can be very expensive, specially with 4 of them.

everyone's setup is different. each truck/car is different so what sounds good in yours could sound like butt in another. so don't go completely by other's setups. use it as a partial guide. its possible your friend's setup is not tuned for his truck so it doesn't perform like it should be. there is all sorts of reasons. maybe low end equipment. etc..

MarkD · June 10, 2002

First, let me say that I am adding 2 legacy (older) Soundstream 10's to my 3-door Z71. Mounted in a sealed enclosure presenting about 1 cu ft. to each speaker. They have 4 ohm voicecoils, will be wired in parallel to present a 2 ohm load to a Sony amp that puts out 200 watts rms mono to a 2 ohm load (XM-10020).

To find resistance(ohm load) use the following equations...

Parallel = 1/s1 + 1/s2 + 1/s3 + 1/s4 = 1/load

example: (4) 8 ohm speakers (voicecoils) all in parallel

1/8 +1/8 + 1/8 + 1/8 = 1/2

2 ohm load

Series = s1 +s2 + s3 +s4 = load

example 2: (2) 4 ohm speakers in series

4+4 = 8

8 ohm load

Kania2k1 · June 11, 2002

Sorry, DiHappy, ALMOST too much, I fisquoted the jl website. The box would have at most about 1.4 Cubic feet of airspace if I calculated it right, trying to remember geometry equations! The site says .75-1.75 cu. ft. sorry! :blush:

Cyclic · June 12, 2002

Before the "incident" I was running a single 10" MTX in a Q-Logic custom under seat box on a MTX amp and it flat hammers. Clean tight and loud, enough said.

FIRECAT · June 25, 2002

Kania,

Run (3) JL 10W6's series parallel to your amp bridged mono, you won't be dissapointed.

silverado man · June 25, 2002

I've got one JL 10W6 in my truck and it pounds. I don't think you would need anymore than two 10's.

Kania2k1 · June 26, 2002

Firecat, I had considered that, but couldn't develop the box for them. Not too concerned about the stereo right now. The exhaust sounds too good to be drowned out by the stereo yet!