Is parallel/bridging a good idea?

[kennyboi9o9of88]

I'm running a JL Audio 300/4 and currently using all 4 channels, but I want to remove the rear channels to power a sub. I know that if I bridge the rears I will be getting 150W RMS and that should be enough to power a JL Audio 10W1. The thing is that I want to keep a balanced look with 2 subwoofers and powering at 150W RMS each and my question is, is there a way to power both at 150W RMS?

[Bak@EMSPowered]

You'll need to use a different amp to power the two subwoofers.

[Maruki-kun]

Originally Posted by baktasht

You'll need to use a different amp to power the two subwoofers.

only if you want 150 to each. if you can deal with 75 each, you can use one amp.

[kennyboi9o9of88]

I really don't want to run another amp considering I'm running an amp in the frunk right now and Don't have another spot to put another amp. Actually I can mount another amp at the bottom of my 300/4, but that's just gonna cost me more money.

I was looking at JL Audio 8w3v2 with optimal rating at 125W RMS. Wouldn't 75W RMS be kinda too low not giving me enough power? Or would you say go with a single 12w1 would be better? I plan to build a ported box anyways so maybe 2 8s would be good at 75W RMS? What do you guys think?

[Maruki-kun]

two 8's on 150W RMS total, 75 each would be best.

[jigtrix]

You can install 2 woofers if they can handle the power and if they are both 4 ohms parallel wired together which gives you 2ohm resistance to the amp. Also check if the subs you got are single or dual voice coils. I got a link where it shows a subwoofer tutorial for JL audio. Hope this help you answer your question.
JL Audio

Originally Posted by kennyboi9o9of88

I'm running a JL Audio 300/4 and currently using all 4 channels, but I want to remove the rear channels to power a sub. I know that if I bridge the rears I will be getting 150W RMS and that should be enough to power a JL Audio 10W1. The thing is that I want to keep a balanced look with 2 subwoofers and powering at 150W RMS each and my question is, is there a way to power both at 150W RMS?

[jigtrix]

You do not need to buy a second amp. Your 300/4 is a 4channel and very flexible. You can run your components for the front stage and then bridge the rear channels for the subs. You can bridge your amp and get 150watts. for the rear subs. Go with 2 8" subs running one channel of 150watts RMS.

I would go with a pair of 8 woofers rather than a single 12" sub. The reason why is that you get a lot more tighter bass with 2 8" woofers rather than a single 12" sub. Mr2 also lacks space and a 12"box behind the seat is quite umpleasant with no leg room.

The 8w3v2 is a discoutinued model from JL. It came in 3 different models.
8w3v2-d2 which is 2ohms, 8w3v2-d4 which is 4ohms, and the 8w3v2 which is 6ohms. Please specify the model you have or check the online manual below. Please look at the wiring option listed there. It will give you the right direction in how to hook them to your amp. http://mobile.jlaudio.com/pdfs/8W3v2_MAN_pages.pdf

Originally Posted by kennyboi9o9of88

I really don't want to run another amp considering I'm running an amp in the frunk right now and Don't have another spot to put another amp. Actually I can mount another amp at the bottom of my 300/4, but that's just gonna cost me more money.

I was looking at JL Audio 8w3v2 with optimal rating at 125W RMS. Wouldn't 75W RMS be kinda too low not giving me enough power? Or would you say go with a single 12w1 would be better? I plan to build a ported box anyways so maybe 2 8s would be good at 75W RMS? What do you guys think?

[kennyboi9o9of88]

I'm still slightly confused on parallel wiring. I understand the diagrams and been doing research on what to do. And based on my research, I learned that if I bridged AND parallel wired 2 woofers on my JL Audio 300/4 amp, I would get 150W RMS to both subs if impedance is maintained at 4ohms. But some sites say that when you parallel, you lower the power output. So basically my question is, if I bridge AND parallel subs to my amp, how much power would be distributed in each sub? The JL Audio rates at 75W RMS each channel.


Here's a crappy diagram of what I plan to do. The picture shows the 2 rear channels being bridged and series/parallel to the subs. So how much power is in each sub with this wiring?

Thanks alot jigtrix for the wiring diagram and in regards to what you suggested in parallel setup to get 2ohms, my amp cant handle 2ohms when bridged. From what I have read from the owners manual, when under 3ohms bridged, the amp will go into safe mode.

[Maruki-kun]

what? no. you cannot use 300w to your subs unless you use all of your 4 channels, you will not get 300w out of half of that amp. you are like... defying some law of something. you can't make power if the power isn't there.

the only way to get 150 to each sub is to use all 4 channels.

[kennyboi9o9of88]

hahahhah I think I there's a huge confusion going on here hahaha.

I didn't mention that the front channels are to power my component speakers in the front and the 2 rear channels are for the subs. And the setup in the diagram is questioning how much power is going to each sub. If it's gonna be only 75W going to each sub, then I'll just use my rear wires that I wired to the 3 1/2" speakers to power the sub to get 75W to each sub. I guess I'll try 2 8s for now and if it's not good enough, I'll bridge and get a single 12. Trial and error seems the best way to go...except the cost.

[kennyboi9o9of88]

ignore this reply

[jigtrix]

I assumed that the JL 300/4 was 2ohms stable, sorry I was wrong. Some JL amps are 2ohms stable thou.
I guess your only option is to hook up the subs to each channel and run 75watts. The 8" subs will be ok unless you listen to your stereo really loud. GOod luck w/ your system.

Originally Posted by kennyboi9o9of88

hahahhah I think I there's a huge confusion going on here hahaha.

I didn't mention that the front channels are to power my component speakers in the front and the 2 rear channels are for the subs. And the setup in the diagram is questioning how much power is going to each sub. If it's gonna be only 75W going to each sub, then I'll just use my rear wires that I wired to the 3 1/2" speakers to power the sub to get 75W to each sub. I guess I'll try 2 8s for now and if it's not good enough, I'll bridge and get a single 12. Trial and error seems the best way to go...except the cost.

[kennyboi9o9of88]

Thanks guys for the inputs and I have gone with 2 10s in the rear. I wanted 2 8s, but some guy was selling 2 10s in bazooka tubes for 100, so I couldn't pass that offer. I gotta say...it's more bass than I anticipated hahah.

They're 2 JL Audio 10w1v2 in bazooka tubes. Don't know why he was selling them so cheap and could care less because it is awesome.