planning sound system upgrade, 03 g35

You might not need another monoblock depending on the rms watts of your subs if you have 2 300 watt rms subs and a 750 watt rms monoblock then you wouldnt need another amp. Just run the speakers in parallel off of the one channel. I run 2 12s off a monoblock right now and it sounds great. I dont know if putting the sub on one side of the vehicle is a good idea I would think it would throw your sound way off.Where does your enclosure mount in the vehicle?-A vision without a plan is just a hallucination-

Cool, this is actually the news I was wanting to hear! That JL Audio HD 750 monoblock is pretty powerful, and since the 10w1v2 woofers I'm looking at (also JL audio, ironically) have an RMS rating of 150 (300w max), then this amp should be able to power them both with no issues right? I could easily fit the HD 750 and HD 600 amps in the OEM Bose amp location, I imagine.Here's a link to the enclosure and how it mounts into the vehicle. I'd get one for each side (driver/passenger): http://www.4080enclosures.com/shop4080/store/comersus_viewItem.asp?idProduct=1&image=3

spmpdr wrote: You might not need another monoblock depending on the rms watts of your subs if you have 2 300 watt rms subs and a 750 watt rms monoblock then you wouldnt need another amp. Just run the speakers in parallel off of the one channel. I run 2 12s off a monoblock right now and it sounds great. I dont know if putting the sub on one side of the vehicle is a good idea I would think it would throw your sound way off.Where does your enclosure mount in the vehicle?

So would I do better to hook up the dual 10's in parallel or series? Being a 1-channel (monoblock) amp, the JL HD 750 would need a parallel/series config to support multiple woofers. If both woofers run at 4 ohms, should I use your parallel configuration to power them? Wouldn't that decrease the impedance? So the JL HD 750 runs 750w RMS@1.5ohm-4ohms. If I run the dual 10's in parallel then the impedance drops to 2ohms, which the amp can support just fine. In fact, it looks like I should be able to run both subs to their max power output levels (300w max per woofer) if wiring in parallel. Going in serial does the opposite, right? So it'd raise the impedance level of the speakers, essentially taking them up to 8 ohms, which that amp doesn't support, correct? Thanks again for all the guidance!

Okay guys, I have to switch gears for a second... I was pretty set on getting a pair of JL Audio HD amps (750 and 600) to take care of my four main channels and the sub channel, however it turns out that I am able to get a great deal on the Polk PA1100.5... That said, will it work for my requirements? As of now, I think I'm going to get two 4080 enclosures, and put JL 10w1v2-4 woofers in them. Would the Polk amp be able to power the four main channels (125x4@2ohms), in addition to two woofers on the sub channel? Seems like a lot for one amp to handle. Keep in mind those JL subs run 150w RMS each @ 4 ohms. I was thinking I could hook them up in parallel so they run at 2 ohms. The Polk amp runs 600x1@1ohm for the sub channel. Is this a good option to power my system? I will literally spend like $200 for my amplifier needs vs. about $1000 for those JL HD's. But I want to make sure it's gonna work! As for physical fitting, based on some other G35 owners pics of the JL 500/5 mounted in the OEM Bose amp location I think the Polk amp would actually fit in there (though it'd be tight). It's six inches longer than the JL, but I think there's some room to extend a bit more if necessary, as noted from the pics I saw. Thanks! Brian

The polk amp will work but for how long?,That would be my only concern.I know the jl amps are spendy but they are very good and reliable. You should be able to find them for alot cheaper than 1000 bucks too. Also if you wanted to get a smaller monoblock for your subs you could,If each one of subs is 150 watt rms then thats 300 watts rms total. So you just need a 300 watt rms rated amp ,it can be a 2 channel class a/b or a monoblock , that alone could save you a few hundred bucks ,because the amps you have selected are to big,but would work,Try to match your rms ratings and ohm ratings amp to speaker.then you are almost perfectly powering what you have rather than under or over powering them .-A vision without a plan is just a hallucination-

Thanks,any idea if this amp would power two subwoofers wired in parallel? Pioneer GM-D7400M It runs 400w on a single channel at 2ohms. If I wire the woofers in parallel, then that should provide about 200w to each woofer, as the impedance will drop from 4ohms to 2ohms, is this correct? But that is still above the RMS rating for the subs. Maybe I should abandon the concept of sharing a single channel amp for two subs, and just go with an amp that has two output channels rated at something like 150w x 2 @ 4ohms? Since these woofers are rated at 150w RMS, does that mean I should definitely NOT exceed that power level? Meaning should I just get an amp that gives exactly 150w to two channels at 4 ohms? If so, here's a good candidate: http://mobile.jlaudio.com/products_amps.php?amp_id=436 I guess, in general, it'd be good to know if I should target my amplifier's output to the RMS (not the max) rating of each speaker to be powered. Is this the way to go? TIA!

yes you should try to match the rms rating of the speakers,to the rms rating of the amp,The rms rating is the continuous amount of wattage OF A SPEAKER OR AN AMP.So the closer they are together more efficient your set up is.What is the rms rating of that jl audio amp per channel and ohm load,if it is 150 watts rms @2ohms or 4ohms(stereo) you are good.I would recommend a monoblock still because alot of them are rated class d wich is a better than a/b when it comes to subs.Im sure you can find one that is 300 watts rms.But that 2channel jl is a very good choice too as long as it is to those specs above.I looked at the link and couldnt find the specs.-A vision without a plan is just a hallucination-

Thanks, that JL Audio amp above is rated as follows: Rated Power (2 Channel Mode): 150 W RMS x 2 @ 1.5 ohm-4 ohm (11V-14.5V) I can get a monoblock, but I guess I want to make sure that the single-channel amp will be able to adequately, reliably power two subs. Is it generally better to go with a 2-channel sub when you're powering two subs, or is it very common to just run them in parallel off a monoblock? Thanks...

It is very common to run 2 subs off a monoblock but the amp you have is perfect for your application,It is up to you .The only problem I see with that amp is that its not stable at 2ohms bridged but you running in stereo anyway so that doesnt matter.-A vision without a plan is just a hallucination-

Sorry for the newb question, but what's bridged vs. stereo? Does bridging mean you're combining the two channels into one, more or less, whereas stereo is using both channels separately?

spmpdr wrote: It is very common to run 2 subs off a monoblock but the amp you have is perfect for your application,It is up to you .The only problem I see with that amp is that its not stable at 2ohms bridged but you running in stereo anyway so that doesnt matter.