31 replies to this topic

[PSA]

Hey guys

I have a rockford fosgate d212d4 SUB which is 2000w 1000rms, its a dual 4 dvc.....i'm having trouble looking for a mono block that would run my sub to almost full potential about 1800w and 900rms....i've looked at the wiring diagram and it says the AMP should be at 2 ohms and the sub is at 4 ohms...i need help please.

Edited by PSA, 17 May 2009 - 01:00 AM.

[~Spyne~]

your sub is dual voice coil, 4ohm+4ohm.
this means that you can either wire the coils in series and present an amp with an 8ohm load, or wire them in parallel and present a 2ohm load.
ideally you want an amp that is 2ohm stable and will produce at least 500wrms @ 2ohms. its that simple.
you can get amps that will make more at 2ohms (for example, 1500wrms) and as long as you set the gains on the amp correctly (there is a tutorial on this site for how to do this) then it will still be perfectly fine

[PSA]

thanks for your help but i still don't get it....would there be a mono block that you might know that would do the job.

[Steve77]

Most amp manufacturers would make a suitable monobloc. It's not that complicated.

Only 2 requirements really:
1) It must be 2 ohm stable (assuming you want to wire the sub for a 2 rather than 8 ohm load)
2) It should have a suitable power rating

[~Spyne~]

what is your budget? we can then recommend some suitable products

[Damo95]

maybe look at a rockford fosgate mono??

[PSA]

im looking to spend around 800.......when i look at the spec i don't know what i should be looking at to tell me if it stable at 2 ohms and couse my sub is dvc 4 ohm i don't know how much power will be running through it.

[NiFTiTEk]

Your subwoofer has two voice coils.

Each are rated at 4 ohm each.

when you run your sub from a monoblock amp, mono amps only has one set of speaker terminals
whereas you sub has two speaker terminals.

This means you have to join the two from the sub together to make one set of connections to be
able to connect it to your amp.

You put the two (+) terminals together and the two (-) terminals together.

When you create this type of electical connection with your sub you complete combined resistance
actually becomes 2 ohm

this is why you need a monoblock to do 2 ohm.

normally if its not printed that it can do two ohm somewhere in the amps specifications or on the
box steer clear! I wouldnt trust a monoblock that cant do a 2 ohm load, alot are capable of 1 ohn
these days!

Hope this helps :-)

Cheers,

-Frank-

[PSA]

Thanks alot that helped alot i get it now.....Do you know any mono blocks that might do the job im looking at 1800watts and 900rms to my sub

[{Chips}]

Please stop referring to the peak watt rating. It means nothing. Its a marketing gimmick.

You want an amp that ideally outputs 1000WRMS at 2 ohms.

Have a look at something like THIS JBL amp. It has a bit more power than you need, but if you are sensible with the gain control it will be fine.

[PSA]

that looks perfect....is JBL good...i got them in my peugeot 407 which they come standard and they do a hell of a job but are the amps good.

[{Chips}]

Well, my JBL amps do a hell of a job. I don't have any issues with them.

IMO they are a solid amp, with a nice clean output.

[Westy87]

Mate I have one of those JBL 14001 amps and it is quite good! I only paid $600 last year. My SPL reading went from 133.4 off the jaycar 1k mono to 137.4 off the JBL. Good power for the price and it looks quite nice too

[jukebox]

jl audio 1000/1 is a great amp... should be able to get it easily for that budget...

check it out....

[PSA]

sorry JUKEBOX but i heard that JL AUDIO is rubbish...i haven't tried them but i've heard of them and not many people say good things about them....whats your experience with them.