98gpse

Hey I have done decks and OEM size speaker replacements in anumber of cars but when it comes to things like subs I'm really a noob lol. I know what rms and such are for amps and subs but I'm not sure how your suposed to choose what amp to go with what sub and things like that.
Right now I have
-a Pioneer DEH-P4600MP deck(also have a JVC KD-G120 but not sure if I'll use that or the pioneer)
-Pioneer TS-A1371R 5 1/4" Speakers up front
-Pioneer TS-A6961R 6"x 9" Speakers in the back
in my 98 Grand Prix

I recently got a pair of Pioneer TS-W255C Subs
They are rated at 50-350watts RMS at 4 ohms
700 watts peak (not that usefull a number I know)
They are in one sealed box and have one set of terminals on the back of the box for each sub
I know to install it I need to run power wire and the fuse must be no more then 18" from the battery. I then need to run RCA cables and a remote turn on wire on the oposite side from teh power wire.

Now that you know my situation my question is what amp do I need if I want to run them in parallel? Which if I'm not mistaken will mean that the amp will run at 2 ohms. So more or less what ratings am I looking for?
Thanks for the help.

scuba789

Look for an amp that puts out 700 watts mono at 2 ohms or you could go with a 2 channel amp that puts out around 350 watts per channel into 4 ohms.

98gpse

Ok why 700 if it's in parallel (just trying to learn lol)?

danyman

iTrader: (1)

2subs connected together in any way = 700watt
2 channel amp can put 1 sub on each terminal at 350watt per channel

scuba789

Yeah if you wire the subs in parallel you'll get a 2 ohm load. With 700 watts of power each voice coil gets half (350 + 350 = 700)

98gpse

ok so if I do it in parallel on a monoblock or out of one channel i need an amp taht does 700watts rms at 2 ohms load
if I do it using 2 channels then I end up needing 350 rms per channel at 4 ohms.
what would be the cheapest/most reliable way to do it considering all I'm going to be doing is powering the subs.

Also I asked some of my friends about this and they suggested against a two channel amp because they say I will end up having the left one hit at different times then the right. I think that's bull since it's only getting the one mono signal from the deck not a sterio signal but are they right?

danyman

iTrader: (1)

it would make a difference but not something you would really notice at those low notes

would still be better though at 1 channel... less problems at the end

scuba789

No it's a law of physics. You're friends are completely wrong if you wire both subs in phase then they will play at the same time. If there are any delays in electrical signal they will be too small for you to hear the speed of an electron is around 2/3 the speed of light depending on the conductor.

98gpse

Ok well I just went on another forum I belong to and there is a guy having a similar problem as I am. They suggested taht he would have to find a amp that has an rms output of or just over one of his subs rms rating while running at 2 ohms in a parallel circut and taht would be good to power both subs. This sounds right since doesn't a paralel mean taht if I get 350 watts at the point that they branched into the two loads (subs) there is 350 into both branches therefore both subs get 350.

scuba789

the 700 watts splits (branches) into 350 watts to each speaker.