I have a Pioneer 3750MP HU and I'm planing to get a 4ch amp. In my car nw there's 1 comp set in the front doors and 2 8" subs in the boot. There's also the stock kelisa speakers in the rear board but its not used presently.

My question is, how should i wire the amp? I plan to route the HU's front output to the amps front input (to power the comps) and the HU's RCA out to the amps rear input (to power the subs). The i plan to route the HU's rear out directly to the rear speakers which are presently not used. Doing this for the benefit of the occasional times i carry ppl in the backseat.

Wat do you guys think?

Sounds like a good plan, if there's front and rear pre-outs, check whether the rear pre-outs can be changed to subwoofer pre-outs, i know certain Pioneer HUs have that feature.

Rear speakers powered by the HU isn't that bad, but try to fade your Front/Rear balance to the front so as not to create bad imaging(with the rears being overpowered and sound seemed to be coming from the back)

Yup that's the plan actually. However, just to clarify, there's only one set of pre outs which I believe will be used for the subs. Must check though if it can be 'selected' for this purpose. Thanks

if theres only 1 pair rear preout... u can just use a splitter and connect it to both fron and rear channels of the 4 channel amp... connect the front of the amp to the front speakers and the rear to the woofer.... just make sure ur amp has that switch for the sub (forgot what its called).

rear speakers connect to player and u should have a good sound staging...

only thing to make sure is that ur amp is powderful.... otherwise itll end up cutting off if it gets too hot or during serious bass sections of the song... like what happened to me last time.. my solution i ended up getting a monoblock

Hm... what you mean is that your HU only has a single pre-out? You'll probably need to get an amp that's have got a built in y-spliter, most reputable brands have the ability to only use a single RCA input for 4-channels, just have to take note of that when purchasing. It's rather not advisable to get a Y-splitter.

well another option is to get an RCA converter
convert your front speaker output to RCA to connect to you amps
using back stock connection for your rear

Yes I think this is the option I will go for. How much can i expect to pay for one of these? No more than a few dollars I expect?

i will prefer to use a Y-splitter in this case =/

Is there any benefit in the sound quality by doing this?

at least it's better to use a Hi-Lo converter
bear in mind that HU power got much higher THD and low voltage

I second the Y-Spilter > Hi-Lo Convertor. Most Hi-Lo convertors, especially the cheap ones, would most often than not, induce noise into the system instead.

What's your budget for amplifier? If you are willing to get used, i believe you can still get used amps with the ability to use only a pair of inputs for 4-channel amplification.

hmm.... i used to use a RCA converter before i changed my HU and i didn't notice any white noise also. of course i rather have the signal split in the amp itself than using RCS converters or y-splitters. of you can always use active xovers

My budget's around RM700 for a 4 ch. Any recomendations?