I just recently installed a pair of Alpine SPR-57C in the front of my 96 coupe, and I'm looking to add another pair to the rear. At the same time, I'd also like to get an amp installed with the intention of adding a 10" sub down the road a little.

My questions involve running the speakers in parallel and how the power load will be.

1.) If I get a 4-channel amp, and run each side of the car in parallel (with a single channel for each) I should be able to bridge the last 2 channels to the sub right?

2.) Each speaker is rated for 4 ohms, and say the amp is rated for 60x4 @ 4 ohms, what will the power output be to each speaker running in parallel? Will each still get 60w RMS? Max RMS per speaker is 100w.

I already know that by taking 4 channels and consolidating to 2, I will no longer be able to fade to the rear or front. I could get a 5-channel amp and give each device it's own channel, however when doing so the sub would get stuck with a rather low wattage channel, hence why wanting to bridge 2 together for just the amp.

I'm deciding between a used JL Audio TMA T320.4 for $100, or Pioneer GM6400F for $130. My max budget for the amp is $150, and I definitely want to be able to add a sub in the future. I've also had people tell me to screw the rear speakers, and just keep the front ones and get a sub. However when I turned off the rear speakers and just ran the fronts, it just didn't sound good at all, and I'm not sure I could handle not having the rears

 

1.) maybe
2.) if both speakers are 4 ohm speakers, the power from the amp will be evenly divided between them. If you wire two 4 ohm speakers in parallel, you will show the amp a 2 ohm load and you said your amp is rated for 4 ohm. so if you have 60 watts at 4 ohms, you will need two 8 ohm speakers to split the 60 watts total, or 30 watts each.

 

So if the amp is rated for 60x4 @ 4 ohms, and 75x4 @ 2 ohms, then when I bridge the pair of 4 ohm speakers, each speaker would then be getting 75w RMS through a single channel from the amp since that's what it's rating for is at 2 ohms resistance? So, 4 speakers going @ 75w each on 2 channels? Then the last 2 bridge for 150w combined? Here's the amp I'm thinking of getting, http://www.crutchfield.com/S-2feCzh9...-GM-6400F.html

 

75/2 = 37.5 watts per speaker

 

Ok then I'll get a 4-channel for now, and a mono block when I get the sub. What 4 channel amp would you recommend for a budget of $150 or less? Is that Pioneer any good?

 

ill tell you what the pio 4 channel is a great cheap amp installed a few of them and its older brother the 6300f and 6200f never a problem