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Power a car stereo for the PC

post #1 of 12
Thread Starter 
So I have a few parts from my old car stereo from my teenage years lying around, and I figure its about time I put them to use. Here are the parts:

2x Alpine Type R Dual 2 ohm Coil 15" Subwoofer
1x Alpine Amplifier, 1000W RMS @ 14.4V
2 sets of Pioneer 6 1/2" Speakers 60W RMS
2 sets of Pioneer 80W RMS 6"x9" Speakers

I can build the enclosures properly for all the speakers and everything, but there is still one major problem - powering the whole thing. The amplifier needs an extremely powerful transformer to run 1000W RMS (or 700W @ 12V), plus I'd need more for the speakers (4 channels @ 140W RMS each). And there is no way that even several computer PSUs can handle the load spikes that this system would put out. I've considered buying a completely new home stereo but it would cost way too much money at this point in time.

So my question is, are there any reasonably priced home amplifiers that can handle these things? And what would be better/cheaper, getting a transformer to power that big amplifier or just replacing it?

I just can't wait to play Doom on these things, actually feeling the explosions would be awesome
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post #2 of 12
Right....
What would be the total fusing amount? 140a?
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by EricM9104 View Post
Right....
What would be the total fusing amount? 140a?
The amplifier i have is fused at 80A, and I'm going to guess that the other amp will be around 40A. So yeah I guess with a deck it would come out to 140-150A.
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post #4 of 12
buy a sound card and some nice speakers.


saves u the hassle of having to buid some contraption to run all of it,plus making the enclosure for the speakers. it's good to come up with ideas and stuff but if parts are readily available just go the easy way out.car stereo euipment outside of a car sound like ****. every seen those idiots on bikes with subs and a car stereo while there crusin' around.....
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post #5 of 12
Quote:
Originally Posted by Manyak View Post
The amplifier i have is fused at 80A, and I'm going to guess that the other amp will be around 40A. So yeah I guess with a deck it would come out to 140-150A.
Ok.
You'd need 2-3 PSU's (and the total for 12v amperes on the 12v rails combined would need to be 140a+).

Quote:
Originally Posted by roningai View Post
buy a sound card and some nice speakers.


saves u the hassle of having to buid some contraption to run all of it,plus making the enclosure for the speakers. it's good to come up with ideas and stuff but if parts are readily available just go the easy way out.car stereo euipment outside of a car sound like ****. every seen those idiots on bikes with subs and a car stereo while there crusin' around.....
Right.
Speaker enclosures aren't hard to build.
I'm sure you've used car audio equipment in a house, right?
Tell me, how is it going to sound like crap? They're just speakers, certain car audio brands make some speakers more "flashy" so high-school kids will buy them. Even if it's in a car, and you put it in a horribly designed enclosure, it'll sound like crap, same thing in a house environment.
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post #6 of 12
Why don't you just buy an adapter to plug the amp into the wall? Nevermind, just get a normal amp and plug your computer into an input jack.
Way too expensive
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Way too expensive
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post #7 of 12
Quote:
Originally Posted by Manyak View Post
So I have a few parts from my old car stereo from my teenage years lying around, and I figure its about time I put them to use. Here are the parts:

2x Alpine Type R Dual 2 ohm Coil 15" Subwoofer
1x Alpine Amplifier, 1000W RMS @ 14.4V
2 sets of Pioneer 6 1/2" Speakers 60W RMS
2 sets of Pioneer 80W RMS 6"x9" Speakers

I can build the enclosures properly for all the speakers and everything, but there is still one major problem - powering the whole thing. The amplifier needs an extremely powerful transformer to run 1000W RMS (or 700W @ 12V), plus I'd need more for the speakers (4 channels @ 140W RMS each). And there is no way that even several computer PSUs can handle the load spikes that this system would put out. I've considered buying a completely new home stereo but it would cost way too much money at this point in time.

So my question is, are there any reasonably priced home amplifiers that can handle these things? And what would be better/cheaper, getting a transformer to power that big amplifier or just replacing it?

I just can't wait to play Doom on these things, actually feeling the explosions would be awesome
Personally, I would try to sell off your existing amp and get several smaller power amps that will run on 120v AC. A unit that comes to mind immediately is the Behringer A500. If you were to wire one of your Alpine's in series to get a 4-ohm load, I don't think it would have a problem at all running them bridged for around 360 watts at 8 ohms, probably closer to 440 watts at 4 ohms (all theoretical, of course. Much power beyond that you'll start to get clipping if I've done my math right). Grab one or two more for your other speakers depending on how much your mobile amp sells for and I think you'll be quite pleased with the results.

The issue I can see is if you wanted to use both subs off the same amp - you'll not be able to get any higher than a 2-ohm total load with dual 2-ohm DVC woofers, which is on the low side for this amp. The only other option (parallel) would put the load at under 1/2 an ohm, which is dangerously low and would almost certainly harm the amp. I would not recommend either of these configurations.

The other amp I would suggest is the Crown XLS 402A. You might have to hunt around to get one, but you should be able to find it for about $300 and it's good for just shy of 600wpc at 2 ohms with both channels driven. That should get your Alpines moving.

Edit: I was wrong about your wiring options - if you put both voice coils on both woofers into series, and put both woofers in series, you should be able to get an 8 ohm load at the amplifier. In the case of the Behringer that leaves you with 360 watts bridged, with the Crown you could potentially bridge for 800 watts.
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by Chipp View Post
Personally, I would try to sell off your existing amp and get several smaller power amps that will run on 120v AC. A unit that comes to mind immediately is the Behringer A500. If you were to wire one of your Alpine's in series to get a 4-ohm load, I don't think it would have a problem at all running them bridged for around 360 watts at 8 ohms, probably closer to 440 watts at 4 ohms (all theoretical, of course. Much power beyond that you'll start to get clipping if I've done my math right). Grab one or two more for your other speakers depending on how much your mobile amp sells for and I think you'll be quite pleased with the results.

The issue I can see is if you wanted to use both subs off the same amp - you'll not be able to get any higher than a 2-ohm total load with dual 2-ohm DVC woofers, which is on the low side for this amp. The only other option (parallel) would put the load at under 1/2 an ohm, which is dangerously low and would almost certainly harm the amp. I would not recommend either of these configurations.

The other amp I would suggest is the Crown XLS 402A. You might have to hunt around to get one, but you should be able to find it for about $300 and it's good for just shy of 600wpc at 2 ohms with both channels driven. That should get your Alpines moving.

Edit: I was wrong about your wiring options - if you put both voice coils on both woofers into series, and put both woofers in series, you should be able to get an 8 ohm load at the amplifier. In the case of the Behringer that leaves you with 360 watts bridged, with the Crown you could potentially bridge for 800 watts.
Those amps look absolutely awesome, TY One question though - do those amps have built-in LPF crossovers or would I have to buy one separately? I'd also need BPF/HPF crossovers for the other speakers so that they don't start clipping with the bass at higher volumes.

I'm hoping to not have to use the deck :/
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post #9 of 12
Quote:
Originally Posted by Manyak View Post
The amplifier needs an extremely powerful transformer to run 1000W RMS (or 700W @ 12V), plus I'd need more for the speakers (4 channels @ 140W RMS each). And there is no way that even several computer PSUs can handle the load spikes that this system would put out.
Consider getting one or two 1-farrad capacitors to take the brunt of the power spikes that the amp will pull. It may still be stressful on any pc PSU.

here's on on the CHEAP! http://yhst-38616620066226.stores.ya.../dbpc1-0f.html
post #10 of 12
Thread Starter 
Quote:
Originally Posted by slngsht View Post
Consider getting one or two 1-farrad capacitors to take the brunt of the power spikes that the amp will pull. It may still be stressful on any pc PSU.
I had originally thought of doing that.....but do you realize how dangerous those things are? lol. If those caps blow they don't just 'pop', they explode.
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