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Looking to push 9,000 watts RMS... What size alternator will be required?

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Ok... I just bought a couple Soundstream XXX-10000D amps today. Most likely I'm gonna run them with 4 - 12s or 4 - 15s in a trunk car, seriously considering 4 - Sundown Zv4's. But... my real question is, what kind of total alternator amperage would I need to get enough juice to the 2 XS Power D7500s? I don't know the ratio... Thanks!


1994 Mazda RX7 with LS1 Swap and 2 - 10" Kicker L7's in Truck Boxes (because of extremely limited hatch space)

2003 GMC Yukon XL with 3 - 12" MTX 9500's and still has the third row seat (over 7.5 cu ft of enclosures behind third row)

1971 Chevrolet Nova with LS1 Swap (work in progress, most likely 4 - 12" Alpine Type R's as I already have them)

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Did you say you bought a couple of XXX10ks or just 1? Your title says 9000w but you say you bought 2 10k amps. Im confused.

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I think those amps only put out like 5k IIRC, Cody.


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im reading two of those amps as well. Thats a LoT of batteries and as many big alternators as you can fit.


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Did you say you bought a couple of XXX10ks or just 1? Your title says 9000w but you say you bought 2 10k amps. Im confused.

I think those amps only put out like 5k IIRC, Cody.

Here are the specs from Soundstream on these amps. I do have 2 of them. But as of right now... they will probably not go into the same vehicle.

Soundstream XXX-10000D

Dimensions: 27" x 11.5" x 2.6"

7,998w RMS @ 1 Ohm 13.5v

5,834w RMS @ 2 Ohm 13.5v

4,140w RMS @ 4 Ohm 13.5v

8,245w RMS @ 1 Ohm 14.4v

6,014w RMS @ 2 Ohm 14.4v

4,268w RMS @ 4 Ohm 14.4v

8,500w RMS @ 1 Ohm 16.0v

6,200w RMS @ 2 Ohm 16.0v

4,400w RMS @ 4 Ohm 16.0v


1994 Mazda RX7 with LS1 Swap and 2 - 10" Kicker L7's in Truck Boxes (because of extremely limited hatch space)

2003 GMC Yukon XL with 3 - 12" MTX 9500's and still has the third row seat (over 7.5 cu ft of enclosures behind third row)

1971 Chevrolet Nova with LS1 Swap (work in progress, most likely 4 - 12" Alpine Type R's as I already have them)

1961 Chevrolet Corvette Restomod with LS7 Swap (system upgrade will be one of the first things that I'll do)

Solo Basshead For The Most Part, None Of My Close Friends Have A Passion For It, Nor The Money For It. If I'm Home And Free... Always Looking To Meet Up With A Fellow Enthusiast To Talk Shop Or Do Demos! Hard To Find Fellow Bassheads (Not Crack or Heroin Addicts, I Can Find Them Everywhere) In Baltimore / Mid-Atlantic / DMV areas.

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Are you running 18 volts. If not dont expect rated. Single power and ground? Expect abiut 3500 a piece out of em at 14 ish volts or less. They only make power at low load and high voltage. Either way dual alts is a good start as well as the twp 7500s. Id feel more comfortable with a 3rd 7500 or the equivalent 6 3100s though


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yeah running two of those i would try to get two alts as big as you can fit. and if only one alt more batts. those amps are power hungry from what i seen.


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Are you running 18 volts. If not dont expect rated. Single power and ground? Expect abiut 3500 a piece out of em at 14 ish volts or less. They only make power at low load and high voltage. Either way dual alts is a good start as well as the twp 7500s. Id feel more comfortable with a 3rd 7500 or the equivalent 6 3100s though

I'm hoping for a little more than 3,500w a piece of these things. I was thinking dual alternators might be needed and probably 2 XS Power 7500s. I actually posted another topic like 45 minutes ago, about where to find a retailer/shop/anybody really, that has some of the Dual 0/1 Gauge inputs, into the 0/1 Gauge Stub. I realized with the single power and ground the amp wouldn't be getting all the voltage that it would want.


1994 Mazda RX7 with LS1 Swap and 2 - 10" Kicker L7's in Truck Boxes (because of extremely limited hatch space)

2003 GMC Yukon XL with 3 - 12" MTX 9500's and still has the third row seat (over 7.5 cu ft of enclosures behind third row)

1971 Chevrolet Nova with LS1 Swap (work in progress, most likely 4 - 12" Alpine Type R's as I already have them)

1961 Chevrolet Corvette Restomod with LS7 Swap (system upgrade will be one of the first things that I'll do)

Solo Basshead For The Most Part, None Of My Close Friends Have A Passion For It, Nor The Money For It. If I'm Home And Free... Always Looking To Meet Up With A Fellow Enthusiast To Talk Shop Or Do Demos! Hard To Find Fellow Bassheads (Not Crack or Heroin Addicts, I Can Find Them Everywhere) In Baltimore / Mid-Atlantic / DMV areas.

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Lets just go with the worst case scenario and say you see a full 8000w from 1 of the amps. If you have s d7500s, I would want a 270a alt at the BARE MINIMUM. I would prefer to see something closer to a 350a alt. Now if you can only fit a single 270a alt, then you will need an additional D7500.

I will send you a message about the inputs

Edited by CJ18

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Lets just go with the worst case scenario and say you see a full 8000w from 1 of the amps. If you have s d7500s, I would want a 270a alt at the BARE MINIMUM. I would prefer to see something closer to a 350a alt. Now if you can only fit a single 270a alt, then you will need an additional D7500.

I will send you a message about the inputs

Yeah... the first car I'd be looking to put it into would probably be my 1971 Chevy Nova with the LS1 Corvette engine. I've never seen a dual alternator kit for that, and I was planning on getting a Supercharger on the Nova too, so a second alternator may cause issues. And... it's difficult to find H.O. Alternators for my engine, I saw one on Sound Solutions that's 270a that I was going to get.


1994 Mazda RX7 with LS1 Swap and 2 - 10" Kicker L7's in Truck Boxes (because of extremely limited hatch space)

2003 GMC Yukon XL with 3 - 12" MTX 9500's and still has the third row seat (over 7.5 cu ft of enclosures behind third row)

1971 Chevrolet Nova with LS1 Swap (work in progress, most likely 4 - 12" Alpine Type R's as I already have them)

1961 Chevrolet Corvette Restomod with LS7 Swap (system upgrade will be one of the first things that I'll do)

Solo Basshead For The Most Part, None Of My Close Friends Have A Passion For It, Nor The Money For It. If I'm Home And Free... Always Looking To Meet Up With A Fellow Enthusiast To Talk Shop Or Do Demos! Hard To Find Fellow Bassheads (Not Crack or Heroin Addicts, I Can Find Them Everywhere) In Baltimore / Mid-Atlantic / DMV areas.

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