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Old 14th November 2008, 06:28 PM   #1
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Location: St Louis Mo USA
Default Help finding correct amp plus wiring dilema.

My buddy has 3 Rocford HE2's 10 inch found here http://www.rockfordfosgate.com/news/...id=64&zoneid=3 . They are in a single sealed box. He is looking for an amp. He doesn't know much about this kind of stuff and I know my fare share but am no expert.

He tells me the guy he bought them from said that he had a "1000 watt 2 channel @ 4 ohm amp" on this setup. That to me doesn't make sense. Maybe he is misunderstanding his friend or his friend doens't know what he is talking about or I don't know what I'm talking about. I would see this as a possilbe 1000 watt amp maybe @ 1 ohm, 500 @ 2 ohm, 250 @4 ohm. Would that be correct. It was a class D amp that Rockford made around the time these speakers were made which I beleive was around 1993.

Anyway's all that aside he wants me to find him a good amp online (meaning bargain). We all know what kind of bargains you can find if you know where to look, which I do.

The only thing we are trying to figure first off is how many watts @ how many ohms should we be feeding this beastly setup. They are DVC 4 ohm 400 RMS\800 max. I went over there today and put a multimeter on it. I did it several times, theres is one input on the box. My MM read 2.8 ohm everytime. Which according to the JL Audio wiring diagrams, 3 DVC 4 ohm subs in Series\Parrelel ends up being 2.67 ohm. So I guess this is pretty close to right. Does this all make sense to you. I don't want to tell him to get a certain wattage amp at 4 ohm just to find out the amp sees 2 ohm and it roughly doubles the output and smokes his ****.

So any recomendtaions of wattage @ ohm for this?

Sorry so long
Thanks Dono
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Old 14th November 2008, 07:31 PM   #2
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Fosgate didn"t make a class d in 1993 that i know of .

Sounds like any amp of 1000 watts or so rms at 1 ohm or 2 ohm would work.
All kinds of cheap d class amps on the web .
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Old 14th November 2008, 08:19 PM   #3
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Quote:
Originally posted by ben04srt
Fosgate didn"t make a class d in 1993 that i know of .

Sounds like any amp of 1000 watts or so rms at 1 ohm or 2 ohm would work.
All kinds of cheap d class amps on the web .

These are 400 watt RMS subs why would I run a 1000 @ 1 ohm if they are basically 2.8 ohm final load? Not saying you are wrong just trying to understand this better.

And on the date not sure if it was 93 or not I just seem to remember that when researching the sub.
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Old 14th November 2008, 08:25 PM   #4
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Is each sub rated at 400 watts rms or the three together?

If each sub is rated for 400rms that would be 1200 rms for the three together.
I guess I wasn't paying attention, rms at 2 ohms should be around 1000 watts .
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Old 14th November 2008, 08:33 PM   #5
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That's what I thought just making sure.

Thanks
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Old 14th November 2008, 08:54 PM   #6
damage is offline damage  United States
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Subs were made in 2003.
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Old 15th November 2008, 12:52 AM   #7
ppia600 is offline ppia600  United States
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Quote:
Originally posted by damage
Subs were made in 2003.
Also I believe their class d amps came out around 02.

I would run a single channel d class 1000 watt on those subs. That will be plenty for them. You will have enough to kill them with a true 1200 watt rms amp. The HE's aren't very rugged.

Give them a little too much and you'll need one of these
http://cgi.ebay.com/Rockford-Fosgate...3286.m20.l1116

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Old 15th November 2008, 01:01 PM   #8
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Quote:
Originally posted by ppia600

Give them a little too much and you'll need one of these
http://cgi.ebay.com/Rockford-Fosgate...3286.m20.l1116

That's funny I will pass along the hint to not kill them too much.

Thanks for all the relpies, but I got it figured out. Just checkin my self before I wreck myself.

I already have a couple of good amps picked out for him. Including the same amp his dealer tried to sell him but for a little over $300 less.

Thanks Dono
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