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Car Forum / Driving, Maintenance, Tuning / Car Audio / March 2005

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Best Impedance for Dual Voice Coil Subs using PPI 2150AM

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troll5501 - 26 Mar 2005 21:05 GMT
My current project is to replace my existing old subs, because the foa
surrounds are deteriorating (yes, my system dates back to the earl
90s).  I'm currently using two 4-ohm subs with a PPI 2150AM amp rate
at 150W x 2 @ 4-ohm load or 300W x 2 @ 2-ohm load.

I ordered a new pair of subs that are dual voice-coil (4-ohm per coil)
so I can either wire each woofer as a 2-ohm load to the amp usin
2-channel mode, or wire both woofers as a single 4-ohm load to the am
in bridged mode.

My concern is overheating of the amp.  I don't want to stress the am
too much.  Currently I have plenty of power for my listening needs an
I'm not planning on entering any SPL contests.  

So I'm wondering if I should have ordered the dual voice-coil 2-oh
woofers so I can wire each woofer as a 4-ohm load to the amp usin
2-channel mode, and therefore allowing the amp to run cooler.  On th
other hand, the 2150AM is rated for a 2-ohm load (4-ohm bridged) s
maybe I shouldn't worry about it.

Any suggestions?

Thanks,

Brya

--
troll5501
joe.ker - 26 Mar 2005 22:16 GMT
The Amp is going to run about the same in 2 ohm stereo or 4 ohm bridged. it
will run hotter. Your other option would be to run each speaker in series
and run the amp at 8 ohm stereo, but your volume will be lower

Signature

The Clown Prince of Car Stereo

> My current project is to replace my existing old subs, because the foam
> surrounds are deteriorating (yes, my system dates back to the early
[quoted text clipped - 21 lines]
>
> Bryan
NOBASS - 30 Mar 2005 15:53 GMT
troll5501 Wrote:
> My current project is to replace my existing old subs, because the foa
> surrounds are deteriorating (yes, my system dates back to the earl
[quoted text clipped - 21 lines]
>
> Bryan

Speaking from current experience with AM amps, I'd run the amp i
stereo mode at 2 ohms per channel.  I have experimented with tw
woofers in parallel or each woofer with its own channel of power, an
the latter has always sounded better.

As for stress, take a look at the impedance light as the system i
running.  If it doesn't come on, you should be just fine.  Just giv
the amp a bit of "breathing room", and if you're really worried abou
it run a small fan over the heatsink.

Nice amp by the way... :thumbsup:

Mar

--
NOBASS
 
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