[troll5501]

My current project is to replace my existing old subs, because the foam surrounds are deteriorating (yes, my system dates back to the early 90s). I'm currently using two 4-ohm subs with a PPI 2150AM amp rated 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 using 2-channel mode, or wire both woofers as a single 4-ohm load to the amp in bridged mode.

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

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

Any suggestions?

Thanks,

Bryan

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

--

The Clown Prince of Car Stereo




"troll5501" wrote in message
...

My current project is to replace my existing old subs, because the foam
surrounds are deteriorating (yes, my system dates back to the early
90s). I'm currently using two 4-ohm subs with a PPI 2150AM amp rated
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 using
2-channel mode, or wire both woofers as a single 4-ohm load to the amp
in bridged mode.

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

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

Any suggestions?

Thanks,

Bryan


--
troll5501

[NOBASS]

Originally Posted by troll5501

My current project is to replace my existing old subs, because the foam surrounds are deteriorating (yes, my system dates back to the early 90s). I'm currently using two 4-ohm subs with a PPI 2150AM amp rated 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 using 2-channel mode, or wire both woofers as a single 4-ohm load to the amp in bridged mode.

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

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

Any suggestions?

Thanks,

Bryan

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

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

Nice amp by the way... :thumbsup:

Mark