PE plate amp power rating? (1 Viewer)

[MichaelAngelo]

Please, can someone tell me the output of the PE sub amp at a 2 ohm load? I've seen 180@8ohm and 270@4ohm, but never a 2 ohm rating.
They may not be rated for 2 ohm operation, but I've had 2 running a 2 ohm load for about 7 months, no hitch.(with a tiny duct from AC blowing over the fins- the amps are wall mounted)

 

[jeff lam]

Judging by the jump from 8 to 4 ohms thats a 150% increase in power, so using the same method you should get 150% of 270W which is 405W. This is just a guess on my part, I can't confirm this but I would think it would dish out about 400W into 2 ohms.

 

[jeff lam]

DOUBLE POST, Connection keept timing out.

 

[Cam S]

Hmmm, interesting that you've been running them @ 2 ohms. do they get hot at all?? I have the AVA250, it should be able to handle 2 ohms as well then.

 

[Andrew Bowzer]

This may be an extremely good thing then. Is there any answers to the reliability of the PE amp @2 ohms. I have a Resonant Engineering (car audio) sub just sittin in my room waiting to be sold. If I could give it 400 RMS, it would REALLY shine, and I wouldn't have to deal with the constant bottoming out of my Orion sub I'm trying to kill, but it won't. I'm almost at the point of plugging it into the wall.

 

[Michael R Price]

Just because you put it on a lower impedance load doesn't mean it will have more power. If the amplifier's output is limited by current capability at 4 ohms, which it probably is, then you will see less output into 2 ohms. Either way, the amp is not designed for it and most people would tell you to play it safe and not play it loudly into 2 ohms. If you're not going to blow the house down feel free to give it a shot though (I think it would be safe if you don't run it too hot.)

Example: An amplifier is designed to operate with max power into 4 ohms at a maxmimum voltage output of 20V RMS, and can put out 5 Amps of current. The output into 8 ohms is 50W (limited by voltage at 20V, 2.5A), into 4 ohms it is 100W (at max voltage and current), and into 2 ohms it is back down to 50W (current limited 10V 5A). In reality it is a bit more complicated than this but you get the idea.

 

[MichaelAngelo]

Thanks for all the replies.
Cam, 1 amp is the AVA 250, one is the Parts Express amp. They each run a 15inch square Solobaric sub, (got them for my ext cab truck, but movies have such impact I may have to get others for the truck, unless I can get a better HT sub.)
Michael, I see your point. Hwever, there may be a bit of a gain from 4 to 2 ohms with these amps, I have 2 12 inch Solobaric squares, DVC @2ohm ea, and they def play louder at 2 ohm than 4. BUT there is a bit of heat on the fins, I have them mounted in the wall to reach the controls, and I have a small tube ducting cool AC air over the fins.
I don't often have the opportunity to play these at full vol, but the gain can stay at full, and I can turn up some rap like Biggie, or classical like YoYo, or the 5hz stuff from Liszt, it m o v e s you, I read on this forum about U-571, popped it in Sunday, WOW, stuff was falling off the shelves lol. Both amps are modded w 100kohm resistors for 12hz corner freq.(r27)
FWIW, the amps will hook up and play at 1 ohm, tested it on the 12s. But theres a lot more heat, and I didn't want to sacrifice an amp to find the limits.

 

[Chris Tsutsui]

Michael I get your point, but there are also many amplifiers that are factory rated at 4 ohms but can also run at 2 ohm loads. (Just not as stable)

An example is the Alpine MRV-1507 which is rated at 900w RMS 4ohm but known for it's capable output of 1500w RMS 2ohm.

I guess the only real way we'll know is if someone familiar with the amp could shed some light or run an output measurement.