Fosgate P250.2 bridged @ 2ohm safe?

wpc · 5th June 2009, 04:41 PM

How safe is it to run a P250.2 in bridge mode @ 2ohm? Even if I turn down the juice? I got a free JL 10W3-DVC(4ohm x2) so I have to run it at 2ohm or 8ohm. If I turn down the gain is it safe to run the amp bridged and at 2ohm?

Thanks

Perry Babin · 5th June 2009, 04:50 PM

In general, no. If you need the extra power that the 2 ohm load would produce, it's likely that you will drive the amp too hard which is likely to make it fail. If you don't need the extra power, run it at 8 ohms mono (4 ohms stereo).

wpc · 5th June 2009, 04:57 PM

I actually would like the sub to be 4ohm! Then it would be perfect.

sub = 300w rms w/ 2x 4ohm voice coils
amp = 250w rms @ 4ohm

Maybe I'll have to just get a new sub... oh well.

chris661 · 5th June 2009, 05:47 PM

You wouldn't lose much by setting it as 8ohm.

Remeber - you will only lose 3dB, which isn't a staggeringly huge number.

At 2 ohm, the amp would try to put 500W through it. The circuitry, PSU etc aren't rated that high, so the amp would fair, a while after the burning smell which we all know so well will come along, and you'll need a new amp (take this from someone who got over 100W out of a 50W amp, until the smells came).

Alternatively, feed both channels of the amp with a mono input, then plug one channel into each coil (make sure the + and - are the right way), which would do what you're after, at a safer load.

Running the amp in bridged into 8ohms will make each side see 4 ohms (don't ask how) so you should end up Ok.

wpc · 5th June 2009, 06:52 PM

I wish I could

I tried a few configurations..

Amp Bridged @ 4ohm (250w) / Sub @ 8ohm (125w)
Amp Stereo @ 2ohm (125w) / Sub @ 2ohm (125w)
Amp Stereo @ 4 ohm (60w) x2 / Sub @ 4ohm (60w) x 2

They all end up with 125w in the end. I think they all actually sound the same. There's a slight chance that the bridged and sub @ 8ohm sounded a little better.

5th June 2009, 04:41 PM	#1
wpc diyAudio Member Join Date: May 2009	Fosgate P250.2 bridged @ 2ohm safe? How safe is it to run a P250.2 in bridge mode @ 2ohm? Even if I turn down the juice? I got a free JL 10W3-DVC(4ohm x2) so I have to run it at 2ohm or 8ohm. If I turn down the gain is it safe to run the amp bridged and at 2ohm? Thanks

5th June 2009, 04:50 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	In general, no. If you need the extra power that the 2 ohm load would produce, it's likely that you will drive the amp too hard which is likely to make it fail. If you don't need the extra power, run it at 8 ohms mono (4 ohms stereo). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th June 2009, 05:47 PM	#4
chris661 diyAudio Member Join Date: Feb 2008 Location: Lancashire Blog Entries: 7	You wouldn't lose much by setting it as 8ohm. Remeber - you will only lose 3dB, which isn't a staggeringly huge number. At 2 ohm, the amp would try to put 500W through it. The circuitry, PSU etc aren't rated that high, so the amp would fair, a while after the burning smell which we all know so well will come along, and you'll need a new amp (take this from someone who got over 100W out of a 50W amp, until the smells came). Alternatively, feed both channels of the amp with a mono input, then plug one channel into each coil (make sure the + and - are the right way), which would do what you're after, at a safer load. Running the amp in bridged into 8ohms will make each side see 4 ohms (don't ask how) so you should end up Ok. __________________ "Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo My setup: http://www.diyaudio.com/forums/multi...tang-band.html

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5th June 2009, 04:57 PM	#3
wpc diyAudio Member Join Date: May 2009	I actually would like the sub to be 4ohm! Then it would be perfect. sub = 300w rms w/ 2x 4ohm voice coils amp = 250w rms @ 4ohm Maybe I'll have to just get a new sub... oh well.

5th June 2009, 06:52 PM	#5
wpc diyAudio Member Join Date: May 2009	I wish I could I tried a few configurations.. Amp Bridged @ 4ohm (250w) / Sub @ 8ohm (125w) Amp Stereo @ 2ohm (125w) / Sub @ 2ohm (125w) Amp Stereo @ 4 ohm (60w) x2 / Sub @ 4ohm (60w) x 2 They all end up with 125w in the end. I think they all actually sound the same. There's a slight chance that the bridged and sub @ 8ohm sounded a little better.

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