Fosgate P250.2 w/ 10" Punch P1 problem

wpc · 28th May 2009, 03:46 PM

I had an issue yesterday that sounded like the speaker voice coil got burned. I just downloaded one of those speaker test mp3's and was playing it in the car and heard some crackly sounds from the sub so I turned it back down. After that when the volume was down low it sounded very bad but when you turn it up high it would sound normal.

Today I drove the car to work and it sounded the same so I turned up the juice so I don't have to hear the bad sounding sub (so I thought) but then the sub started to sound normal. I can now listen at low or high volume and the sub sounds fine!

What could this be a problem with? The amp or sub? Any input would be appreciated. thank you.

FYI - it was one of the mp3's from http://www.stealthsettings.com/woofe...er-sound-test/

Johnny Lee

wpc · 28th May 2009, 05:31 PM

FYI. I have the schematic for the P250.2 amp if anyone needs/wants it. Just email me. Not sure if we're allowed to post those schematics.

Perry Babin · 28th May 2009, 06:23 PM

You need to try the speaker with a different amp or (or a different speaker on your amp) to determine which one is faulty.

wpc · 1st June 2009, 05:56 AM

thanks, looks like it was indeed the speaker. after I was thumping it more for a few days it finally took a dive. Now the speaker is frozen. When I push it upwards I can see the voice coil unwrapping itself. Lots of fun!

wpc · 2nd June 2009, 02:02 PM

Well, this is sort of off topic but it's a result of the topics problem.

Sub is dead. Someone gave me a JL 10" W3-D4 (4ohm dual voice coil). Problem is the P250.2 does 250w bridged @ 4ohm stable.

The only thing I can do is run it at 8ohm which would be 125w?

When an amp typically says 4ohm stable I know it definitely means don't run it at 2ohms but is it ok to run it @ 8ohms?

0ldSch00lf00l · 2nd June 2009, 03:12 PM

You will be fine at 8 ohms.

ETA: You should get a little more than 125 watts @ 8 ohms because Rockford Fosgate still tends to under rate their amps by 20%. To get better idea of how much power you you should be making at 8 ohms mono, look at your 4 ohm stereo power on the birthsheet and add it up to derive your 8 ohm mono output. For example, if your 4 ohm stereo power is 75 watts per channel, your 8 ohm mono power would be 150 watts.

wpc · 2nd June 2009, 06:28 PM

Rated Power
continuous power 60W x 2 @ 4 Ohms RMS
125W x 2 @ 2-Ohms RMS
250W x 1 @ 4-Ohms bridged RMS

so I only get 120w? rofl

Well, 120w + 20%? so 144w?

Oh well, I guess I'll sell this amp and use my fosgate 400a4 bridged.
Should give me 200w x 2 for each voice coil of this sub.
I believe the JL 10W3-D4 can take 300w rms.

thanks for your help!

marchel · 15th June 2009, 04:29 AM

HI ,

Have you tried the P250.2 to the 10w3 yet, How do thy sound?

Cause I'm considering buying a p250.2 for my modest system, for sub duty.

wpc · 15th June 2009, 04:49 AM

considering i was only running 120/125w @ 8 ohm it sounded great. more than enough bass i think, Someone gave me an old school 12" solobaric 4ohm for free so i am running that now @ 250w. If you are getting the w3 get 2 ohm dvc or a svc 4ohm

marchel · 15th June 2009, 01:28 PM

HI wpc,

I saw a birth sheet of a p250.2 and it says 93W at 14.4V , Therefore you should be getting between 120W to 186W rms , depending on the voltage supply, when bridged to 8 ohms.

Lucky you , For the subs you received

.

BTW , What do you think is the better sounding of the 2 subs you received?

28th May 2009, 03:46 PM	#1
wpc diyAudio Member Join Date: May 2009	Fosgate P250.2 w/ 10" Punch P1 problem I had an issue yesterday that sounded like the speaker voice coil got burned. I just downloaded one of those speaker test mp3's and was playing it in the car and heard some crackly sounds from the sub so I turned it back down. After that when the volume was down low it sounded very bad but when you turn it up high it would sound normal. Today I drove the car to work and it sounded the same so I turned up the juice so I don't have to hear the bad sounding sub (so I thought) but then the sub started to sound normal. I can now listen at low or high volume and the sub sounds fine! What could this be a problem with? The amp or sub? Any input would be appreciated. thank you. FYI - it was one of the mp3's from http://www.stealthsettings.com/woofe...er-sound-test/ Johnny Lee

28th May 2009, 06:23 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You need to try the speaker with a different amp or (or a different speaker on your amp) to determine which one is faulty. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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28th May 2009, 05:31 PM	#2
wpc diyAudio Member Join Date: May 2009	FYI. I have the schematic for the P250.2 amp if anyone needs/wants it. Just email me. Not sure if we're allowed to post those schematics.

1st June 2009, 05:56 AM	#4
wpc diyAudio Member Join Date: May 2009	thanks, looks like it was indeed the speaker. after I was thumping it more for a few days it finally took a dive. Now the speaker is frozen. When I push it upwards I can see the voice coil unwrapping itself. Lots of fun!

2nd June 2009, 02:02 PM	#5
wpc diyAudio Member Join Date: May 2009	Well, this is sort of off topic but it's a result of the topics problem. Sub is dead. Someone gave me a JL 10" W3-D4 (4ohm dual voice coil). Problem is the P250.2 does 250w bridged @ 4ohm stable. The only thing I can do is run it at 8ohm which would be 125w? When an amp typically says 4ohm stable I know it definitely means don't run it at 2ohms but is it ok to run it @ 8ohms?

2nd June 2009, 03:12 PM	#6
0ldSch00lf00l diyAudio Member Join Date: Aug 2008 Location: Lafayette, Louisiana	You will be fine at 8 ohms. ETA: You should get a little more than 125 watts @ 8 ohms because Rockford Fosgate still tends to under rate their amps by 20%. To get better idea of how much power you you should be making at 8 ohms mono, look at your 4 ohm stereo power on the birthsheet and add it up to derive your 8 ohm mono output. For example, if your 4 ohm stereo power is 75 watts per channel, your 8 ohm mono power would be 150 watts.

2nd June 2009, 06:28 PM	#7
wpc diyAudio Member Join Date: May 2009	Rated Power continuous power 60W x 2 @ 4 Ohms RMS 125W x 2 @ 2-Ohms RMS 250W x 1 @ 4-Ohms bridged RMS so I only get 120w? rofl Well, 120w + 20%? so 144w? Oh well, I guess I'll sell this amp and use my fosgate 400a4 bridged. Should give me 200w x 2 for each voice coil of this sub. I believe the JL 10W3-D4 can take 300w rms. thanks for your help!

15th June 2009, 04:29 AM	#8
marchel diyAudio Member Join Date: Nov 2007	HI , Have you tried the P250.2 to the 10w3 yet, How do thy sound? Cause I'm considering buying a p250.2 for my modest system, for sub duty.

15th June 2009, 04:49 AM	#9
wpc diyAudio Member Join Date: May 2009	considering i was only running 120/125w @ 8 ohm it sounded great. more than enough bass i think, Someone gave me an old school 12" solobaric 4ohm for free so i am running that now @ 250w. If you are getting the w3 get 2 ohm dvc or a svc 4ohm

15th June 2009, 01:28 PM	#10
marchel diyAudio Member Join Date: Nov 2007	HI wpc, I saw a birth sheet of a p250.2 and it says 93W at 14.4V , Therefore you should be getting between 120W to 186W rms , depending on the voltage supply, when bridged to 8 ohms. Lucky you , For the subs you received . BTW , What do you think is the better sounding of the 2 subs you received?