I Have a JLB PX600.2 (a 2 channel amp) CEA Compliant at 300 watts at 2ohms per channel. I Have it running 2 6x9s in the back and 2 5 1/4s in the front. The 6x9s are rated at 100 watts rms and 300 peak. the 5 1/4 are rated at 45 watts rms and 135 peak; the speakers are also JBL. This is what happend, the front speakers stoped working compleatly, then i took one out it was HOT. One of the back speakers, the woofer was like stuck or something but the tweeters stills worked, and the other one worked but sounds like s@#$. did this happen because i was over powering the speakers too much, or not enough? would i do better if i ran the amp at 600 watts at 4ohms bridged or what. i would like to know so i dont mess up my new speakers.
Replies (3)
compvr15s on 10/13/2005 02:25:49
did you paralell the speakers, front and rear left on one channel and front and rear right on the other channel... if so your gain settings were probably way too high, too much boost, inproper xover settings, ect.... but if i had to guess you blew your speakers due to over powering them, its great if you can have clean power to you speakers but they can only handle so much... tryin to run 300 watts into a load than only needs 145 to perfrom at its best is probably the demise of your speakers hear.... if it was me i would opt for a lesser powered 4 channel amp, 50-75 watts rms per channel and wire each speaker to its own channel... and then use the jbl for your sub application or try to sell it and go from there.... if you do decide to use this amp just make sure you set the amp correctly... if you are running the 4 speaks off of the two channels make sure to set the cross over to accomidate the smaller speaker... your 6x9s will be able to go lower in the freq range than the 5 1/4s. so set it so the 5.25s are not getting too much bass.. or you can set it for the 6x9s and then buy bass filter to run inline with your 5.25s. this way would probably work better, but will cost you probably about 10-15 bucks... any other questions just ask
swez on 10/13/2005 08:53:12
That amp is way too strong for most 5.25" format speakers. A few 6x9's can take that kind of power, (150 Wrms) but only when they have an enclosure to provide some back pressure to the speakers' suspension system.
As CompVR said, settings on your crossovers also make a difference too. Most 6x9's can handle down to 60 Hz well enough. However, the 5.25's cannot do much power below about 80 Hz. Running the amp at rated power, no crossover filtering and a few dB of bass boost will kill most any normal speakers in short order. This amp is better for powering subs or very strong full range speakers.
NOTE: This amp is rated at 300 watts RMS x 2 into 2 ohm loads. Your speakers' RMS ratings are well below that number. Look at the RMS power numbers, not peak power. (ALWAYS) This will tell you how much continous power the speakers can take, on a sustained basis.
Finally, if you plan to use this amp for new full range speakers, the amp output section will need to be matched to the speakers power handling (RMS) specs. Once you have a handle on speakers you wish to use, come back and we can help you figure out a few ways to match amping power to speakers.
Swez
PS Sorry to hear you blew your speakers. But there is a way to fix that next time.
lessismorespl on 10/13/2005 14:21:13
Ifyou do not want to mess up your new speakers, get yourself a new amp. That was way too much power for those speakers. The woofers was "stuck" b/c the voice coils literally melted to the suspension of the woofer. You need to get a nice 4 channel amp, 50-75 wRMS per channel @ 4ohms.
less
Replies (3)
compvr15s on 10/13/2005 02:25:49
did you paralell the speakers, front and rear left on one channel and front and rear right on the other channel... if so your gain settings were probably way too high, too much boost, inproper xover settings, ect.... but if i had to guess you blew your speakers due to over powering them, its great if you can have clean power to you speakers but they can only handle so much... tryin to run 300 watts into a load than only needs 145 to perfrom at its best is probably the demise of your speakers hear.... if it was me i would opt for a lesser powered 4 channel amp, 50-75 watts rms per channel and wire each speaker to its own channel... and then use the jbl for your sub application or try to sell it and go from there.... if you do decide to use this amp just make sure you set the amp correctly... if you are running the 4 speaks off of the two channels make sure to set the cross over to accomidate the smaller speaker... your 6x9s will be able to go lower in the freq range than the 5 1/4s. so set it so the 5.25s are not getting too much bass.. or you can set it for the 6x9s and then buy bass filter to run inline with your 5.25s. this way would probably work better, but will cost you probably about 10-15 bucks... any other questions just ask
swez on 10/13/2005 08:53:12
That amp is way too strong for most 5.25" format speakers. A few 6x9's can take that kind of power, (150 Wrms) but only when they have an enclosure to provide some back pressure to the speakers' suspension system.
As CompVR said, settings on your crossovers also make a difference too. Most 6x9's can handle down to 60 Hz well enough. However, the 5.25's cannot do much power below about 80 Hz. Running the amp at rated power, no crossover filtering and a few dB of bass boost will kill most any normal speakers in short order. This amp is better for powering subs or very strong full range speakers.
NOTE: This amp is rated at 300 watts RMS x 2 into 2 ohm loads. Your speakers' RMS ratings are well below that number. Look at the RMS power numbers, not peak power. (ALWAYS) This will tell you how much continous power the speakers can take, on a sustained basis.
Finally, if you plan to use this amp for new full range speakers, the amp output section will need to be matched to the speakers power handling (RMS) specs. Once you have a handle on speakers you wish to use, come back and we can help you figure out a few ways to match amping power to speakers.
Swez
PS Sorry to hear you blew your speakers. But there is a way to fix that next time.
lessismorespl on 10/13/2005 14:21:13
Ifyou do not want to mess up your new speakers, get yourself a new amp. That was way too much power for those speakers. The woofers was "stuck" b/c the voice coils literally melted to the suspension of the woofer. You need to get a nice 4 channel amp, 50-75 wRMS per channel @ 4ohms.
less
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