yo my buddy has a jl audio 500/1 monoblock amp..brand spankin new.....we hooked it up to a single punch hx2 15 dvc 4ohm .....ran series so the amp should be seeing 8 ohms ..correct?....should function safe at 8ohms right..??...we ran series because the speaker was already mounted in the box and he didnt wanna take the time to run the wires paralell...anyway it played fine for about 10 mins....then all of a sudden the speaker sounds blown....so we checked the connections ..ground ..rca.....everything...tested the speaker with another amp identical to that one and it works fine....the amp has an indicator light on it that displays low ohms...and when u first turn it on the thermal light flashes for a split second......then the speaker plays good for about 2 seconds and then the low ohms light comes one and it sounds blown...what the deal here ...anyone know?
Replies (8)
trunkisloud on 11/21/2005 18:15:59
also tried other speakers on this amp and they sound blown as well
Ash on 11/21/2005 20:12:42
Have you fully read the owner's manual before hooking it up? These are not your everyday "run of the mill" amps. They are pretty complex designs that include an extensive setup prodcedure according to manual. In fact they are only rated between 1.5 to 4 ohms. So I suggest reading the manual again before crossing it out as bad. If you don't have one go to this link:
http://mobile.jlaudio.com/pdfs/6986.pdf
swez on 11/21/2005 20:16:01
Amp is not working properly. If it's under warranty, have it checked or replace same.
Also, this amp is designed for 1.5 - 4.0 ohms. The sub is now wired for 8 ohms. The amp should handle that load, but output will be about half what it is capable of. If you get another 500/1, pull the sub and wire it for 2 ohms.
Swez
P0werLifter on 11/21/2005 20:32:03
"..we ran series because the speaker was already mounted in the box and he didnt wanna take the time to run the wires paralell"
My personal opinion, if your not going to take the time to set it up correctly, and make sure things are done right, dont be supprized when things go wrong.
Allways take the time to make sure things are wired corretly otherwise you run the risk of blowing/frying equipment that would have otherwise ran perfect.
My suggestion is read the manual, and wire the sub to match the amplifiers rated ohm load. JL Audio makes high quality gear, that are complex in design and manufactured to handle a wide ohm load. If things check out, rewire the woofer to 2ohm load for that amplifier. Will work out better for both amp, and subwoofer. Then adjust the gain
-PL
swez on 11/22/2005 19:29:05
Normally, an 8 ohm load should not hurt most mosfet amps. Yes, the power they will deliver to your speakers/subs will be less than at 4 ohms, but normally, it should not damage most amps.
I did check the manual for info on 8 ohm loads. (or loads higher than 4 ohms) The amp will work with higher impedance loads, at reduced output. (No problem here, just not efficient use of the amp.
Finally, if your friend does not have the manual, here's the link to get a copy off JL's website: Read & heed!
http://mobile.jlaudio.com/pdfs/6986.pdf
Swez
Ash on 11/23/2005 21:35:55
Did you ever get this one figured out? The manual didn't say it wouldn't run a 8 ohm load. It only state it's rated power output is the same between 1.5 - 4 ohms. Hopefully your buddy can get it replaced under warranty.....
MrBrownstone on 11/23/2005 21:41:57
the amp will run under 8 ohms, just won't put out much as that load will confuse the circuitry.
As far as running that amp on other speakers, it's only designed for subwoofers. What frequency are you setting the crossover? subsonic filter? How about the 0/180 phase button?
It could be the speaker, but we need to know what other speakers you are trying to use with the same amp?
swez on 11/23/2005 22:04:40
Right you are Mr. B. Class D amp has limited frequency range. (usually 200 - 400 Hz is what they do best) How they sound on full range speakers is not what they can do at sub and MB frequencies.
It's possible your friend got a dud. Not that common with JL amps, but anything can happen, once in a while. It would be best to have the amp checked out by a qualified LJ tech. Then look for options noted above.
Swez
Replies (8)
trunkisloud on 11/21/2005 18:15:59
also tried other speakers on this amp and they sound blown as well
Ash on 11/21/2005 20:12:42
Have you fully read the owner's manual before hooking it up? These are not your everyday "run of the mill" amps. They are pretty complex designs that include an extensive setup prodcedure according to manual. In fact they are only rated between 1.5 to 4 ohms. So I suggest reading the manual again before crossing it out as bad. If you don't have one go to this link:
http://mobile.jlaudio.com/pdfs/6986.pdf
swez on 11/21/2005 20:16:01
Amp is not working properly. If it's under warranty, have it checked or replace same.
Also, this amp is designed for 1.5 - 4.0 ohms. The sub is now wired for 8 ohms. The amp should handle that load, but output will be about half what it is capable of. If you get another 500/1, pull the sub and wire it for 2 ohms.
Swez
P0werLifter on 11/21/2005 20:32:03
"..we ran series because the speaker was already mounted in the box and he didnt wanna take the time to run the wires paralell"
My personal opinion, if your not going to take the time to set it up correctly, and make sure things are done right, dont be supprized when things go wrong.
Allways take the time to make sure things are wired corretly otherwise you run the risk of blowing/frying equipment that would have otherwise ran perfect.
My suggestion is read the manual, and wire the sub to match the amplifiers rated ohm load. JL Audio makes high quality gear, that are complex in design and manufactured to handle a wide ohm load. If things check out, rewire the woofer to 2ohm load for that amplifier. Will work out better for both amp, and subwoofer. Then adjust the gain
-PL
swez on 11/22/2005 19:29:05
Normally, an 8 ohm load should not hurt most mosfet amps. Yes, the power they will deliver to your speakers/subs will be less than at 4 ohms, but normally, it should not damage most amps.
I did check the manual for info on 8 ohm loads. (or loads higher than 4 ohms) The amp will work with higher impedance loads, at reduced output. (No problem here, just not efficient use of the amp.
Finally, if your friend does not have the manual, here's the link to get a copy off JL's website: Read & heed!
http://mobile.jlaudio.com/pdfs/6986.pdf
Swez
Ash on 11/23/2005 21:35:55
Did you ever get this one figured out? The manual didn't say it wouldn't run a 8 ohm load. It only state it's rated power output is the same between 1.5 - 4 ohms. Hopefully your buddy can get it replaced under warranty.....
MrBrownstone on 11/23/2005 21:41:57
the amp will run under 8 ohms, just won't put out much as that load will confuse the circuitry.
As far as running that amp on other speakers, it's only designed for subwoofers. What frequency are you setting the crossover? subsonic filter? How about the 0/180 phase button?
It could be the speaker, but we need to know what other speakers you are trying to use with the same amp?
swez on 11/23/2005 22:04:40
Right you are Mr. B. Class D amp has limited frequency range. (usually 200 - 400 Hz is what they do best) How they sound on full range speakers is not what they can do at sub and MB frequencies.
It's possible your friend got a dud. Not that common with JL amps, but anything can happen, once in a while. It would be best to have the amp checked out by a qualified LJ tech. Then look for options noted above.
Swez
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