hey fellas,
well, my buddy got that JBL 600.1 amp. he is trying to push two type-r 4 ohm DVC subs, and we wired it in parallel to carry a 1 ohm load. now, it bangs real loud, but the amp cuts off after a couple minutes. it is running at 1 ohm, and the box and every one i've talked to say that it is 1 ohm stable.
why is this thing cutting off?? me and the guys at circuit city are totally stumped. his fuse under the hood blew once when the amp didn't shut itself off, and the plastic fuse holder melted. right now, we have it wired for 4 ohms just so it will play, but it isn't nearly as loud.
could it be his car?? any suggestions will be appreciated.
-UK
Replies (11)
UKinstaller on 07/18/2004 22:58:49
BTW, i tested his subs and neither are blown. also, as far as i know, the amp is good. it was brand new, out of the box. i also measured the ohm reading at the terminal of each speaker and both read 2 ohms.
-UK
cplkittle on 07/19/2004 01:01:13
what size wire is he using to supply the amplifier? if it is too small it could cause excess heat within the amplifier. Also, check the voltage at the amplifier with it running, if the voltage drops below 9-10v, the amp will shut off to avoid damage. This could be the sign of a weak alternator. When alternators go bad, they don't just quit completely, they start dropping in the voltage output until all of the wires inside basically melt into.
Also check the ground, this is the cause of 75% of all problems electrical.
cplkittle on 07/19/2004 01:03:03
In your last post you stated that at the terminals, the speaker read 2 ohms... Did you mean to say they tested at 2 ohms when wired parallel, or is this a 2ohm DVC sub?
UKinstaller on 07/19/2004 10:48:50
they read 2 ohms when wired in parallel.
i was thinking, what if i just don't wire up his DVC, run them as SVC, then if i ran them in parallel it would net a 2 ohm load instead of 1 ohm. the power output on this amp is 600 RMS at both 1 and 2 ohms. would that work if i can't figure out anything else??
-UK
UKinstaller on 07/19/2004 10:50:56
oh yeah, he's using 4 gauge wire.
-UK
cplkittle on 07/19/2004 18:51:58
I would not recommend using only one voice coil, they are smaller on DVC subs than on SVC subs, and you lose controll of the excursion this way. The size in length of a SVC sub's coil is longer than one coil on a DVC sub.
swez on 07/19/2004 20:17:58
Check the gain settings on that amp as well. If the gain is set too low, (under 1.0 volts) the amp will put out more power than is rated , but will go into protect mode when pushed hard at 1 ohm. You know this is the case if the amp cover feels unually warm when it shuts off.
Also, #4 gage is right for this amp. It will draw about 57A at full potential. However, if the gain settings are too low, the amp may draw more current than it is designed for as voltage drops from the ALT/BAT. Low voltage causes an amp to pull more current and that might explain the melted fuse holder. How large a fuse is in that holder? It should be at least 60A if only the JBL is connected to it. If there is another amp on that line too... a larger fuse and wire should be used... depending on the other amp power draw.
DO NOT RUN THESE SUBS AS SVC's. They cannot handle the power you have coming from the JBL amp this way. Special wiring techniques are needed to bleed off electromagnetic field energy that develops in the passive coil(s). Without bleeding off that energy, would cause a "bucking" force that could damage the subs.
Swez
PS Make sure your ground is to bare metal as mentioned by Kittle.
ttocs on 07/19/2004 22:30:37
how hot is it? At 1 ohm it will generate alot of heat, and in a trunk in the summer it could go into thermal protection....
UKinstaller on 07/20/2004 08:50:22
well yesterday he went to circuit city (not the one i work at) and he returned his DVC type-r's for two SVC MTX subs, they are the newest MTX 12's. we hooked those up a few minutes ago and they are pounding, but at 2 ohms rather than 1 ohm. it hasn't shut off yet (knock on wood)
however.......
after we hooked it up, there was smoke coming out of the high level inputs on the amp!! him having the impatience that he does, he said as long as the amp was working, he didn't care. so right now, he is driving around letting em rip and seeing what will happen.
man, this post goes to show how little i know beyond installation itself. i know nothing about wiring subs, even though i did his right because i followed a diagram in the "Car Stereo Cookbook". i need to learn more about wiring all types of subs. at least now i know that you cannot wire a DVC sub as SVC. good thing i didn't try that eh??
any ideas on the smoke, or what we should do with it?? i am SURE that it is running at 2 ohms.
-UK
SeVeNX7X on 07/21/2004 09:23:35
i have an idea on the smoke.. stop using it. Any smoke = bad thing. He's gonna be sorry when the amp bursts into flames and burns his car to the ground.
swez on 07/21/2004 10:20:22
Something is not right here... letting out the "magic smoke" INSIDE AN AMP IS ALWAYS BAD NEWS. I think your friend will experience an amp melt down very soon. Hope he has a return policy where he got the amp.
Swez
well, my buddy got that JBL 600.1 amp. he is trying to push two type-r 4 ohm DVC subs, and we wired it in parallel to carry a 1 ohm load. now, it bangs real loud, but the amp cuts off after a couple minutes. it is running at 1 ohm, and the box and every one i've talked to say that it is 1 ohm stable.
why is this thing cutting off?? me and the guys at circuit city are totally stumped. his fuse under the hood blew once when the amp didn't shut itself off, and the plastic fuse holder melted. right now, we have it wired for 4 ohms just so it will play, but it isn't nearly as loud.
could it be his car?? any suggestions will be appreciated.
-UK
Replies (11)
UKinstaller on 07/18/2004 22:58:49
BTW, i tested his subs and neither are blown. also, as far as i know, the amp is good. it was brand new, out of the box. i also measured the ohm reading at the terminal of each speaker and both read 2 ohms.
-UK
cplkittle on 07/19/2004 01:01:13
what size wire is he using to supply the amplifier? if it is too small it could cause excess heat within the amplifier. Also, check the voltage at the amplifier with it running, if the voltage drops below 9-10v, the amp will shut off to avoid damage. This could be the sign of a weak alternator. When alternators go bad, they don't just quit completely, they start dropping in the voltage output until all of the wires inside basically melt into.
Also check the ground, this is the cause of 75% of all problems electrical.
cplkittle on 07/19/2004 01:03:03
In your last post you stated that at the terminals, the speaker read 2 ohms... Did you mean to say they tested at 2 ohms when wired parallel, or is this a 2ohm DVC sub?
UKinstaller on 07/19/2004 10:48:50
they read 2 ohms when wired in parallel.
i was thinking, what if i just don't wire up his DVC, run them as SVC, then if i ran them in parallel it would net a 2 ohm load instead of 1 ohm. the power output on this amp is 600 RMS at both 1 and 2 ohms. would that work if i can't figure out anything else??
-UK
UKinstaller on 07/19/2004 10:50:56
oh yeah, he's using 4 gauge wire.
-UK
cplkittle on 07/19/2004 18:51:58
I would not recommend using only one voice coil, they are smaller on DVC subs than on SVC subs, and you lose controll of the excursion this way. The size in length of a SVC sub's coil is longer than one coil on a DVC sub.
swez on 07/19/2004 20:17:58
Check the gain settings on that amp as well. If the gain is set too low, (under 1.0 volts) the amp will put out more power than is rated , but will go into protect mode when pushed hard at 1 ohm. You know this is the case if the amp cover feels unually warm when it shuts off.
Also, #4 gage is right for this amp. It will draw about 57A at full potential. However, if the gain settings are too low, the amp may draw more current than it is designed for as voltage drops from the ALT/BAT. Low voltage causes an amp to pull more current and that might explain the melted fuse holder. How large a fuse is in that holder? It should be at least 60A if only the JBL is connected to it. If there is another amp on that line too... a larger fuse and wire should be used... depending on the other amp power draw.
DO NOT RUN THESE SUBS AS SVC's. They cannot handle the power you have coming from the JBL amp this way. Special wiring techniques are needed to bleed off electromagnetic field energy that develops in the passive coil(s). Without bleeding off that energy, would cause a "bucking" force that could damage the subs.
Swez
PS Make sure your ground is to bare metal as mentioned by Kittle.
ttocs on 07/19/2004 22:30:37
how hot is it? At 1 ohm it will generate alot of heat, and in a trunk in the summer it could go into thermal protection....
UKinstaller on 07/20/2004 08:50:22
well yesterday he went to circuit city (not the one i work at) and he returned his DVC type-r's for two SVC MTX subs, they are the newest MTX 12's. we hooked those up a few minutes ago and they are pounding, but at 2 ohms rather than 1 ohm. it hasn't shut off yet (knock on wood)
however.......
after we hooked it up, there was smoke coming out of the high level inputs on the amp!! him having the impatience that he does, he said as long as the amp was working, he didn't care. so right now, he is driving around letting em rip and seeing what will happen.
man, this post goes to show how little i know beyond installation itself. i know nothing about wiring subs, even though i did his right because i followed a diagram in the "Car Stereo Cookbook". i need to learn more about wiring all types of subs. at least now i know that you cannot wire a DVC sub as SVC. good thing i didn't try that eh??
any ideas on the smoke, or what we should do with it?? i am SURE that it is running at 2 ohms.
-UK
SeVeNX7X on 07/21/2004 09:23:35
i have an idea on the smoke.. stop using it. Any smoke = bad thing. He's gonna be sorry when the amp bursts into flames and burns his car to the ground.
swez on 07/21/2004 10:20:22
Something is not right here... letting out the "magic smoke" INSIDE AN AMP IS ALWAYS BAD NEWS. I think your friend will experience an amp melt down very soon. Hope he has a return policy where he got the amp.
Swez
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