I have blown the internal amp on two head units in my car. Can you guys give me some examples on how they are blown, cus I am clueless. I put connectors and tape on all my connections. I do have subs hooked up through the RCA's, if those possibly do somethin to the internal amp. I have no clue. Its an extremely expensive problem to have though.
Replies (12)
swez on 05/1/2005 23:18:18
Internal amps usually blow due to shorted wires to ground. Look into your speaker wiring ohmic readings to each channel on the HU. Measure the ohmic load on all speaker wires to HU. They should read just under 4 ohms to each speaker. If you get a flier that is well under 2 ohms, potential short here.
Also, make sure the Neg wires are not grounded to body during install. Most/all new HU's are floating ground systems. They should not be grounded to car metal parts.
Swez
ttocs on 05/2/2005 00:13:17
please be more specific.. You have the subs X hooked up through the rca outputs to X amp in X car.
Please include as much detail as possable in make models, color of the car, tires and air pressure, aaaannnnddd a pic of yer girl if ya got one..
Just kidding, but please read the let us help you article on the home page after signing in. Welcome to the forum, we have alot of people that can help alot......
Black_Rob on 05/2/2005 01:29:42
Swez ... i didnt have covers on the connections to one of my back speakers. I just had the raw metal clips on the connectors. If the raw connection touched the metal on the surface where the speaker is placed on, this could cause it to short/blow?
HU: JVC KD-LH3100
swez on 05/2/2005 09:11:04
If they shorted together or to ground, good possibility it will blow the internal amps on the HU.
As ttocs mentioned, more details are most helpful. Give this a good read before your next post OK?
http://www.clubknowledge.com/Car_Audio_FAQ/
Swez
ttocs on 05/2/2005 14:16:59
if the leads touched, hopefully the amp would shut off to keep this from happening. If one of the leads is still shorted, this could be your problem. Always make sure there is no bare wire and that tape is an insulator, not a connector.
Black_Rob on 05/3/2005 02:59:09
Just to narrow down the possibilities ...
Are there any ways that I could have blown the internal amp from something that happenend with my Subwoofers (pre amp outputs), or are those 2 completely seperate departments. I just want to narrow down the possibilities. If i can count out the subwoofers and amps, then im just going to rewire my entire car with new speaker wire.
swez on 05/3/2005 10:16:33
Subs are on a preamp circuit out of the HU if you are using RCA's. That's a separate circuit then internal amps off the HU.
If you have RCA outs form the HU and the rest of the HU is still working properly, can run a set of amps off the RCA's. From what I see on that HU, you have 3 pairs of RCA's. Front/Rear and sub outs. Each are capable of 2 volts. If they are working properly, can add a 4 channel amp to power the interior speakers and leave sub system as is. The main thing here... make sure your speakers are not shorted or have blown open coils. New wires from the 4 channel amp to each speaker are a good idea. Use #14-16 gage wire there.
Swez
PS Hopefully, the electricals in this vehicle are stong enough to support both amps. What do you have now for a vehicle and give details on your present sub amp.
ttocs on 05/3/2005 13:52:24
does the deck smell smoked?
Black_Rob on 05/10/2005 22:23:15
What are "blown open coils" .. How can i tell if I have one. Can this occur w/o the speaker sounding terrible?
My car is a 1992 Honda Accord.
I have 2 kenwood amps that are 300rms at 14.4V
2 15" MTX Thunder 6000's
Can you recommend some cheap 4-channel amps that would give me decent sound. Im not looking for anything much better than a factory quality interior speaker sound.
ttocs on 05/11/2005 09:43:11
the coil is the internal motor of the speaker. It is just a piece of wire wrapped up into a coil. When you blow a speaker it often will burn the coil making the speaker stop working. You can test this with an ohm meter to check impedence, or often by just trying to push the speaker in. If it is blown often it will make a heavy scrapping sound when it moves.
swez on 05/11/2005 21:16:40
Ttocs is correct... if the coils are blown open, no sound at all. If you measured the wire lugs with an ohmeter, the meter would read "0" ohms or infinite on analog meters.
If the speakers are damaged from excess heat or power, you can hear scraping noises as you manually motivate the cones in and out. That's usually a burned coil that did not fully separate.
The main thing, test the speakers with a known good audio source. If they sound clear and clean at moderate power, probably OK.
Swez
ttocs on 05/11/2005 23:16:18
you can often smell if they are burned.... Let out the magik smoke and the electronics will stop working.
Replies (12)
swez on 05/1/2005 23:18:18
Internal amps usually blow due to shorted wires to ground. Look into your speaker wiring ohmic readings to each channel on the HU. Measure the ohmic load on all speaker wires to HU. They should read just under 4 ohms to each speaker. If you get a flier that is well under 2 ohms, potential short here.
Also, make sure the Neg wires are not grounded to body during install. Most/all new HU's are floating ground systems. They should not be grounded to car metal parts.
Swez
ttocs on 05/2/2005 00:13:17
please be more specific.. You have the subs X hooked up through the rca outputs to X amp in X car.
Please include as much detail as possable in make models, color of the car, tires and air pressure, aaaannnnddd a pic of yer girl if ya got one..
Just kidding, but please read the let us help you article on the home page after signing in. Welcome to the forum, we have alot of people that can help alot......
Black_Rob on 05/2/2005 01:29:42
Swez ... i didnt have covers on the connections to one of my back speakers. I just had the raw metal clips on the connectors. If the raw connection touched the metal on the surface where the speaker is placed on, this could cause it to short/blow?
HU: JVC KD-LH3100
swez on 05/2/2005 09:11:04
If they shorted together or to ground, good possibility it will blow the internal amps on the HU.
As ttocs mentioned, more details are most helpful. Give this a good read before your next post OK?
http://www.clubknowledge.com/Car_Audio_FAQ/
Swez
ttocs on 05/2/2005 14:16:59
if the leads touched, hopefully the amp would shut off to keep this from happening. If one of the leads is still shorted, this could be your problem. Always make sure there is no bare wire and that tape is an insulator, not a connector.
Black_Rob on 05/3/2005 02:59:09
Just to narrow down the possibilities ...
Are there any ways that I could have blown the internal amp from something that happenend with my Subwoofers (pre amp outputs), or are those 2 completely seperate departments. I just want to narrow down the possibilities. If i can count out the subwoofers and amps, then im just going to rewire my entire car with new speaker wire.
swez on 05/3/2005 10:16:33
Subs are on a preamp circuit out of the HU if you are using RCA's. That's a separate circuit then internal amps off the HU.
If you have RCA outs form the HU and the rest of the HU is still working properly, can run a set of amps off the RCA's. From what I see on that HU, you have 3 pairs of RCA's. Front/Rear and sub outs. Each are capable of 2 volts. If they are working properly, can add a 4 channel amp to power the interior speakers and leave sub system as is. The main thing here... make sure your speakers are not shorted or have blown open coils. New wires from the 4 channel amp to each speaker are a good idea. Use #14-16 gage wire there.
Swez
PS Hopefully, the electricals in this vehicle are stong enough to support both amps. What do you have now for a vehicle and give details on your present sub amp.
ttocs on 05/3/2005 13:52:24
does the deck smell smoked?
Black_Rob on 05/10/2005 22:23:15
What are "blown open coils" .. How can i tell if I have one. Can this occur w/o the speaker sounding terrible?
My car is a 1992 Honda Accord.
I have 2 kenwood amps that are 300rms at 14.4V
2 15" MTX Thunder 6000's
Can you recommend some cheap 4-channel amps that would give me decent sound. Im not looking for anything much better than a factory quality interior speaker sound.
ttocs on 05/11/2005 09:43:11
the coil is the internal motor of the speaker. It is just a piece of wire wrapped up into a coil. When you blow a speaker it often will burn the coil making the speaker stop working. You can test this with an ohm meter to check impedence, or often by just trying to push the speaker in. If it is blown often it will make a heavy scrapping sound when it moves.
swez on 05/11/2005 21:16:40
Ttocs is correct... if the coils are blown open, no sound at all. If you measured the wire lugs with an ohmeter, the meter would read "0" ohms or infinite on analog meters.
If the speakers are damaged from excess heat or power, you can hear scraping noises as you manually motivate the cones in and out. That's usually a burned coil that did not fully separate.
The main thing, test the speakers with a known good audio source. If they sound clear and clean at moderate power, probably OK.
Swez
ttocs on 05/11/2005 23:16:18
you can often smell if they are burned.... Let out the magik smoke and the electronics will stop working.
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