amp cooling problem, not like the other one
04-23-2006, 07:44 PM
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Car: 97 b4c camaro
Engine: 350 lt1
Axle/Gears: 3.23
amp cooling problem, not like the other one
I have a 6 or 7 year old jensen 200 W amp 2 ch. I dont know what ohm it is stable at but i have it bridged. It has no fans or openings, it is all solid everywhere around. It heats up fast and burnt myself on it. It also shuts off when turning it up too loud when warmed up. What way can I keep it cool or mount it where can stay cool. thanks for any advice.
04-23-2006, 08:26 PM
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Car: 88 camaro, black, T-tops
Engine: 305 5.0L
Transmission: 700R4
1: pull the speaker/sub and look on the back of each one.
2: at the final set of wires connect a ohm meter or multi meter.
ohm loads on speakers are as important to a car stereo as a exhaust is on a motor.
Right amount of restriction= good. Wrong amount of restriction=bad.
2: at the final set of wires connect a ohm meter or multi meter.
ohm loads on speakers are as important to a car stereo as a exhaust is on a motor.
Right amount of restriction= good. Wrong amount of restriction=bad.
04-24-2006, 09:29 PM
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Car: 88 GTA
Engine: 350 TPI
Transmission: T-56
Axle/Gears: 9 bolt w/ 3.73
Originally Posted by lowgas&rubber
i checked it and it is a little over 4 ohms.
To put this simply: how many subs are you running? How many coils do they have? What’s the resistance of one coil?
If your final load is 4 ohms you should be fine assuming the amp is bridgeable to 4 ohms. I would be surprised if it's not.
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04-24-2006, 09:59 PM
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Car: 88 GTA
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2 ohm coils or 4 ohm coils? Just trying to make sure we're saying the same thing when you say 4 ohms 
04-25-2006, 09:27 PM
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Originally Posted by lowgas&rubber
4 ohm coils
04-26-2006, 04:27 PM
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yeah if its a jensen amp i don't think its capable of 2ohm mono bridged (aka 1ohm) operation. Hence your overheating problem.
4 and 4 parallel = 2ohms, bridge that and you get 1 ohm.
4 and 4 in series = 8ohms, bridge that and you get 4 ohms.
4 and 4 parallel = 2ohms, bridge that and you get 1 ohm.
4 and 4 in series = 8ohms, bridge that and you get 4 ohms.
04-26-2006, 09:25 PM
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Originally Posted by lockchad
yeah if its a jensen amp i don't think its capable of 2ohm mono bridged (aka 1ohm) operation. Hence your overheating problem.
4 and 4 parallel = 2ohms, bridge that and you get 1 ohm.
4 and 4 in series = 8ohms, bridge that and you get 4 ohms.
4 and 4 parallel = 2ohms, bridge that and you get 1 ohm.
4 and 4 in series = 8ohms, bridge that and you get 4 ohms.
No, the speakers impedance doesn't change when an amplifier is bridged.
BUT
When a two channel amp is bridged to a 4 ohm speaker, it puts the same load on the amplifier as running two 2 ohm speakers in stereo. This is why most class AB amplifiers are 2ohm stereo / 4ohm mono stable. This is also why an amp would put out 50 watts x2 @ 4ohm, 90 watts x2 @ 2ohm and 180 watts x1 @ 4ohm.
Here's a little more reading
Bridgeable Amplifiers
BUT
When a two channel amp is bridged to a 4 ohm speaker, it puts the same load on the amplifier as running two 2 ohm speakers in stereo. This is why most class AB amplifiers are 2ohm stereo / 4ohm mono stable. This is also why an amp would put out 50 watts x2 @ 4ohm, 90 watts x2 @ 2ohm and 180 watts x1 @ 4ohm.
Here's a little more reading
Bridgeable Amplifiers
This is the way most people understand it so I figured I would post it.
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