Kenwood KAC-X811D, Low power output - Page 2 - diyAudio
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Old 31st July 2012, 03:05 PM   #11
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When it was new it was running a 15inch at 2ohms until something happened and it stopped working. The speaker was fried, there was no continuity in the voice coils. I removed the system and put this amp away for years. Now I dust it off and hook it up to a 10inch and its like this, very low output. The 10 is only rated at 300rms, the amp is rated 919rms. Am I crazy? This amp should be pounding! I barley hear it over the stock system. The head unit has 2.5v outs and the gain on the amp is set to around 1.5V just so i can barley hear it at normal volume.
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Old 31st July 2012, 10:12 PM   #12
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Thought I would double check the ground. Its not the ground. I got 0.4ohm from the ground wire terminal (amp side) to any random bolt in range. I also got 0.4ohm from the -ve battery terminal to any bolt in range. The DMM reads 0.3ohms when the leads are touched.
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Old 31st July 2012, 10:37 PM   #13
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To determine if the power and ground connections are good, you measure the DC voltage across the B+ and ground terminal of the amp. If the voltage remains well above 12v with the engine running, there isn't a serious problem with the power connections.

When you measured 35v AC across the speaker terminals, was the speaker connected?

Are you sure that you have the positive and negative of the terminals on the speaker connected correctly?

If you connect only one coil, does it get louder?
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Old 31st July 2012, 10:45 PM   #14
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First thing I checked was DC voltage across the B+ and ground terminal of the amp. 12.5V car off. 13.5 with car on.

35v AC across the speaker terminals, the speaker was NOT connected and gain was lower then 2.5V, it was set around 3V.

I have tried changing the +ve and -ve. I will double check.
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Old 31st July 2012, 11:24 PM   #15
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Speaker wires are fine... all + are attached to +. Amp to speaker terminals. I have also tried to flip the phase switch.

I'm not willing to only hook up one coil... how my speaker is it a lot of work to change that back and forth. I believe it was louder when it was hooked up in 8ohms though.
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Old 1st August 2012, 12:49 AM   #16
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Take a 9v battery and connect it across the speaker wires for a few seconds (disconnect them from the amp first). Does that cause the speaker cone to push out or pull in to its limits?

If the speaker barely moves, the wiring is almost certainly wrong on the back of the speaker.
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Old 1st August 2012, 01:06 AM   #17
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Well, it moved. But it did not go to the limits. Its also installed in a sealed box. Should that have gone to full excursion?
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Old 1st August 2012, 07:36 AM   #18
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For a woofer rated at only 300 watts, I would have expected it to go to full excursion. If it only moved a tiny bit, I'd suggest either trying a different speaker or using only one coil of the current speaker.
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Old 1st August 2012, 11:11 AM   #19
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well its a Peak: 600 watts RMS: 300 watts. It moved about half way, 40 to 60%. I have a spare, I will try the other one.
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Old 1st August 2012, 09:21 PM   #20
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My other speaker moves the same amount and makes a POP sound. The subs have very stiff suspensions, take a lot of force to move them to their limits.

I'm sure the subs are 100% fine.
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