Kicker Impulse IX702 Somewhat Works - diyAudio
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Old 31st August 2013, 08:47 PM   #1
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Default Kicker Impulse IX702 Somewhat Works

Hi everyone!

Great site here. Been lurking for a while and finally joined today to ask a question about a amp I have.

It's a Kicker Impulse IX702

The amp will power on and play but the right channel is noisy even with no signal going to the amp. The left channel sounds ok. Also the amp will cut off at low to medium volume. I had it wired up 4 ohm stereo.

The amp has done this since I got it about a month ago.

I took it apart and found numerous cold solder joints and touched them up, but no change.

There is a spot by 2 resistors that looks like it got pretty warm.

I am not sure what to check out on this.

Thanks on advance!
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Old 31st August 2013, 09:14 PM   #2
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What test equipment do you have (multimeter, scope...)?
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Old 31st August 2013, 09:18 PM   #3
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Hi Perry,

I only have a digital multimeter. I don't have a scope.
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Old 31st August 2013, 09:25 PM   #4
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Do NOT power the amp up without the transistors tightly clamped to the heatsink.

Does the noise in the right channel ever change when you operate the various pots and switches through their entire ranges?
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Old 31st August 2013, 10:32 PM   #5
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Ok. Just put the board back in the chassis and have everything clamped down.

The noise does not change while adjusting the gain, bass, treble pots. But when I switch the 70hz/110hz and full/hp/lp switches it will randomly make the a loud pop thru the right speaker only and puts the amp in protection. After a couple seconds it will come back on.
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Old 31st August 2013, 10:59 PM   #6
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After it pops and comes back on, do you still have the noise in the right channel?

Do you have more than a fraction of a volt of DC on any output pin of any of the op-amps in the preamp section? Place the black probe on one of the non-bridgng speaker terminals.
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Old 31st August 2013, 11:56 PM   #7
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Yes the noise comes back when the amp turns back on.

When I tested the output I got:
Left channel: 0.00 vdc
Right channel: -0.04 to -0.06 vdc

I messed around with the crossover and frequency switches to see if which combination causes the pop.

Full to HP - no pop
HP to LP - pop and protection
LP to HP - pop and protection
HP to Full - no pop

In HP and switch 70hz to 110hz and 110hz to 70hz - no pop
In LP and switch 70hz to 110hz and 110hz to 70hz - pop and protection each way

Full - both speakers play
HP with xover on 70hz - both speakers play
HP with xover on 110hz - both speakers play
LP with xover on 70hz - both speakers play
LP with xover on 110hz - only left speaker will play - only get noise from right
Noise is present with any combination above
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Old 1st September 2013, 12:41 AM   #8
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The op-amps are the 8 or 9 pin black ICs on the RCA end of the amp.
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Old 4th September 2013, 11:49 PM   #9
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Hi Perry,

Sorry for the late reply. I finally had some time to test IC's today

There is a total of 10

Started with the one at the top of the board by the rca's and worked my way down

1) .01 .01 .00 -8.49 .01 .00 .01 8.55
2) .00 .00 .00 -8.49 .00 .00 .00 8.55
3) .00 .00 .00 -8.50 .00 .00 .00 8.55
4) .02 .02 .02 -8.50 .04 .04 .04 8.55
5) .02 .02 .02 -8.50 .00 -3.22 -3.22 8.55
6) .02 .02 .02 -8.50 .04 .04 .04 8.56
7) .02 .02 .02 -8.51 .01 .00 .00 8.55
8) .03 .04 .04 -8.50 .12 .12 .13 8.56
9) .03 .04 .04 -8.50 .12 .12 .13 8.56
The 10th is by itself to the left of all the rest
10) .01 .01 .01 -8.50 .01 .00 .00 8.56

All are a NJM2068LD part number
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Last edited by 1997eclipsegst; 5th September 2013 at 12:05 AM.
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Old 5th September 2013, 12:15 AM   #10
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Location: Louisiana
Assuming that pins 6 and 7 are connected by a trace on the board, op-amp #5 appears to be defective.
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