Can't get the voltage for gain

[cloud_171 10+ year member]

I am currently in the process of installing my nine.2 with the UR6s. At the moment the sub and the other amp are disconnected. I have am using a 1kHz test tone through the AUX input and have volume at 80%. I unhook both speakers and insert my multimeter into one of the channels.

The voltage is less than 7V at max gain and the desired voltage is 20V. The nine.2 is rated at 100W RMS per channel. When I turn the car off I do notice the output voltage of the channel spike up to about 20V and starts to go down. Is that normal?

The same thing happen to my ZRS amp and I just had it sent for RMA so might not have been a faulty amp after all? or did I kill two amps somehow? What else could be causing this?

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[XanderMoser 10+ year member]

Weak input signal to the amp?

 

[groggy23 10+ year member]

Are you sure the multimeter is reading A/C, not D/C?

 

[cloud_171 10+ year member]

Are you sure the multimeter is reading A/C, not D/C?

positive, I also checked the voltage of an outlet to make sure my multimeter was giving me accurate numbers. Also the head unit is suppose to give 4V outputs, could I just take a multimeter to the headunit and test that?

 

[johnson 10+ year member]

Is there an input voltage selector on the amp?

 

[jmanpc 5,000+ posts]

you say you hooked it up through the aux in... did you tuen the volume up on both the hu and the external device? that's gotten me before.... //content.invisioncic.com/y282845/emoticons/hitbybrick.gif.68a672fae224041f00769a97c2c1bf2d.gif

 

[Russkels55 10+ year member]

Check the ground as well and make sure it is good.

Russ

 

[cloud_171 10+ year member]

If you can't get a proper voltage, just hook the speakers up and tune by ear ... If you're still not getting much volume at all, you probably have bad pre-outs on your head unit ...

Hmm..would it not reaching the voltage mean the amp can't do the rated power?

Also the ground is on a seat belt bolt so should be fine...I think. Also I made sure I had the volume maxed out on my laptop along with winamp. Also I did not see any input selector.

 

[cloud_171 10+ year member]

Well I just received the results on my Cadence RMA and seems that the power supply was blown up. Would this be a result of a user error or something? Since the same symptoms seem to be showing up on the nine.2.