Im not sure if my head unit or my amp is shot. Any ideas?
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Road Master
Joined: Mar 2009
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From: Richmond, VA
Im not sure if my head unit or my amp is shot. Any ideas?
01 Police Electraglide
I have a Kenwood KIV bt900. I have a sounstream amp 520.4. A few weeks ago we had about 2hrs of rain on my way back from GA. On my way home my 6.5s went out. I finally had an opportunity to do some testing. While playing music off of my jump drive i get sound out of my tweets which are connected to the fronts on the head unit. I have the amp on the rear RCAs of the radio. No sound out of the 6.5s. I moved the RCAs to the front set of the head units. No Sound. Sub woofer RCAs, no sound. I put a meter on the RCAs each set of RCAs while the music is playing and i got from .4-.7VAC. Since music should be best read with a oscilloscope, im not sure if my readings are correct or not.
I put a multimeter to the amp power and accessory. Got power. Power is good on the amp. The crossover setting for the 6.5s is on the full switch.
Checked the speaker output at the speaker lugs, it wasn't warm in my hands. What voltage should i be reading at the speakers? AC voltage right?Have you ever heard of both of them going out at the same time? Got some focal ic65.
If there is more to it and im missing something holla at me. Im unofficially down for the winter. (AKA- got too much to do with it before i put it back on the road)
I have a Kenwood KIV bt900. I have a sounstream amp 520.4. A few weeks ago we had about 2hrs of rain on my way back from GA. On my way home my 6.5s went out. I finally had an opportunity to do some testing. While playing music off of my jump drive i get sound out of my tweets which are connected to the fronts on the head unit. I have the amp on the rear RCAs of the radio. No sound out of the 6.5s. I moved the RCAs to the front set of the head units. No Sound. Sub woofer RCAs, no sound. I put a meter on the RCAs each set of RCAs while the music is playing and i got from .4-.7VAC. Since music should be best read with a oscilloscope, im not sure if my readings are correct or not.
I put a multimeter to the amp power and accessory. Got power. Power is good on the amp. The crossover setting for the 6.5s is on the full switch.
Checked the speaker output at the speaker lugs, it wasn't warm in my hands. What voltage should i be reading at the speakers? AC voltage right?Have you ever heard of both of them going out at the same time? Got some focal ic65.
If there is more to it and im missing something holla at me. Im unofficially down for the winter. (AKA- got too much to do with it before i put it back on the road)
Outstanding HDF Member
Joined: Mar 2012
Posts: 2,843
Likes: 0
From: Michigan
OK, lets get this straight.
Tweeters hooked up to the speaker outputs - sound.
Amp hooked up to any RCA - no sound.
You mention the jump drive. Do you get full sound out of the radio, or does the problem exist no matter the music source?
If it exists over all sources, it points to either all three sets of RCA's as bad or the amp. Do you still have the harness for the high level inputs? If you hook the speaker out from the radio to the high input to the amp and you don't have sound, you have a bad amp. Sound, you have bad RCA outs from the radio.
Tweeters hooked up to the speaker outputs - sound.
Amp hooked up to any RCA - no sound.
You mention the jump drive. Do you get full sound out of the radio, or does the problem exist no matter the music source?
If it exists over all sources, it points to either all three sets of RCA's as bad or the amp. Do you still have the harness for the high level inputs? If you hook the speaker out from the radio to the high input to the amp and you don't have sound, you have a bad amp. Sound, you have bad RCA outs from the radio.
Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
you should be reading up to 28VAC here. Maybe slightly higher depending on the head unit.
Look in the stickys above on how to set gains. There is a 1000hz test tone in there. Burn that to a CD. Disconnect ALL speakers from your head unit and disconnect RCAs from head unit to amp. Drop the CD in, and turn the volume up. You should get a constant voltage output on the RCAs. If you don't or it's still hovering at the measurements above, the preamp stage of the head unit is toast. If you get a good solid constant voltage up to rated output of RCAs, then your head unit is ok and you need to move to the amp. Turn everything off, disconnect your speaker wires from the amp, plug in your RCAs from the head unit to amp and then turn it back on and test for AC voltage on the outputs of the amp. Again you should get a fairly constant voltage output here up to about 28vac.
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