running a kicker kx600.1 to 2 15inch kicker CVRS. getting about 300rms a lil low but the enclosure is pretty large taking the rms down a bit.... question is what would cause my subs to keep running when i pause the HU or even turn the volume down to zero... They play a constant tone probably 50-60hz... it only happened once but it kind of bugs me, never had an issue before, and now it wont do it again.. checked my amp thought maybe somebody messed with my settings, but they were at normal, no bass boost and about 65-70% on the gain.the thing i didnt get was that even when i decreased the volume they still played at the same volume probably 110-115dbs... ground is good, could it have been some feedback through the rcas maybe?
Replies (5)
swez on 01/4/2006 23:09:31
That sounds like a bad (diconnected) ground on your audio cables. This could be at the HU or the amp(s).
You can test that theory by removing 1 RCA to amp and see what happends. If it goes away, that's the problem.
If it does not go away, reconnect and remove the other RCA connect at amp.
Comments?
Swez
compvr15s on 01/4/2006 23:20:24
ill have to wait for some day light, but it happened for a few seconds i was listening to the music and then the bass just started its own thing lol.. so i paused the HU and was still happening, so i turned the volume down and still occured. powered off the head unit the noise finally stopped, turned it back on and it never happened again, prolly should figure out the issue before something bad does happen tho... kinda get the feeling that you are sitting in your car with your interior speakers but your buddys subs are in your trunk playin a totally different song.
swez on 01/4/2006 23:47:13
Yep, I hear ya on that one. Isolate the RCA connections at amp 1st. It's the easziest place to look 1st. If both RCA channels net the same results, then move to the HU RCA's or any other devices you may have, upstream of the amp.
Another quick test, disconnect both RCA's from the sub amp. If the noise is still there, the RCA's on the amp may have a poor solder joint on the ground of one or both connectors on the PC board. If you wiggle the female jacks on the amp and the problem comes and goes, gotta pull the amp cover(s) and have a close look inside.
Hint: If you have to open the amp, remove the main power fuse and all power lines, RCA's and sub wires. Now, do your close inspection with a strong light and magnifying glass. If you see dull or cracked solder joints at the RCA connections, that's your problem.
Let us know your findings,
Swez
compvr15s on 01/5/2006 18:58:32
checked the amp today one of the rcas was unplugged but still touching the jack somehow, one of my buddies must have been fiddling with something cuz i have never seen an rca come unplugged, but would that cause the issue i was having??? have not had the problem again, so i dunno maybe that was the issue... thanx for all the input
swez on 01/5/2006 19:13:25
Absolutely! You lost the grounding part of the signal path, when the RCA jack became dislodged. If we lose the ground path, we get a loud, mono-tone hum. Once the ground is reconnected, the hum goes away and all is well again.
Glad it was that simple!
Swez
Replies (5)
swez on 01/4/2006 23:09:31
That sounds like a bad (diconnected) ground on your audio cables. This could be at the HU or the amp(s).
You can test that theory by removing 1 RCA to amp and see what happends. If it goes away, that's the problem.
If it does not go away, reconnect and remove the other RCA connect at amp.
Comments?
Swez
compvr15s on 01/4/2006 23:20:24
ill have to wait for some day light, but it happened for a few seconds i was listening to the music and then the bass just started its own thing lol.. so i paused the HU and was still happening, so i turned the volume down and still occured. powered off the head unit the noise finally stopped, turned it back on and it never happened again, prolly should figure out the issue before something bad does happen tho... kinda get the feeling that you are sitting in your car with your interior speakers but your buddys subs are in your trunk playin a totally different song.
swez on 01/4/2006 23:47:13
Yep, I hear ya on that one. Isolate the RCA connections at amp 1st. It's the easziest place to look 1st. If both RCA channels net the same results, then move to the HU RCA's or any other devices you may have, upstream of the amp.
Another quick test, disconnect both RCA's from the sub amp. If the noise is still there, the RCA's on the amp may have a poor solder joint on the ground of one or both connectors on the PC board. If you wiggle the female jacks on the amp and the problem comes and goes, gotta pull the amp cover(s) and have a close look inside.
Hint: If you have to open the amp, remove the main power fuse and all power lines, RCA's and sub wires. Now, do your close inspection with a strong light and magnifying glass. If you see dull or cracked solder joints at the RCA connections, that's your problem.
Let us know your findings,
Swez
compvr15s on 01/5/2006 18:58:32
checked the amp today one of the rcas was unplugged but still touching the jack somehow, one of my buddies must have been fiddling with something cuz i have never seen an rca come unplugged, but would that cause the issue i was having??? have not had the problem again, so i dunno maybe that was the issue... thanx for all the input
swez on 01/5/2006 19:13:25
Absolutely! You lost the grounding part of the signal path, when the RCA jack became dislodged. If we lose the ground path, we get a loud, mono-tone hum. Once the ground is reconnected, the hum goes away and all is well again.
Glad it was that simple!
Swez
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