Amplifier Acting Strange (Static & Distortion)
03-24-2005, 07:03 PM
#32
Why not try a muting plug to check the input of the amp, if the noise goes away then its from futher up the signal chain. if its still there its the amp but have someone who knows electronics have a look at it
03-24-2005, 09:24 PM
#33
0 Watt CAFz'r
Thread Starter
Join Date: Jan 2005
Posts: 49
Originally posted by JohnVroom:
-If you completly unplug the RCA's from the amp do you hear the same issues?
My guess is yes you will hear it because the amp is malfunctioning. If the sonic issues go away, plug in a CD diskman to the amp and see how it performs (you might have to buy the 1/4" to RCA adaptors at 'Radio Shack')
-If you completly unplug the RCA's from the amp do you hear the same issues?
My guess is yes you will hear it because the amp is malfunctioning. If the sonic issues go away, plug in a CD diskman to the amp and see how it performs (you might have to buy the 1/4" to RCA adaptors at 'Radio Shack')
I then used a crossover to only let the highs pass and the thumping was almost gone but still present faintly. The static had turned into a steady background humming/hissing and the speaker was not being fully amplified (considering that it was a speaker that was screaming with half-gain on a PPI I hooked up on it afterward.)
I did not have a chance to get the adapter for a diskman, but it is my guess that I have no choice but to get it fixed by a professional.
03-24-2005, 09:26 PM
#34
0 Watt CAFz'r
Thread Starter
Join Date: Jan 2005
Posts: 49
Originally posted by Jaxom:
Hey
I repaired an amp that was having the same issue - before removing it from the car I found the ground to the chassis was loose. It ended up using the common of the RCA's as the current path for the short period until one of the traces evaporated.
Do the discman thing JohnVroom suggested, it would eliminate a ground loop if the crackling goes away. If it doesn't, the amps front end most likely needs to be repaired.
Good Luck, J
Hey
I repaired an amp that was having the same issue - before removing it from the car I found the ground to the chassis was loose. It ended up using the common of the RCA's as the current path for the short period until one of the traces evaporated.
Do the discman thing JohnVroom suggested, it would eliminate a ground loop if the crackling goes away. If it doesn't, the amps front end most likely needs to be repaired.
Good Luck, J
Thanks for the advice and I will let you know how it goes.
03-24-2005, 09:27 PM
#35
0 Watt CAFz'r
Thread Starter
Join Date: Jan 2005
Posts: 49
Originally posted by :
Why not try a muting plug to check the input of the amp, if the noise goes away then its from futher up the signal chain. if its still there its the amp but have someone who knows electronics have a look at it
Why not try a muting plug to check the input of the amp, if the noise goes away then its from futher up the signal chain. if its still there its the amp but have someone who knows electronics have a look at it
03-27-2005, 11:46 PM
#36
0 Watt CAFz'r
Join Date: Mar 2005
Posts: 34
Wow! Did this thread get hijacked or what?
JA, plug in some shorting plugs to your RCA inputs. Bypass any/all onboard signal processors.
Vary input sensitivity all the way up/down. Still got noise? Off to the repair tech!
On the hijacked side, try this; take your known quiet system, then connect a jumper from RCA ground to chassis ground. For a really definitive demonstration, connect the chassis gnd directly to the alternator case. Enjoy your new audio tachometer!
JA, plug in some shorting plugs to your RCA inputs. Bypass any/all onboard signal processors.
Vary input sensitivity all the way up/down. Still got noise? Off to the repair tech!
On the hijacked side, try this; take your known quiet system, then connect a jumper from RCA ground to chassis ground. For a really definitive demonstration, connect the chassis gnd directly to the alternator case. Enjoy your new audio tachometer!
05-17-2005, 08:17 AM
#37
0 Watt CAFz'r
Thread Starter
Join Date: Jan 2005
Posts: 49
Well, I have been officially told what the problem is.
It is a bad floating ground at the inputs and a few burned mosfets.
Damage? $100-150
I was going to cut my losses and not get it fixed but it is a decent amp and it is worth more to me fixed than sitting in the corner.
It is a bad floating ground at the inputs and a few burned mosfets.
Damage? $100-150
I was going to cut my losses and not get it fixed but it is a decent amp and it is worth more to me fixed than sitting in the corner.
05-17-2005, 04:16 PM
#38
Yankee
Join Date: Oct 2003
Posts: 3,599
Originally posted by JonathanAlexand:
I just received an Orion HCCA 250 G4 that I bought from the states and it is making all kinds of weird noises/sounds.
When there is no music signal, there is audible static. Then when the LP or HP filters are engaged (or disengaged) the woofer either pops forward or sucks back in a regular interval making a 'thumping' sound.
The frequency of the 'thumping' of the woofer increases as the gain is increased. The static can be filtered out with the filters, but no matter what, the output is never clear.
It has nothing to do with the wiring because I have used the same wiring to test other amps before and after this one.
Might this be a bad transistor?
I just received an Orion HCCA 250 G4 that I bought from the states and it is making all kinds of weird noises/sounds.
When there is no music signal, there is audible static. Then when the LP or HP filters are engaged (or disengaged) the woofer either pops forward or sucks back in a regular interval making a 'thumping' sound.
The frequency of the 'thumping' of the woofer increases as the gain is increased. The static can be filtered out with the filters, but no matter what, the output is never clear.
It has nothing to do with the wiring because I have used the same wiring to test other amps before and after this one.
Might this be a bad transistor?
good call
Thread
Thread Starter
Forum
Replies
Last Post
becskei
General Discussion
13
02-14-2010 12:49 AM
