Orion 2350gx right channel not developing full power

SomeGuyInPDX · 27th October 2011, 03:02 AM

Back Again. The amp in question was repaired in another thread. I thought it was working fine but it is lacking power.(Old School Orion 2350GX Anyone have tech info?)
The amp is still running and sounds great, but I have noticed that the right channel(the repaired one) is not producing full power. I have switched the RCA's to verify that one channel wasn't getting a stronger signal but that wasn't it. So I switched the subs to see if that may have had something to do with it, but still the same result. After running the amp at about 1/3 power for 5-10min the left half is noticably warmer to the touch than the right channel. Right channel seems to have about 1/2 to 2/3 the power that the left channel is producing. since this amp is actually two 2 channel amps bridged, I'm starting to think only one of the 2 channels is working on the right channel.

I checked the gain pots again and both channels are getting 1v input.
any idea's anyone_?

Perry Babin · 27th October 2011, 04:00 AM

Drive a sine wave (50-100Hz) into the amp and measure the AC voltage on each of the 4 speaker wires where they come out of the board. List the voltage on all 4 with the corresponding wire color. Place the black probe on the RCA shields, the secondary center tap or on the small black wire when measuring the voltage.

SomeGuyInPDX · 29th October 2011, 08:06 PM

Its looking like I might have had a bad rca cable. I will get new quality RCA's and post results.
Using the sm. Blk wire as ground I got 18.5vac on all four output wires using 1v input and 100hz test tone. (Orange, Black/orange, Yellow, Black/yellow)

What is the max AC voltage voltage I should see at full power with gains wide open?_
I read somewhere that it should be around 36v at max output but that may have been bad info.

Perry Babin · 30th October 2011, 09:15 AM

~16.5v per each output wire at clipping. Double that if measured across both speaker wires.

SomeGuyInPDX · 3rd November 2011, 03:09 PM

Ok, I rewired everything in the trunk.(pwr/grd wires,loc,eqx, and big3 with 1/0 welders cable) I disconnected the rear speakers and ran the wires directly to my AudioControl EQX, eliminating the LOC. I'm not sure why I had the LOC in there to begin with, but it sure made a difference in clairity. Also by disconnecting the rear speakers the fronts have gotten noticably louder.(due to less of a load on the RCU, I guess?) I did have a bad RCA that had been causing problems with the right ch. output. I will have to do some testing, but it seems to sound good on both channels now. Thanks Perry.

27th October 2011, 04:00 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Drive a sine wave (50-100Hz) into the amp and measure the AC voltage on each of the 4 speaker wires where they come out of the board. List the voltage on all 4 with the corresponding wire color. Place the black probe on the RCA shields, the secondary center tap or on the small black wire when measuring the voltage. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

30th October 2011, 09:15 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	~16.5v per each output wire at clipping. Double that if measured across both speaker wires. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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29th October 2011, 08:06 PM	#3
SomeGuyInPDX diyAudio Member Join Date: Sep 2011 Location: Portland, Or	Its looking like I might have had a bad rca cable. I will get new quality RCA's and post results. Using the sm. Blk wire as ground I got 18.5vac on all four output wires using 1v input and 100hz test tone. (Orange, Black/orange, Yellow, Black/yellow) What is the max AC voltage voltage I should see at full power with gains wide open?_ I read somewhere that it should be around 36v at max output but that may have been bad info.

3rd November 2011, 03:09 PM	#5
SomeGuyInPDX diyAudio Member Join Date: Sep 2011 Location: Portland, Or	Ok, I rewired everything in the trunk.(pwr/grd wires,loc,eqx, and big3 with 1/0 welders cable) I disconnected the rear speakers and ran the wires directly to my AudioControl EQX, eliminating the LOC. I'm not sure why I had the LOC in there to begin with, but it sure made a difference in clairity. Also by disconnecting the rear speakers the fronts have gotten noticably louder.(due to less of a load on the RCU, I guess?) I did have a bad RCA that had been causing problems with the right ch. output. I will have to do some testing, but it seems to sound good on both channels now. Thanks Perry.

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