no sound out of subs from amp

jroseler · 21st July 2011, 01:38 AM

i recently purchased a new amp for my car to power 2 subs. the amp i had before went bad(bestbuy tested it), so i already had all the wiring and subs, i just had to hook up the new amp. however, when i turn the stereo on i get power to my amp but no sound. i know the amp is fine because i tested it in another car. i used an output converter to connect the rca cables to my head unit. is it possible tht the output converter OR the rca cables just went bad? what else could be the issue? any help would be GREATLY appreciated.

Perry Babin · 21st July 2011, 02:24 AM

What make/model amp?

jroseler · 22nd July 2011, 08:50 PM

power acoustik OVN2-1800

Perry Babin · 22nd July 2011, 10:07 PM

Do you have a multimeter?

jroseler · 22nd July 2011, 11:26 PM

yes. to test the voltage? or ohms?

Perry Babin · 22nd July 2011, 11:59 PM

AC voltage.

Disconnect the RCAs from the amp, turn the head unit on and set the volume to about 3/4. Measure the AC voltage on the RCA jacks. Place one probe on the shield and the other probe on the center conductor. Do you see a varying voltage that increases/decreases with the volume level?

You can do this more easily with a steady test tone but it can be done with music.

jroseler · 23rd July 2011, 12:29 AM

nothing happened when i did this. what does tht mean? bad RCA cables and or ouput converter?

Perry Babin · 23rd July 2011, 12:30 AM

It could be either or an incorrect connection at the head unit.

Try it again directly on the output of the converter (not through the RCA cables).

jroseler · 23rd July 2011, 01:36 AM

still no signal

Perry Babin · 23rd July 2011, 02:14 AM

With the black probe on the case of the head unit, touch each of the speaker wires feeding the LOC. Do you see any AC on those wires?

21st July 2011, 01:38 AM	#1
jroseler diyAudio Member Join Date: Jun 2011	no sound out of subs from amp i recently purchased a new amp for my car to power 2 subs. the amp i had before went bad(bestbuy tested it), so i already had all the wiring and subs, i just had to hook up the new amp. however, when i turn the stereo on i get power to my amp but no sound. i know the amp is fine because i tested it in another car. i used an output converter to connect the rca cables to my head unit. is it possible tht the output converter OR the rca cables just went bad? what else could be the issue? any help would be GREATLY appreciated.

21st July 2011, 02:24 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What make/model amp? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd July 2011, 10:07 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have a multimeter? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

22nd July 2011, 11:59 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	AC voltage. Disconnect the RCAs from the amp, turn the head unit on and set the volume to about 3/4. Measure the AC voltage on the RCA jacks. Place one probe on the shield and the other probe on the center conductor. Do you see a varying voltage that increases/decreases with the volume level? You can do this more easily with a steady test tone but it can be done with music. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

23rd July 2011, 12:30 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It could be either or an incorrect connection at the head unit. Try it again directly on the output of the converter (not through the RCA cables). __________________ 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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22nd July 2011, 08:50 PM	#3
jroseler diyAudio Member Join Date: Jun 2011	power acoustik OVN2-1800

22nd July 2011, 11:26 PM	#5
jroseler diyAudio Member Join Date: Jun 2011	yes. to test the voltage? or ohms?

23rd July 2011, 12:29 AM	#7
jroseler diyAudio Member Join Date: Jun 2011	nothing happened when i did this. what does tht mean? bad RCA cables and or ouput converter?

23rd July 2011, 01:36 AM	#9
jroseler diyAudio Member Join Date: Jun 2011	still no signal

23rd July 2011, 02:14 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With the black probe on the case of the head unit, touch each of the speaker wires feeding the LOC. Do you see any AC on those 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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