old head unit, old amp, new sub

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thursday613

Member - Posts: 1

Joined: August 02, 2005

Location: United States

Posted: August 02, 2005 at 3:43 PM / IP Logged

I have an old jensen piece of garbage 30X4 head unit. it has no remote wiring hook up. so i figured id hook it up to the ignition switch on the wiring harness... the amp is also old and only puts out 250 watts (maybe?) its an MTX Thunder 250X. which i think is getting power.. the light comes on and everything but when i bridge the wiring to the 1 1300 watt peak sony xplod sub that i have... nothing. please answer back seeing as tho i have my entire interior ripped apart and i dont feel like driving around like that for long. thanks

tcss

Silver - Posts: 1,623

Joined: June 07, 2004

Location: United States

Posted: August 02, 2005 at 4:00 PM / IP Logged

Put a test speaker on the amp and see if you get sound.

geepherder

Platinum - Posts: 3,668

This member consistently provides reliable information

Joined: October 27, 2003

Posted: August 02, 2005 at 8:55 PM / IP Logged

Yes, if the light is turning on, then so is the amp.

How is the amp getting signal? Are you using RCA's? Are you sure your sub is good (does it play in your car, did you test it)?

Check with a multimeter to see if you're getting signal back to the amp. Disconnect any speakers you have connected to the amp. Set your multimeter to AC voltage, and with the volume on the deck turned up, test the RCA's for voltage. Touch one probe to the center pin of the RCA, and the other probe to the shield on the outside. Make sure you have signal on both left and right channels. If you have signal back at the amp (you should get a half a volt or more), plug the RCA's in, and test for output at the speaker terminals. Test each channel individually- left and right. Then test them bridged. It could be that one of the channels is bad.

My ex once told me I have a perfect face for radio.

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old head unit, old amp, new sub

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