No voltage from the sub preamp?

[Zimmerru]

I have a dual xhdr6435 (not a great radio but it works) and I'm trying to hook up my amp to it but when I checked the preamp with a voltmeter (to figure out which wire on my RCA cable is positive) I am showing no voltage with the radio on and turned up. I set the voltmeter to 200v AC (its lowest AC setting) but I'm not seeing any reading when checking either of the channels.

Is the preamp shot or am I missing something?

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[Louisiana_CRX 5,000+ posts]

level in the radio may be turned down....

 

[Zimmerru]

Subwoofer level is set at 6 out of a possible 0-12. Bass level set it 0 out of a possible -6 to +6 so right in the middle.

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[Louisiana_CRX 5,000+ posts]

Subwoofer level is set at 6 out of a possible 0-12. Bass level set it 0 out of a possible -6 to +6 so right in the middle.

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It also might be the crossover slopes fighting each other from the deck and amp

 

[wew lad 5,000+ posts]

it may only have 2v pre outs or 1v rms, you'll need the headunit nearly maxed out to get a reading with your voltmeter

 

[Zimmerru]

I have not hooked up the amp yet and I don't think the head unit has a crossover built in. My Sony deck did but I don't see any band pass settings in the menu on this one. I thought about the low voltage and will grab a different voltmeter or an auto ranging one to see if it reads low voltage better. I believe the preamp is 2v but I would have to double check.

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[wew lad 5,000+ posts]

a 0db test tone will get you a higher voltage out to check with, but i also just checked by dmm and it shows 200ACV min as yours does, but it also lets me see to the tenths place so you should be getting a reading albeit really low.

im trying to figure out why you even need to do this? does your headunit not have RCA outputs?

 

[Zimmerru]

a 0db test tone will get you a higher voltage out to check with, but i also just checked by dmm and it shows 200ACV min as yours does, but it also lets me see to the tenths place so you should be getting a reading albeit really low.
im trying to figure out why you even need to do this? does your headunit not have RCA outputs?

I have not searched yet but is there a place I can grab a test tone cd or MP3? My meter does show the tenths place but it's not showing any reading.

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[wew lad 5,000+ posts]

I have not searched yet but is there a place I can grab a test tone cd or MP3? My meter does show the tenths place but it's not showing any reading.

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you can download the frequency generator app for your phone