Amp not Powering Subwoofer

[klova9]

Hello!

I'm installing a new subwoofer (Rockford Fosgate R2D2-12) and can't get it to run no matter what I do. I'm pretty sure I have the subwoofer wired correctly to the amplifier (as per the diagram in the subwoofer manual), and the impedance measures correct at the amp terminal (4 ohms).

My amplifier (ks-dr3005d) works with all my other speakers perfectly.

My stereo (KW-R920BTS) has 2 sets of line-output terminals (Front R/L and Rear/Sub R/L), but by amplifier has 3 sets (Front, Rear, Sub). I'm not sure how to connect these or what input mode to use (4 channel or 5 channel). 

I think the issue is either my line-output is wired incorrectly or some setting on my stereo is incorrect. I've tried troubleshooting extensively but I'm just not sure what to do now.

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[keep_hope_alive Premium Member]

There are several items to check.

#1 - check you don't have the coils wired out of phase - the sub wouldn't move if that was the case but you'd still meter 4 ohms.   You can verify with a DMM and measure VAC output.

#2 - make sure the head unit outputs are properly configured.  The menu on the HU let's you assign the rear/sub outputs.  I assume you have the outputs set to rear so the front and rear speakers work.

#3 - the amp inputs are configurable so the sub channel can get the signal from the other 4 inputs (which it seems you need) so set it at 4ch.