Help with DMM gain setting
 

Ok, never did this before and having a tough time, but looking for guidance. Aquatics HU, JL 280/4 bridged in stereo, DDAW's. Trying to set gains with DMM.

• Amp out FR- taped to black lead on DMM
• Amp out FL+ taped to red lead on DMM
• DMM set to ACV
• Volume on HU set to 30/40
• 1000 hz test tone downloaded from sticky at top of forum
• Power on, test tone playing: max voltage showing is 15.4 volts. I believe bridged should be 23.7v per the installation guide.

Any ideas wtf I am doing wrong? It's driving me nuts. There is no way that it should be .5x23.7=11.8v per side is there?

Thanks in advance.

Input voltage switches.

T

on DMM?

Amp

T

currently on low. Should I set to high? Do i leave it on high once gains are set?

Typically in low but depends on your wiring setup. Turn gains all the way down and see what impact it has in high v low.

Also make sure ur DMM is reading VAC.

T

Are u wired 4 channel bridged? Switch at 4 channel input?
Gator clips on correct wires?

T

https://cimg9.ibsrv.net/gimg/www.hdf...c1a619a8e1.jpgLow voltage input, 4 channel (bridged in stereo),filter at 80hz, filter mode hp
https://cimg2.ibsrv.net/gimg/www.hdf...d93fffe134.jpgDMM taped to wires from amp
https://cimg4.ibsrv.net/gimg/www.hdf...1b86ac5221.jpgDMM set to VAC (ACV)

no difference high vs low input

No difference with bike running or not running. I have no idea what's up.