need some sound help

[2004TR4-SR5]

i got a 2006 limited with the 10 speaker JBL Syn. installed my alpine cda-105 with the scorsche TA07SR...my speakers dont seem loud at all like they should be...

Is there any gain adjustments on the stock JBL amp?
Is there and sort of adjustments on the interface?
or
Is there a better interface to use??

Please help

 

[alexatwork21]

I recently installled a new HU with a JBL factory setup and had the same issues. After doing some reading online, it seems like they are just quiet in general. You can't change the gain on the amp since it's a sealed unit. I used the PAC interface and it had gain controls, but even at maximum + gain, it still wasn't very loud.

I ended up replacing the factory JBL amp/dsp and speakers.