For some reason the bass is not playing and the music is scratchy. at first when i wiggled the wire a bit on the head phone it played a little bit better but no bass what so ever.. is there place i can replace parts? i really want these to work again..

8 months they should still be under warrenty. sent them in to be repaired.

That bass combines passive EMG pickups with an active preamp (which provides the bass and treble controls). Sounds like you are never getting the preamp to work, and if that is the case there could be numerous reasons...a dead battery...jack wiring that is broken (meaning the battery ground wire is not attached or is grounding out)...likely should see a tech, but that is a good sounding bass when working correctly.

Could be something wrong with the output from laptop.Try wiggling the jack in the connector while music is playing to see if there's any change.

A cajon is an acoustic instrument. If you want it louder you have to play harder or amplify it with a microphone and amplifier.

Turn down the treble gain and mid gain... you don't need it for a bass. Prevent the guitar from "hearing" the output of the amp directly. The guitar strings make a good microphone.

MAKE SURE UR GROUND WIRE IS TIGHT, AND MAKE SURE UR RCAS ARNT NEXT TO THE POWER WIRE.

you will need a larger ground wire also try bolting it down in a new location if you have to scrape away any paint to bolt it to metal
hope this helped

Updated audio codec is required for your system. Go to this link:

http://www.free-codecs.com/XP_Codec_Pack_download.htm

Download it. When a box appears, Click Run button to automatically install it on your system. 

Best regards

bass and speak to loud turn music down

Use a head cleaner tape (available on eBay most likely) and clean the recording heads.