Horn replacement for mackie thump powered speaker

SOURCE: hi, I need to know how

After removing the back cover disconnect the tweeter cable form the terminal. Then hold the tweeter magnet and turn it anti clock wise. The driver unit will unscrew and come of the horn assembly.
Keep the driver unit on a firm table and unscrew the four + screws. It has a sandwich assembly which will part into two if you put a sharp knife and twist. You will see the tweeter diaphragm which can be lifted up again by using a sharp knife. The replacement diaphragm is available from the below given address
http://reconekits.com/tapcothumpth-15ahorndiaphragmpn0013252-1.aspx

SOURCE: No sound

Your power amp should be connected to MAIN OUT left and right. NOT the MAIN "in".

The CD is connected correctely as you described. Make sure the CD has a line level output to match the input expected by the mixer.
Note:Walkman style CD players require a special cable to go between 1/8 inch stereo to dual RCA plugs.

You have to advance the MAIN fader.

You should be using TRS interconnect cables from the mixer to your amps OR using XLR cables.

SOURCE: How do you get inside

You use a VERY long phillips screwdriver as there are screws in those deep wells from the back. I think it takes a #3 phillips and you want one with at least a 12 inch shaft to reach the screws. The screws are black and are Kaylon or sheet metal types with pan heads. It can be a little tricky to engage the screwdriver bit as deep as these are.

Make sure ALL screws are completely out... count them vs the number of wells... there are a lot!

Then you have to pry the back off.

SOURCE: i have a mackie fx 8 mixer connected to two thump

Balanced audio interconnects (either XLR or TRS cables from the mixer and then balanced audio interconnects from the amp daisy chain inputs to the existing speaker inputs. If the amps do not have linked input jacks, then use TRS type WYE connectors at the inputs. Then use speaker rated cables from the amps to the passive speakers.