Equipments as follows... 1 behringer ep4000- 2 x 2000@2ohms - 2 x 1400 @4ohms 1 behringer ep2500- 2 X 1200@2ohms - 2 X 800 @4ohms 2 yamaha s215v @ 4ohms-1000 watts/2000 watts peak 2 jbl mrx 518 @4ohms- 500 watts/1000watts peak 1 behringer crossover cx2310 how do i connect it properly?

I generally get replacements from Simply Speakers. Their site is-Replacement by Simply... Genuine Eminence Parts New
You can also just replace the diaphragm. The procedure is on YouTube here-
Speaker Repair Yamaha Eminence Horn Driver Diaphragm Replacement by Simply... Genuine Eminence Parts New
Be sure you check what impedence you need. If you look at the lable on the driver it will normally say, but if not ask them about your specific cabinet. For instance the 8 ohm single 15" Yamaha Club Series 4 uses a 16 ohm driver in their 8 ohm box.

I generally get replacements from Simply Speakers. Their site is linked below.
You can also just replace the diaphragm. The procedure is on YouTube linked below.
Be sure you check what impedence you need. If you look at the lable on the driver it will normally say, but if not ask them about your specific cabinet. For instance the 8 ohm single 15" Yamaha Club Series 4 uses a 16 ohm driver in their 8 ohm box. Genuine Eminence Parts New Speaker Repair Yamaha Eminence Horn Driver Diaphragm Replacement by Simply...

Firstly check if you R getting clipping at the input ,if U have it, then lower the vol of the music source andif their is no clipping at the source then U must have you speakers checked for it may have some voice coils burnt .with best wishes .system tech.

You'll need to connect both your PC and the Mic to the mixer, you'll need phantom power switched on at the mixer for the mic to work, you then take the two track out to the Aux input on the receiver.

you could get away with getting a small behringer mixer that has +48V of power for the mic. Put your mic cable into there and then run straight out using 6.5 (guitar) cable to your computer. you may need some connectors to convert your jack.

There was never anything mentioned about the 18 yamaha sub in the hook up process

Do you have the owners manual? If not you can download one from Behringer for free. The manuals are in pdf format and come in several languages.Go to Behringer, click on products, click on DI boxes, click on Ultra DI-DI100, look towards the bottom of the page and you will see DI100 Manual, click on the language you prefer( in my case it was English). Do you have a specific question about the manual. It is pretty concise and gives you a couple of setups for an example. Follow the directions closely and you won't hurt your equipment. Hope this helps.

It sounds like you have ground loops. This is noise generated by having interconnected equipment grounded at different physical locations. Especially a problem if you have a cable from your cable TV provider connected into your equipment.
Remove EVERY connection into and out of the mixer. Plug in headphones. Noise? If so, mixer needs repair. If not, re-connect equipment 1 piece at a time and assess for noise. If it slowly increases as you add connections you will need expert on-site help to fix it. If it is sudden, what was just connected is the source and steps need to be taken to lift the ground on the connection to that equipment.

first of all you must connect as follows.
1-preamp/mixer-------equalizer/reverb unit------amp-----speakers(keep all equalizer control to 0db).
2-check your cables for good connector no touching of any inner wire to chassis of any equipment.
3-go to radio shack and buy(ground-loop isolator).
parts code(270-054)-----better to buy two pieces and connect it between your equipment.

The feedback unit should be connected between the pre-amp section and the power amp section. As you descrubed the ST-out and P.Amp IN are the ones to use.

Dan