Hi my names jason and i have a crackling problem with one of my krk rokit 5 g2 played a few tune's and the one speaker won't stop poping please could you help me with this i don't what to have to send em back to the shop

What you are describing is a total component failure of something in the crossover board. You cannot really check a crossover without an oscilloscope and a frequency generator. In a lot of cheap speaker systems, there is no crossover board attached to the woofer. In your case it appears that a low pass filter is present on the woofer. http://circuitdiagram.net/loudspeaker-system-crossover-network.html

Speaker Suggestions
Require a few factors?
Home recording
Studio recording
Guitar
Bass
Keyboards etc...
And most importantly the Budget $ ?
nu mark and Makie make decent economical speakers for around $100 a pair
I personally like KRK rockets they start at $300 a pair and up, although have a nice sound for mixing and production,
For guitar I like celestion, ev, jensen, eminence, are all real good speakers
Hope this is some of the info you are looking for? If Not comment back and maybe I can help more?
Thanks

Have you tried isolating the problem, like switching cables from the left side that is not making noise? Also check connections,
I say this all the time and use all the time.... electronics spray contact cleaner, usually takes care of crackling noises
really hope this helps?

There are several issues here... You can connect subs in parallel BUT they need to have a crossover built it otherwise you are sending highs and mids to the subs which won't like it. Properly set up, there should be NO crackling on either channel.
Make sure that no clipping is going on, including in the effects. A set of headphones is a GOOD idea when analyzing problems. Twelve inch speakers are pretty marginal for 300 watts... I have used 15's and 10;s on my PMP3000 and PMP5000 units with no problem at REASONABLE sound levels. With 15's we can run at 95 Db which is OSHA limits... My PMP's were beyond repair units and I have repaired them... got a good deal on them. PLEASE read my tip on here about channel A of the PMP mixers. IF you use Speakon to 1/4 inch speaker cables, THE sleeve of Channel A is the "hot", not the tip of the plug. It is easy to get this grounded and kill channel A of your amp. There is NO mention of this in the user documents and I discovered it when repairing the units. Should you get a failure that pops the fuse, DO NOT replace the fuse until the internal damage is repaired. A lot of craclking can come from blown speakers. Swap your sides and make sure the problem is not with a particular speaker. I had a Peavey that was crackling and found the noise was the logo on the grille that was rattling...

Sounds like you have a problem in the amplifier section. Could be a bad capacitor or a floating ground. As a charge builds it will create the hiss and when it discharges, it surges through the amp causing it to shut down. You'll probably want to send them in for service.

in your system preferences click on sound and adjust the settings you need.

Hello
If you have unscrewed all the seating screws of the circuit board, pull out three knobs at the rear side [HF SHELF/SYSTEM LEVEL ADJUST/HF LEVE ADJUST] and rings screwed to the switches of LF Level adjust, and the screws of XLR socket. Amp with its seating frame wcan be pulled out.
For further details log on to
www.krksys.com/krk-studio-monitor-speakers/expose.html
OK.

Here is alink to the manual:http://www.behringer.com/EN/downloads/pdf/DJX750_P0956_M_EN.pdf You should have no problems hooking them up (RCA to RCA). I've been using a Behringer XenyX1222FX board in my recording system for about 4 years now and have been quite satisfied with it's reliability. Try to find a dealer who will demo the mixer for you.

Look for a failure in the power supply section. You will need electronic experience or someone who has that.

If the fuse is glass and blows silvery inside thia means a direct short inside. SUSPECT the input rectifier or filter capacitor(s).

Do testing with a 100 watt light bulb in series with the hot side of the power cord to avoid blowing fuses.

This usually means that the speaker is blown. Try running through a different setup and see if it fixes the problem. Hope this helps