We just got a PMP6000 and this has to be the worst manual ever written. Not a word about bridge mode except that it has one. Do I have to rewire a speaker cable or what? Which fader would control the mains? Can I still use the crossover on MONO to feed a sub amp?

In my opinion, due to the physical appearance of pmp4000 and pmp3000 look the same, it will most likely also have a common circuit and parts list (at least, most).
Usually Behringer (and all the manufacturers), with the same series / sequence, using the same circuit, the difference is the number of channels only. You can compare the parts list on PMP3000 schematic, with your PMP4000.
PMP4000.

PMP3000


You can download from this link.
http://elektrotanya.com/behringer_pmp3000_sch.rar/download.html
Hope this helps.
Regards.

You can get the entire service manual for this unit here:
BEHRINGER PMP6000 SCH Service Manual free download schematics eeprom...

Sorry, those speakers are rated at 250 Watts RMS continuous, NOT 600. The speakers are nominally 8 ohms. The PMP6000 will deliver about 250 watts RMS to an 8 ohm load so the speakers should be able to take this as long as you had one per side and NOT using bridged mode of the PMP6000. It is possible that you fried the amp, although the PMP amps have a speaker protection network that shorts the output should the amp hard over. It is strange that you could draw smoke with the setup. Hopefully you were not generating very low frequencies that were below what the speaker could handle OR that you did not crank up the bass with the EQ such that frequencies below the speakers rating were sent at high levels. Your speakers are rated for a low end at 55 HZ. You should have the eq cut the gain below that. The leftmost EQ (50 Hz) should NOT be higher than center... if you boost that one, you likely will be buying new speakers. If you need power below that, then you need to be using subwoofers. Hopefully you haven't damaged the PMP6000... I assume that was the amp you were using, although you haven't stated that. At this point, unless the stuff is under warranty, you nee to open the speakers and see what has blown... could be the woofers or the crossover network...Use an ohmmeter to check the woofer DC resistance... should be between 7 and 9 ohms. If it is open circuit, the voice coil is blown.

Insufficient information ! Were you using a special cable used for bridged mode or used regular cables and just changed the slide switch to bridged mode? IF you had regular cables for A/B and just had the switch to the bridged mode NO DAMAGE WOULD RESULT. The bridged mode switch really only sets both amps to be driven from the same mixing buss as monaural. If you had a bridged cable and a plain one you would have overloaded one side amp. The amps have an "electronic" over current fuse and if you trip it you have to leave the power off for a minute or so and then re-power the amp. There is a HAZARD that I have written a tip in Fixya about PMP mixers. The sleeve of a 1/4 inch plug connected to side A is the HOT signal out of the amp as opposed to the B channel being the tip of the 1/4 inch plug...this assumes you might be using Speakon to 1/4 inch speaker cables. DO NOT under any circumstances use Speakon to 1/4 inch adapter cables as the barrel of the adapter female part on channel A is HOT to ground and you will pop the A amp.!!!! I am afraid that if you were using regular cables taht another failure occurred not related to the setting to bridged mode. The speaker leads for bridged mode are configured by the way the special bridged mode Speakon cable is wired... The slide switch only configures where the amps get there audio be it stereo busses or singly from one side. If after being off for a few minutes the amp still is totally dead, check the main power fuse which is alongside the power input connection in a plastic boat you pull out. IF THE FUSE IS BLOWN do NOT replace it as it will likely cause additional damage. Have unit repaired. There is a weak spot in these that results in arcing between layers of a multi-layer circuit board.

My advice is that if you need to ask how to do it, you don't have enough experience to execute this properly and safely. Please take it to an expereinced professional.

In bridged mode, both sides are used to drive the same speaker. One side is phase inverted relative to the other so the two sides add their voltage. It is important to note that you cannot go below 8 ohm speaker in this mode. The amps can generate about 60volts peak or about 43 volts RMS. So the net will be about 86 volts between the two sides. With 86 volts on 8 ohms you can get about 925 Watts max... yeah it is not the claimed 1200, but it is a lot closer than the shop vacuums claiming 4Hp when running on 120 volts... Those are peak values that have LITTLE to do with actual true values.

You can't run stereo in this mode because BOTH sides are used as a single power source. The PAN controls will have little effect as the system is in monaural mode.

You require a special cable with the Speakon copnnector wired a special way. Refer to your user manual for the correct pin connections to use bridged mode and then put the slide switch in the position closest to the effects display.

Refer to figure 4.6 on page 10 and figure 4.7 showing the connection for bridge mode.

NOTE: you cannot go below 8 ohm speaker on the bridge mode... that USUALLY means a singl speaker of 8 ohms... you CANNOT parallel two 8 ohm speakers.

The single speaker cable will plug into the "B" output connector. Remember bothe the barrel and the tip of the connector if using 1/4 inch plugs is HOT and grounding either inadvertently will fry the amp.

OK... from the schematics it appears that when in mon1/mono mode you use ONLY the MON1 gain controls, including the channel MON1's and the MON1 slider. Make sure you have each of those turned up as needed. In this mode, MON2,s and the MON2 slider are unused. The MONO slider controls the MAIN output.

use 1/4 inch speaker cables. hook one speaker up to "main 1 R" out and the other to "main 1 L" out. if you have additional main speakers, hook them up the the "main 2" outputs.

look for the "bridge amp mode" switch and move it to the "main L- main R" position.

Please read a tip I just posted regarding a hazard of the Speakon to 1/4 inch cables when used with these PMP mixers.

If you are using your main speakers as stereo, then you will need either powered monitor speakers OR an additional seperate amp for them. The mon outputs on the mixer are LINE LEVEL and are not driven by a power amp. Use TRS (balanced) interconnect cables from these to POWERED monitor speakers.

You can parallel your two mains providing the parallel impedance is 4 ohms or greater (two 8 ohms in parallel at most). The the monitor speakers can be paralleled and the switch set to Main/Mon so that one side of the power amp drives the mains and the other drives the monitors.

To prevent damage to the mixer, make sure all speaker leads are secure before powering the system. Run the speaker leads through the handles of the speakers to prevent inadvertent unplugging due to personell tripping over cables.

DO NOT use the bridge mode in your use.