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Absolute maximum is two of these per side. The speakers are 8 ohm and two on each of the outputs would be 4 ohms which is the minimum allowed for the amplifier. You will get about 400 Watts RMS per side doing this. Please note that the stated 1200 watts for the amp is the PEAK (fakey) values put forth in all the ads we get now. With 4 total B212XL's you should be able to fill an indoor venue of about 10000 square feet with sound at the OSHA limit.
The answer is "Not Much"... they upped the rating for power out and added 1000 to the model number... I don't know of any circuitry difference between them... it would probably be minor. Functionality is the same.
Your PMP what? Is this a Behringer?... and if so what model?... If it won't power up, for goodness sakes do NOT replace a blown fuse as additional damage usually results. Get it serviced... if under warranty, then exercise the warranty. If it is a BEhringer, then also read my tip on Fixya tips regarding PMP mixers and a hazard of using 1/4 inch plug speaker cables or adapters.
No preference, just use mode that fits your venue. As far as system safety I would run in Stereo A/B rather than bridged mode.
Now please read my tip about PMP units on Fixya regarding a hazard if you convert the Speakon outputs at some point to 1/4 inch plugs. If you do this, please note that the SLEEVE, not the tip on channel A is HOT to ground and shorting this to ground will often fry channel A. Channel "B" the tip is the hot speaker lead. Thsi is done by Behringer to facilitate switching to bridged mode.
Often the A channel power output blows. CEASE using the unit immediately until repaired as continued use can have additional damage to power supply.
Any problem with speakers can blow the channel as there is real weak insulation on a multi-layer circuit board in the rear most amp (channel A). It burns and takes out three transistors on the HCA2400 module inside.
ALSO read my tip on here regarding a hazard of Behringer PMP units due to the channel A connection when using Speakon to 1/4 inch plugs or adapters having the BARREL being the hot lead instead of the TIP of the 1/4 inch plug. Short that barrel to ANY ground and goodbye channel A.
The passive speakers connect to the main outputs using Speakon connectors on the back.
You will use Balanced connections (TRS) to the main L and R connections on top to the active speakers. Daisy chain 3 active on each of the L and R top connectors.
You can download a user manual if you don't have one.
ALSO PLEASE read my tip regarding a hazard when using Speakon to 1/4 inch speaker cables on channel "A" in the FIXYA tips for PMP mixers. The barrel of the channel A 1/4 inch is the HOT side of the signal to the speaker instead of the tip.
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