Tip & How-To about Audio Players & Recorders

Behringer PMP powered mixer safety issue

This is applicable to the PMP powered mixers regarding an undocumented issue of polarity of speaker connections.

Failure of the "A" side of these units can happen if Speakon to 1/4 inch speaker cables are used and IF the barrel of the 1/4 inch plug becomes grounded. This can happen from careless handling or from intentionally trying to parallel another device from the output which results in a ground being placed on the barrel of the 1/4 inch jack on the "A" side of these mixers. The barrel of a 1/4 inch on the "A" side is the "hot" from the amp.

Upon analyzing the circuitry, these mixers internally invert the audio signal to the "A" side and then the speaker connections reverse the polarity again. Behringer does this to easily allow "bridged" operation of the amplifier.

This creates a hazard that can result in blowing the "A" side amp of these mixers.

If one ONLY uses Speakon connectors everywhere it is NOT a problem, but anytime 1/4 inch plugs are used in the speaker cable system, the hazard exists.

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i want to know where i can get a new fuse for my pmp 5000b-212XL powered mixer ?? and waht kind of fuse is it ?


If the fuse has blown DO NOT replace it without repairing the cause of the failure. You will likely do more damage to internal components. Take the unit for repair before applying power again. I have repaired many of these and first a failure occurs in one of the power amps... usually the A channel, then people replace a fuse that protected the power supply and that blows the power supply taking out another $30 of components and $200 labor. (they are hard to change) If the unit is under warranty, exercise your warranty immediately. There is a weak spot in the channel A power amp.

ALSO please read my tip on here about a hazard in PMP series powered mixers. It is in regard to using Speakon to 1/4 inch speaker cables... NOTE that the BARREL of a 1/4 inch speaker cable or adapter from the Speakon is the HOT side for channel A and if you ground it inadvertenly, goodbye channel A power amp!!!

Jan 04, 2011 | Behringer PMP4000/B212XL Mains & Monitors...

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i want to connect two passive b212 and 6 active b215 , i will use two active b215 for monitors ..... i am using a PMP 3000 Please advice,also where can i get a detailed numbered illustrations sheet for this mixer .... thanks. Prem.


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.

http://www.behringer.com/EN/downloads/pdf/PMP1000_P0566_M_EN.pdf

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.

Nov 24, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

i have four active and two passive speakers how do i hook up to amp


Assuming they are ALL mains and not for monitors connect this way:

Connect the passive to the A and B powered outputs. Please read my tip on Fixya regarding hazard of grounding speaker leads on channel A of PMP mixers.

Connect each pair of active speakers to the Main L and R 1/4 inch jacks using TRS balanced cables. Power these speakers from the SAME receptacle or source, even if it means running an extension cord to your mixer from where the actives are plugged in. FAILURE to do this creates a hazard of ground loops and ground bounce that can damage equipment. The Main L and R 1/4 inch jackls can drive more than one active speaker... these are line level signals. Make sure to use TRS balanced cables for this.

Nov 10, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

how to set up my power mixer?


First thing is to read my tip regarding a speaker polarity hazard of the PMP mixers.

Second thing is to VERIFY speaker cables are properly connected.

If you are using in stereo mode set the slider switch to MAIN L/Main R.

describing all possible configurations is not possible on here, but read your manual with this. If you don't have a manual, download one for free.

Oct 14, 2010 | Behringer Europower Pmp5000 Powered Mixer...

1 Answer

Hi, We have recently purchased a Behringer PMP6000/VP1220/VP1220F PA package we have a pair of speckon to 1/4 TS connectors and a pair of 1/4 TS to 1/4 TS connector cables we have the mains on tripods and the angled mons in the floor on the connections do you connect the speckon cables to each A and B port on the back of the PMP 6000 power mixeran to each main speaker and if so where do the 1/4 TS connectors from the mons. connect to on the board or do use the A and B speckon ports separately one for the mains and one for the mons and just parallel the paired speaker with that and if so also which selection is used on the toggle for the amp mode main L and R, or mon1 and mono, or A and B bridge amp mode. Thanks, any help would be appreciated. DH


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.

Aug 07, 2010 | Behringer Europower Pmp5000 Powered Mixer...

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