20 Most Recent Behringer EuroPower EP4000 2Channel Amplifier Questions & Answers

Use splitter cables to double your outputs. The signal strength will be half to each speaker per channel. i.e. if each channel has an output of 100w then splitter cables will give you 4 x 50w to connect up. Aim to use speakers rated below the max output rating of your amp, so in this example 4 x 40w speakers would be safer (won't blow your amp) than 4 x 60w speakers

I looked at a schematic for EP2500 which is same but has a lower buss voltage than the EP4000. Below, the drive signal to the power stage is full wave rectified to illuminate the LED, d-c is presented to the LED if R128 & R138 has an a-c return. There is a line that can push-up the a-c return. It goes off to a connector that is unknown. I suspect the push-up voltage is not there. It could mean anything. I think its coming from the main transformer, Check for blow fuses. Also the speaker output is protected with a "Crowbar" circuit. It is simply a Triac device (light dimmer) or two SCRs to prevent d-c from shorted output devices being applied to the speakers. which would cook the speaker coils. This may be activated when amp is turned on. Then there is the possibility of the output power devices - one or more shorted. The amp needs to be checked out by a repair technician.

If you have operated this amp normally before and it just started tripping the breaker and wont re-set, It will have to be checked by a technician to determine what is causing the overload ie shorted capacitor or some such.

What about the bias current? Most current amplifier, say within the last 15 years, do not have adjustable bias.

Will be no doubt the main power amp that has failed that is connected to that channel. It will be located on a big heat sink and be hotter than the other(s) channels if you go in after it's been on.

which breaker at the back

The rule of thumb is you control your audio on the low side. That means you plug your mics, tuners, audio sources into the pre-amp and then the pre-amp into the equalizer/mixer ant finally the mixer into the power amp and the amp into the "large honkin' speakers". The inter connects on the low side (between the source, the mixer and the power amp are usually done with RCA plugs. Use a good quality set of cables to get good tight connections and solid grounding.
AUDIO SOURCE?MIXER?POWER AMP---
heavy speaker wire sized to your SPEAKERS.

Alwaays use balanced lines. The amp will accept either XLR or TRS at that end. The Numark accepts 1/4 TRS. You should probably get TRS to TRS cables... While these look a lot like "stereo" 1/4 inch cablles they are NOT. Thesee need to be intended for balanced interconnection. They will be twisted pair within a shield. Here is an example:

http://accessories.musiciansfriend.com/product/Monster-Cable-Studio-Link-500-Interconnect-TRS-M-TRS-M?sku=331684

You're amp is probably approaching thermal mode which causes the amp to overheat and eventually shut down or if it has a limiter built in this is due to distortion. You must lower your output volume.

Hi.. It sounds like one of the power supply rails ( + or - ) is not functioning. These run around 80-100V DC It will need service

Toroid Transformer is used in power supply not with headphones out. Headphones out are directly connected with headphone amplifier IC. (Note that the difference in 4700 and 8000 is number of channels. Rest of the circuit diagram is same). Behringer HA 4700 PowerPlay Pro-XL ' SynthXL - FREE Service Manual

When a heavy item is dropped onto the top of a control, it can break internally. I would check the encoder switch is working correctly, if not, replace if needed.

Check the routing and toggle the buttons. It may be a tarnished connection.

Also how do I reconnect the fan? It sounds like you may have a broken potentiometer (aka volume knob) for the master volume control. If that is the case, you would need to replace it with a new one (or take it to an electronics technician to diagnose and repair). Regarding the fan disconnection, this likely isn't causing your issue but you would still want to reconnect it as it keeps your amplifier cool while in use. Reconnecting is fairly straightforward - all fans have 2 or 3 wires that connect to corresponding terminals on the amp. Just make sure you don't mix up which wire is positive and negative, and make sure they are connected firmly and securely.

I would order new cable price = quality. CBI cables with neutrik connectors.

Hi, Please test the loudness of your device with a third-party decibel meter. This will give you a clear measure of whether the loudness of your device is changing with increase in volume. It could be that your surroundings are absorbing the increased sound. Thank you.