Behringer B208D teardown

This is a teardown of Behringer B208D active PA speaker.

Inside

Here is input pre-amplifier

Look inside power electronics metal box

Inside here is swich mode power supply (mains to around +-27V) and amplifier board.

Amplifier board has 160W class D amplifier chip (below board and possibly broken) for driving low frequency speaker element, 40W power amplifier IC for high frequencies and power regulator for +-15V preamp power.

The wiring between amplifier and preamp carries ground, +-15v, unbalanced high and low frequency audio signal plus status pin indicating when power amplifier is overloaded.

10 Comments

  1. Tomi Engdahl says:

    With held of the circuit diagram and board close-up pictures I found finally (B210D bigger brother uses same electronics):

    I found the B210D circuit diagram at
    https://www.scribd.com/document/386893914/B210D-pdf

    There are some close-ups of the amplifier board on this spare parts product page
    https://www.fullcompass.com/prod/511577-behringer-q05-00000-09275-amp-assembly-for-eurolive-b208d-and-b210d

    The problems was broken electrolytic capacitor on amplifier board between incoming low frequency audio signal and class D amplifier chip. The practically open circuit electrolytic capacitor

    Reply
  2. Tomi Engdahl says:

    EEVblog #1156 – Focal Professional CMS40 Studio Monitor Teardown
    https://www.youtube.com/watch?v=hhD8-faJuy4

    A look inside the die-cast alloy Focal Professional CMS40 active nearfield studio monitor speakers.

    http://www.eevblog.com/forum/blog/eevblog-1156-focal-professional-cms40-studio-monitor-teardown/

    That foamed adhesive tape around the wires will eventually turn into a nice tarred mess. Some of the grossest repairs I’ve ever done used this junk. I prefer the cloth tape any day.

    Reply
  3. Tomi Engdahl says:

    EEVblog #1072 – KRK Rokit 6 Studio Monitor Speaker Repair
    https://www.youtube.com/watch?v=dftkoD7LG0A

    Repairing a KRK Rokit 6 powered near field studio monitor speaker.
    You won’t believe what caused the fault!

    Reply
  4. Tomi Engdahl says:

    Alesis M1 Active 520USB Studio Monitor Teardown
    https://www.youtube.com/watch?v=KsBVBtUDYx4

    Teardown of an Alesis M1 Active 520USB Studio Monitor speaker

    Repair of M-Audio Studiophile AV 40 Speakers
    https://www.youtube.com/watch?v=i7NveHRgYsI

    In this video I investigate a failure in the internal electronics (the power supply section) of the M-Audio Studiophile AV 40 Speakers.
    Watch it until the end to find out what was the faulty component and what caused an additional damage which normally shouldn’t occur.

    Reply
  5. Tomi Engdahl says:

    Troubleshooting Active Speakers
    https://www.youtube.com/watch?v=SWzPA0G560A

    Troubleshooting Active SpeakersI have recently come across a rather good set of active speakers – a wooden case, high quality loudspeakers, a built-in frequency corrector. But, when turned on, they produced a weird sound. Let’s open them up and see what the problem is. Inside we can see the amplifier itself that feeds the transformer, an active frequency corrector and a separation filter for the speakers. Even without special equipment we can see an inflated component, the function of which isn’t clear.

    Let’s try to remove the inflated components and see what comes out of it. Nothing changed, so the problem definitely lies here. Let’s replace the capacitor with a new working one and turn our amplifier on. The background noise is gone.

    Reply
  6. Tomi Engdahl says:

    Review on the B208D bigger brother B210D that uses the same electronics but bigger speaker element:

    EUROLIVE B210D Active PA Speaker System
    https://www.youtube.com/watch?v=1mkhO5rzcHI

    In this short video we explore the EUROLIVE B210D Powered PA Speakers.

    These active 200-Watt 2-way speakers have a 10″ woofer, 1.35″ compression driver, switch mode power supply and an integrated sound processor for system control and sound protection.

    BEHRINGER EUROLIVE b110d vs b210d speaker review
    https://www.youtube.com/watch?v=LBilA1_lCjU

    Reply
  7. Tomi Engdahl says:

    Behringer B210D speaker problem
    https://www.youtube.com/watch?v=x2sQJaErTM8

    My speaker went out. The power supply is making a noise. The red and green LED lights blink on and off.

    Comments:

    Hello Danny, did you solve it. I have the same issue. Only blinks the light but no sound! thank you!

    Sorry for the delay in responding. I bought a power supply from http://www.fullcompass.com. I ended up calling them to get the right part number. I put it in today and it sounds great. The red and green lights turn on with the power and the green light stays lit. Before the red light would blink.

    Reply
  8. Tomi Engdahl says:

    Miked loudspeaker test, Behringer B210D
    https://www.youtube.com/watch?v=V6LDHwCVeUM

    A/B testing of direct signal and miked loudspeaker. The answer is that A=original direct signal, B=Miked speakers. However I had expected a much bigger difference between these signals.

    Reply

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