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Thread: EPQ900 power amp - limiter

  1. #1

    EPQ900 power amp - limiter

    I run mine bridged into an 8 ohm cabinet. I switched it on yesterday before connecting the input and as far as I remember there was no loud "pop" as I plugged in the input cable. When I tried to use it, there was no output and I noticed that both limit LEDs were on.

    Although I understand that connecting the input with the amp switched on could cause a spike on the output big enough to engage the limiters, I would expect them to release after a short delay - and in any case not to completely mute the output. In this case, I had to switch off and on again. The amp then worked perfectly for the next 2 hours.

    Is this normal or a fault condition?

  2. #2
    Evan Hooton
    Guest
    Hello David,

    This system protect function is normal on the EPQ900. To avoid this from happening in the future, we recommend that you connect all of your cables first and then turn on the amplifier to avoid going into system protect mode.

    Evan Hooton
    Specialist, Product Support HOW
    MUSIC Group
    BEHRINGER

  3. #3
    Thanks for the reply. Does this mean that if the limiters are activated by a brief transient during normal use, the amp will mute and need to be turned off and on again?

  4. #4
    Evan Hooton
    Guest
    Hi David,
    The amp will only go into limiting protection if the incoming voltage that is coming into the amplifier exceeds .7v coming into the amplifier itself. This is what occurs when you have the amplifier on and then plug the amplifier into the speaker. The voltage that is pushed back from the signal which is produced from your cable being plugged into the speaker on contact, is greater than that value. During normal use, unless you are engaging the input signal peak limit on the EPQ900, you will be fine.

    Evan Hooton
    Specialist, Product Support HOW
    MUSIC Group
    BEHRINGER

  5. #5
    Quote Originally Posted by Evan Hooton View Post
    During normal use, unless you are engaging the input signal peak limit on the EPQ900, you will be fine.
    So if an accidental peak in the input signal causes the amp to go into limiting, will the amp have to be reset or will the limiter "let go" after a short delay?
    Last edited by David Brown; 04-20-2013 at 10:41 PM.

  6. #6
    Dear David,

    I have checked with our engineers and the limiter will "let go" with consistent audio signal coming out. No audio drop out or long time frame for the volume being raised again.


    Kind Regards,
    Zac Ross
    Jr. Admin, Tech Support
    MUSIC Group US
    BEHRINGER

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