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182,443 posts
  • New
    Newcomer - Level 1

    I have a Mackie powered mixer and have two passive mains and two passive monitors. 
    I have a behringer powered sub. Can I hook it up somehow? If so how?

    0 10
  • New
    Newcomer - Level 1

    Hello, I wanted to know how many watts in Rms the Subwoofer does?

    Thank you very much 




    0 7
    • Angel0513
      PedroRodrigues Hi Angel0513, thank you for your post to calculate Watts RMS you use the following formula:

      Watts RMS = Watts x 0.707

      I hope this helps

      Thank you
      • Sep 3
  • New
    Newcomer - Level 1

    Hello this is my first posting.


    We bought a powered  speaker system and one of the bass unit amplifliers isnt working and needs replacing .


     Does anyone now where i can get a B1800D pro amplifier from ? The speaker is fine just the amp required    

    0 2
    • shaneward21
      Dale_M If you bought your speaker within the last 2 years it should still be under warranty, in this regard you can go to the support tab and providing your proof of purchase submit a Service ticket. If this is not the case for spares, contact your nearest Behringer dealer via this tab to inquire:
      • Sep 1
    • shaneward21

      Thank you Dale_M We have had it over 2 years so the warranty won't apply but I will go on the Behringer website and take it from there. Regards

      • Sep 2
  • New
    Newcomer - Level 1

    Currently Behringer power amplifiers power ratings are expressed using the term "max power" and Behringer officially states that "you can expect the RMS/continous power rating would be "around" half the declared max power rating".

    What does "around" half really means? It is "around half" at least or "around half" at most?

    Specifying "Max power" only for a power amplifier could mean that its continous long term power rating may be anywhere over "around half" or under "around half", which makes it difficult to design and calculate a sound system and to choose the proper power amplifier for the loudspeakers for which the continuous and peak power ratings are known.

    What methods or guidelines does Behringer use or follow to determine the power rating of its power amplifiers?

    Are amplifiers tested with sine wave test tones at different frequencies inside the supported bandwidth?

    Are amplifiers tested with pink noise (what crest factor) inside the supported bandwidth?

    Are amplifiers tested with both or all channels driven?

    What is the maximum THD allowed during the power rating procedure?

    What is the resolution of the digital signal processing units used on the power amplifiers with DSP?

    Thank kindly!

    0 12
    • djtetei
      WilliamR Hello, Please click on the support link above and create a tech support case and an agent will get back to you ASAP.
      • Aug 5
  • New
    Newcomer - Level 1


    I have followed the manual's instructions for setting the power amp in bridge mode (dip switches 4-5 OFF, dip switches 6-7 ON). My signal chain is as follows:

    Bass guitar > Sansamp RBI > Behringer EP2500 > Gallien-Krueger 410SBX Plus (8ohm, 800W RMS)

    I have tried using both the Speakon and 1/4" speaker outputs, but the volume that comes out is very low, even with the output level on both the Sansamp and the Behringer at maximum.

    Any help appreciated. 

    0 97
    • Ythg
      Paul_Vannatto The Speakon connector has to connect the speaker wire to the 1+ and 2+ for bridge mode. The default speakon connection is 1+ and 1- (for non-bridge mode). Dismantle the speakon connector and change the wire on 1- to 2+.
      • Aug 4
  • New
    Contributor - Level 2

    Wondering if the bridge cable i had wired specially for use with my inuke nu-4 6000 will work when bridging the newer nx 3000? I suspect it will work but looking for confirmation...thanks


    0 12
  • New
    Newcomer - Level 1

    I'm struggling to understand the value and intended usage of the The Behringer KXD15's "stereo link" feature. It is described in the quick start literature as allowing one to connect a second KXD15 via a "stereo link" cable. What the literature does not address is what happens to the inputs and mixer section on the "slave" KXD15. 

    1. I am guessing that the inputs on the "slave" would be disabled / unavailable, since there would not be a way to feed its inputs back to the "master" KXD. Or, is the intent is to connect the output from KXD.master to the input of KXD.slave and vice versa, which then raises the question, how does the "system" know which one is "master" vs "slave"?
    2. Assuming my guess is correct, that the slave inputs are defeated when in link mode, aside from the relatively low cost of the KXD series, why would one purchase a second KXD only to lose half of its functionality?
    3. To achieve stereo sound, wouldn't one be better off just purchasing two powered satellite speakers and using the XLR outputs?
    4. Is there another mono combo amp (amp+speaker only) that would pair with the KXD for equivalent sound quality that one should consider besides a fully-loaded KXD, or TWO satellite speakers?
    0 14
    • TheRealAndlBequet
      PedroRodrigues Hi TheRealAndlBequet, thank you for your post, you are correct on all your analysis and effectively this is how the KXD15 stereo link operates. The stereo link will only operate correctly when using two KXD15. When it comes to the options you propose that might work, in the end of the day this is all conditioned by your user requirements and the tools you need to have available. Thank you
      • Jul 21
  • New
    Newcomer - Level 1

    L channel quit all of a sudden. Strange because very low load since purchase. I need to get repared. I live in Maine.

    0 3
    • logiclst8
      CLCarter I have connected my 5 channel mixer, and I have been practicing with it. There a couple of things that I am not sure about
      • Jul 10
    • logiclst8
      CLCarter 1: I have had to increase the gain on my cassette deck to get a reasonable recording. Is this normal? I have temporarily routed the cassette deck to the main output.
      • Jul 10
    • logiclst8
      CLCarter I am blind and I have been trying to work my way around the controls. Is there a more detailed manual that I can use? Preferrably with descriptions of the controls and how they are to be used?
      • Jul 10
    • logiclst8
      CLCarter 3. I found the audio quality to be very good without additional affects. However, I am eager to try using some of the audio functions.
      • Jul 10
    • logiclst8
      CLCarter 4. I want to make sure that that I have the inputs and outputs in the right place. The inputs for the 4 channels are set. It is just the outputs that I am not sure about.
      • Jul 10
  • New
    Contributor - Level 2

    My inuke stopped working. Starts to fire up but then fan shuts down after a few seconds and all the channels have the red circles. They dont turn orange. Is there a fix or is this amp toast?



    0 17
    • MattPalmer
      djtetei Disconnect the speakers and try to power on the amplifier without any load. If the described symptoms still persists, you may have to open the amplifier for service.
      • Jun 27
      • Red rings of death? Inuke nu4 6000
        MattPalmer Yeah i tried that at home. Still get the red rings. Thank you.
        • Jun 27
    • MattPalmer
      djtetei Focus on power supply and capacitors.
      • Jun 27
    • MattPalmer
      StaffordAV Hi Matt,
      I have an nu6000dsp with the same problem. It turns on and all the dps functions work, but the rings stay red and there is no output.
      I’ve had a quick look at it, and the main ht rails to the amplifier seem to be controlled by a KA3525A switch mode controller. Having checked the data sheet, this has a shutdown facility (pin 10), which should be pulled low to turn on the output. Mine measures at about 4.5 volts, which might be causing the lack of ht voltage. All the other voltage rails are working OK.
      When I get some time I’ll disconnect pin 10 on this ic and tie it to ground with a resistor, and see if I get power to the amplifier; which will then determine the next course of action.
      Not knowing your background, or whether you have any experience at electronic repairs, I can’t recommend just poking around inside the amp, but it is something for you or your friendly tech to look at.
      • Jun 28
    • MattPalmer

      My Tech guy said these can't be repaired he said not even by behringer. Little to no support and that they were designed to last 5 to 10 years and I should basically just throw it in the garbage...

      • Jul 1
    • MattPalmer
      StaffordAV If you can get replacement parts, or their equivalents, pretty much anything can be repaired. Whether it makes economic sense is a different matter; probably not for Behringer.

      Regarding the red rings of death. I have now had a chance to look at this a bit more closely. The first step was to remove the KA3525 controller (IC3), and replace it with a socket, which would make experimenting easier. That done I put in a SG3525, which is an equivalent ic. Turned on and it worked; temporarily. Having fitted it into a socket let me easily disconnect pin 10, the shutdown pin, after which the amplifier worked OK. However, as this probably disables all the protection circuitry, not really a satisfactory repair.

      Back in a working state, I was able to test for correct voltages around the circuit. The shutdown voltage is provided by IC2, a 555 timer, whose reset pin is connected to ground through a transistor (T4). When the base of the transistor is low (mVs) the output of the 555 is high (3.5V) and the amp shuts down. When it is working there should be about 4.5 volts on the base of T4. On my amp the voltage here was low, so the output of the 555 high, causing the amp to stay in protect mode.

      The problem turned out to be a transistor (T9), which when the amplifier is turned off pulls the control voltage low enough to trigger a shutdown. Removing this transistor let the amplifier power up properly, but it wouldn’t turn off. T9 is a surface mount npn transistor, which I have replaced, and the amplifier now seems to be working correctly.

      I’m not sure if the original KA3525 ic was faulty, but the total cost of replacement parts was less than £1UK so replacing it was not really an issue.

      I don’t know if this is a common cause of the amplifier being stuck in protect mode, but removing T9 can be done without taking out the psu board, so is an easy first thing to try. Before doing anything else, measure the voltage across C24; it should be about 4.5V on a functioning amplifier.

      The base of T4 can also be pulled low by T2 a thyristor, which is triggered by DC offset voltage on the amplifier output. It is connected to the main amplifier board through an opto isolator; so something else to check if T9 is not the problem. Obviously check that there is no DC on the output and the protection circuit is working properly.
      • Jul 1
  • New
    Newcomer - Level 1

    Behringer KM750 specifications state a voltage gain of 32dB. However, if we do the math, the published voltage gain value doesn't add up.

    The specifications states that the KM 750 delivers 200 watts into 8 ohms with an input sensitivity of 0.775 Volts.

    Output voltage formula: sqrt (power x impedance)

    Output voltage calculated: sqrt (200 x 8) = 40V

    Voltage gain (amplification factor): output voltage / input voltage = Av (amplification factor)

    Voltage gain (amplification factor) calculated: 40 V / 0.775 V = 51.62

    Voltage gain (dB) formula: 20log(Av)

    Voltage gain (dB) calculated: 20log(51.61) = 34.25 dB

    The calculated voltage gain is 2 dB higher than the specified voltage gain.

    The only scenario the specified voltage gain is 32 dB is if the input sensitivity is, in fact, 1 Volt.

    Furthermore, if we take the officially specified input sensitivity (0.775 V) and voltage gain (32 dBU) and do the math, we arrive at a different result for the output power of 119 watts, which is less than the officially specified power into 8 ohm load.

    So, the following question arises: when input sensitivity of 0.775 V is selected, the maximum input voltage required for maximum rated power is 0.775 V (0 dBU) or 1 V (+2 dBU)?

    The following scenario applies to Behringer KM 1700, also.


    On 29.06.2022, MusicTribe Customer Solutions Specialist Mr Kyle Johnson replied to my support ticket,  and his answer is as follows: "The 200W is the peak power not the RMS, the calculation should based on the RMS 130W for KM750 and 310W for KM1700. Also, the peak power is actually about 210W."

    This is important information and should definitely be included in the product's user manual.

    Starting from this, suppose we now have a peak power of 210W into 8 ohm load.

    Calculate the peak voltage: SQRT(210*8)=40.987 Vpeak

    Calculate the RMS voltage: 40.987*0.707=28.977 Vrms

    Calculate power (RMS): SQR(28.977)/8=104.95 W

    Calculate amplification factor (X) for 0.775 input sensitivity: 28.977/0.775=37.389

    Calculate dB voltage gain: 20*LOG(37.389)=31.454 dB 

    As you can see, the statement about 130 W RMS doesn't hold up.

    Amplifier power is calculated, not measured.

    A Voltmeter measures voltage in volts. An Ammeter measures current in amperes. An Ohmmeter measures resistance in ohms. Any two of these measurements will allow calculation of amplifier power (in watts).

    If you search MusicTribe knowledge base articles, under Behringer brand you will find an article called "What is RMS" with the following statements:

    "We no longer list our amp power ratings by RMS as these tend to not give true results as tests are always done using signal generators and specific waveforms which don't reflect in comparison to music, music comes at fuller frequencies and non linear dynamics which of course as I'm sure you're aware is nothing like a test tone generated from a signal generator...As a rule of thumb, you can assume RMS is around half the peak value."

    Of course music comes with broad frequency range and nonlinear dynamics, because music is mixed and mastered in a specific way, to ensure tonal balance and a specific dynamic range to make it sound good. Its purpose is to be listened and not to be used as a test tone for audio equipment capabilities and limits, although there are certain instruments that can put an audio equipment to the test. On the other hand, test tones are created and used specifically for testing and measurement of audio equipment capabilities and limits. By using test tones and filtered noise waveforms able to stress and measure the audio equipment capabilities and quality of assembly, manufacturers ensure the customer's piece of mind, knowing that when the specific equipment is used with music, it will never reach the operational limits, unless it is used by reckless or unprofessional people. A 0 dBFS test tone with a crest factor of 3 dB is able to push an amplifier or a loudspeaker to its limits, if played long enough, compared to a music track with a crest factor (dynamic range) of about 14 dB, because the latter will never bring an amplifier to its current limits. As many of you know, music is mixed and mastered with different dynamic range, according to the author or the mastering engineer tastes, resulting in dynamic range values between 6 and 20 dB, which makes it difficult to be used as a test reference. You could use music as a test reference if all music tracks are mastered to the same dynamic range (crest factor) target level, but that is not the case. Therefore if a certain audio equipment manufacturer choose to publish peak values for power ratings, it can also publish the calculated average power output relative to the measured RMS voltage output of its equipment, under specifically stated test conditions (proprietary or standardized), and stand behind its statements, ensuring the proper sound system design and implementation for a potential customer. In my experience, failing to disclose usefull information to the customers and failing to provide a solid customer support for parts, warranty and technical feedback is a sure way to destroy a brand's image and affect its business future, even if that particular brand is making good efforts to offer competitive products in terms of functionality. 

    Anyway, as a conclusion, it seems that if you want to match your speakers RMS / continous power rating with a Behringer amplifier power rating, you should expect half of the declared power ratings.

    Therefore, the calculated parameters for Behringer KM 750 and Behringer KM 1700, based on published specifications are as follows:

    Behringer KM 750:

    Peak Power / channel @ 8 ohm: 200 W

    Peak voltage: SQRT (200 X 8) = 40 V

    RMS voltage: 40 X (1 / SQRT(2)) = 28.284 V

    Average continous power @ 8 ohm: SQR(28.284) / 8 = 100 W

    RMS current: 100 / 28.284 = 3.535 A

    Peak Power / channel @ 4 ohm: 400 W

    Peak voltage: SQRT (400 X 4) = 40 V

    RMS voltage: 40 X (1 / SQRT(2)) = 28.284 V

    Average continous power @ 4 ohm: SQR(28.284) / 4 = 200 W

    RMS current: 200 / 28.284 = 7.071 A

    Amplification factor for 0.775 V input sensitivity: 28.284 / 0.775 = 36.519

    Voltage gain for 0.775 V input sensitivity: 20 X LOG (36.519) = 31.250 dB

    Amplification factor for 1.4 V input sensitivity: 28.284 / 1.4 = 20.203

    Voltage gain for 1.4 V input sensitivity: 20 X LOG (20.203) = 26.108 dB

     Behringer KM 1700:

    Peak Power / channel @ 8 ohm: 500 W

    Peak voltage: SQRT (500 X 8) = 63.245 V

    RMS voltage: 63.245 X (1 / SQRT(2)) = 44.721 V

    Average continous power @ 8 ohm: SQR(44.721) / 8 = 250 W

    RMS current: 250 / 44.721 = 5.590 A

    Peak Power / channel @ 4 ohm: 800 W

    Peak voltage: SQRT (800 X 4) = 56.568 V

    RMS voltage: 56.568 X (1 / SQRT(2)) = 40 V

    Average continous power @ 4 ohm: SQR(40) / 4 = 400 W

    RMS current: 400 / 40 = 10 A

    Amplification factor for 0.775 V input sensitivity: 44.721 / 0.775 = 57.742

    Voltage gain for 0.775 V input sensitivity: 20 X LOG (36.519) = 35.229 dB

    Amplification factor for 1.4 V input sensitivity: 44.721 / 1.4 = 31.943

    Voltage gain for 1.4 V input sensitivity: 20 X LOG (31.943) = 30.087 dB

    0 31
    • djtetei
      PedroRodrigues Hi djtetei, thank you for your post, In this case I would suggest to submit an assistance request directly to our Tech Support Team via the link below to clarify this matter: Thank you
      • Jun 20
      • Behringer KM750 & KM1700 voltage gain specifications
        djtetei CAS-608741-G1P0W9, opened on 20.06.2022. Still waiting for an answer from your staff.
        • 1
        • ·
        • Jun 27
    • djtetei
      djtetei CAS-608741-G1P0W9, opened on 20.06.2022. Still waiting for an answer from your staff.
      • Jun 23
      • Behringer KM750 & KM1700 voltage gain specifications
        PedroRodrigues Hi djtetei, thank you for your post, please accept our apologies, this matter is being managed by one of our colleagues and we will reply ASAP. Thank you
        • Jun 29
    • djtetei
      djtetei Mr. Kyle Johnson from Behringer staff replied to CAS-608741-G1P0W9: "The 200W is the peak power not the RMS, the calculation should based on the RMS 130W for KM750 and 310W for KM1700. Also the peak power is actually about 210W."
      • Jul 1
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