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  • Gasper
    Contributor - Level 1



    I am new here. I would like to ask some technical question about new Lab Gruppen PDX3000 amp. It seems to be a perfect solution for my JBL4645Cs. First of all I would like to know what is the DAMPING FACTOR (aprox. up to 300Hz)?. For the input on XLRs I would like to connect it directly from the integrated amplifier from speaker terminal (high level to low level); I made some measurements and normally high level does not exceed 0,5V - how much volts can take XLR input on PDX3000?


    Thank you very much in advance.


    Kind regards,


    Gasper Jancigaj

    0 408
    • Gasper

      Hi Gasper,


      The following is a white paper published by Lab.gruppen detailing why we do not use Damping Factor in our specifications.


      Damping factor

      The damping factor is determined by the quotient of the speaker impedance and the output impedanceof the amplifier. To state the damping factor figure of an amplifier is meaningless, as the speakerimpedance’s varies with the frequency and the various types and brands of loudspeakers existing.The figures of the true damping factor are only valid for a specific amplifier/ loudspeakercombination. This fact gives one of the reasons why Lab.gruppen don’t publishes the damping factorfigures.The only figures that are relevant for amplifiers are the output Impedance figures. Most amplifiers onthe market only show low output impedance (or high damping factor) at low frequencies and high(er)at high frequencies. This is due to the improper design of the output network and/or frequencydependent feedback. Lab.gruppen design has the feature to have nearly constant impedance over theaudio frequency band with a value of 0.05 to 0.07 ohms (50-70 mohms) . This causes less coloration.Another feature of the power supply in the fP 2200 - fP 6400 (thanks to the stabilised power supply),is that the output impedance doesn't rise during clip situations. In most conventional amplifiers theimpedance rise 10 or l00 times during clip. That causes uncontrolled movements of the speaker-cone.The conclusion must be that the Lab.gruppen switch mode power supplies sound better or have betterdefinition, especially in the bass region, compared to conventional designs.


      Damping factor influences on active and passive frequency divided loudspeakers

      Another reason not to publish the damping factor is that it’s not relevant to the audio quality of the power amplifier. For example; a professional loudspeaker driver has a DC-resistance between 2 and 5ohms, which is connected in series with the driver in the equivalent circuit diagram of the driver. Inthis case, the damping factor has more to do with the speaker itself than the amplifier, as the speakerdriver is connected directly to the power amplifier just as in an actively divided system (see example below).In a passively divided speaker system the filter network circuit are placed between the power amplifierand the speaker driver. In this case, however, the filter impedance determines the damping factor ofthe speaker driver. The output impedance of the power amplifier can influence the characteristics ofthe filter response, but it’s not sure that a lower impedance (higher damping factor of the poweramplifier) will give a better response. A classical example is the tube amplifier, which has relativelyhigh output impedance and which gives a very good sonic result in most cases.





      I am not entirely sure I understand your question,  "For the input on XLRs I would like to connect it directly from the integrated amplifier from speaker terminal". Could you explain what you wish to do in a bit more detail please?


      The PDX inputs are Line Level, if you are using an appropriate audio source then it will be a line level output also. What are you planning on using to drive the input on the amplifier?

      • April 6, 2020
    • Gasper
      MrPaulDavidThomas I'd like to know how you get on with your JBL 4645C's. Alas the answer you got didn't really help as far as I can see :-(
      • December 7, 2021
  • New
    Contributor - Level 2

    Is there a recommended replacement fan for the NU3000?

    0 11
    • DanielThompson
      Nigel67 Hi DanielThompson. Our spares team will be able to advise you pricing and availability for a replacement fan. Please raise a ticket to them. This can be done by clicking on the support tab at the top of the page. A new window will open. Scroll down and click on the Spare Parts tab and submit a ticket. Or if you are looking at another manufacturers fan, the specification is usually written on the fan and you can measure its dimensions. Please make sure if you do go inside the unit that the power is disconnected from the unit. This will void any remaining warranty though.
      • December 5, 2021
  • New
    Newcomer - Level 1

    Hello, I have a sound reinforcement business in Guayaquil-Ecuador South America.  I need to buy parts to repair an FP7000 LAB GRUPPEN AMPLIFIER.  Where can I find a dealer to sell me the parts?


    0 8
    • sonidoduarte
      KyleJohnson Hello, Kyle here with Music Tribe. Please contact our Parts team. To do so, click on Support and then Spare Parts to submit a ticket.
      • November 21, 2021
  • New
    Newcomer - Level 1

    Hello guys. I have a situation here.. I live in Cambodia at the moment and I have this beautiful amp from Lab Gruppen.

    Model FP10000Q. I had some issues with it and I got it fixed but... we have lost one of the parts :( it's a side panel.

    Can anyone help me get it here? I'm trying to make it but it's not that easy. Could I order it from somewhere somehow??

    Please help me. I need to fix it.

    Thanks in advance.

    0 21
    • kennykennedy
      NicJonesMT Hi There.
      If you click support at the top of the page and submit a Spare Parts ticket, a member of the team will be able to assist you.
      • November 15, 2021
  • New
    Newcomer - Level 1

    I have alot of equipment as a portable dj and entertainer I have an issue I need addressed . I ordered 5 behringer amps back in 2011 along with 4 18 inch subs and 2 dual 15 inch tops and 2 single 15 inch tops. I needed as much to cover different small venues without moving equipment from my main venue gig. the larger amo rack with 4 amps in it which were 2  berhinger 3000 watt amp and 2 4000 watt amps . I used a few times with no problem, never over worked anything ad it was too much for some of the places I played. fast forward to a few years later I took the amp rack out and hooked up everything for an outside event . and about 15 minutes into playing one amp went out. I switched the amp . the next time I used the rack another amp went out. I wasn't pushing it hard or anything. I bought the 6000 watt amp and used it twice same thing . now I have 3 broken amps in my trailer that need to be repaired . they all power on but with any load they click off. usually because of the good price I just replace but as I see now I can't find your products on my supplier's website. what could the problem be? there was no moisture or over hard use. all amps were and is inside of sealed amp racks.

    0 14
    • djmarshallb
      Paul_Vannatto Sweetwater is their new super partner for the US. You will need to contact them for product.
      • November 1, 2021
    • djmarshallb

      not the same as zzound though. credit check on orders payment plans. zzound didn't and offered 12 months. I stocked my business with zzound and American musical.

      • November 4, 2021
  • fj0094
    Newcomer - Level 1

    i have a Behringer INUKE nu6000 which stop powering up, i am trying to find an authorize Behringer service center in connecticut , can anyone help.


    0 86
    • fj0094
      KyleJohnson Hi Frank, Kyle here with Music Tribe. Please submit a Support ticket by clicking the Support link at the top of the page.
      • September 28, 2020
      • Behringer INUKE NU6000 power amplifier
        artiobras1 Hola, a mi me pasa lo mismo, he intentado enviar un ticket seleccionando garantia, he rellenado todo el formulario excepto en la fecha de compra que no me deja seleccionarla y no consigo que se envie el ticket, me podrias decir algo, muchas gracias.
        • December 27, 2020
      • Behringer INUKE NU6000 power amplifier
        KyleJohnson Hi Angel, if you are still having trouble with this, try submitting your ticket as "Pre Sales" which requires less information. We can then try to see what is going on.
        • December 28, 2020
    • fj0094
      adrian1971 Hi! mine power up,but the protection problem....started off an on...but now its on the protection dead!
      • October 28, 2021
  • New
    Newcomer - Level 1

    Hello,  I'm trying to get a replacement power supply as mine has sadly disapeared.  How can I get a hold of a new power supply?


    0 13
    • jmsernell
      Dale_M Hi there please go to the support tab and select Spare Parts, the team will advise you.
      • October 21, 2021
      • behringer Xenyx Q802USB
        jmsernell Thanks Dale, I had sent a message through there last week and have not heard back yet.
        • October 22, 2021
  • New
    Newcomer - Level 1

    Does the PS-1 color the tone in any way?


    0 22
    • parisdobermans3
      WilliamR Hello, William from musictribe here. The PS-1 shouldn't color your tone in any way by means of the ps-1 circuitry. Any change in tone would be a result of the resonance of your cab and the volume you are playing at. All of which affect your overall guitar tone.
      • October 20, 2021
  • New
    Newcomer - Level 1

    I have been looking at the following amps and not sure which series would best fit my needs.  EP4000, NX3000 or NU6000.  I know very little about these amps so there might be a better option other then these three.

    I will be driving two 18" subs that can handle 600w RMS each. They will only be playing lower frequencies.  I can purchases these subwoofers in either 2 ohm or 4 ohm setup.  What ever amp is going to give me the best power in either setup works for me.  My Proccessor will be handling all cross overs, filters and equalization.

    Question is which amp would you suggest for my application.  I've known guys who have used the EP4000 in bridge mode on a pair of these subs (2 ohm) wired in series.  They say it is a great setup but also the NX or NU series might be a better fit.

    Thanks in advance.


    0 25
    • Hutchorr
      PedroRodrigues Hi Hutchorr I think that for your set up the EP4000 is a good Amp for your set your set up but the NX4-6000 might be also a good option, please see the specs for the NX4-6000 below, I hope this helps you selecting the best AMP for your needs.
      • October 13, 2021
      • Need help with an Amp Selection
        Hutchorr Thank you for your suggestions. Any particular reason why you'd suggest the NX46000 over the NX6000? Both do 3000w x 2 @ 4 ohm. Do the Class D amps reproduce bass better then a class A/B? I do know they run cooler and more efficient.
        • October 13, 2021
  • New
    Newcomer - Level 1

    Hi! I bought a used GX110 a few weeks ago, and this weekend I took it a bit far with the volume (since it couldn't be heard over the drums via Messenger..." and it started to smell burnt. After letting it cool off for a few days and trying it out again, something is messed up with the sound and it is especially something wierd with the bass.

    I am aware that the GX110 is no longer available, but do you have any model similar to it? Loved the sound in it.

    0 27
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