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182,149 posts
  • New
    Newcomer - Level 1

    Hi community,

    I want so get a monitor signal from my DI out, and therefore make a cable with XLR to Jack connector. 

    Can I bridge Pin 1&3 safely or will it do any harm to my amp (TC BQ500 bass head)?

    Thanks in advance!


    0 17
    • ID73
      PedroRodrigues Hi ID73 Considering what you are trying to achieve regarding monitoring your signal I would suggest to use the XLR output on the BQ500 to connect it to a device that offers monitoring such as sound card with a XLR input using a D.I. Regarding the asymmetric signal that you referred can you please provide more information on what you are referring to.
      • September 14, 2021
  • New
    Newcomer - Level 1

    Hi there, 

    I recently purchased the Thrust BQ250 Bass Head. It's rated for 250 watts @ 4 Ω. But my cabinet, like most, is 8 Ω. Now, I know the wattage will decrease significantly since the resistance is doubling, but I also know it's not as simple as cutting the wattage in half. ?

    When you have more resistance the amperage goes up, and watts is volts × amps. So it's not exactly half. As with higher resistance you create more source amps and more source amps by source volts means higher watt. ?

    I've read the manufacturer's product page, specs, user manual, etc... I can't find the information anywhere. I've seen other manufacturer's websites and they'll often print the watts for both 4 Ω and 8 Ω so us bass players don't have to take wild guesses or learn electrical engineering (heck we can barely count to 4 right?) ?

    to;dr: does anyone know how many watts the Thrust BQ250 will output to a cabinet with an impedance of 8 Ω ?

    Thanks very much in advance. ?






    0 163
    • sixtwowaifu
      PedroRodrigues Hi sixtwowaifu, please consider that generally on an amplifier, the current will depend on the speaker impedance (ohms). The higher the speaker impedance (in ohms) the lower the current that can be drawn from the amp, which means less the power.
      Rule will be the following:
      “Doubling speaker impedance halves output power”
      This will result in the following:
      With the unit operating with a 4-ohm speaker, the maximum output power will be 250 watts.
      With an 8-ohm speaker, considering the example above the maximum output power will be 125 watts.
      Thank you
      • August 30, 2021
    • sixtwowaifu
      maphisjrock1 Hi, looking for a replacement speaker for a BG250/208.
      • September 2, 2021
  • New
    Newcomer - Level 1

    I was watching a review for the BH800... I assume it is more or less similar to the BH550 with only the wattage differing.

    The reviewer indicated the BH800 was a class D power amp and therefore has a slower attack than other amplifiers.

    I've never heard amps described that way before, can anyone help me understand what it means?

    0 63
    • Jkblight
      PedroRodrigues Hi, Jkblight thank you for your post, please take in to account that there are two basic types of power amplifiers: linear and switch-mode.
      The Class-D amp is a type of switch-mode amplifier that consists of three stages: the input switching stage, the power amplification stage, and the output filter stage.
      A common misconception is that a switching power amplifier is an amplifier with a switching power supply.

      A switching power amplifier utilizes switching technology as a means to amplify the signal, whereas a switching power supply is using switching to provide AC mains power.
      In linear amp designs, the output power transistors amplify the incoming signal analogous to the input signal (same signal only louder).

      In a switching amp, the incoming audio signal modulates the width of an ultrasonic square wave in the output transistors.

      This modulated square wave is then low-pass filtered. The result is the amplified analog signal sent to the speakers. This signal processing is called Pulse Width Modulation or PWM.

      In operation, a switching power amp uses several pairs of power output transistors with each pair operating as switches (transistors can operate either as amplifiers or switches) in a push-pull arrangement. One transistor of each pair turns fully on (saturation) while the other is off, then they alternate.

      One transistor always produces a positive voltage when it is on; the other always produces a negative voltage when it is on. When a transistor acts as an open switch, the current through it is ideally zero.

      When the same transistor acts as a closed switch, the voltage across it is also ideally zero. Whether the switch is open or closed, the power dissipated as heat – current times voltage – would ideally be zero. The result is less power wasted, which means improved efficiency – theoretically 100%.

      Since the output transistors develop almost no current (when off) or no voltage (when on), they produce almost no power wasted as heat. Increased efficiency requires less power from a power supply and smaller or no heat sinks for the amplifier.

      These are important advantages in portable battery-powered equipment. Since the class-D amplifier works in an on/off mode, people mistakenly think that the “D” in class-D means “digital “.

      This is not the case.

      There is no digital coding of the signal. The function of class-D is based on analogue principles.

      Class-D amplifier applications range from battery-powered portable products such as mobile phones, high-end professional amplifiers, musical instruments, and home multimedia systems.

      Please take in to account that I have seen other customer asking information about the same thing and it is difficult to make generalizations, especially when we are referring exclusively to the amps since much is also related to the speakers.
      Nevertheless "fast vs slow" has a lot to do with the bass and it's much more about the transients and the attack.

      Please take in to account that there is no right or wrong or better or worse when it comes to the perception of fast vs slow, as this is a case of perception some Amp may be faster for some and the same Amp may be slower for other.
      • August 16, 2021
  • New
    Newcomer - Level 1

    Hi, I need a spare part logo for my Bt 115 Ts cabinet. Who can help ? It is damaged. [email protected]

    0 66
    • MichaelBugla
      Nigel67 Hi MichaelBugla, please contact our spares team and they will be able to advise pricing and availability. 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.
      • August 14, 2021
    • MichaelBugla

      Thank you Nigel

      • August 15, 2021
  • New
    Newcomer - Level 1

    I really love my amp. I know it is an older model, but lately the sound cuts out shortly after turning it on. I want to get it fixed. I live in Fort McMurray, ALberta, Canada ... any suggetsions ?  

    0 50
  • New
    Contributor - Level 1
    I've been referred here from your facebook page.
    My bass player has an old BH500 head and something has started rattling around inside. It just sounds like something is working loose. It works OK at present but it worries me!
    Can anyone guide me on removing the chassis from the case to have a look? I don't know whether it's just fixed by the 4 screws or if anything else has to be removed. It seems very firmly fixed! This might stop him from throwing it in the skip!
    Thanks for any help anyone can give
    0 86
    • plucker51
      Dale_M Hi there is there any warranty left on the unit? If so we would advise you go to the Support tab above and select the Service option with your proof of purchase so we can assist you, if not please raise a Technical ticket.
      • August 4, 2021
  • New
    Contributor - Level 2

    Hi all -

    I have an RH450 bass amp head that I bought in the USA a decade ago.  I recently moved to the UK.  Can I simply swap the USA power cable for a UK one like I do for my computer?  Or do I need to plug the unit into a step-down transformer to externally convet the 220 volts to 110 like on my vintage amps?


    0 44
    • Agent00Soul
      DavidKnighton Hello Agent00Soul,
      The device has a universal power input that will accept a range of AC Mains voltage from 100 ~ 240 Volts. All you need to do is find the correct AC Mains IEC plug for UK and let er rip.
      • July 29, 2021
  • New
    Newcomer - Level 1

    Hey guys, I just got to try a friend's Veyron Mosfet head with the 210 cabinet and I'm enamored. Why can't I find these cabinets anywhere? I want the same setup, amp and cabinet. Seems I may be able to find the head, but I'd want the cabinet too.

    0 58
  • New
    Newcomer - Level 1

    hi all, I have an rh 750 and wonder when connected to an 8 ohm 4×10 does the power half to when connected through a 4 ohm 4×10 cab


    0 67
    • MauriceBates
      DavidKnighton Hello MauriceBates,
      Typically, the output rating is given at 4 Ohms, so you should have full power when connected to a 4 Ohm load. The manual lists 750 Watts for the power module rating and 1,200 Watts peak output at minimum impedance (4 Ohms). Running an 8 Ohm load would reduce the output power by roughly half, and should allow the amp to run a bit cooler. Check out the POWER RATING document on the product webpage here
      • July 14, 2021
  • New
    Newcomer - Level 1

    At 4 ohms the BH800 has a power module rating of 800W, according to the manual. I believe this is continuous/RMS? 

    But what is the wattage at 8 ohms?

    Thank you very much.

    0 89
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