I bought a Thump15a and plan to use a focusrite scarlett solo with it. My brother plays bass and has a bass amp, and so I was wondering if I could take the output of the thump15a and plug into the input of the bass amp, while setting the mode of the thump15a to sub (this takes out the low end from the loudspeaker and lets the bass amp handle it instead). The only danger I see is that the output is line level whereas the input to the amp is instrument level. What do you guys think?

I am not using a stereo setup (as I only have one loudspeaker), so I could also hook up the scarlett solo directly to the bass amp (but again I believe the output on the scarlett solo is line level). What is the difference between these two setups?


This may work. If there is any level mismatch you should be able to adjust it with the gain knob on the bass amp (make sure the amp doesn't clip at large volumes). But...

  • Thump15a manual says sub mode rolls off low frequencies on the speaker, but it doesn't roll off high frequencies on the output (you want to connect to an amp), so you'll need to do it by yourself. A proper way is to use a crossover. Maybe turning high and mid knobs on the amp all way down will suffice, maybe not. You risk having the bass amp sound interfering with Mackie's sound.
  • Why do you want to add a subwoofer in the first place? For stage monitoring you perhaps don't want a subwoofer at all. For PA you may have trouble to get good sound without a proper crossover.
  • Bass amp and cab might not be as good in reproducing very low frequencies as you may naively think. And very likely it is not reproducing the input sound neutrally.

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