JAB2v2 DSP

IIRC the JAB2 series doesn't have DSP. Here's a question & answer from the JAB2 V4 page:

If i wish to add a sub and a tweeter, would i need a crossover? and which would you recommend?

Hi, Lasse. Thank you for your interest in our products. If you want to add a sub and a tweeter, a crossover is required. We recommend you the JAB3 - 250 (2 X 50 WATT CLASS D AUDIO AMPLIFIER BOARD WITH AUDIO DSP), which can be connected with JAB2 - 250 to build an audio 4.0 system integrated with Bluetooth and DSP. Wish this could help you.