Nice system K-Rose. You don't need a preamp if you buy REL subs. And connection is really easy.
Besides the obvious sound of real sub bass, I look for adjustments in the crossover and high/low outputs at small increments. And being a woodworker, I also looked at fit and finish and how the cabinet bracing of the sub is manufactured. That is just as important to me.
REL Sub-Bass system connects to your Pass Lab amp speaker outputs via the Neutrik Speakon-type connector (3 wires). You'll connect the REL to the same amplifier output terminals as the magenpan 3.7. In other words, the signal sent to the REL is exactly the same signal sent to the speakers, allowing for seamless integration.
More on REL connecting up can be found here:
REL Manual
Besides the obvious sound of real sub bass, I look for adjustments in the crossover and high/low outputs at small increments. And being a woodworker, I also looked at fit and finish and how the cabinet bracing of the sub is manufactured. That is just as important to me.
REL Sub-Bass system connects to your Pass Lab amp speaker outputs via the Neutrik Speakon-type connector (3 wires). You'll connect the REL to the same amplifier output terminals as the magenpan 3.7. In other words, the signal sent to the REL is exactly the same signal sent to the speakers, allowing for seamless integration.
More on REL connecting up can be found here:
REL Manual