I'm building a cabinet (using the Eminence Disigner software) with an Eminence CB15 (8-Ohm 300W 48Hz-3KHz) and an Eminence Alpha 8MR (8 Ohm 125W 400Hz-4.8KHz). Each speaker will be mounted in its own 'compartment' in the enclosure. I'll be powering this enclosure with an Acoustic Image Focus 2R Series III amplifier and using it for my upright bass and my Fender Precision bass. I plan to connect them in parallel for a 4 Ohm enclosure. Do I need a crossover or some other electronic component to prevent the low frequencies below 400HZ from having a negative impact on the Alpha 8MR speaker? Thank you.