I've been in the process of designing a pair of 4 way loudspeakers. The plan is to go with two Focal 8V4411 8" mid-bass drivers in each speaker for (60-80)-1500 Hz. The high pass will depend on the sub, which will be one BPD 1201 for each tower. Should I put the 8's in a ported sealed or aperiodiclly vented enclosure? I want a flat response, with as much efficiency as possible. The crossovers will be 2nd order Linkwitz Rileys. I would like to keep the volume as low as possible while making no sacrifices with the sound. Any suggestions? Thanks.