Hi Fred, You seem to be quite the expert with these drivers. I just purchased a pair of M500 9 watt amps and I am new to the full range speaker concept but have been an audio nut for many years. I'm interested to learn the Idel cabinet dimentions for a small near field front ported cabinet. Like .5 to .75 cu. ft. but I understand that optimal ratios of demensions can be critical for somd quality. Do you have any suggestions for me? Thanks, Pete