i'm using two LDS single 15 cabs, 15" by 23 1/2" by 18", each with two 4"wide ports that have 5" deep tubes. don whipped them up to fit two emi kappa 15As i had, and they've kicked butt for a while now for my P-bass/sansamp/power amp grindy rock playing. thing is, the speakers are getting a little long in the tooth, and i'm starting to hear a little crappiness in the low end when they get pushed. that may be from the crest LT1500 power amp i've used for years, which as far as i can tell doesn't have much in the way of low end filtering and may have just worn the poor speakers a little with too stuff below the box tuning. i just scored a PLX 3002, which i've set with the 30Hz filter on, and that's been an improvement, but i still might be due for some replacements at some point. so... will the 3015 (non-LF) play nice in these boxes? what kind of roll-off or box tuning or whatever would they have?