MostLow

I guess what I meant was a rectangular vented port on the bottom as opposed to two tube ports.

It really projects on 'spin', but craps out on 'rinse'. 😁

Yes, based on the Eminence specs I thought my cabs would be ok. I guess I got it backwards with the ports. I definitely want the 'full' 450W with smaller cabs. I'm looking for an easy design for my carpenter friend to build me some - perhaps TL606-type cabs. I also saw a Barefaced-type design by d-basser in a thread here from a few years ago, but it seemed like it had a lot of (unnecessary?) bracing in it.

So a 2.5 cu ft internal volume cab would be about 16"L x 14"D x 20"H with a port total (?) of 31 sq in, so 13.77"L x 2.25"W. I guess this guy's 3015 cab wasn't deep enough for straight ports so he used curved pipe. Interesting.

Well, this is a bit embarrassing, but when I went to remove the Kappa's from the cabs I noticed one of them was wired backwards from the other (by me, doh), so between that and the cabs, I'm not surprised it didn't sound so great. I did use a Tech 21 Q-Strip pedal with a set 45Hz HPF, or an Alembic SF-2 Superfilter, but with the speakers being out of phase, was probably a bit moot. I may have customs cabs made to specs mentioned by Bill here, or maybe go another speaker/cab route entirely. I tend to play hollow body basses like the Epiphone Jack Casady, Gibson EB-2, and Guild Starfire, fairly aggressively (and loudly) and go for the ' big-and-heavy-but-transparent' 60s/70s classic rock sound - that's why I like the JBL K140s, but hauling 4 of them (150w rms each for 600w rms total) gets a bit tiring and takes up a lot of space, so I'm looking at more modern lightweight high-powered, but still having something of an 'old school' sound, alternatives. There's an Accugroove 'El Whappo' 15/12/6 cab for sale near me that caught my attention. I hear they handle lows very well and are plenty loud. Bergantino also sounds good but are way pricey brand new. I tried an Orange OBC115 and was totally underwhelmed with it. People have mentioned the 3015 is a good replacement for the stock speaker in those cabs, but they ain't cheap, either.

No, the baffle board is 28" x 20.5". Too small for 2 x 15. So a good 3015 cab would be something akin to the one in the pic here:

Thanks. The cab specs seem similar but now I know.

Hello, new user here. I have 2 Eminence Kappa 3015's that I put in custom 1x15 LDS cabs that were built for JBL K140's, tuned to 40hz. Each cab is about 4.7 cu/ft with 2 ports originally 4" x 6". I extended the ports by 2", so now 4" x 8", but the speakers are farting out on the lower notes (4 string). Seems like these aren't ideal cabs for the Kappa's, but I thought I'd give it a try with my limited knowledge. My other options are a narrow Acoustic 2x15 406 cab, and a JBL 4648 2x15, originally designed for subs in movie theatres (yes, it's heavy). I realize the latter seems like an obvious no-go but it's about 8 cu/ft with 2 ports 5.5" x 8". So, are any of these cabs viable, or should I start from scratch? Is there an ideal cab dimension for these? Thanks.