Cab For Kappa 3015's

[MostLow]

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.

[Dan Dare]

Have a look at the data sheet for the drivers on the Eminence website. That'll give you cab' capacity, port sizes, etc.

 

Dave Green's Fearful 15 was designed for the Kappalite 3015 if you fancy building your own:

 

[Bill Fitzmaurice]

That diagram shows the 3015LF, not the 3015. The 3015 works best in 70 liters/2.5 cu ft (net) with  200 cm2 port area 35cm long for 45Hz tuning. 

[MostLow]

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

Edited 2 hours ago by MostLow

[Dan Dare]

38 minutes ago, Bill Fitzmaurice said:

That diagram shows the 3015LF, not the 3015. The 3015 works best in 70 liters/2.5 cu ft (net) with  200 cm2 port area 35cm long for 45Hz tuning. 

 

My bad, Bill. A thought occurs. Could @MostLow replace the baffle on one of his 4.7 cu. ft. cabs and add correctly sized port(s) and mount both drivers in it?

 

I've done that before by cutting out the old baffle with a jigsaw, leaving and couple of inches of the edges of it in place to mount a new one onto. It would slightly increase the internal volume and get it closer to the ideal of 5 cu. ft.

 

It assumes the cab is tall enough to accommodate two 15" drivers, rather than being deep, but with a small frontal area. Might that be relatively inexpensive and simple solution?

[MostLow]

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:

 

 

[Dan Dare]

Depends on the dimensions. If the driver in the photo is a 15, the cab looks to be about 19" wide by 12" deep by 24" high. That gives a cubic capacity of around 3.1 cu. ft, although the volume of the ports (which look a little large for the size Bill suggests above) will reduce that. It probably won't be that far off and certainly better than 4.7 cu. ft.

Edited 8 minutes ago by Dan Dare