KappaLite 3015 in Ashdown ABM 115 Cab
Hi, I've just replaced the Blueline Sica driver in my roughly 5 year old Ashdown ABM 115 deep cab with an Eminence Kappalite 3015. Considering the price, specs, reviews etc I was expecting a bit more, specifically more controlled bottom end - its starts to sound like it's struggling with the lower notes much as the Blueline speaker did except it doesn't "fart".
I was wondering if changing the port tuning would improve matters. I did a "Rice Test" and the rice stopped jumping around at 37hz - is this likely to be how Ashdown factory tuned it or is this as a result of changing the driver? I've looked at the cabinet designer on the Eminence website and it suggests a box of 5 cu.ft whereas mine is about 4.6 cu.ft. It suggests 2 x 4" by 3.5" ports whereas mine has 2 x 3" by 3.5" ports. It recommends tuning to 42 hz.Phew...!
My question is should I alter the port tuning to achieve 42hz as per the eminence design. If so should I shorten the existing 3" ports or would I be better fitting longer 4" ports and shortening until the "rice test" gives the desired result. I don't really want to be cutting new holes and getting bigger ports unless the benefits are worth it - if that's the sound the box gives me perhaps I need a bigger box!
I'm using a 77 Jazz into an Ashdown ABM 500 EVO, any help would be much appreciated!