it it worsens the cavity peak, or creates a not so funhouse of suckouts, then it can be subjectively and objectively worse than a perpendicular or canted panel above the speaker baffle.
I think cavity depth and aspect have some consequences vs the tapered aperture as my tall K18 with a curved reflector has little problem in the 200-500Hz region whereas a K15 size box with 3 panel approximation and about the same cavity depth as K15 exhibited a response hole. Adding a front "shelf" board like K15 has corrected / shifted some of that problem.
How might one logically approach getting a good cavity and reflector system just by knowing roughly the front chamber "volume" ?
This 18" cabinet sounds quite good even with the slotted pipe mounted "inside" the
front chamber
I think cavity depth and aspect have some consequences vs the tapered aperture as my tall K18 with a curved reflector has little problem in the 200-500Hz region whereas a K15 size box with 3 panel approximation and about the same cavity depth as K15 exhibited a response hole. Adding a front "shelf" board like K15 has corrected / shifted some of that problem.
How might one logically approach getting a good cavity and reflector system just by knowing roughly the front chamber "volume" ?
This 18" cabinet sounds quite good even with the slotted pipe mounted "inside" the
front chamber
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the problem with any form of cutout like that is that at some point it will introduce a half wave hole. if you limit it solely to bass frequencies you should be fine, but as shorter wavelengths are introduced, problems arise. djk spoke sharply against Karlson stuff...I know youre its evangelist...but literally no one has even attempted to bother with the topology, why continue with it?
Hi snappyturtle
DJK suggested the Karlson on several occasions for "kick bin" duty.
FWIW I did not have a horrendous hole with the 18" box and subjectively
several Karlson sounded "better" in the voice range to me than the same drivers as direct bass reflex radiator. They can go very bad balance wise with poor choice of driver (too heavy) or too much BSC in the lowpass.
I look at them as a substitute for midbass horn and not relegated
to bass.
41.5" tall K18 with curved reflector - that's an Eminence built 18 - its run 3 different 18 and all good.
I should have tried my Altec and JBL 15s but health hasn't been great.
K-type with 18" built like the 2nd K12 (~1956) - later a stub was added to the top. These same "wings" when swiveled inwards at the top to tighten the initial gap sounded congested. Measurements showed little difference.
115BK - zero damping materials - EVM15L - mic on ground. It has roughly 3 cubic foot of airspace.
DJK suggested the Karlson on several occasions for "kick bin" duty.
FWIW I did not have a horrendous hole with the 18" box and subjectively
several Karlson sounded "better" in the voice range to me than the same drivers as direct bass reflex radiator. They can go very bad balance wise with poor choice of driver (too heavy) or too much BSC in the lowpass.
I look at them as a substitute for midbass horn and not relegated
to bass.
41.5" tall K18 with curved reflector - that's an Eminence built 18 - its run 3 different 18 and all good.
I should have tried my Altec and JBL 15s but health hasn't been great.
K-type with 18" built like the 2nd K12 (~1956) - later a stub was added to the top. These same "wings" when swiveled inwards at the top to tighten the initial gap sounded congested. Measurements showed little difference.
115BK - zero damping materials - EVM15L - mic on ground. It has roughly 3 cubic foot of airspace.
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