|6th October 2017, 05:35 PM||#11|
although I don't think it would be louder down low than a regular 6th order assisted reflex , a Karlson 15 run per Exemplar makes an articulate subwoofer and an existing K15 can be modified with no cutting of the cabinet.
Two 3" ID PVC elbows would mount to a board which covers the port and that board screwed and sealed over K15's port. That drops the system tuning from the mid-upper 40's to around 29Hz. A low fs Altec 515 or 416 is used. Apply some boost at Fb, xover as usual where it sounds best with the upper speaker.
always brace K15's back panel. Even a single strut from the rear shelf is pretty effective. The wings can be easily braced with struts extending from the front shelf. (I've used 3.5" long pieces of dowel rod)
when built to spec, the mod is reversible, leaving all the goodness of K15
a tall, folded ~20Hz path tapped pipe with good 15 would be interesting too. Driver needs to be offset to prevent a deep notch. This pipe for a cheap 12" is around 5 foot tall. That aperture is squeezed too much for playing sine wave but fine for music. Ask TB46 to calculate a 15" version if you've a woofer in mind.
Last edited by freddi; 6th October 2017 at 05:47 PM.
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