System Pictures & Description / Subwoofer Gallery

You have got a reflex tube, that has a "Y split" right at the exit of the port? How do you calculate the resonance frequency?
 
Finished two more stackers.

GRS15SSW4HE drivers
4 ft^3, 4lbs stuffing (polyfil)
21" x 19" x 22" (15mm pine rough cdx plywood; stud bracing)
57lbs each

DSCF1742.jpg


DSCF1743.jpg


Metrics are from a single woofer, ground plane, 2 meters, to compression at 10~16hz.

GRS 15SSW4HE Stuffed 4ft^3 Ground Plane 2M to Compression at 36V.jpg


GRS 15SSW4HE Stuffed 4ft^3 Ground Plane 2M to 36V Compression Waterfall.jpg


GRS 15SSW4HE DATS 6lb Stuffed Fb T&S.jpg


Very best,
 
C'mon... you knew it was coming, right?

Subs are lab horns. They produce the buh-HASS that guys with 50 Hz boxes can only dream about. The bottoms (kick bins) are fully loaded to 80 hz so they won't run out of excursion, and run up to 300. Kappa Pro 12 drivers. Tops are 2-way passive, with 2x8PE21 and D3300 drivers, 300 hz and up. 40 degree pattern and acoustic centers aligned. Takes a truck and trailer to move, so the whole rig doesn't get used that often - but just half will blow the roof off a typical hotel ballroom.

It's in 'block party' configuration. Naysayers think it's a comb filtering nightmare until they hear it. Clean and smooth for miles in any direction and it images like crazy at a "normal FOH position". For narrower coverage, 2 tops are stacked tweeter to tweeter, and the midbass stacked in a line next to it. Then there's the 'tower of power', where the midbass are v-plated and tops stacked like a pyramid on top - which I've only done once.
Ski? You'd need a damned surfboard to ride the sound they produce. Everyone must leave at peace with the world - given they must all be deaf as a post!