current versions

version #2 cd cases in place to extend baffle because the left-over pieces from the version #1 larger baffles fit perfectly into the 6"pvc ! lololo

i have mistakenly posted that the driver is a 5" but it is actually a 4" !

the other end is just as short ! lolol

6"pvc x 48" 2-way speakers 35" from rear wall/10' apart and 12' each from listening position.

plot for 12" x 48" tube

view inside 12" tube prior to cutting k-slots showing center hole for 8" driver..

proposed stand and baffle shape for further smoothing transition of k-slot to room.

back of tube showing polyfill stuffing.

back of tube shown prior to stuffing.

12" tubes with single full-range 8" driver rs 1286c with about 2lbs plumbers-putty on magnet/basket and thick felt sections glued to inside of basket legs. also has 6 coats of rave super-hold on cone and 3 coats on whizzer.

early idea for speaker

12" tubes with baffles mounted and prior to cutting k-slots.

excellent illustration done by jrutter. thanks jr !!

version #5 rs1297c in 10"x6'pvc

1/2"pvc sched 200 on platter and 3/4"pvc sched 40 attached to vacuum motor. note o-ring on 1/2"pvc section that slides into the 3/4"pvc vertical section. the o-ring fills the gap and makes a seal.

speakers in place for listening and b&w cabinets visible that still contain the xover. k-slot was closed at the center at first but is now open 3/4" as this is the smallest opening a 20khz wave can pass through and the imaging became more focused.

rs1297c speakers currently being used for ht system

original perforated canister wrapped in duct-tape to make vacuum chamber. note ground-screw attached to pvc fitting for discharging static through powercord ground. polyfill stuffing is for sound absorption. vacuum chamber is also filled with polyfill for absorption/evaporation of fluids. may add capture-jar later.

version #3 showing the 2 b&w 8" drivers and the 1" tweeter.

rs1297c inside shot

exhaust-port for vacuum motor. note the hinge outline on the cabinet door and the crude box that housed my variac. the box/variac and cabinet door came from the dumpster.

straight-on view of version #3

Image

motor and mount assembly from thriftstore tt. had to put it on top as there was no room in the box and used the 12"pvc ring for cosmetic purpose only.

version #4 with scan speak subs

Image

detail of velvet-covered slot and hole that fits over spindle to keep vacuum arm from rotating with the record. slot is 11cm long and about 2mm wide made with 2 stacked cutting disks on my ryobi hobby tool. velvet is adhered with double-sided tape from hardware store.

version #4 speakers in listening position

cobbled stand from a bunch of leftover parts !

newbies plot numbers for 63" x 9.75" ellipse