Mono fullrange speaker DIY sandwich cone and self made whizzer cone.
In a marble box from the stonemason. Due to communication error he made the walls 4cm thick instead of 2cm.
https://www.diyaudio.com/community/threads/rcf-21-woofer-lf21n451.405626/post-7510921
https://www.diyaudio.com/community/threads/how-to-make-a-whizzer-cone.398063/
https://www.diyaudio.com/community/...loudspeaker-sandwich-cone.402917/post-7443476
It's for Bluetooth music for smartfone use. Think about driving it with a current driven amplifier with LM1875
In a marble box from the stonemason. Due to communication error he made the walls 4cm thick instead of 2cm.
https://www.diyaudio.com/community/threads/rcf-21-woofer-lf21n451.405626/post-7510921
https://www.diyaudio.com/community/threads/how-to-make-a-whizzer-cone.398063/
https://www.diyaudio.com/community/...loudspeaker-sandwich-cone.402917/post-7443476
It's for Bluetooth music for smartfone use. Think about driving it with a current driven amplifier with LM1875
Visaton BG20's in some 0.5 ft^3 sealed nearly-cubes (meant for integration with sub). Birch veneer plywood, natural stain with satin poly finish.
https://www.diyaudio.com/community/threads/visaton-bg20-8-full-range-driver-sealed-monitors.405844/
Very best,
https://www.diyaudio.com/community/threads/visaton-bg20-8-full-range-driver-sealed-monitors.405844/
Very best,
Let me try to win Ugliest Prize (though far from my cheapest). The sound of the 6x10 DEW-alnico fullrange is kind of like eating creme brulee -- buttery rich crispy textured. When I picked up a pair early 2022 (one of my first forays into bargain vintage alnico) I was so taken by the sweet-not-sour sound I then "fished" four additional drivers. While I had some success combining OB-U (openback shallow box) with side-firing inductor-BSC, even with a third driver I couldn't reach bass much below ~70hz. Tried bi-amping with a 6x9 auto speaker but the sensitivity gap was ~11dB. Finally, last weekend I ran into the Infinity Kappa 693c fiberglass 6x9 3ohm 94dB close to the alnico. Whipped up a filter to reduce 4ohm alnico mid-hi, keeping (boosting) HF above 9khz, 0.68mH || 2.5ohm || 4.7uF; LPF 3mH @ 160hz 1st-order. The cab is ready-made trapezoidal dual-chamber-6x9; alnico port stuffed, bass port to be tuned later. Total cost about 1200... renminbi or $170 not counting Jantzen XO bits.
Have the cake and eat it too!
Have the cake and eat it too!
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What I was afraid of, may have just happened. Potentially A/A/A (hi/mid/lo) high-fidelity sound for 300... renminbi or ~$40/pr. The guilty accomplices are a modified version of the "English drum paper" Michael's Audio 5" (really 4.5"; different sizes 4-8" variously branded Hifi-bird or Isred) and off-the-shelf 4" (supersized) labyrinth. Earlier I had "stacked" the regular version of this driver with another brand's 5" of identical frame but complementary frequency response, called micor55. When I went back for a spare set I was offered the "upgrade". Indeed the midrange was much fuller and the (amazing) dynamics still intact, but the overall transparency and 3D of the original were missing. Scratching my head, I unsealed the roll of 2in automotive "plast" tape and scissor-cut a pair of fan shapes, which self-attached to the drivers' dustcap rim. Tone-sweep and trim... HF flat and whizzer had no distinguishable sound of its own. The 7.5L cabs were cheap but well-built. I simply inserted through the driver cutout a piece of thick cardboard at a slight angle to make a tapered/stepped transmission line of ~1.1m length (quarterwave frequency ~50hz due to taper/mass-load). Comparable to my SB Satori 2-way at 20X the cost....
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You think that's ugly? I think some horns with babybelle cheese wax as filler are my ugliest speakers, anyway I'm off now to Google Infinity Kappa 696C drivers.Let me try to win Ugliest Prize (though far from my cheapest). The sound of the 6x10 DEW-alnico fullrange is kind of like eating creme brulee -- buttery rich crispy textured. When I picked up a pair early 2022 (one of my first forays into bargain vintage alnico) I was so taken by the sweet-not-sour sound I then "fished" four additional drivers. While I had some success combining OB-U (openback shallow box) with side-firing inductor-BSC, even with a third driver I couldn't reach bass much below ~70hz. Tried bi-amping with a 6x9 auto speaker but the sensitivity gap was ~11dB. Finally, last weekend I ran into the Infinity Kappa 693c fiberglass 6x9 3ohm 94dB close to the alnico. Whipped up a filter to reduce 4ohm alnico mid-hi, keeping (boosting) HF above 9khz, 0.68mH || 2.5ohm || 4.7uF; LPF 3mH @ 160hz 1st-order. The cab is ready-made trapezoidal dual-chamber-6x9; alnico port stuffed, bass port to be tuned later. Total cost about 1200... renminbi or $170 not counting Jantzen XO bits.
Have the cake and eat it too!
View attachment 1238286
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