Share pics of my latest loudspeaker design

[rcavictim]

Hi All,

After months of making MDF dust I have finally put my latest experimental loudspeaker design into my living room for fine tuning and critical evaluation. These are fairly nice! Each cabinet contains five sand damped chambers containing a total of 125 lbs. of dry sand per cabinet and weighs 300 lbs. I was very pleased that the bass directionality I have achieved deals very nicely with what was a huge room-boom problem. Bass response is very smooth. The lowest bass falls together right at the listening position while not rattling the adjacent kitchen or the rest of the house as did all previous speakers in this room. These are definitely keepers! Efficiency is unmeasured (still lack the necessary reference or calibrated SPL meter) but very high. I get all the slam I was after from a low power tube amp. Since these appear to meet the criteria my intensive R&D has been striving for in a saleable product, i.e. hi-quality sound, full-range response ideal for music but also outstanding for two channel home theater (no sub required), high-efficiency and unique artistic design, I may offer this product commercially.

Note that the height and lack of a large top surface will discourage the accumulation of decorative crap. These are Guy Speakers!

[rcavictim]

Another view.

[Taco]

Very nice work, what type of driver you use? Car drivers or something?

[maxw]

sheesh, those are pretty intimedating. Exterminate! Exterminate! like Darleks

But seriously, nice work!

[jdybnis]

Would you tell us a bit about them? What kind of enclosure is the bass? I'm curious to the effect of the inward pointing woofers. Are they in phase with each other? What were your design goals? And, how do they sound?

[rcavictim]

Originally posted by jdybnis
Would you tell us a bit about them? What kind of enclosure is the bass? I'm curious to the effect of the inward pointing woofers. Are they in phase with each other? What were your design goals? And, how do they sound?

There is a LOT of engineering in this complicated cabinet with many ideas dovetailed together to form a very unique synergistic system. It took me three years to come up with this design and I don't want to give it all away since I hope to make money with it. I'm sharing pictures as the title of the post says, not blueprints, schematics or building instructions.

My design goals were outlined in my introductory post. In a nutshell to design the very best full-range, high efficiency loudspeaker that I can given the materials that I can presently afford to buy.

The unusual woofer placement forms an acoustical LP filter as part of the crossover scheme, in part to raise speaker sensitivity. The woofers operate in tapered TLs.

How do they sound? I feel that my considerable efforts have been amply rewarded!

Thank you to those who complimented my work!

[navin]

jeez...those things make the TV look small. how big is your room? they look ver very big.

BTW do I see a nice vintage TV at the bottom left of "dunleft"

[rcavictim]

Originally posted by navin
jeez...those things make the TV look small. how big is your room? they look ver very big.

BTW do I see a nice vintage TV at the bottom left of "dunleft"

At 75" tall and 36" wide the speakers do rather dwarf the 61" (diagonal screen measurement) RPTV. This helps demonstrate where my priotities are. The living room/dining room area is not large, just average. I cannot get the couch as far from these speakers as I'd like to. I have a better speaker testing room in the basement with good acoustic treatment but it is already choked with other large prototype speakers now and the last set were so very good they became permanent fixtures.

Good eye! The vintage set is a 10" round CRT RCA 721TS from circa 1947. I worked hard to assemble a fairly nice vintage TV collection of about 60 early round screen only sets. I had to travel to the US to acquire most of them as Canada didn't have TV until 1952. Half of these sets were proudly on display in my living room until I needed the space for sound system testing so I had to shuffle them to other places throughout my small home. The front door and hallway are no longer useable because of TV storage.

[thylantyr]

[ScottG]

"I cannot get the couch as far from these speakers as I'd like to."

no doubt.. two lines with a point-source tweet in an MTM arrangement SCREEEEEEEEEeeeeems F A R F I E L D. You might instead consider a TMM design with the tweeter just below the listener's vertical axcess and inverted so that the polar tilt is upward toward the midrange line and the listener's head.

The dovetail channel is rather strange, not as an acoustic low-pass filter but because of the off-axis dampening in the midrange.

Excellent fit'n'finish! (Cudos.)

Name suggestions:

Mayan's (reminded me of a mayan temple, in fact when I first saw them there appears to be an alter in front but the only sacrifice seems to be remote controls.. Kinich Ahau wants a better sacrifice than that.)

or

Vulcan's (with the red sides also resembles an active volcano)