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Yet Another (3rd!) Way to Construct a 28" Spherical Shell...

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TNRabbit

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(pair of) SILVER-7 TUBE AMPs

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Post Sun Jun 03, 2012 11:40 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

Every time I look at that, I think "Terry's Chocolate Orange"....LOL

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TNRabbit
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From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.
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jjptkd

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Post Mon Jun 04, 2012 7:50 am

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

Wow, very nice, congrats on getting them done!! =D> =D>
Sunfire TGP-III
Sunfire 405x5
PS Audio DL-III DAC
Klipsch Chorus II's
Klipsch RSW 15
Klipsch KW-120 (2)
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MRHP

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TFM-75

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Post Mon Jun 04, 2012 8:36 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

That looks great elgrau, nice job!

So how many ohm's are the sphere's? :-k
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65
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elgrau

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Post Mon Jun 04, 2012 8:56 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

How sweee**eeet it is: pulled the driver and it was just the wire pulled loose from the crimped spade connector (wire was a bit short so I guess it stretched a bit when I "stuffed" the enclosure with damping insulation). Will extend the wire and re-spade it and be in business: done and done! Great! Stoked...next stop is the mk-II "trial"!

Have not measured them yet (vs freq), but based on them being a little less R than the ~6 ohm 6.5" sphere's, I'd say 5 to 6 ohms impedance, MRHP.
Last edited by elgrau on Tue Jun 05, 2012 2:45 pm, edited 1 time in total.
Family room: 400 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.
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MRHP

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TFM-75

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Post Tue Jun 05, 2012 8:12 am

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

Im thinking of building my own set of conventional speakers for the fun of it. Where did you buy your crossovers.
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65
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elgrau

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Post Tue Jun 05, 2012 11:23 am

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

The basic EPI "module", of one 1" inverted dome tweeter and one 6.5" or 8" woofer, only requires a ~10 uf cap on the tweeter leg to achieve a "natural" roll up of the tweeter (and of course protects the tweeter from destructive LF energies) at ~1800 hz where the woofer mechanically rolls off. I use 6 of these woofers and 8 of these tweeters (not EPI but humanspeaker.com's new replacement line of PRO drivers that pretty much match the EPI driver specs - not sure which is better: the old original EPI drivers from ePrey or new PRO drivers....stay tuned!), with each leg wired in sets of equal // drivers wired in series. So the only external (the driver VC's add LCR to the circuit) crossover component is this one cap. For these sphere's I used an audio grade 8 uf 200V Kimbercap from Parts Express (~$30), MRHP
Family room: 400 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.
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PDR

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TFM-45

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Post Tue Jun 05, 2012 4:05 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

MRHP wrote:Im thinking of building my own set of conventional speakers for the fun of it. Where did you buy your crossovers.


Try Parts Express they have a guide.... http://www.parts-express.com/resources/ ... peaker.cfm

And they have a list of projects that others have built and supplied info.... http://www.parts-express.com/project-ga ... -projects/

Have never tried one but have good things from people that have......good luck.
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MRHP

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TFM-75

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Location: Buzzard Creek Ky

Post Wed Jun 06, 2012 8:34 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

Good info elgrau and PDR....thanks!
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65
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elgrau

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Post Wed Jun 06, 2012 9:16 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

I rotated the handles to the sides and shellacked the chrome handle bases to give them an amber hue that makes them blend in more with the finish. Thought them too "out there" before. Sound is fantastic, even at low "tweeter break in" levels. Will open them up soon and also try the mk-II on them as well. Guess I'll have to build the matching pair one day.... Definitely clearer and more detailed then the 6.5" woofer version:

IMG_3634 (Medium).JPG
Family room: 400 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.
<<

elgrau

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Posts: 2896

Joined: Wed May 31, 2006 9:33 pm

Post Wed Jun 13, 2012 11:57 am

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

Why do I always get f'd in the ass?? lol...I'm "locked in" to teak if I want them to match ](*,) I'll bet Obama is behind these "regulations"....


Hi Ed,

The price of teak has gone through the roof due to regulations on it's
import. It is very difficult to locate now and while we may be able to
supply you with a sheet when you are ready the cost will probably be much
higher than what you originally paid.


-----Original Message-----
Sent: Tuesday, June 12, 2012 1:00 PM
To: info@monsterwoodshop.com
Subject: Contact Us Submitted


Comments or Questions: Hi,
I purchased 10 mil Teak wood veneer from you several months ago for an audio
speaker project. Don't need another 4'x8' sheet right now, but will
eventually (~2-3 months or so) to veneer the matching stereo speaker to this
pair... I hope you're just out of stock for Teak wood veneer right now and
will eventually have it back in stock?
Thanks,
Ed
Family room: 400 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.
<<

TNRabbit

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(pair of) SILVER-7 TUBE AMPs

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Location: TN Native Languishing in VA

Post Wed Jun 13, 2012 12:55 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

That's what you get for not buying made in the usa...
TNRabbit
Image

From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.
<<

elgrau

SILVER-7 TUBE AMP

Posts: 2896

Joined: Wed May 31, 2006 9:33 pm

Post Wed Jun 13, 2012 2:06 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

Yeah; who new? (where in the f teak wood comes from..China? Brazil? Some other facist hell-hole? The - God forbid - Amazon rain forest? If so, I'm totally fucked...Obama's libtards don't want those poor bastards to make a living doing ANYTHING. Just starve to death!). Could have went with good 'ol American walnut for ~ the same price, but that's such an over done wood for speakers...IMO :rolleyes:
Family room: 400 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.
<<

elgrau

SILVER-7 TUBE AMP

Posts: 2896

Joined: Wed May 31, 2006 9:33 pm

Post Sat Oct 13, 2012 6:19 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

My schedule for having speaker #2 done was "born" 31 days behind schedule about three weeks ago (I started AOS-III #2 around the end of June..). Was taking too long (i.e., I was being too lazy and un-motivated) so I made a schedule. Hit it pretty hard the last few days and I'm now only ~8 days behind schedule (for an end of November completion date - all based on supporting this project at an average of ~6 hours per week). Here is pic of all 32 "slices" assembled and tapered on one side (need about 10 minutes per slice to do the side two tapers...~9 passes each thru the Dewalt power planar) with the completed wire harness(es) and x-over cap, "bi/shotgun" mode wiring switch, and terminals - all sitting on the two boxes of 14 Humanspeaker.com PRO drivers. All told I will be about 40 hours into it after side two tapering is complete, with about another 40 hours needed (with the bulk of that time for veneering...) to finish this match to AOS-III #1, which is pictured earlier in this thread :

IMG_3676 (Medium).JPG
Family room: 400 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.
<<

elgrau

SILVER-7 TUBE AMP

Posts: 2896

Joined: Wed May 31, 2006 9:33 pm

Post Sun Oct 28, 2012 4:29 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

Ok; FINALLY figured out the last "issue" re assembly of the 32 "slices" into the spherical shell. For the 1st one, I had headaches trying to keep the slices in place in the jig because if a slightly "taller" slice was added, it would push the top of the jig up and ALL the other pieces would fall away from the jig (that pesky gravity...lol). Solved that issue by running a threaded rod from the top of the jig to the bottom (see pic 1). Now, I can tighten the tension in this rod and that keeps pressure on ALL the slices (and for the ones slightly "taller" - due to assembly tolerances - they just "bow out" a bit more but have no effect on the tension in any of the others! So all slices can be set and held in place. When the circumferential strap is tightened to close the gaps and with glue applied to each seam, you simply loosen the tension in the rod to allow each slice to "breath" and find its natural position.

The other issue that was causing gaps in build #1 was due to me mistakenly assuming (makes an ass from u and me...) that the way to minimize the taper angle differences between the LHS and RHS faces of each slice* was to "stagger" them: one "up" then the adjacent one "down", etc. But this is 100% wrong. Let's say the LHS face taper was 6 deg. and the RHS taper was 5.25 deg. With the aforementioned way you get a total joint angle of 12 degrees (6 + 6) followed by 10.50 degrees (5.25 + 5.25), and so on. This "reeks havoc" and leads to gapping in ~every other of the 32 joints around the circumference (which I fixed in build #1 using very strong epoxy...but spent a bunch of wasted time doing this...). With all the slices oriented in one direction, THEN each joint is the required 11.25 degrees (5.25 + 6)...which equals VERY tight seams and NO gapping! Horay! Also, this time I'm only glueing 8 slices at a time: remove 4 slices - every other one of the 8 - (with rod tension holding the rest safely in place...), apply glue to both faces, slip them back into place, tighten the circumferential band (as you loosen the tension rod...). Simple, fast, and precise: no "panic mode" as before as you rush to get ALL of the slices glued before the ~30 minute wood glue "sets"... With just 4 slices to apply glue to at a time, each slice is carefully positioned leading to MUCH less surface sanding when sphere is complete! We learn by doing...lol! So glad to have this last "hurdle" overcome in the construction of sphere #2....will soon be cutting driver holes, teak wood veneering, installing wiring, drivers, etc.: all the "fun stuff"! - Ed

IMG_3678 (Medium).JPG


IMG_3679 (Medium).JPG



*Taper angles are slightly different on each face of a slice because I have a separate taper jig to hold the slice for each taper as it goes thru the DeWalt planer: a 5.625 degree jig for face 1, and then a 11.25 degree jig for face 2 (because now the 1st face is tapered at 5.625 degree and I need 5.625 degree "more" which equals a total taper of 11.25 degrees. With tolerances, neither taper jig will be "spot on" either 5.625 degree or 11.25 degrees). But the SUM will be the same for each of the 32 joints and very close to the required 11.25 degrees with the new proper way of orienting each slice...
Last edited by elgrau on Sun Oct 28, 2012 7:46 pm, edited 5 times in total.
Family room: 400 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.
<<

TNRabbit

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(pair of) SILVER-7 TUBE AMPs

Posts: 13338

Joined: Sun Jan 14, 2007 11:53 am

Location: TN Native Languishing in VA

Post Sun Oct 28, 2012 4:41 pm

Re: Yet Another (3rd!) Way to Construct a 28" Spherical Shel

Ed, I think you should make a pair that look like old WWII underwater mines~

This guy made one into a woodstove:

Image
TNRabbit
Image

From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.
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