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need a visual model for CAL's

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an-eagalach

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Post Sat Dec 22, 2007 6:28 pm

Speaking of trapezoids... Is there some sonic or other benefit to the trapezoidal shape? What would happen if you just did a rectangle?
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OBI56

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Post Sat Dec 22, 2007 7:37 pm

The shape and dimensions of the amazing's baffles were of critical importance. Since the 4 woofers were identical and were not used in a traditional way (no box), their front and rear outputs cancel each other out at most frequencies. The slant on the 1 side was to stagger these cancel out frequencies and thus re-enforce those frequencies was determined through a series of complex calculations as much as the actual woofer parameters were well out of the norm. In fact, the manufacturer who made these refused to build them at first, their acoustical and electrical properties were so weird. Bob Carver had to assure them over and over again that this was the exact design he wanted before they would build them.

This was why I was so adamant in asking for exact dimensions and mounting hole positions of the speakers at the beginning of this thread rather than asking for pictures.

I seem to remember some sort of technical document on here explaining Bob Carver's thinking when he designed and built the Original Amazings. Should really try and find a copy of this to read again.

Marc ....
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an-eagalach

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Post Sat Dec 22, 2007 9:45 pm

I see what you mean. Maybe audioassassin or some other kind soul could drag out the tape measure and give us the four-side dimensions, plus the relative locations of the speakers. That, plus the visual aid of the great snapshots will put me in motion.
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audioassassin77

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Post Sat Dec 22, 2007 10:36 pm

an-eagalach wrote:I see what you mean. Maybe audioassassin or some other kind soul could drag out the tape measure and give us the four-side dimensions, plus the relative locations of the speakers. That, plus the visual aid of the great snapshots will put me in motion.


if thats what you need, no problem.
little on the drunkin side tonight tho.
in the AM(PM if bad hungover) will run a stringline to provide correct centers.
will also provide correct, accurate dimensions.


Marc.
if you were to follow the same angle, only on a smaller trapazoid(with 2 woofs) would the wave cancellation factor not be the same?
.....a VULGAR DISPLAY OF POWER.

I am slowly going CRAZY 123456 switch..CRAZY going slowly am I 654321 switch.
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OBI56

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Post Sat Dec 22, 2007 11:07 pm

an-eagalach wrote:I see what you mean. Maybe audioassassin or some other kind soul could drag out the tape measure and give us the four-side dimensions, plus the relative locations of the speakers. That, plus the visual aid of the great snapshots will put me in motion.


AudioAssassin has Silvers (3 woofers); I thought you were building Originals or Plats (4 woofers).
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maddmaxxx

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Post Sat Dec 22, 2007 11:19 pm

-pretty sure he, [mraa77]...gots al3's and originals
-* © Küül ®™ /mx...
-Too hip gotta book
-"Don't BAN me Bro!"...el/doro
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OBI56

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Post Sat Dec 22, 2007 11:26 pm

DUH!!!! I must be drunkener than AA77 Maxxx. ](*,) ](*,) ](*,) You are correct; he just bought a pair of originals a few weeks ago and has a bad ribbon to fix or replace. I have no idea why I even thought that he had Silvers ....
Last edited by OBI56 on Sat Dec 22, 2007 11:37 pm, edited 1 time in total.
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OBI56

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Post Sat Dec 22, 2007 11:32 pm

audioassassin77 wrote:Marc.
if you were to follow the same angle, only on a smaller trapazoid(with 2 woofs) would the wave cancellation factor not be the same?


Not quite Kris. The angle and spacing were calculated for the specific woofer parameters and for 3 woofers, not 2. I know that I have some technical info about how he ultimately arrived at those specific measurements, but for the life of me, I can't remember where I put it. I'll have to look for it in the morning.

Marc .....
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audioassassin77

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Post Sat Dec 22, 2007 11:32 pm

maddmaxxx wrote:-pretty sure he, [mraa77]...gots al3's and originals


Dead on ...mx.
Mr.OBI-san i currently own a pair of MINT oak ALIIIs and a pair of Very(!) mint Originals(except for one broke-dick ribbon).
on this note:
(have to ask again) anyone here want to part with a(prefer 2, need one for a center!)30" ribbon?
all i need is two 30"ers and another pair of ALIIIs and ill have completed my 7 channel ribbon dream \:D/ .

(DAMN.please excuse, VERY full of Christmas cheer right now)
CHEERS!
.....a VULGAR DISPLAY OF POWER.

I am slowly going CRAZY 123456 switch..CRAZY going slowly am I 654321 switch.
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DaveS

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Post Sun Dec 23, 2007 12:39 pm

I still have one right side panel that is free for the taking. I`ll take it to the UPS store and have them pack it, you pay for packing and shipping it`s yours. Sent collect. Better yet come and get it.
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OBI56

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Post Sun Dec 23, 2007 5:35 pm

Dave, where exactly are you located? I keep getting this distince impression that you are either in Oregon or Florida for some weird reason, but I think that you are actually in NYS.
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DaveS

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Post Sun Dec 23, 2007 6:36 pm

Florida right now NY in the summer.
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engtaz

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"TAZ"

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Post Sun Dec 23, 2007 6:56 pm

Where in Florida????

engtaz
engtaz


Carver M4.0T in front channels to Caver AL VI's in SACD & 2 Channel setup
C 16, PT 2400, Slim Device, Carver TX-8, 490T and Rega TT w Grado Gold cart in the 2 channel setup
Bogen SRB20 is computer amp
Carver PM-350 donated for youth church use
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DaveS

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Post Sun Dec 23, 2007 7:26 pm

You wouldn`t know you`re up there in Yankeeland. \:D/ \:D/ \:D/ \:D/












Cape Coral
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audioassassin77

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Post Wed Dec 26, 2007 5:28 pm

an-eagalach wrote:I see what you mean. Maybe audioassassin or some other kind soul could drag out the tape measure and give us the four-side dimensions, plus the relative locations of the speakers. That, plus the visual aid of the great snapshots will put me in motion.


boy.
must be the holidays to have the shakes this bad #-o .
hope i havnt held you up too muck 8-[ .
here goes for your measurements
(all taken from right side pannel( straight side on left)
top left to top right~ 27"
bottom left to bottom right~ 34"
(my degree finder is at work and im not. if you need it i can get the exact angle for you next year \:D/ .)

ribbon cutout centerline is 3 3/4" in from straight(non angled) edge of pannel.
cutout is 3 1/2" wide.
cutout is 4 3/4" up from bottom of pannel
woofer center is 15" in from vertical side of pannel.
15 1/4" to center of bottom woofer when measured from bottom of pannel.
hope this helps get you started!
good luck!
.....a VULGAR DISPLAY OF POWER.

I am slowly going CRAZY 123456 switch..CRAZY going slowly am I 654321 switch.
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