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Old 8th March 2012, 12:18 PM   #21
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entering proper driver information...

the program it is requesting BL

which of these from that data sheet is BL ? ? ?
(Bl - The product of magnet field strength in the voice coil gap and the length of wire in the magnetic field, in tesla-metres (Tm).

Magnetic Gap Flux Density 1.23 T
Force Factor 10.7 N/A
Suspension Compliance 0.8 mm/N
Suspension Mechanical Resistance 3.4 Ns/m
http://www.europe-audio.com/document...seas\h1305.pdf
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Old 8th March 2012, 12:52 PM   #22
system7 is offline system7  United Kingdom
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Mate, unless you're the biggest flippin' genius since Albert Einstein, I really can't see you pulling this off. Why reinvent the wheel? Have you looked at Troels Gravesen's SEAS page?
DIY Loudspeaker Projects Troels Gravesen

Check out the 3 way classic and the Poor Man's Strad (which uses your MCA15RCY 5" midrange). He doesn't pick the 10" CA26RFX bass, but plenty of SEAS 27TDC designs there which you could adapt.
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Old 8th March 2012, 11:30 PM   #23
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pulling what off? what do you mean?
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Old 9th March 2012, 01:40 AM   #24
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A TL and BR cabinet design for the seas woofer: Jenzen CA
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Old 9th March 2012, 03:06 AM   #25
Dave R is offline Dave R  United States
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Quote:
Originally Posted by WaVeInFoRm View Post
entering proper driver information...

the program it is requesting BL

which of these from that data sheet is BL ? ? ?
(Bl - The product of magnet field strength in the voice coil gap and the length of wire in the magnetic field, in tesla-metres (Tm).

Magnetic Gap Flux Density 1.23 T
Force Factor 10.7 N/A
Suspension Compliance 0.8 mm/N
Suspension Mechanical Resistance 3.4 Ns/m
Europe Audio
BL is sometimes reported in N/A (newtons per ampere), which is equivalent to T*m (tesla*metres).
BL for this driver is 10.7 in either of those units.
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Old 9th March 2012, 01:10 PM   #26
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i was abit sneeeky and wanted to know fast so i posted the question and got the same answer. i shouldnt have been so impatient

thankyou anyway

i have been working on the cabinet design

i will post a proper diagram soon, i am currently working it all out on paper because for me its alot faster to acount for everything at once and mold designs
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Old 9th March 2012, 02:27 PM   #27
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by WaVeInFoRm View Post
pulling what off? what do you mean?
Quote:
TG
A box of new paper coned drivers from SEAS. The CA22RNX, MCA15RCY and
MCA12RC. And soft domes: 27TDC and 27TFFC. Classic paper cones in new
spider chassis. A box of opportunities - and many hours of work. It takes five
minutes to order a box of drivers and you can spend months and months on
learning the strengths and weaknesses of each driver, trying to find the
optimum points of crossover and the optimum crossover slopes for producing
the best blends of sound that hopefully will integrate the drivers into a coherent
and pleasant presentation. The number of options seems infinite.
Hi,

I assume S7's sentiments are similar to the above. Proper
crossover details and acoustic modelling is painfully lacking.

rgds, sreten.

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Last edited by sreten; 9th March 2012 at 02:33 PM.
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Old 9th March 2012, 11:05 PM   #28
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Quote:
Originally Posted by sreten View Post
Hi,

I assume S7's sentiments are similar to the above. Proper
crossover details and acoustic modelling is painfully lacking.

rgds, sreten.
to be honest that is correct and you are right

however i had a good feeling about my driver selection, so i will be creating these speakers

in my mind baised on the responce curves they will match up quite well.

however to be honest i was unaware of the crossover being such a big issue for a decent sound,
i was just assuming a simple 12db/octave at 500hz and 12/24db.octave at 3000hz would produce a good (but not perfect) result

and complex weeks of testing would produce a more perfect but never absolute, result

correct me if im wrong. speaker building is a quest for perfection, perfection cannot be achived. that is the perfection of imperfection, because it gives birth to the huge range of designs, and there individual carictorised "sounds" (coloring) i dont want perfect sound, it is unobtainable. i will be happy with good sound.

i will cross the crossover bridge when i come to it

all issues aside, this project will be a learning curve and much welcome experiance for me, and what ever result i get will be better than no result.

i welcome this challange

Last edited by WaVeInFoRm; 9th March 2012 at 11:23 PM.
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Old 10th March 2012, 04:00 PM   #29
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loads of paper with loads of diagrams and what i hope is a final design..

the driver moter will remove a small volume from the box, how much rougthly would this be? or do i need to wrap the speaker and drown it (risky and undesireble)

i was estimating it by eye as about 2 liters?
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Old 10th March 2012, 10:14 PM   #30
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ok here is my proposed final design... for the bass section

interior volume 58.75x30x50=88.88liters

length of port: 107.58

port entrance and exit: 13.75x13.75

tuning at: 24.3 hz (requiring final volume of 80.5liters)

8.38 liters being left for driver, 2.5*2.5 cross and T bracing. and padding

external dimentions high=80 wide=35 deep=55

all wood 25mm ply (or mdf) all corners rounded off nicely



here is a rougth scetch up (please excuse my poor angles and reprensentation)
Click the image to open in full size.



and here is the sim (yellow line closed blue line vented)
Click the image to open in full size.
hosting images



are my calculations, and curved port length, in order?

Last edited by WaVeInFoRm; 10th March 2012 at 10:16 PM.
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