3-way - Tower Speaker Project with Seas Drivers - diyAudio
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Old 6th March 2012, 11:31 AM   #1
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Smile 3-way - Tower Speaker Project with Seas Drivers

i am creating a new set of 3 way speakers, starting with the bass units. (ground up)

now i know there are so so so many varibles in sound and speaker design, and i am looking to make this as simple as possable because of this.

my plan is basicly this,
1 design and create the bass boxes, 2 design and build the rest

i am using Europe Audio <as my chosen drive unit, (looks simple and good)

now i have a few questions (as always) i know there are so many variables and factors that i would need 1000000words to explain, but simple so

one of these in each cab, tuned to 25hz gives -7db at 30hz (right where my room node is.

vented obviously provides far more low end, but i am finding it hard to design, can someone help me
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Old 6th March 2012, 03:08 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

For 25Hz tuning you can use a box from ~ 60L to ~ 90L.

rgds, sreten.
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Old 6th March 2012, 07:39 PM   #3
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Quote:
Originally Posted by WaVeInFoRm View Post
i am creating a new set of 3 way speakers, starting with the bass units. (ground up)
You should start with your main unit (or mid), I would but, that's also viable...
sreten opinion is also a very best for your project.
Also what tools are you using, use a software for that simulation of the box.
Keep cool.

Very similar (simulation) than for the AE10s, with smaller box obvious.

Last edited by Inductor; 6th March 2012 at 08:06 PM.
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Old 6th March 2012, 09:29 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

Personally I'd look at the big picture, not that i don't like the Seas driver.

One thing that comes to mind is :
https://sites.google.com/site/undefinition/tarkus

Low 25Hz tuning is doable if that what you want, but
30Hz is better for both the the Seas and Peerless IMO.

rgds, sreten.
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There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 6th March 2012 at 09:34 PM.
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Old 6th March 2012, 10:41 PM   #5
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zux77.jpg at Free Image Hosting <30 hz tuning

isuso.jpg at Free Image Hosting <25hz tuning

now i know it sounds daft and illogical, but i have a feeling the 25 tuning would be better

here is why, the low note i head inalot of music falls at 30hz if tuned to 25hz that will be a controlled note, if tuned to 30hz that note will be at the point where the driver is comming unloaded,

so if i tune it slightly lower it will save it from being unloaded with most music

the lowest notes on a standerd keyboard is 27.5hz
http://www.sciencebuddies.org/mentor...hys_img024.jpg
so i want it to be able to hint at those frequencys without the driver unloading and flapping about , and i feel the lower tuning will prevent this,
so more controll over the driver around and below the tuning
(i think this makes sence, i find it hard to explain, its just in my mind it does)


however port length is a issue...? when i design the final cabinit at whatever size, is it (example) 3 cubic foot + port area?

have i got the right idea?

also how can i tell what max spl before 35mm xmax is reached?

oh one minor note, Xmax is accadently entered as 6m , i know this doesnt alter the basic sim, but can i say one thing? WOULDNT THAT BE LOVELY if it where true

Last edited by WaVeInFoRm; 6th March 2012 at 11:01 PM.
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Old 6th March 2012, 11:08 PM   #6
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been washing pots and pans for half a year now, got over a grand saved up, im very happy
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Old 6th March 2012, 11:26 PM   #7
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by WaVeInFoRm View Post

so if i tune it slightly lower it will save it from being unloaded with most music

the lowest notes on a standerd keyboard is 27.5hz
if anyone ever plays the lowest node on a keyboard

anyway, why not use a real woofer http://www.sbacoustics.com/index.php...34swnrx-s75-6/
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Old 6th March 2012, 11:51 PM   #8
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Quote:
Originally Posted by tinitus View Post
if anyone ever plays the lowest node on a keyboard

anyway, why not use a real woofer SB Acoustics :: 12'' SB34SWNRX-S75-6
i knew that was comming... it does have a nicer xmax, and more surface is more bass,

however i am looking for a balance between all things, or as much as is possable, and i want to make progress so i have my heart and mind set on that bass driver, mid and treble is tbc

so far in the works these three drivers look like they would match well, with a fairly simple crossover, and they are from the same company, so i can be sure that even if there plots arnt accurate they are accurute unto themselfs..

woofer Europe Audio

mid Europe Audio

tweeter Europe Audio

crossing frequencys at a glance 500hz bass to mid and 3000hz mid to tweeter

that will give a slight few db drop in the 1khz to 3khz range, something that i am not fussed about because i like my ears and i dont like to brighter mid,

the tweeter should take over well, and looks flat with a nice slight peek at 1600hz where my hearing faaaddeeesss out
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Old 7th March 2012, 01:27 AM   #9
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Quote:
Originally Posted by WaVeInFoRm View Post
woofer Europe Audio

mid Europe Audio

tweeter Europe Audio

crossing frequencys at a glance 500hz bass to mid and 3000hz mid to tweeter
Same MID (SEAS MCA15RCY-H1262) and similar xover. Projet ASTASIA
http://gxiberras.free.fr/hifi/Astasi...a_III_89dB.GIF
http://gxiberras.free.fr/hifi/Astasi...a_III_89dB.GIF

Last edited by Inductor; 7th March 2012 at 01:29 AM.
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Old 7th March 2012, 02:12 AM   #10
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thankyou very much for that, it looks smooth enouth to me, and most seas domes seem rougthly the same so i might just go with what feels nice. thanks for the x/o map, that will be the biggy for me as it is so far un ucumplished. 3am now. need sleep

a wise man once said, there is nothing new under the sun
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