Seas FA22RCZ full range project

[mteinum]

I notice in your pics a metal ring that appears to secure the spider to the frame, but I havent seen that in the Madisound pics or the ones on the SEAS website. Can you comment on what it looks like it does? Is it aluminum or some other metal? Thanks

You can find high rez pictures here:

Seas H1597 FA22RCZ - a set on Flickr

That metal ring looks like acrylic. I will take some more pictures of this and add to the set above.

 

[Joachim Gerhard]

That acrylic ring is called Spider Ring and it was developed by SEAS to center the spider.
As far as i know the idea came by working with the Klippel. The linearity of the Spider is very important for sound quality.

 

[mteinum]

What will happen if i mount them on a open baffle, lets say 1220x1220mm center the driver and put each baffle 45 degrees in a corner?

Will there be any bass out of that?`

 

[hm]

mteinum,
never take the center of OB for the driver,
in your case ~300 Hz you will get a dip of ~20 dB
out of Klinger, 1983 OB tests side 91

 

[Scottmoose]

What will happen if i mount them on a open baffle, lets say 1220x1220mm center the driver and put each baffle 45 degrees in a corner?
Will there be any bass out of that?

Depends what you regard as decent bass output.

Combined response of the Seas centrally positioned on the 4ft x 4ft baffle you mention across a room corner (small gap to either side). 1m on-axis. Excuse the HF roll-off; I forgot to remove a low-pass filter when I ran it through MathCAD. OK for giving you an idea of what it's doing at the bottom end though. Personally, I'd rather use it on a smaller baffle crossed to a couple of 15in woofers below ~500Hz, but YMMV.

 

[nicoch58]

edge.exe by john k
xlbaffle.xls by Thorsten

 

[nikko03]

I see some nice ideas coming up here i realy appreciate all the input in this thread
My loudspeaker has now played music for a couple of days. And the bass respons is getting better and the tweeter seems better too.

 

[planet10]

edge.exe by john k

Edge is not John K's. It is written by Svante Granqvist.

dave

 

[nikko03]

I was wondering does anyone dear to sugest a horn construction for this driver.
its so many constructions out there and i tought many of you have som experience with some of them
I know this is difficult of course but maybe someone have a good gut feeling about one of the universal designs out there

 

[nicoch58]

planet10 never sleep


abc_dipole.zip

 

[mp9]

how about the jerico? it works with the exotic.

i can only guess about the g-chang or curvy chang.

 

[mteinum]

...I ran it through MathCAD...

Hi Scottmoose,

I have just bought a DIY license for the worksheets. Which one did you use to model the OB?

 

[Scottmoose]

Single driver open baffle, as no bass units were specified.

 

[nikko03]

how about the jerico? it works with the exotic.

i can only guess about the g-chang or curvy chang.

I saw the exotic was used with the jerico horn. Does anyone know if there where done any changes to the jerico to adapt it to the exotic driver.

 

[mteinum]

Single driver open baffle, as no bass units were specified.

Thanks a lot!

I did some simulation moving the speaker upwards on the baffle:

(file: OB_2_Drivers_Corner_Active_1_30_10.mcd)

High Pass Filter, fHP = 0 Hz

 

[nikko03]

The simulation with ydc=28 zdc=40 looked nice it seems putting it higer will take away from the bass respons but even out the respons further up.

 

[mteinum]

I have to double-check my numbers the next time

1220mm = 48 in, not 56

Here is a new sim with a 48x48 baffle. I will make a proper cab for this driver, but there are some people coming over next Saturday - and no baffle was no fun...

 

[borispm]

Is this going to work well in quarter wave transmission line? I guess a single folded transmission line floorstander of ~1.3m (line length of ≥2.6) would be nice.

 

[nikko03]

I have to double-check my numbers the next time

1220mm = 48 in, not 56

Here is a new sim with a 48x48 baffle. I will make a proper cab for this driver, but there are some people coming over next Saturday - and no baffle was no fun...

I see but it still look best to move the driver somewhat up on the baffel
but not to high
Are you going to try it in your dallas horn's to next saturday?
I am very curious to hear what you think of it in the dallas horn you know

 

[JoniR]

I was planning to try these speakers in OB baffle like Wharfedale SFB, but with custom dimensions(WxH) 700mm x 650mm with (WxH) 250mm x 630mm wings. Attached picture is model from plan.
I almost ordered sheets for prototype but then I starting to think that should I increase height of baffle? I can't do any wider baffle but higher baffle is possible up to 1800 - 2000mm. Is there any sense to increase height?
So maybe I change my plans and try first Papa's like baffle which are also mentioned in this theard.

I already ordered pair of FA22RCZ but they was sold-out from Finnish distributor, so I need to wait few weeks. All comments are wellcome.

-JoniR