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Old 19th February 2007, 05:57 PM   #401
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It's part of the tuning. Remember we're not really using either horn or QW action here -just borrowing some of the math to shape & size the waveguides. 1/8 wavelength gives a load about right for our purposes.
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Old 20th February 2007, 04:25 AM   #402
Tyimo is offline Tyimo  Hungary
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Quote:
It's part of the tuning. Remember we're not really using either horn or QW action here -just borrowing some of the math to shape & size the waveguides. 1/8 wavelength gives a load about right for our purposes.
O.K. I understand! Thanks Scott!

What about to choose the "horn mouth" size?
Has it some relationship with the classical horn design?

Greets:

Tyimo
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Old 20th February 2007, 07:29 AM   #403
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Quote:
Originally posted by Scottmoose
Vents are taken from regular horn theory to match the reflex alignment, with 1/8 wavelength.
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Old 20th February 2007, 10:47 AM   #404
Tyimo is offline Tyimo  Hungary
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Vents are taken from regular horn theory...
O.K. I see! Horn cut off, etc.....

Thanks!

Tyimo
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Old 20th February 2007, 01:02 PM   #405
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Right. Flare frequency etc.
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Old 1st March 2007, 10:04 PM   #406
stroop is offline stroop  Germany
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HI Folks!

Just thought I'd keep interest alive!

How is Mikasa and Iris going?!

Cheers Stroop
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Old 2nd March 2007, 12:55 AM   #407
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Quote:
Originally posted by stroop
How is Mikasa and Iris going?
I'll get there... base drawings are done, i just need to do the last bits that notate make them enuff to make them builable.

dave
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Old 2nd March 2007, 01:29 AM   #408
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Quote:
Originally posted by vangogh-hk
Oh my dear

It is finally finished.
The first DIY speaker project in my life.
Many thanks to Scottmoose for his advice.
Oh No...., It is not finished yet.
The most important thing is missing... the driver, I am still waiting (and keep waiting...) for the FE126E that I ask one of my friend to buy it for me in Japan. The sole agent in HongKong is selling it at a crazy price and one month lead time.

It really took me more time than I did expected. The most time consuming is waiting each layer of glue on the ply wood to dry until I could stack another. I am using 6 layer of 1/8" ply wood to make each curve section. Only ordinary cheapy ply wood is used in this cabined. I also have to glued up two 1/2" ply wood to get 1" thick pannel. (I can hardly find 1" thick ply wood board in Hong Kong. Imported Finland ply wood board with 1" thickness is rare and expensive here)

I will post the construction process and plan of this cabinets in web later. Here is some photo

http://8audio.com/image/diyspeaker/fruqel2.JPG
http://8audio.com/image/diyspeaker/fruqel3.JPG
http://8audio.com/image/diyspeaker/fruqel1.JPG

Wow, those look scary familiar!!

Graham Holliman Velocity Coupled Infra Bass Speaker?
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Old 2nd March 2007, 10:09 AM   #409
stroop is offline stroop  Germany
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Thanks Planet10!

Appreciate it! You guys are doing an amazing job!

Is the dip in response on the BVR between 200-300Hz a problem or is it curable with a supra baffle?

I read the main goal of the Mikasa was to to smooth this area out, which it looks to have done! I can always add shadow later to fill in the bottom but the midrange is more difficult.

Cheers Stroop
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Old 2nd March 2007, 06:03 PM   #410
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Stroop,

I had a look last night at the state of the drawings, Mikasa is pretty much ready to go. Scott 7 i never did finalize the compression chamber size. With Iris i'm not sure if Scott & i actually finalized the details... i'll need to go thru the note. The number of designs have come so fast 7 furois it has been impossible to keep up.

dave
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