Seas 27tdfc + waveguide and Peerless 830870 project

pajazo · 11th July 2005, 09:10 PM

This is my first self-designed loudspeaker project. It uses Seas 27tdfc tweeter with a waveguide bought from finnish loudspeaker supplier. Tweeter's fr with and without waveguide on axis, 30 and 60 degrees off axis is attached as an image.
The woofer is the successor of the well known 850488, 830870.
The enclosure is 7,7 l ported made of 18mm birch board. The external dimensions are 31*23,6*17,6 cm. The port is 50x150 mm and fb is somewhere near 60 hz.
I am very pleased with the results, the sound is balanced and neutral.

pajazo · 11th July 2005, 09:11 PM

The crossove schematic

pajazo · 11th July 2005, 09:12 PM

Final on axis frequency response

pajazo · 11th July 2005, 09:15 PM

Picture of the loudspeaker, the crossover is still sitting on top of the enclosure.

pajazo · 11th July 2005, 09:22 PM

This is the simulated frequency also showing the simulated reverse null. (I haven't yet actually measured it with the tweeter reversed).

C37 · 11th July 2005, 09:57 PM

Looks as lovely as the city in which it was made...

Were did you get the waveguide from?What is made of? Aluminium or something else? You don't often see those around here...

Cheers Pajazo,
Thomas

pajazo · 11th July 2005, 10:03 PM

The waveguide is from hifitalo (www.hifitalo.fi). They use it in their kit aw-10hqi with an aluminum tweeter. It is made of plastic and it's about 22mm deep. The throat opening fits the 27tdfc perfectly.

John Krutke has also made some measurements with the same tweeter but a different waveguide.

AJinFLA · 11th July 2005, 11:28 PM

Hi Pajazo,

I'm going to have to wait to get home to see if I can download the finnish translator on my PC at home. My Finnish is not so strong (pun intended)

. In the meanwhile, if you could e-mail them and let them know that there are raving lunatics desperate for such devices (me in particular) here in the USA, that would be greatly appreciated. I'd hate to have to buy an airline ticket to Finland just to get this thing

.

cheers,

AJ

transducer · 12th July 2005, 12:31 AM

Ooh. I'd love a pair too, for my Seas 27TDFC.

Ron

DSP_Geek · 12th July 2005, 05:18 AM

GROUP BUY!

12th July 2005, 05:18 AM	#10
DSP_Geek diyAudio Member Join Date: Aug 2003 Location: Santa Cruz, California	Dare I say it? GROUP BUY!

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11th July 2005, 09:57 PM	#6
C37 diyAudio Member Join Date: Mar 2003 Location: Brussels	Looks as lovely as the city in which it was made... Were did you get the waveguide from?What is made of? Aluminium or something else? You don't often see those around here... Cheers Pajazo, Thomas

11th July 2005, 10:03 PM	#7
pajazo diyAudio Member Join Date: Sep 2004 Location: Helsinki/Finland	The waveguide is from hifitalo (www.hifitalo.fi). They use it in their kit aw-10hqi with an aluminum tweeter. It is made of plastic and it's about 22mm deep. The throat opening fits the 27tdfc perfectly. John Krutke has also made some measurements with the same tweeter but a different waveguide.

11th July 2005, 11:28 PM	#8
AJinFLA Banned Join Date: Feb 2005 Location: Tampa	Hi Pajazo, I'm going to have to wait to get home to see if I can download the finnish translator on my PC at home. My Finnish is not so strong (pun intended) . In the meanwhile, if you could e-mail them and let them know that there are raving lunatics desperate for such devices (me in particular) here in the USA, that would be greatly appreciated. I'd hate to have to buy an airline ticket to Finland just to get this thing . cheers, AJ

12th July 2005, 12:31 AM	#9
transducer diyAudio Member Join Date: Mar 2002 Location: Toronto, Canada	Ooh. I'd love a pair too, for my Seas 27TDFC. Ron

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