Seas 27tdfc + waveguide and Peerless 830870 project - diyAudio
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Old 11th July 2005, 08:10 PM   #1
pajazo is offline pajazo  Finland
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Default Seas 27tdfc + waveguide and Peerless 830870 project

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.
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File Type: jpg seas_27tdfc_waveguide_fr.jpg (57.8 KB, 1469 views)
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Old 11th July 2005, 08:11 PM   #2
pajazo is offline pajazo  Finland
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The crossove schematic
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File Type: jpg jakosuodin.jpg (18.4 KB, 1320 views)
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Old 11th July 2005, 08:12 PM   #3
pajazo is offline pajazo  Finland
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Final on axis frequency response
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Old 11th July 2005, 08:15 PM   #4
pajazo is offline pajazo  Finland
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Picture of the loudspeaker, the crossover is still sitting on top of the enclosure.
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Old 11th July 2005, 08:22 PM   #5
pajazo is offline pajazo  Finland
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This is the simulated frequency also showing the simulated reverse null. (I haven't yet actually measured it with the tweeter reversed).
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Old 11th July 2005, 08:57 PM   #6
C37 is offline C37  Belgium
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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
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Old 11th July 2005, 09:03 PM   #7
pajazo is offline pajazo  Finland
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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.
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Old 11th July 2005, 10:28 PM   #8
AJinFLA is offline AJinFLA  United States
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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
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Old 11th July 2005, 11:31 PM   #9
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Ooh. I'd love a pair too, for my Seas 27TDFC.

Ron
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Old 12th July 2005, 04:18 AM   #10
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