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The making of: The Two Towers (a 25 driver Full Range line array)
The making of: The Two Towers (a 25 driver Full Range line array)
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Old 1st December 2014, 02:10 PM   #611
Halair is offline Halair  Norway
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Quote:
Originally Posted by wesayso View Post
It's a Pioneer A757 Mark II. 20 Kg of old-fashioned power. But it rates at ~ 100 watts RMS at 8 ohm. I sure do hope that's enough. Bought this amp new all those years ago and would hate to let it go.
I have a 125W 8ohm amp on mine so I'm certain you'll have fun with 100W
I'm going for 25W Class A for mine, another DIY project
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Old 1st December 2014, 03:21 PM   #612
wesayso is online now wesayso  Netherlands
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I expect that as well...Should be plenty for now.
Second tower standing tall:
Click the image to open in full size.
Done for the day... need to clean up before my family arrives.
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Old 1st December 2014, 03:37 PM   #613
Slothrop is offline Slothrop  United States
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Looking really good! How much longer till you can give them a listen?
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Old 1st December 2014, 03:38 PM   #614
wesayso is online now wesayso  Netherlands
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That depends on how crazy I get with the rest of my plans
Still some things to do but hope to get there within 3 weeks.
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Old 1st December 2014, 05:15 PM   #615
barackuda is offline barackuda  Slovakia
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Wes...
looking really great!!!
Hope for a detailed review how they turn out sonicaly

Danny
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Old 2nd December 2014, 04:26 PM   #616
wesayso is online now wesayso  Netherlands
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Rigged up a testing wire for impedance testing in REW.
Here's a few first results:
Click the image to open in full size.
So what do you guys think...

(test enclosure, one speaker)
Click the image to open in full size.

Last edited by wesayso; 2nd December 2014 at 04:52 PM.
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Old 2nd December 2014, 04:33 PM   #617
esgigt is offline esgigt  Netherlands
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nothing a few passive components can't fix

Did you measure the DC resistance?
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Old 2nd December 2014, 04:53 PM   #618
Greebster is offline Greebster  United States
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Fiberglass/angel hair looks best. Lets see distortion measurements.
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Old 2nd December 2014, 05:21 PM   #619
wesayso is online now wesayso  Netherlands
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Very little difference between fiberglass and fiberglass/angel hair...
Click the image to open in full size.

The wool felt was only used on the vertical walls, I want to try that with fiberglass with all walls covered with wool felt. I ran out of time to be able to seriously test more combinations. The wiggle at 400 seemed lowest on the fiberglass/wool felt combo.
Compared to the speaker on baffle without box:
Click the image to open in full size.

Last edited by wesayso; 2nd December 2014 at 05:29 PM.
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Old 4th December 2014, 10:25 PM   #620
wesayso is online now wesayso  Netherlands
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Another day of testing with various materials and placement of those materials.
Click the image to open in full size.
Fiberglass stuffing enclosed in wool felt gave the smoothest curve (again).
Very small trace left of the wiggle just before 400 Hz. It is in the empty chamber plot but not on the baffle alone.
Can't find a sweet spot to remove it entirely yet.
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