The making of: The Two Towers (a 25 driver Full Range line array) - Page 62

Halair · 1st December 2014, 02:10 PM

Quote:

Originally Posted by wesayso

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

wesayso · 1st December 2014, 03:21 PM

I expect that as well...Should be plenty for now.
Second tower standing tall:

Done for the day... need to clean up before my family arrives.

Slothrop · 1st December 2014, 03:37 PM

Looking really good! How much longer till you can give them a listen?

wesayso · 1st December 2014, 03:38 PM

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.

barackuda · 1st December 2014, 05:15 PM

Wes...
looking really great!!!
Hope for a detailed review how they turn out sonicaly

Danny

wesayso · 04:52 PM

Rigged up a testing wire for impedance testing in REW.
Here's a few first results:

So what do you guys think...

(test enclosure, one speaker)

esgigt · 2nd December 2014, 04:33 PM

nothing a few passive components can't fix

Did you measure the DC resistance?

Greebster · 2nd December 2014, 04:53 PM

Fiberglass/angel hair looks best. Lets see distortion measurements.

wesayso · 05:29 PM

Very little difference between fiberglass and fiberglass/angel hair...

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:

wesayso · 4th December 2014, 10:25 PM

Another day of testing with various materials and placement of those materials.

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.

2nd December 2014, 04:26 PM	#616
wesayso diyAudio Member Join Date: Jul 2007	Rigged up a testing wire for impedance testing in REW. Here's a few first results: So what do you guys think... (test enclosure, one speaker) Last edited by wesayso; 2nd December 2014 at 04:52 PM.

2nd December 2014, 05:21 PM	#619
wesayso diyAudio Member Join Date: Jul 2007	Very little difference between fiberglass and fiberglass/angel hair... 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: Last edited by wesayso; 2nd December 2014 at 05:29 PM.

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1st December 2014, 03:21 PM	#612
wesayso diyAudio Member Join Date: Jul 2007	I expect that as well...Should be plenty for now. Second tower standing tall: Done for the day... need to clean up before my family arrives.

1st December 2014, 03:37 PM	#613
Slothrop diyAudio Member Join Date: Apr 2009 Location: northern Michigan	Looking really good! How much longer till you can give them a listen?

1st December 2014, 03:38 PM	#614
wesayso diyAudio Member Join Date: Jul 2007	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.

1st December 2014, 05:15 PM	#615
barackuda diyAudio Member Join Date: Oct 2006	Wes... looking really great!!! Hope for a detailed review how they turn out sonicaly Danny

2nd December 2014, 04:33 PM	#617
esgigt diyAudio Member Join Date: Dec 2013	nothing a few passive components can't fix Did you measure the DC resistance?

2nd December 2014, 04:53 PM	#618
Greebster diyAudio Member Join Date: Aug 2010 Location: South of the Skyway	Fiberglass/angel hair looks best. Lets see distortion measurements.

4th December 2014, 10:25 PM	#620
wesayso diyAudio Member Join Date: Jul 2007	Another day of testing with various materials and placement of those materials. 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.