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Old 23rd October 2012, 02:43 AM   #71
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Quote:
unless driven with a high output impedance or at high average power, I doubt you can hear a difference between AlNiCo and ceramic:

GM
Care to explain how high Zo changes things. Amps are not a problem, if there is justification for a certain type.
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Old 23rd October 2012, 02:47 AM   #72
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Originally Posted by buzzforb View Post
Big Cal has suggested that the 421 is his favorite Altec for mids. I think that they can be reconed as a 416, but cant quite get my head around the change.
I’ve kept a ~NIB pair of 1st edition 421-8H for just this reason, but these go non-linear like right now, so strictly for low power [~50 W] in HIFI/HT apps, though can still do near THX, etc. LFE reference down to 80 Hz, so still plenty loud.

There’s been some threads on this subject on the Altec and probably on the Lansing and Audiokarma forums also.

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Old 23rd October 2012, 11:31 AM   #73
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The 416 in a QW-1 enclosure would give good response well below 40Hz
and transientresponse will be a clear improvement over an ordinary vented cab.
Tall and handsome too instead of the formerly critisised short and fat Onken style box.
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Old 23rd October 2012, 12:22 PM   #74
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IS this a specific enclosure or a general quarter-wave alignment?
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Old 23rd October 2012, 12:36 PM   #75
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It´s specific, this one actually.

Click the image to open in full size.

Click the image to open in full size.

Built by quite a lot of DIY friends all over the globe.
Used with all kind of drivers from todays top Pro manufacturers to
various classic units.

Actually produced commersially too.
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Old 23rd October 2012, 01:37 PM   #76
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Considering that it will be a customm build, I think I will try to go with a design specific to this woofer. GM designed an MLTL for it in another thread and that's where the idea came from. I like the idea of as big a box as I can get away with. As long as I can keep the proportions acceptable, I can get away with a big box. Got a small 6 cubic feet job in the house right now that the wife doesn even flinch at.
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Old 23rd October 2012, 03:42 PM   #77
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I like that one from Ingvar ; same breed as mine from The Pass Pub: The High-End Off Topic Thread

am I dumber than usual , or I didn't saw that one from GM ?

I'm probably just dumber , so I can't remember where it is
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Old 23rd October 2012, 03:43 PM   #78
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Altec 416b MLTL, design by GM

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Old 23rd October 2012, 04:10 PM   #79
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tnx

buzz of !

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Old 23rd October 2012, 06:30 PM   #80
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Withot being able to see the inside of the cabinet, this desing sorta resembles the Pensil's by Scottmoose. He call them a resonant air coupler. I would expect a horn like path inside, but there is noting of the sort. What turns it int the a TL, the port? Everything I have read about TL's is that they have to do with quarter wavelength, which increases the lower you wish to tune. A TQWT can shorten this path by using a narowing line. Is this what the squaer port is doing?
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