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Onken - will Altec 420A work???
Onken - will Altec 420A work???
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Old 10th September 2015, 08:24 AM   #1
atilsley is offline atilsley  Australia
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Default Onken - will Altec 420A work???

I'm interested to know if the 420A will work in the big Onken?

I understand the 420A is close to the 416

http://www.greatplainsaudio.com/vint...spec_sheet.pdf

T/S specs here -

Xmas inches 0.15
Re 4.6
Vd 19.2
Fs 22.6
Vas 28.2 cu ft
Ref 1.7
Qts 0.47
Qms 6.59
Qes 0.51
Vid 0.20

I'd appreciate any advice on this.....for example, is it best to stick with standard 416?

If going down the Onken path, I'll use the Gene Hiraga design...and use Azura 340Hz on top, crossed around 700Hz, using quality 2nd order xover and mosfet amp.

Andrew
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Old 10th September 2015, 10:29 AM   #2
S4m is offline S4m  Germany
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Don't know if this is a good recommendation but on this page: mh-audio.nl - Home you find a calculator for Onken enclosures. Maybe it will help you...
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Old 10th September 2015, 11:45 AM   #3
atilsley is offline atilsley  Australia
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Thanks S4m, I've seen that. Then, I saw on some other thread that to one should be careful about online calculators.
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Old 10th September 2015, 04:00 PM   #4
Inductor is offline Inductor  Portugal
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Did you measured the specs?
Original Fs from literature (Altec 419-8B, 420A Biflex Speakers) shows Fs being 27 Hz (15") and 39 Hz (12").
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Old 10th September 2015, 04:42 PM   #5
kevinkr is offline kevinkr  United States
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Onken - will Altec 420A work???
Qts is probably too high, for Onken really low qts drivers are de rigeur, probably under 0.25.. I have Iconic 165-8G in mine which is very very similar to a late 515-8G.

The Marc Cyr Debien/Jean Hiraga spreadsheet calculator is pretty reliable and what I used to design mine.
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Old 10th September 2015, 06:28 PM   #6
Pano is offline Pano  United States
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Onken - will Altec 420A work???
Well.... that is one way to find out.

If it does not, then you go get that pair of 416s.
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Old 10th September 2015, 10:13 PM   #7
atilsley is offline atilsley  Australia
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Thanks guys

I haven't measured the 420's yet...I collect them in two days.

I took the t/s data from here -

Altec Thiele-Small Parameters
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Old 11th September 2015, 02:48 AM   #8
Inductor is offline Inductor  Portugal
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Fanny, that was the same source of t/s data, same website.
Altec BIFLEX Loudspeakers
Only that maybe there is a difference in time (years?). One is the manufacturer data, maybe was measured in the factory and the other one maybe was measured after (database?, what drivers?). The Fs getting lower from breaking in, who knows?!
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Old 11th September 2015, 03:15 AM   #9
Inductor is offline Inductor  Portugal
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Andrew, why would you use the Altec 420A in a big Onken??
What's the size/volume net?
Well this driver (Altec 420A) has the same behavior (very close graph of output data in frequency) or is ideal for a sealed speaker, of large dimension ~300L, Qtc = 1.00. It needs very large enclosures and very low tuning, comparing with the Altec 416-8B, making it unsuitable for an Onken with same standard dimensions. It needs different volume and alignment.
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Old 11th September 2015, 05:12 AM   #10
atilsley is offline atilsley  Australia
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Quote:
Originally Posted by Inductor View Post
Andrew, why would you use the Altec 420A in a big Onken??
What's the size/volume net?
Well this driver (Altec 420A) has the same behavior (very close graph of output data in frequency) or is ideal for a sealed speaker, of large dimension ~300L, Qtc = 1.00. It needs very large enclosures and very low tuning, comparing with the Altec 416-8B, making it unsuitable for an Onken with same standard dimensions. It needs different volume and alignment.
Hi, I have (had) three reasons for thinking this.

1. I thought the 420A had similar specs to the 416 specs (I could be wrong, happy to admit error etc)

2. I love the Onken...and wanted to give it a go

3. I have access to some pristine 420A's within a moderate budget

The question is now a little academic, as I'll build a smaller ported box of 250 liters (8.5 cubic foot) first...then make a decision on the Onken/416 down the track.

With the various options for the 420A (from OB to sealed to ported), what would be your pic to get deep bass...?

Kind regards.
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