Altec 414A/416A/515B/406B Loudspeaker Spec Sheet
http://www.greatplainsaudio.com/vintage_altec/416A_LF_Speakers.pdf
Thiele/Small Parameters For Most Altec Speakers
http://www.greatplainsaudio.com/altec_thiele_small.html
Onken Calculator
http://www.diyaudio.com/forums/multi-way/189575-onken-calculator.html
http://www.greatplainsaudio.com/vintage_altec/416A_LF_Speakers.pdf
Thiele/Small Parameters For Most Altec Speakers
http://www.greatplainsaudio.com/altec_thiele_small.html
Onken Calculator
http://www.diyaudio.com/forums/multi-way/189575-onken-calculator.html
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You can measure.Thanks
I know these, in the T/S list 414 a is missing
Have searched without success. Need the specs for calculation of a small onken enclosure.
Originally, ~30 Hz Fs/0.3 Qts/14 ft^3 Vas, but I've seen re-cones with much different specs, so you really need to measure yours if planning to build such an elaborate, fixed port cab.
GM
You're welcome!
Based on some others GPA 15" re-cones, it wouldn't surprise me if they only use the later 'B'/'Z' series which has a much lower Vas [~125-160 L of mine and others OEM units] to fit two in the 9844 studio monitors, so no problem fitting them in 100 L tuned to around/at Fs.
Anyway, please post GPA's specs.
GM
Based on some others GPA 15" re-cones, it wouldn't surprise me if they only use the later 'B'/'Z' series which has a much lower Vas [~125-160 L of mine and others OEM units] to fit two in the 9844 studio monitors, so no problem fitting them in 100 L tuned to around/at Fs.
Anyway, please post GPA's specs.
GM
You can find nice pics on the theme in some Portuguese forums (no translation) here
Sistema ONKEN (Escuta)
and some Onken made in Portugal by a russian friend named Oleg Lesnikov (12" and 15").
AudioShow 2008
hi-fi.pt
Lesnikov Acoustics
Lesnikov Acoustics pic
Sistema ONKEN (Escuta)
and some Onken made in Portugal by a russian friend named Oleg Lesnikov (12" and 15").
AudioShow 2008
hi-fi.pt
Lesnikov Acoustics
Lesnikov Acoustics pic
Attachments
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THEY DON'T CARE WHEN THEIR MAIN INTEREST IS PROFIT. Some don't have labs anyway.Publishing T/S parameters is common practice.
It would be clever when GPA would do it also; seems to me a requirement in order to be taken 100% serious by the loudspeaker community.
According to GPA, the new production ferrite and AlNiCo 414s share the same T/S#s. Here's what they sent me:
RE 5.80 Ω (23◦ C)
FS 26.6 Hz
QTS 0.21
QMS 5.84
QES 0.21
SD 81.71 in.2 (0.053 m2)
XMAX 0.15 in. (4 mm)
VD 12.26 in.3 (0.2 l)
VAS 10.49 ft.3 (297.0 l)
ηo 2.52 %
I have a pair of the AlNiCo, but haven't yet had a chance to see how close mine match the published specs. I do have a box built, though...
Regards,
John
RE 5.80 Ω (23◦ C)
FS 26.6 Hz
QTS 0.21
QMS 5.84
QES 0.21
SD 81.71 in.2 (0.053 m2)
XMAX 0.15 in. (4 mm)
VD 12.26 in.3 (0.2 l)
VAS 10.49 ft.3 (297.0 l)
ηo 2.52 %
I have a pair of the AlNiCo, but haven't yet had a chance to see how close mine match the published specs. I do have a box built, though...
Regards,
John
THEY DON'T CARE WHEN THEIR MAIN INTEREST IS PROFIT. Some don't have labs anyway.
While I've been fairly outspoken on this subject, including against GPA, they do have the test gear required and the well qualified staff to use it, but apparently is a 'shoestring' operation plus their primary market seems to me to be Asian where folks in general don't seem to care much about such details same as we all once felt..........
GM
Just to say that (I) was not directing the critic to one manufacturer only (not Altec/GPA), look at PE that you can not find a pdf of output curves/documentation now. It's a problem of manufacturer/distributer/point of sale relation and no one wants to do the testing. Many diyAudio members also have that assertion that to much information available is BAD for the client. If you want something ASK! And this is when IT IS available. You loose your time and patience in the process.While I've been fairly outspoken on this subject...
Measuring the drivers was on my to-do list for the long holiday weekend, but since it's a timely topic I managed to get them done today. Here is the average for my pair:
Fs 32.385 Hz
Re 6.8 ohms[dc]
Le 308.76 uH
L2 999.405 uH
R2 19.09 ohms
Qt 0.315 -
Qes 0.325 -
Qms 7.82 -
Mms 30.765 grams
Rms 0.7996765 kg/s
Cms 0.000806 m/N
Vas 295.295 liters
Sd 510.71 cm^2
Bl 11.4663655 Tm
ETA 2.905 %
Lp(2.83V/1m) 97.44 dB
These were made with ARTA using the added-mass method. When measuring drivers on their back pointed up (so I can just lay four nickels on the cone), I find that both Fs and Qts tend to measure on the high side. And, these are fresh out-of-the-box -- no break-in. So, FWIW, YMMW, and all that... but GPA's published #s appear to be about right to me.
Regards,
John
Fs 32.385 Hz
Re 6.8 ohms[dc]
Le 308.76 uH
L2 999.405 uH
R2 19.09 ohms
Qt 0.315 -
Qes 0.325 -
Qms 7.82 -
Mms 30.765 grams
Rms 0.7996765 kg/s
Cms 0.000806 m/N
Vas 295.295 liters
Sd 510.71 cm^2
Bl 11.4663655 Tm
ETA 2.905 %
Lp(2.83V/1m) 97.44 dB
These were made with ARTA using the added-mass method. When measuring drivers on their back pointed up (so I can just lay four nickels on the cone), I find that both Fs and Qts tend to measure on the high side. And, these are fresh out-of-the-box -- no break-in. So, FWIW, YMMW, and all that... but GPA's published #s appear to be about right to me.
Regards,
John
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