Re: project, 2 pair 412s with 931-12A horns.
Sorry, takes too long to explain it all [small book] and frankly, this type of post is mainly for me nowadays to refer to for answering one's design questions and anyone that can/wants to follow my 'train of thought'.
What's for you is that per my T/S assumptions, your + 10 % larger for vented is more like ~9.13x = 913% with tuning dropping ~ [54.27-36.83] = 0.6786 = ~67.86%, so bigger/longer than a + 10% vent.
As such, sealed is much more space friendly, especially since I just calculated for one driver, so for dual the vented cab doubles to ~568.4 L/20.073 ft^3 net.
Of course now that high SQ DSP is reasonably priced you could build it to your [or any in between] size and EQ it flat/whatever response works best in room. With such acoustically small cabs though, the vent can wind up being quite long if tuned low as the trade-off.
So.........where to from here?
GM
Re: project, 2 pair 412s with 931-12A horns.
Quote:
Originally Posted by
GM
So.........where to from here?
GM
I hear New Zealand is a nice this time of year. :)
Once I have a grasp of an overall formulas parts, I can usually predict the outcome with 2 or more variables.
I'm not counting on a huge amount of LF from the 412s below 50-60 hz. I have a couple of subs for that matter.
for now I'll start with a +10% mock-up and play with the port till I like it.
Re: project, 2 pair 412s with 931-12A horns.
Right, the pioneers often tuned to ~1.56x Fs with presumed 39 Hz = ~60 Hz tuning [Fb], so a reasonable choice/expectation. ;)
Looking forward to your final net volume [Vb], measured [free air rather than a manufacturer's baffled] Fs, [Fb] cab alignment results.
GM
Re: project, 2 pair 412s with 931-12A horns.
Quote:
So.........where to from here?
The universal enclosure... open baffle. :confused:
Re: project, 2 pair 412s with 931-12A horns.
Quote:
Originally Posted by
bowtie427ss
The universal enclosure... open baffle. :confused:
i suppose i could mount them in the ceiling. :D
Re: project, 2 pair 412s with 931-12A horns.
Ok so, i ended up with 4 414 16Es. Now i may as well go Carmel.
Does anyone know of a large home in a semi rural area for sale?
Re: project, 2 pair 412s with 931-12A horns.
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i ended up with 4 414 16Es
They have a really big motor(same ferrite as 416, 421, 921, 3127), they're more sensitive but they won't go nearly as low as an alnico 414.
It's really a slapped together driver, you won't find a sales slick, spec sheet, decal or label beyond a typed paper sticker or a "414-16" ink stamp on the magnet.
It does appear in the '83 pro catalog with precisely the same specs as the alnico versions. That is BS my friend. It would be replaced by the 3124 and 3127 in '84.
When somebody quizzed Bill and Steve at GPA about them a decade ago, they offered zero info. High Efficiency Speaker Asylum
Re: project, 2 pair 412s with 931-12A horns.
for some reason i kept thinking 16 E
but these are the ones i got.
Altec Lansing 414-16 12” Woofer | eBay
i found this post from a couple years ago. I guess what i have are 16 Bs
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Originally Posted by
bowtie427ss
AFAIK, all 414's used a cast frame. The early cast frames had curved spokes. 414z will be painted gold and have no magnet cover. 414A will be painted green with a can/cover over the motor.
>>414-16B/414-8B use the same motor in a newer style square spoked frame.<<
414-8C/16C use the one piece cast steel 416-8B type motor structure on the newer frame.
Quote:
Originally Posted by
bowtie427ss
these are the speakers i have.
Re: project, 2 pair 412s with 931-12A horns.
Re: project, 2 pair 412s with 931-12A horns.
Quote:
Originally Posted by
bowtie427ss
Yeah, I should have known better when I saw the alnico's.
Apparently the 414-16s I have came out of guitar amps according to the listing.
