New enclosure for M 19 components??

Hi there!
It seems to me it's time to start my new Altec project. For now I have two 811 horns and two 806A 16 omhs drivers. I don't have too much space in my room (it was the reason why I sold my Onken cabinets with 416A+511+808) and I need something like Stonehenge V enclosures, but for 811 horns and 15' LF speaker . Anyone can tell me if such design of the cabinet exist? I will need LF loudspeaker and I think 416-8C from GPA is a good choice? Btw, what is today's price of 416-8C? Thank you in advice for any possible help.
Mike

Yes - The SH V enclosure can be easily adapted for Model 19 components. Since it's the same internal volume, the performance should be identical, perhaps better.

And see if you can get Bill to make you some ALNICO 416's! If not, the C's will do nicely.

This thread is about an 811/416 loaded MLTL designed to be no wider than necessary to accommodate the M-19's horn/woofer offset. Anyway, contact him for any additional details and the now missing link to the rest of the pics: http://www.hostboard.com/forums/altec-users-board/125594-altec-project-done-thanks-gm.html#post1281213

http://img101.imagevenue.com/img.php...57_dan_si.jpeg

GM

Hi Todd and GM!
Thanks a lot for your reply and good ideas. Now I'm thinking what to do :) Stonehenge V is 9 cuft, but GM's cabinet is 10 cuft. SH V dimensions looks better to fit my room. On the other hand, GM's cabinet looks more closer to M 19 (just reversed W an D). What do you think if I'll use SH V dimensions and will put 811 horn inside the cabinet (on the top) and will make enclosure bit deeper (say, 22")? It will give me 11 cuft to compensate volume of the 811 horn.
Btw, I have a deal with Bill from GPA - I gonna bay two 416-16C speakers.

regards, Mike

GM, could you post a brief description of the way the transmission line is loaded? If there is a thread to this build, I haven't discovered it. I would like to build a taller M-19 enclosure, as well.

Quote:

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Originally Posted by mikebond

Hi Todd and GM!
What do you think if I'll use SH V dimensions and will put 811 horn inside the cabinet (on the top) and will make enclosure bit deeper (say, 22")? It will give me 11 cuft to compensate volume of the 811 horn.

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Greets!

You're welcome!

Yes, you can do that, though you may need to fine tune the vent depending on what the net Vb turns out to be, whether you put it up near the driver or down at the bottom and how the room's acoustics affects the speaker's response. Some fine tuning of the horn may be required also.

GM

Quote:

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Originally Posted by westend9

GM, could you post a brief description of the way the transmission line is loaded? If there is a thread to this build, I haven't discovered it. I would like to build a taller M-19 enclosure, as well.

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There are numerous threads on the DIYaudio boards about MLTLs, ML-horns and ML-TQWTs and a complete, mind numbing amount of in-depth info is available here: http://www.quarter-wave.com/

I linked to one example posted here, so not sure what you're looking for.

The short of it is that once the cab's length gets long enough to have 1/4 WL harmonics, they load (damp) the vent, making it more efficient which in turn allows it to either be shorter for a given area or a larger area for a given length. This results in better driver damping.

Anyway, the sky's the limit, so to speak, so what dims did you have in mind?

GM

Thanks, GM, that cleared up a lot for me. I've tried to digest most of MK's site, used it for speaker builds in the past. I don't use the Mathcad part of the information there as I only build the occasional enclosure.
My interest in a new Model 19 enclosure lies partly on the coondition of the cabs I presently have and listening space considerations. My present enclosures are a pair of DIY Model 19 clones. Although built to exact dimensions and sturdy, their outward appearance is less than desirable (tan Formica for the baffle). I would also like to raise the position of the woofer to get a better listening angle.
The enclosures that were linked to above have most of the requisite dimensions and woofer placement I'll need. I might change the depth in favor of width if that would be allowable. Also, if there is a way to raise the woofer even a bit higher but retain the MLTL characteristics, that might be the way for me to proceed. Perhaps a raised base would aid in that.
Thanks, again, for the original work done on the dimensions.

You're welcome!

Baffle width generally is only an issue if well away from any boundaries and usually can be tonally adjusted by careful balancing of the horn's output, so in this situation wider is better until at around 36" it becomes moot except in a truly large floor space.

Large cabs in general and MLTLs in particular have a high degree of tuning flexibility, so again, list the o.d. dims you want WRT the cab's H/W/D, center-line of woofer and horn to floor height and whether or not the horn will be in a separate cab, desired Fb (F6) and ideally where in the room they will be and how big/open a room it is.

GM

I plan to make a separate enclosure for the horn as I might change that in the future. At this point I find nothing objectionable to the 811 w/802 driver. If possible I would like the centerline of the woofer to be + 36" from the floor. In fact, +44" would be the most advantageous. The room these will be positoned in is 12' wide and 36' long. Speakers positioned on the short wall. Ceiling height is 9' but a vault is directly over the speakers. That vault height is 14'. I have no requirements as to the dimensions of the enclosure. My main focus is to build an enclosure that will afford the raising of the woofer.
In addition, I have other drivers like AMT1 tweeters and subwoofers that could augment any frequencies, if needed. I am currently biamping the model 19 components and see no reason to change to a passive crossover.