What to do with Altec 515b and 288-8g on 805b horns

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Originally Posted by Panomaniac

Hey Earl. All the info you need is in the link I posted above.
Onken 360l Enclosure with Altec 416 drivers
Check out the linked articles at the bottom of the page. Plans are within those links.
Onken Plans

There is a google translation button on the French pages. It does a decent job. Since I was around when those boxes where built and the articles written, I can help if there is something you don't understand.

This box is meant for the 416, but the 514 should be OK in it. Maybe a little less bass, but better dynamics. And you can always swap in a pair of 416s later, if you find a pair or trade your 515s for them. This is a great bass box, despite its odd design. It has won fans the world over.

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Interesting.

I didn't mention it here because this is the "Altec" place, but over at the "other place" this was in my very first post to the OP:

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If i had these drivers, i'd look for something that has better LF performance than 825/828, maybe an Onken or something similar.

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:D

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Originally Posted by Panomaniac

Hey Earl. All the info you need is in the link I posted above.
Onken 360l Enclosure with Altec 416 drivers
Check out the linked articles at the bottom of the page. Plans are within those links.
Onken Plans

There is a google translation button on the French pages. It does a decent job. Since I was around when those boxes where built and the articles written, I can help if there is something you don't understand.

This box is meant for the 416, but the 514 should be OK in it. Maybe a little less bass, but better dynamics. And you can always swap in a pair of 416s later, if you find a pair or trade your 515s for them. This is a great bass box, despite its odd design. It has won fans the world over.

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Panomaniac,

Thanks. Got it. Sorry never bothered clicking the bottom part in french. Turns out thats where the plans are. Thanks for pointing it out. Will study it. Looks like a simple cabinet to build which just needs decent finishing to make it look beautiful.

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Originally Posted by bowtie427ss

If i had these drivers, i'd look for something that has better LF performance than 825/828, maybe an Onken or something similar.

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See, damaged minds think alike! ;)

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Originally Posted by eestrera

Looks like a simple cabinet to build which just needs decent finishing to make it look beautiful.

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It's not too hard. A lot of work, a lot of parts, but not hard. I'd like to build a pair out of bamboo plywood. That would be killer. Easy to finish and looks great. Even smells good. The end grain is very pretty, too, so no need to hide it. But $$$.

If you do one, put the damping in a curtain about 1/3 of they way back. Works better than on the back wall. Front or back panel removable, does not matter. Just depends on if you like to see the screws or not.

What about an Onken W box. I like dual woof's with any Large format driver.

TWOGOODEARS - ??????????: ... again about Goto speakers from Japan: visiting my friend Toni and listening to his system

Well I just so happen to know the Onken W box very well indeed. It's amazing, truly amazing. But it's huge and very, very heavy. Double walled, sand filled construction. Even I am not that dedicated. But man, is it ever clean.

You'll end up spending a lot of money on an amp to run the Onken-W. Why? Because you can hear every little flaw in your bass amp. It has to be top notch or you will always be bothered by some little "something."

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Originally Posted by Panomaniac

See, damaged minds think alike! ;)



It's not too hard. A lot of work, a lot of parts, but not hard. I'd like to build a pair out of bamboo plywood. That would be killer. Easy to finish and looks great. Even smells good. The end grain is very pretty, too, so no need to hide it. But $$$.

If you do one, put the damping in a curtain about 1/3 of they way back. Works better than on the back wall. Front or back panel removable, does not matter. Just depends on if you like to see the screws or not.

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I was also thinking of bamboo plywood/plyboo because aside from aesthetics, I've always felt like bamboo was musical and had good acoustic properties. It claims to be harder than oak while still retaining some amount of flexibility. Too bad there non are available here in our area and the closest on to import is from China. What is available though are laminated bamboo panels, crushed bamboo or strips laminated into a piece of plywood as a veneer. Looks pretty good to.

For inside cabinet damping, has anyone tried dynamat? The one they used in the car doors for car audio?

Thanks,

Earl

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I was also thinking of bamboo plywood/plyboo because aside from aesthetics, I've always felt like bamboo was musical and had good acoustic properties. It claims to be harder than oak while still retaining some amount of flexibility. Too bad there non are available here in our area and the closest on to import is from China. What is available though are laminated bamboo panels, crushed bamboo or strips laminated into a piece of plywood as a veneer. Looks pretty good to.

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In most cases an acoustically "live" material is the last thing you want to construct loudspeaker cabinets from.

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For inside cabinet damping, has anyone tried dynamat? The one they used in the car doors for car audio?

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Probably cost prohibitive for the quantities needed in a large wooden box, at the very least i expect the cost well exceeds the point of diminishing returns. I'm a big fan of well secured fiberglass, there's probably more than one reason it's been the standard for decades for most manufacturers.

Now, Dynamat for damping the small format horns OTOH, i think it's the perfect material for this job, just don't apply it to anything you might ever want to remove it from.

Just my .02...................

Bamboo ply isn't all that live. No worse than birch, as far as I could tell. Much denser. And what colorations it has are not unpleasant. No real research here, just my experience.

100% Wool felt is the way to go. But it is expensive and sometimes hard to get. There is a nice new cotton insulation on the market that I've heard in action and was quite impressed with. Bonded Logic makes it in the USA.

But yeah, I use fiberglass. =) Cheap and easy to find.

Hi Guys,

I am almost complete with my A7 cabs and I understand that the best this cab will do is 50 cycles or so?

My thoughts on this have lead me to consider 'retuning' the bass chamber after all the removeable board(s) on the front lend themselves to experimentation on box tuning.

My reasoning is that the A7/A5 bass bin is great as it has the midhorn and time aligns the woofer to the horn compression driver - well worth keeping?

The mid horn will bring the efficiency of the woofer up a tad to better match the comp driver and thus allow less attenuation on the comp driver?

Now given that I am new to Altec VOTs I am sure that someone else has considered this and even implemented?

Earl, I believe the A7/A5 is worth looking at for these factors, but I am no Altec Guru - keen to hear what others think

Winders

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Originally Posted by Panomaniac

There is a nice new cotton insulation on the market that I've heard in action and was quite impressed with. Bonded Logic makes it in the USA.

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That's the stuff that I've wanted to try for awhile.