Altec 816

[hoktuna]

I`m planing to build some 816 boxes.Now i playing onken 360 L and homebrew 1005 multicell on top Beyma cp16.
http://audioheritage.org/vbulletin/showthread.php?t=17258&highlight=onken+multicell
The onken box is too high if i place the multicell ontop of it.
The 816 is a nice looking box and the plan is to build 4 or 6 of them.
Drivers i have is 4 pice of 416 8A and 2 D140 R.
What do you guy`s think?

[Goodwill_HiFi]

I can't comment much on your plans, but I like the 816VI cabinet that is part of my 9864A Engine. Since I can't find another 9864A, I plan on using separate HF and LF drivers and horns with 816 cabinets. I'd like a pair of the 816VI, but have a line on the standard 816's.

[hoktuna]

Is there a ral number for "theater grey"paint.

[Goodwill_HiFi]

Is there a ral number for "theater grey"paint.

I don't know what a "ral number" is, but if it's some sort of code for mixing the paint...... I don't think so.

[hoktuna]

I have play the proto boxes for a week and sound is "honking":(
http://i194.photobucket.com/albums/z134/hoktuna/DSC_0088.jpg

[hoktuna]

http://i194.photobucket.com/albums/z134/hoktuna/DSC08224.jpg
http://i194.photobucket.com/albums/z134/hoktuna/DSC08226.jpg

[Goodwill_HiFi]

They look pretty good. Did you use particle board?

What do you mean by honking? I've heard people mention it in reference to the 811b and 511b high frequency horns.......... not about bass/mid-bass horns, Though.

[thansaffel]

hoktuna,

I have a pair of 816a enclosures that I got for $25 the pair at atlas audio repair in Pittsburgh PA. They were happy to get them out of the shop, and I can relate. My understanding about these cabs is that they are meant to be massed for sound reinforcement - the LF cutoff for horn loading is at 300Hz, after which they default to bass reflex boxes. They are known to sound somewhat boxy according to Steve Schell on another set of posts on this forum. That was my finding too - there were some boomy frequencies I just could not get rid of even with bracing and agressive EQ.

They are now in my barn and I am using the JELabs open baffle for my 416As. I doubt I will use them again except for outdoor parties where I need a big box that protects the woofers well (and I won't be using the 416s outdoors!)

I have thought about the 360L Onken, which was designed for the 416A, and also about the 620 enclosure and the 612, all of which are also BR boxes but with a much higher volume (size that is) and so perhaps less of the boxiness, especially with the thick felt padding that the Onken specifies.

Ultimately I have kind of given up on perfect, unboxy bass from the 416A family. They are amazing drivers - they barely move at 100dB! - but there is a certain "hardness" in the upper midbass on a lot of material - so much, in fact, that I think a certain amount of midbass forwardness is just part of the driver's DNA, and the OB seems to mitigate it better than any configuration I've tried (including the Altec Valencia ported box, which is very close in volume to a 612).

Good luck !

Than

[hoktuna]

I have tried too damping the box and whith less damping it sounds "horn"
Now it sounds wery well when box is nearly filld whith damping

[r.kettenis]

I've got two altec 816's who i combine with two Tannoy Puma dualconcentrics. Since last week I have those Puma's.

In the 816's are altec 3156 250W speakers and in the tannoy's are the 300W gold speakers.

Now i'm combining them together. Searching for the best setup.
I've got two active yamaha F1030 crossovers and two yamaha p2200 amps.

About the 816's. It makes sense in what kind of room you put them. A time ago I had them in a Café where there was NO low on the front but in the back of the café and on the rear of the PA there was mutch low. Last year I had them outside and that was great. Great dance-able sound. I think its just were you put them in the envoirment.

Before the 3156 speakers in the 816's I had 421-8LF speakers in them. That sounds great to but with 150 watt it was not enough for disco use and sometimes A little band. The 3156 can handle mutch more power.

http://www.mijnalbum.nl/Foto-4JVCIBW8.jpg

[hoktuna]

A friend came over and helped me measure the 816 and mutis`.
Pics of result in this tread..
http://www.hififorum.nu/forum/topic.asp?TOPIC_ID=74565&whichpage=2
After that som new filters came upp.
Xover point is 816 350hz multicell 3khz beyma cp16
The sound is just wonderful :)
The highpass filter of the multis`is a big improvment.
And a network for 500hz peak in the 816.

[hoktuna]

LF net is 3,9 mh 55uf,net for the 500hz peak is 10uf 10mh(hand wound with 0,8mm wire for 5,8dcr)
MF net is 0,5 mh 33uf 3,3mh 4,7uf 3,3R serie 12R paralell.
HF net is 3,7uf.

I want to try c-c net but not shure how to do..
For high 2x8uf ,9v with 2m ohm betwen the c`s?
For mid 2x66uf ,9V whith 2m ohm betwen the c`s?