Hello,
This is my first post on this Altec forum.
I am about to build myself a pair of Altec 612 enclosures for my Altec 604 E?s.
I have found a blueprint of one of the Altec 612 models on net. The blueprint is attached with my markings on it.
My questions:
1. Will I need a bass tube for the bass port in the 612 enclosure ? - or will the opening be enough in itself.
The reason why I ask is because I found a picture of the inside of a vintage Barzilay cabinet that did have a bass tube.
2. I also did find a picture of a DIY 612 enclosure that had a frame on the inside of the cabinet that is not shown completely on the Altec 612 blueprint.
Will I need to build this frame ? - if I do can someone give me a hint of how it looks like from the top view.
3. I do not get what the purpose of the wood piece that goes across inside the whole enclosure on the blueprint - could someone please explain.
4. I did also find the original blue/grey color code - but it is not possible to mix - at least not where I live. Does someone out there have a updated color code for the original blue/grey paint ?
I will appreciate all the help I can get.
This cabinet is the 612C variant.
1) No you don't need a tube the port is 3/4" the thickness of the plywood.
2) That is a 3"x 3/4" wide brace that goes from the front to the back of the cabinet..I have posted some pictures of my 612C's on this forum somewhere I'll see if I can locate them.
3) That is also a brace on edge diagonally from top to bottom corner and it is reversed on the other side of cabinet.
4) Battleship gray should get you there,or pretty close.
Here's the original if you want to go with what the Beatles used [among many others], though you may want to experiment with some inserts of the smaller vent areas of later versions:
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
Why is the speaker hole beveled?
When dealing with full range drivers.It reduces the eigenmodes faster... (Courtesy of GM)Originally Posted by VolvoHeretic
Cabinets
Hi again people !
Thank you all so much for your help !
ALTEC BEST: Just found the dictionary definition on bevel: in simpler english:
you mean the angled cut on the edge of the hole for the speaker element- correct ?
GM: thanks! - will definitely use this as a sketch for the front part of the cabinet.
I have two more questions:
1. Can I use 19 mm MDF for this enclosure? - or is there other materials that you recommend?
2. How much filling should I use inside this enclosure - or should I just cover the walls inside of the cabinet with damping material (carpet) ?
Greetings from Norway.
Welcome Trlalalala!!! How funny I was just listening to a song with Trlalalala... Anyone no what it is??? What type of music do you listen to? What do you want out of your 604's? There are some more modern disigns that might work better for you... As far as materials I would use void free baltic birch easy to work with and sounds great!!!
You're welcome!
Any void free ~5/8" [15 mm_if going vintage] or ~3/4" [19 mm] plywood, Birch, Apple, marine grade.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
Just to make things more confused...
I once had an early 612 or 620 (forget which, been awhile) that had diagonally placed rigid fiberglass like the 618 photo below.
This stuff looks like Owens Corning 703 with a coat of varnish or lacquer to make it stiffer.
I'm wondering if that "brace" is there to hold a fiberglass or mineral board damping panel and not for cabinet reinforcement...or maybe it is the mineral wool panel itself!
The early cabs had very little internal damping material. In general, I have found that less is more with Altecs....add until the boom goes away. Too much and the liveliness is gone.
Check this 620 out
http://soundup.ru/images/stories/arc...ondition-7.jpg
Whereof we cannot speak, thereof we must remain silent --Wittgenstein
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