My Woofer Cabinet: Altec TAD JBL

[HP8903B]

I've recently built a pair 16" woofer cabinets.
I would like to get your impressions.
Please feel free to comment including suggestions, criticism, and etc.

Specifications:

Dimensions: 24W x 26H x 26.75D inch
Volume: ~180 Liter (6.35 cubic feet)
Material: 3/4" baltic birch plywood, 3 layers on the baffle, 2 layers for the other 5 sides. These 5 sides are braced together with 2.75" square wood.
The woofer mounting plate is 1/2" thick alumninum CNC to spec.
Tuning frequency is 39Hz.
The footers are 3" diameter x 3" tall made of copper (Mapleshade design)
Top, back, and one side are lined with natural cotton mat.
All glue, no screws, rabbet joint.
All sides are closed off.

I am aware that the square box is not good. Due to width, height, and volume requirements, I have no choice. I think it's is still ok with the damping material.

[HP8903B]

Since when I took the pictures, I've rubbed oil on the cabinets and put African ebony blocks underneath the footers.

[JRKO]

Nice - you can never overdo a sub

What are they for? HT/normal listening
What are they driven by?
How big is your room? - thats a LOT of sub

BTW If you lived in the UK and posted pics of those feet you'd be burgled tonight for the scrap value!!

[HP8903B]

They are part of a 4-way speaker system for stereo only.
I am not sure what to drive the woofers with yet. I am thinking 15-25 watts SET amp
These cabinets for woofer, not sub-woofer. The woofer will be for ~240Hz and below.

BTW If you lived in the UK and posted pics of those feet you'd be burgled tonight for the scrap value!!

Haha, I hope not.

[ra7]

Looks very professional!

I recently built a very similar box. But me being me, I didn't wait to put bracing in there, nor did I wait to put feet, just mounted the woofer and went with it. Thankfully, I've left the back open for future adjustment, so all is not lost yet.

Its hard to get the dimensions right if you are planning to mount a big horn on top. Inevitably, it comes out as a cube.

Are you planning to add subs? coz I don't see a vent.

[HP8903B]

Looks very professional!

Thank you.
A lot of hard work went into these cabinet.

I would like to see pictures of yours.

There is a port in the back of the cabinet.

[HP8903B]

Each cabinet, without footers, weighs 140 pounds.

[JRKO]

Well I've got to say you're committed!!!

I love the idea of multiple valve amps driving a multiway system.

Whats going on top? Gotta be horns of some sort right? Is that what you mean in the thread title - Altec, Tad JBL

I think the double/triple thickness carcass and the Alu plate (great idea BTW) are going to make for a real dead foundation. You're gonna have to play something honkin' deep 'n' loud to get any vibration I think

[HP8903B]

Whats going on top? Gotta be horns of some sort right? Is that what you mean in the thread title - Altec, Tad JBL

yes

I have never seen any speaker with similar mounting method.
I have only seen t-nuts in the wood or something along that line.
I think the aluminum plate will really grips the woofer and makes the woofer's frame/basket become part of the cabinet. I think it also strengthens the baffle around the woofer area.

[JRKO]

Originally Posted by manp111

I think the aluminum plate will really grips the woofer and makes the woofer's frame/basket become part of the cabinet

I was toying with the idea of mounting the driver securely by using threaded bar (instead of bolts/screws) from the front through to the back wall of the cabinet with a metal plate on the outside and something like butterfly nuts to tighten....