Tang Band W4-1337SD

[aoc]

Hi guys,
This is my first posting here. I bought a pair of TB W4-1337SD during the holidays. I was inspired to build an spherical enclosure from article below

http://www.diyaudio.com/forums/multi...uild-done.html

Here is my version. I applied acousta stuffing inside. Initial sounds was nice but a little harsh, after 24hours running it has smooth out.

I paired it with a work in progress Jordan JX125NG woofer in an active crossover setup.

I'm trying to figure out if there is a better way to hold the sphere to a 2-3" copper pole. Any comments/ideas is welcome.

ps. i almost drop the sphere once and when i caught it i added wrinkles to the metal cone. Now I'm wondering if there is any sonic damage/change to the driver. I would have ordered a replacement if shipping was not as expensive to where i live, Penang Island, Malaysia.

[Red Spud]

That's pretty cool, I like it! Like a big eyeball.

You asked about holding it to a 2-3" copper pole. Do you mean 2-3" in diameter, or a smaller diameter, that is 2-3" long? If 2-3" diameter, I would think a glue like silicone would work. For a smaller diameter pole, I would think a mechanical connection would be needed, like drilling a hole into the sphere the diameter of the pole, and inserting it.

As for wrinkles in the driver cone, I'm no expert, but I think it would be bad. Does the wrinkled driver sound different from the good one? If not you're OK.

[Wolf]

The 1337 has a very fragile and thin cone. You shouldn't even touch it or it'll oxidize from the oils in your skin.

The reason it was harsh is there there are breakups to filter out in the drivers passband. I am thinking it's still harsh, but you've become accustomed to the sound. If you look in PE's Project Showcase, you'll find my '3CR-Ti'. I would try it with that filter and see what you think then. The bass response will be different, so it might require some minor tweaking.
Later,
Wolf

[aoc]

Wolf,
The reason I build a spherical box was to reduce if not eliminate the need for a bsc. But I like your suggestion to tame the ringing, could you give me more details on how you design that. Thanks!

[Wolf]

BSC is still important if they are not in-wall speakers. You will need some 2pi->4pi transition smoothing (BSC) as in any other shape, unless the design is up/down firing and omni-directional.

The filter was designed in LspCAD by Curt C. I was just learning PCD back then, and he offered it so I tried it. See my Blog on how to design contour networks or crossovers if you want to get your brains/hands dirty...

Later,
Wolf

[xavier]

A spherical enclosure is not going to reduce the need for bsc. It's just going to make the affected frequency response smoother. The only way to eliminate or reduce the need is to (respectively) mount the driver on an infinite baffle (wall) or mount the enclosure closer to a room boundary.

[aoc]

Thanks Wolf and Xavier for your inputs. I realized I neglected to mention that this speaker is use in an active setup with the crossover set at 160Hz and a Jordan JX125NG for the low end.