I'm building a pair of G Chang speakers. (http://homepage.mac.com/tlinespeakers/F ... 170608.pdf)
All parts have been ordered from parts express.
I'm using Pioneer B20FU20-51FW 8" Full Range Drivers and Dayton ND16FA-6 5/8" Neodymium Dome Tweeters
http://www.parts-express.com/pe/showdet ... er=290-045
http://www.parts-express.com/pe/showdet ... er=275-025
and a few capacitors for tweeter crossover.

Unfortunately some of the pictures of the construction are no longer available from photo bucket.
I bought some of the 'Sonic barrier' foam, and have some poly fill.
I have heard that it is recommended that dampening be placed directly behind the driver, top and one side.
Is this correct? what about the use of poly fill?

I'm using 1" MDF. I know its not the best material, but I already have it on have on hand.

Hi Tevis, that design looks great. 1" MDF is pretty heavy so given the size of the enclosure that will be a pretty heavy speaker.

A few capacitors .. were you thinking of some sort a switch or just to experiment with the right size?

That is a good place to start with the damping. You may even find that lining the 45s may help. You will likely want to adjust the amount and location of the damping after the drivers are broken in and to suit your room. Given the size of the driver you will have plenty of room to get your hands in there after the box is all sealed up to experiment with the damping. So you may want to use tee-nuts for the drivers as MDF is not great for holding screws after they have been removed a couple of times.

Cheers

use the caps on the + side of the tweeter.
I have 4 2uf and 2 1uf so I can do 2, 3, 4, or 5 uF for the cross for the tweeter, the 8" goes full range. With those caps I should be able to cross between 5k-10k.? Thats what I read anyway.

I'm going to use 'Great Stuff Window and Door" to fill the inside of the 45*

This is the exact same setup gychang used in this thread I found:
http://www.diyaudio.com/forums/full-ran ... riant.html
However mine will be made of MDF

Perhaps if the TangBand W8-1808 or 1772's sound great I'll build a set out of birch and use them as a quadraphonic surround.

I'm considering a different amp to power these, currently its a monster over kill 5 channel 120watt RMS per channel class A amp but it sure sounds good

Hi Tevis, I think you will find that you need to be in the order of about 1uF for the first order crossover on the tweeter. I can't imagine you will need to go over 2uF.
Cheers.

PS - I fixed the typo.