Wednesday, November 4, 2015

New Folded Bass Horn - More Progress 6

Yesterday, I constructed a couple of corner reflectors for the New Folded Bass Horns.  Each reflector is intended to fit into the room corner and provide a reflective boundary that will change the direction of the sound radiating from the back of the main folded horn assembly and direct it out into the room through the matching pairs of horn flares on each side of the main assembly.  While the assembly is being modified with the addition of the corner reflector, the polyester fill is removed from the back chambers that were used with the original Sound Transformer bass horns and installed in the back chamber for the New Folded Corner Horn driver.

Here are some photos of the corner reflector being set up behind the folded horn assembly for the right channel.

New Folded Corner Bass Horn - Corner Reflector In Place
New Folded Corner Bass Horn - Corner Reflector In Place
Viewed from above, the shape of the twin side horn flares can be seen in the following photo:

New Folded Corner Bass Horn - Corner Reflector In Place
New Folded Corner Bass Horn - Corner Reflector In Place
With the corner reflector in place and the main folded horn unit repositioned to provide the proper dimensions for the side flares, the 4' x 4' plywood sheet is placed over the top of the horn.  As you can see, the plywood also happens to be a yard sale sign we have used several times.

New Folded Corner Bass Horn - 4' x 4' Top Panel In Place
New Folded Corner Bass Horn - 4' x 4' Top Panel In Place
Here is one of the back chambers from the Sound Transformer with KLH driver and polyester fill removed.  The back chamber will serve as a stand for the midrange horn, also from the Sound Transformer, currently being tested with the new folded bass horn.

New Folded Corner Bass Horn - Stand For Midrange And Poly Fill
New Folded Corner Bass Horn - Stand For Midrange And Poly Fill
The back chamber made from part of an old Technics speaker is now stuffed with the polyester fill.
The empty Sound Transformer back chamber is now the stand under the midrange horn.

New Folded Corner Bass Horn - Back Chamber With Poly Fill
New Folded Corner Bass Horn - Back Chamber With Poly Fill
The back chamber is now positioned at the correct height for the eight inch driver presently being used with the folded bass horn.  By the way, this eight inch speaker was removed from a Boston Acoustics Unity subwoofer cabinet.

New Folded Corner Bass Horn - Back Chamber And Eight Inch Driver
New Folded Corner Bass Horn - Back Chamber And Eight Inch Driver
Now the right channel has a corner reflector and polyester fill in the back chamber.  The stack of weights on the small square of plywood are intended to correct a little warping in the "Sale New And Used" cover panel.

New Folded Corner Bass Horn - Corner Reflector And Stuffed Back Chamber
New Folded Corner Bass Horn - Corner Reflector And Stuffed Back Chamber
The same changes have also been made to the left channel folded bass horn.  Now for more listening tests!




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