Posted by lon [ 209.103.198.45 ] on July 03, 2005 at 22:29:39:
In Reply to: Re: FE127E Design-- MLTL posted by jackmoai on July 03, 2005 at 05:24:17:
Hi again,
I got pretty close on all the measures but changed the port
substantially. There is a description and drawing of the
GM MLTL at the EJ Jordan Website. You could use the measures in
the link above for the FE127e.
Here's what I did: I got some 69 cent shelving which
I didn't have cut at all in the long length and the end panels
had to be trimmed to the right depth.
Having your own table saw helps with all this: I have
to ask someone occassionally to borrow some table time...
even that is real sketchy.
Cut the speaker hole with a 3 11/16 hole saw or a 4 in.
4 in is easier to find.
I chamfered out the back using a 3 dollar chamfer bit
mounted in a spin saw (spin saw is like a Rotozip).
The 6 in port I used is made from 2 in od pvc pipe
from the hardware/plumbing store and the hole is cut
with another hole saw of 2 in. diameter.
So far we have a box with speaker mounted on the
face, chanmfered back and _no stuffing_ with a couple holes
drilled in the back to let the speaker leads out.... and
a 6 inch white pvc tube sticking out the bottom.
What to do?
I tried making a custom stand from more of the
shelving stock but the easier solution was to take 2 of
those cheap 3 shelf plant stands that are found in any big box
store in their so-called furniture department. Well their so-called furniture is my _only_ furniture just about. I used the 2 in
hole saw to cut holes in the plant stands and pushed the
ports down through those. 
They're almost the right height at ear level but close
enough.
I made some grilles from some double knit fabric glued
onto some 1/4 in masonite. I managed to cut the centers out
with the spin saw, but this is not recommeneded.
Back to the original port design from GM: that can be put
on the front, on the back or out the bottom... it can be made
with a 1 in. hole saw and a couple layers of whatever comes up to the
1.125 (whateves) depth. I didn't like the sound from the
stubby ports... it was low but not _clear_ on plucked string bass.
So I lost a bit on the organ recitals I use to test builds.
However my main application is jazz shows and use with
the dvd-tv and streaming audio net news broadcasts.
If you aren't faint hearted when it comes to using EQ,
this design works well and will teach a lot about how much
can be done with a little.
Any questions, come back again.
The link below is another design that looks interesting for
an inexpensive driver in the Fostex line: a labyrinth tl
with mirror side ports.
I cannot find the MLTL Jordan design at the moment. In a
full speaker cab design, the longish port extends out the bottom
and the side panels can be full length to the floor. A 45d
baffle is used to focus the port energy out toward the
listener
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sort of like that in stick men terms: profile view.
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