Fe138 mbvr 0v9 questions

serenechaos · 27th December 2008, 03:03 PM

I’ve started building a pair of these; have wood cut for what’s on the drawing in the 138 thread.
A few questions about recommended bracing:

1) Was enough room (volume) left inside to add a driver rear brace/holey brace?

2) and to add inside side panel braces, to divide in trapezoids?

3) Dimensions (depth) of the triangular shaped piece in back?

4) Length of the angled pieces (compression braces for sides) in the waveguides?

5) Angular position of the same; centered @ both the throat and mouth?

6) Supra baffle; is one needed? If so how big around?

Thanx!!!
r

planet10 · 27th December 2008, 04:36 PM

We need a name for this one.

Quote:

Originally posted by serenechaos
1) Was enough room (volume) left inside to add a driver rear brace/holey brace?
2) and to add inside side panel braces, to divide in trapezoids?

Yes, yes.

Quote:

3) Dimensions (depth) of the triangular shaped piece in back?

Not too large, minimum 34mm to the side.

Quote:

6) Supra baffle; is one needed? If so how big around?

Scott?

dave

serenechaos · 27th December 2008, 06:31 PM

Thanks!

4) Length of the angled pieces (compression braces for sides) in the waveguides?

5) Angular position of the same; centered @ both the throat and mouth? (bisecting the angle)?

planet10 · 28th December 2008, 12:03 AM

Quote:

Originally posted by serenechaos
Thanks!

4) Length of the angled pieces (compression braces for sides) in the waveguides?

5) Angular position of the same; centered @ both the throat and mouth? (bisecting the angle)?

Brace in the waveguide?

Optional. It needs to go with the flow. And it needs to be tight -- so tight that it pushes the sides out infetesimally.

dave

serenechaos · 28th December 2008, 12:33 AM

might it be better to use a couple or three large dowels?

(flow-wise)?
just an idea, some do it inside cabs...

planet10 · 28th December 2008, 12:37 AM

Quote:

Originally posted by serenechaos
might it be better to use a couple or three large dowels?

Dowels aren't as effective.

dave

serenechaos · 5th January 2009, 04:37 PM

Got one of 'em together...
Don't sound bad for something made out of scraps from two other projects

Actually, sounds like they have potential.

Kinda echoey though, need to figure out the internal damping thing.
Nothing inside now, just a big empty box, (with lots of bracing).
The new pdf sez "damp as you would a bass reflex cab."
Does that mean line the cab, stuff it part ways, or ???

I've built TLs & ML TLs, haven't messed w/ BRs before.
Same thing but different?
Deflex & wool?

27th December 2008, 03:03 PM	#1
serenechaos diyAudio Member Join Date: Feb 2004 Location: los alamos	Fe138 mbvr 0v9 questions I’ve started building a pair of these; have wood cut for what’s on the drawing in the 138 thread. A few questions about recommended bracing: 1) Was enough room (volume) left inside to add a driver rear brace/holey brace? 2) and to add inside side panel braces, to divide in trapezoids? 3) Dimensions (depth) of the triangular shaped piece in back? 4) Length of the angled pieces (compression braces for sides) in the waveguides? 5) Angular position of the same; centered @ both the throat and mouth? 6) Supra baffle; is one needed? If so how big around? Thanx!!! r

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27th December 2008, 06:31 PM	#3
serenechaos diyAudio Member Join Date: Feb 2004 Location: los alamos	Thanks! 4) Length of the angled pieces (compression braces for sides) in the waveguides? 5) Angular position of the same; centered @ both the throat and mouth? (bisecting the angle)?

28th December 2008, 12:33 AM	#5
serenechaos diyAudio Member Join Date: Feb 2004 Location: los alamos	might it be better to use a couple or three large dowels? (flow-wise)? just an idea, some do it inside cabs...

5th January 2009, 04:37 PM	#7
serenechaos diyAudio Member Join Date: Feb 2004 Location: los alamos	Got one of 'em together... Don't sound bad for something made out of scraps from two other projects Actually, sounds like they have potential. Kinda echoey though, need to figure out the internal damping thing. Nothing inside now, just a big empty box, (with lots of bracing). The new pdf sez "damp as you would a bass reflex cab." Does that mean line the cab, stuff it part ways, or ??? I've built TLs & ML TLs, haven't messed w/ BRs before. Same thing but different? Deflex & wool?

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