what is the best way to avoid box coloration ?

[lduarte1973]

what is the best way to avoid box coloration ?

[marce]

No Box, sometimes refered to as OB

[simon dart]

"box coloration" is often used as a term that covers all sorts of things:

Vibration of the box panels from driver reaction forces and back wave pressure,

The internal resonances of the box being audible through the driver cone,

Modification of the driver response due to box diffraction,

...to name some of the major culprits all can be lumped as boxiness.

The inconvenient truth is that everything matters! There's lots to understand here including the fact that there is no simple answer. The ear/brain is very sensitive to different patterns of resonances too. Even OBs can sound quite coloured if you get bad edge diffraction.

[kevinahcc20]

Eliminate the box (dipole)!

[FullRangeMan]

A OpenBaffle or Dipole is a great way of get rid of box colorations and get more music flowing to front and rear sides.
A good suggestion are the usual Visaton B200 and the Eminence Alpha15A, the crossover is just a 4,7mH inductor at 290Hz.
Seems to me, there is some threads about this project on this Forum and abroad.

[SirByrd]

Brace the cabinet until is behaves like a solid piece rather than a bunch of panels, then make sure you get internal damping "just right"

[planet10]

One of the boxiest speakers i ever heard was an OB.

Here is one approach to making boxes with a low box signature
Discussion on what materials to build speakers out of

(a long read)

dave

[marce]

Interesting...
One of the least boxy sounding speakers I have had have been the curvy changs.
I think maybe it may be useful to determine the irritating things boxes add to the sound.
My pet hate are some bass reflex designs, the chuffing out of the port I find very irritating.

[Conrad Hoffman]

Don't build "monkey coffins". Angle sides, use braces and use multi-layer construction. Try not to create multiple resonances at similar frequencies. I've never heard one, but remember the sand filled walls of some speaker from the 1950s or 60s? Be careful of port sizes so you don't get port noises. Get damping just right!

[ODougbo]

Angles, yes of course, small front/baffle board also; stands are important.

Pic ~ I made about 20 of these, using Peerless 1591, morel tweeter and a simple 6 db crossover. They sound great, bass is awesome. Not only are the sides angled the walls are lined with lead. If they look a bit old, you’re right, about 20+ years, still sound great!

The 5 ¼” Peerless woofer was ideal, wow what a lot of bass; too bad they discontinued them long time ago.

*Back then, we used to pull the dust covers and insert foam plug(s), “opens” them up quite a bit.