Thanks dave,please can you suggest a solution?🤗
Keep in mind that is a graph without crossover connection.
Last photo is with crossover in place
Keep in mind that is a graph without crossover connection.
Last photo is with crossover in place
Last edited by a moderator:
It depends on the frequency; for mid range and up, stuffing can dampen the sound wave from the rear of the cone, helping absorb reflections, for bass it is unlikely that there will be enough length in the enclosure for a wave to be reflected, so the effect of stuffing is to make the enclosure behave like it's larger by changing the compression/ expansion from adiabatic to more isothermal.
On my latest speakers I've used a folded tapering wedge shape for the full range (400hz up) to absorb reflections, and a heavily stuffed (with cotton wool) enclosure for the bass. On my next speakers I'm planing on gluing felt to the inside, then carpet tile to that, hoping that it will mechanicaly dampen the walls, reduce internal reflections and stop sound from passing through from the inside to the outside.
On my latest speakers I've used a folded tapering wedge shape for the full range (400hz up) to absorb reflections, and a heavily stuffed (with cotton wool) enclosure for the bass. On my next speakers I'm planing on gluing felt to the inside, then carpet tile to that, hoping that it will mechanicaly dampen the walls, reduce internal reflections and stop sound from passing through from the inside to the outside.
That seems to have sorted it, but the higher frequencies that are ringing above teh XO may still be audiable.
IIRC you have a paper cone woofer?
dave
IIRC you have a paper cone woofer?
dave
A treatment with a (slightly) thinned coat of modModeg (or simialr puzzlekoat) will damp out or reduce the ripples, as well as helping with DDR — resolution+ — by sealing down the paper fibres and reducing cone self-noise.
https://www.t-linespeakers.org/design/tweeks.html
also gives an opportunity to “colour” the cone.
dave
https://www.t-linespeakers.org/design/tweeks.html
also gives an opportunity to “colour” the cone.
dave
Usually you do some listening tests.
For a reflex box middle size:
Take egg crate foam 4-5cm thick fixed with glue on all internal surfaces.
Against a standing wave you can put (glue) a piece of this foam on the back of the driver magnet (leaving ventilation open if exists).
Or put some rolled white polyester baf wadding behind it. And fixing it somehow that it stays at place.
This will do.
For a reflex box middle size:
Take egg crate foam 4-5cm thick fixed with glue on all internal surfaces.
Against a standing wave you can put (glue) a piece of this foam on the back of the driver magnet (leaving ventilation open if exists).
Or put some rolled white polyester baf wadding behind it. And fixing it somehow that it stays at place.
This will do.