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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: High End Mini Monitor Cabinet Material? posted by hahax@verizon.net on June 14, 2024 at 15:52:47:
A couple thoughts.
The cabinet does one main thing in a sealed alignment and something in addition in a vented system.
Job one is blocking the anti-phase radiation from the rear of the cone. Here the more ridged the enclosure, the less flexing and greater attenuation of the "inside" sound.
The more ridged something is per mass, the higher it's resonate frequency AND the higher it's Q or sharpness, the more the exciting force can be magnitude.
The cabinet is something like how a loudspeaker driver designer described the cone material, it's the lightest, strongest thing with a low enough Q and cost.
You do not want the walls to resonate so many speakers have bracing internally. By adding appropriate bracing, one is adding stiffness and lowering the Q both. For a vented box, the box has to be especially stiff to get the most out of the port. Looking at the impedance curve for the vented system, leaks and losses like box flexing show up at the dip between the two peaks. Losses raise that dip / reducing the port output.
Up high, above any mechanical box mode, there is the higher frequency sound. Depending how high the woofer goes and how thin the cone material is, some of the radiation reflects off the inside walls and can radiate right through the cone body especially on a large light weight cone.
Here fiberglass or cotton etc can absorb that AND to a degree, to the woofer, appears to have made the cabinet slightly larger.
MDF is cheap, easy to work with and machines well. It is dense, fairly dead but not very strong and subject to humidity and compared to plywood, doesn't hold screws as well.
My favorite material and the close to the only wood i use at work is Baltic Birch. This is very strong plywood made in many layers, it is slower to cut than pine plywood but machines very well with a router or cnc. I usually finish prototypes in spar polyurethane which produces a mild gold / amber hue and is a tough finish.. There is some stuff for boats that works amazingly well, if interested google Gleem2 polyurethane and watch the how to video.
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Follow Ups
- RE: High End Mini Monitor Cabinet Material? - tomservo 06/15/2409:02:41 06/15/24 (0)
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