Slim Jim

The owner of the original Beer Fridge sub decided that he needed something to fit into his crowded room a bit better. We decided to build a new box that would sit flat against the wall to match his DVD shelves.
This would give the opportunity to do a better job with the porting. Two straight 86mm side firing ports drop the airspeed below 10m/sec which in conjunction with 10mm flares both ends, means no more port noise complaints.
The only available position for the amp was to front mount it and to use a cable tunnel which exits at the side. Tunnel bungs cut from a swimming pool flotation toy, stop the cables from rattling. Since we are only using an 80w amp and open-weave grille cloth, overheating should not be an issue.

Photo - Slim Jim with his clothes on


A port-like tube mounted through the box to allows a safety screw to stabilise the box against the wall. This keeps things airtight and saves the owner from the usual approach of removing the driver or fitting a bracket
The grille is full height but not full width. By making it just wide enough to cover the driver and amp it supports the cloth well enough to hopefully avoid the anoying "grille slap" that I have had on other models
Apart from the port airspeed, the performance is the same as the original sub, so I'll dispense with the graphs.

Flare-it shows that the 10mm flares are adequate for just about any situation


If we were going by the book, an increase in flare size to 18mm or better wouldn't hurt.




/slim-jim.htm last modified: 31 December 2018
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