Cinder Block Speakers

Cinder Block Speakers

Tim Konicek

Project Category:
Bookshelf Speakers

Project Level:

Project Time:
8-20 Hours

Project Cost:
$100 – $500

Project Description:
Bookshelf speakers constructed using Center blocks (CMUs) and birch plywood.

Design Goals:
create attractive, good sounding speakers using cinder blocks for their acoustical dampening properties.

Driver Selection:
Classix II MT kit (Part# 300-7110)

Enclosure Design:
standard cinder blocks with 3/4″ birch plywood for fronts and backs

Enclosure Assembly:
front and back held against cinder block using 1/4″ threaded rod and allen T nuts

Crossover Design:
Standard Classix II crossover components which came with the kit.

Tips & Tricks:
I used a circle cutting rig for my router to cut the holes. i copied the holes in the kit front. I traced the openings in the cinder block to decide where to drill hoes for the threaded rod. There are a lot of cinder blocks out there, so choose the ones that have the largest openings, as the woofer just fit. I cut off the threaded rod with a grinder, using 2 SS nuts to mark the spot to cut, then beveled the ends to make it easier to center the nut when assembling.

It was my first kit. A little more challenging than i thought wiring the crossover. I’ll probably try this again with a new cabinet design. I’m no audiophile, but I really like the sound of these speakers.

About the Designer:
I love taking on new projects that teach me a new skill and give me a reason to buy a new tool.

Project Parts List:

Classix II MT Bookshelf Speaker Kit with Baffle Only

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