Building a Subwoofer
Where to start? There's two parts to this project. Amplifier
and the Box.
In Auckland you can go to either Jaycar Electronics or
Dick Smith Electronics and find
some bits and pieces to put together. The prices stated below are
subject to change.
Subwoofer filter $35.20 (actually, just a couple of tuned coils would
An alternative to the above is the K5404
a full active cross-over network $48.20
The 100W into 4ohm amp, yeeehaaa $59.40
Power supply (some darn biggun caps and dethump relay) $42
Big Transformer $59.95
305x90x200mm case (which is probably too small) $36.80
An alternative to the above is the H2481
rack case $88
Frankly, those boxes are quite expensive. Maybe Jaycar has some better
alternatives or you could make your own. Metal is better. It ignites
less often than wood.
That's about $233. Maybe about $250 after you get the extra things:
A mains plug (tap-on plugs are the best), a fuse holder, some cool
flashy lights and switches :) and some power cable (3 metres is probably
about right) and some heavy MDF for the box. Jaycar has some very
impressive speaker grills.
You need to have as much technical information about your subwoofer
speaker as possible because there is a bunch of physics calculations
needed to get the box right.
Subwoofer Box and Speaker