Speaker components, tools and plywood. I've just finished building my first speaker and it sounds FANTASTIC and I designed and built it myself. It's been extremely rewarding and I highly recommend everyone to make something physical yourselves. So much nicer than making anything appear on a screen.
My first box is a ported enclosure tuned to about 45hz with a cheap 15" driver and a vintage compression driver on an old cast-iron horn. It looks pretty rough, I can just barely move it by myself, but it's beautiful.
Building it made me:
* Calculate the enclosure volume and port tuning and selecting the appropriate drivers.
* Buying amps and crossovers. I got a behringer ultradrive and a 4 channel PA amp
* Draw a plan
* Measure and cut the wood with the shitty circular saw I got (took me ages, came out not terrible)
* Routing the holes for the drivers and speakons
* Assembling: drilling, fitting, screwing, gluing, mounting T-nuts for the drivers
* Finishing: Sanding, oiling, stuffing
* Soldering connectors
* Installing drivers
* Tuning, adjusting crossovers
I started in august and just finished the first box. I have enoug materials for a 2*18" subwoofer and a 12" midrange horn to go with it. Overall I spent about 2000USD in plywood (18mm baltic birch), tools (cheapest I could get), drivers, DSP and amps.
I hope to have a very nice little rig together by the end of summer.