List for builders

On this page we have collected various lists of things that we needed while building the ghettoblaster. If you're building your own, these might serve as a useful checklist. They're probably missing some things that we needed but just forgot to list, so don't rely solely on these. Hopefully this can still save a trip or two to the shop for someone else.

Most helpful threads

Here are some articles and threads we found to be most helpful. When googling, note that ghettoblasters go with a variety of names, including 'boombox', 'boomblaster' and 'boominator'.

Blueprints

Here are the blueprints of our blaster. Feel free to use them. If you do, we'd be really happy to see some photos of your project!

Strategic dimensions are:

  • Weight: 9.9 kg
  • Width: 49.1 cm
  • Height: 28.8 cm
  • Depth: 15.8 cm

Design criteria

  • Each SP60 driver requires 4-5 liters of breathing space.
  • Speakers should share a single space.
  • The space should be sealed (air tight).
  • It must be possible to easily transport the box and audio source.
  • The audio source should be possible to put into cover (inside the box).
  • You must be able to access the insides of the box afterwards, e.g. for replacing components.
  • Use as much rectangular pieces as possible to avoid sawing and to ease assembly.

Electronic parts

Total cost for electronics: 260€

  • 2x Monacor SP-60 (bass-midrange speakers), 15.95€/piece plus shipping
  • 2x Monacor DT99 (tweeters), 19.45€/piece plus shipping
  • 1x AMP6 Basic Sneaky (amplifier kit, pre-assembled), 55€ plus shipping
  • 1x 12V 7.2Ah VRLA battery, CT-Leader, 20€
  • 1x Mascot 2240 12V 1A battery charger, 44€
  • 1x Precision potentiometer, 13€, was actually left out of the design, even though we bought it...
  • Wiring, connectors, electric tape etc, around 30€
  • Shipping of various items around 30€ total

Parts for the case

Total cost for enclosure: 110€

  • Pre-cut plywood boards (18€)
  • L-pieces for mounting lock bolts (3€)
  • Fasteners for the shoulder strap (4€)
  • Screws, washers, nuts and bolts (10€)
  • Wood screws (a few €). Ignore cross (+) and especially slot screws (-) as they have horrible grip. Use torx (*) screws. They're pure gold.
  • Bolts, nuts and washers (a few €)
  • Moisture resistant wood glue, Erikeeper Plus (7€)
  • Epoxy glue for wood-metal bonding (5€)
  • Acrylic sealant (5€) for sealing the box. We bought it but didn't actually use it, because we were lazy, but it would probably be a good thing to do at some point :)
  • Speaker grilles, in our case, 92mm fan finger guards (4€)
  • 2 cans of spray paint (10€ total)
  • Detail paint (4€)
  • White base coat paint for details. We used something we had at home.
  • Window sealing tape for sealing the back end (a few €)
  • Tape and miscellaneous other stuff, 25€

A good tip: buy excess screws and nuts as they cost next to nothing and you will lose them. Really, you will. We also noticed that acid resistant screws will cost ten times the normal ones so keep an eye out for the price tags.

Tools

We needed at least the following tools. We are listing prices whenever we didn't have or couldn't borrow a tool, but needed to buy the thing for this project.

Total money spent on tools: 50€

  • Dremel, a multi-purpose tool with several different heads. Extremely valuable tool!
  • Electric screwdriver. Get one of these, even the cheapest, because there will be a lot of screws and manual screwing will be very tedious.
  • Drill (drill press would be superb) and wood drill bits of needed sizes
  • Hole cutter for speakers and lock nuts (10€)
  • Pencil, tape measure, ruler
  • Sandpaper assortment (4€). A sander power tool will probably make life a lot nicer, we wish we'd have bought one. Get sandpaper with several grit sizes (it's cheap). Get the very coarse grained sandpaper as it'll save you a lot of effort at the beginning.
  • Wrench
  • Coping saw to make (concave) cuts (8€)
  • Clamps for holding the glued parts (24€)
  • Multimeter
  • Small brush for detail painting