Project Category:
Portable Speakers

Project Level:

Project Time:
20+ Hours

Project Cost:
$100 – $500

Project Description:
A combined two input stereo amplifier with tone controls and stereo speakers in a custom enclosure. Used as a synthesizer practice amp and for general music enjoyment.

Design Goals:
Three key design goals: 1) Stereo amp with good room filling volume, and tone control. 2) Portable size, easy to sit on table, shelf, or floor. 3) A custom design style retro candy apple red with a feel of the hot rods/Fenders guitars from the 60’s.

Driver Selection:
Part # 297-428 – HiVi B3N 3″ Aluminum Driver Round Frame

Enclosure Design:
Custom design, sealed enclosure, stereo. 1.5 Cu/Ft per speaker.

Enclosure Assembly:
Used PVC sheets, from hardware store. Bonded with two part epoxy. Inside lined with rubberized coating. Speaker boxes filled with poly-fiber.

Crossover Design:
Direct, no cross-over.

Products Used:
Spkr Part # 297-428 – HiVi B3N 3″ Aluminum Driver Round Frame

Amp Part # 310-300 – Lepai Tripath-LP2020A+ mini audio amp
Modified per website:

Silver flake spray, Candy apple red transparent spray. Final acrylic clear coat.

Tips & Tricks:
The PVC sheets are nice in that they are easy to machine, inexpensive and don’t have grain to worry about and tend not to have un-wanted resonances like wood. Need to be prepped well for painting.

The amp sounds great, used in large lab with a two synthesizer input, plenty of volume Bass, Midrange, and high end solid.
Sounds bigger than it looks

About the Designer:
Worked in Aerospace, and Bio-med electronics design work. Hobbies are electronic music synthesizer building and music composing and recording.

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