Isetta 2.1 Speaker Build

Isetta 2.1 Speaker Build


Project Category:

Project Level:

Project Time:
20+ Hours

Project Cost:
$100 – $500

Project Description:
IMplementation of Paul Carmody’s Isetta 2.1 Enclosure with an added built in amp.

Design Goals:
Make a small box that doesn’t look like something you can buy cheaply in a store. Also, to have fun.

Driver Selection:
1 – Tang-Band W5-1138SMF

2 – Fountek FE85

Enclosure Design:
Solid Santos Mahogany, African Mahogany Veneer, Solid Wenge, and 1/2in MDF were used for the enclosure.

Enclosure Assembly:
Hardwood and veneered MDF so it does require some thought on wood movement. There is a full annotated gallery of the build with some wood working tips here –

Crossover Design:
Staight from Paul Carmody’s Isetta design – (

Really like the sound and the look of the end product. Fun build.

About the Designer:
A woodworker and recovering engineer just getting into making speakers, because… well, it is just fun.

Project Parts List:

3 Ohm 10W Resistor Wire Wound 5% Tolerance
Dayton Audio 0.50mH 18 AWG Perfect Layer Inductor Crossover Coil
100uF 100V Electrolytic Non-Polarized Crossover Capacitor
12uF 100V Electrolytic Non-Polarized Crossover Capacitor
Fountek FE85 3″ Full Range Speaker Driver
Tang Band W5-1138SMF 5-1/4″ Paper Cone Subwoofer Speaker
Acousta-Stuf Polyfill Speaker Cabinet Sound Damping Material 1 lb. Bag


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