
Another Isetta Boombox


Designer:
Fercho
Project Category:
Portable Speakers
Project Level:
Intermediate
Project Time:
8-20 Hours
Project Cost:
$100 – $500
Project Description:
Boombox as originally design by Paul Carmona, interior is 1/2″ MDF with locking joints and unique exterior design. Unlike other designs, I opted for a TPA3116 2.1 plate amp 50W/50W – 100W with exterior brick 24vdc transformer
Design Goals:
I wanted the speaker to resemble the look of the Bose 901 V, I liked its design.
Driver Selection:
Tang-Band W5-1138SMF
Fountek FE85
Enclosure Design:
Exterior in Walnut with water based polyacrylic in satin sheen. Front baffle with “vintage” fabric.
Enclosure Assembly:
Locking rabbets and dado joints all inside in order to make the enclosure air sealed as much as possible.
Crossover Design:
The crossover as described by Paul Carmona for the Fountek full drivers, soldered point to point onto a 1/4″ MDF board. I only replaced the 100uf electrolytic capacitor with a more expensive film type.
Conclusion:
Big thank you to Paul Carmona for sharing this design, very grateful. As many others that have build this little speaker, I am very happy with the sound that emanates from this speaker, could not be any better.
Tips & Tricks:
I decided to use a plate amp because like a sub, this amp is attached on the exterior. I did not want an internal amp like other builders have used, because it reduces is internal premium space; the amp uses exterior brick tranformer and it also allows me to hook up a Dewalt 20v battery and thus making unnecessary to put internal batteries, chargers, etc. As per bass port tube, I found that the paper mailing tube has the exactly 1.5″ diameter that Paul specifies.
About the Designer:
Paul Carmona is the designer, I merely followed his directions and the only thing I did was braced it differently internally and give it the look I wanted. Sorry for not posting the build, so many DIYurselfers have already posted tons of “hows”.
Project Parts List:
Part# | Description | Qty. |
264-917 | Tang-Band W5-1138SMF | – |
027-430 | 12uF 250V Polypropylene Capacitor | – |
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