Nebulous Snail

Nebulous Snail

C Allison

Project Category:
Portable Speakers

Project Level:

Project Time:
8-20 Hours

Project Cost:
$100 – $500

Project Description:
2.1 Channel Bluetooth speaker with maximum visual and acoustic appeal

Design Goals:
Priority given to mono operation with another snail as a stereo pair, with aux cable input only. Compact transmission line subwoofer operating from 45 to 135 (1 1/2 octaves,) with minimal damping. Has controlled directivity and symmetrical radiation pattern with upward tilt. Minimal passive crossover components.

Driver Selection:
ND140-4 woofer (P/N: 290-216) DMA58-8 fullranges (P/N 295-583) and audax tweeters

Enclosure Design:
Side firing woofer. Spiral transmission line with flared terminus. Compact curved vertical front array MTMTMTM aperiodic loaded

Enclosure Assembly:
Vinyl plank flooring forms the inner spiral and outer shell. HDPE baffle with integrated handle. Clear Poly-carbonate side panels with applied epoxy coating

Crossover Design:
Center tweeter 1st order 8kHz. Outer tweeters in series 1st order 6kHz. Outer fullranges 1st order 1kHz for baffle step correction

Tips & Tricks:
Rear terminus benefits greatly from boundary gain. Most impressive when mounted high upside-down in corner

Good sound for a portable speaker.

About the Designer:
Self-unemployed cabinet maker with a tolerant wife

Project Parts List:

TPS3116D2 Class D 2.1 Bluetooth 4.0 Amplifier Board 2 x 50W + 100W with Filter and Volume Controls
Dayton Audio ND140-4 5-1/4″ Aluminum Cone Midbass Neo Driver 4 Ohm
Dayton Audio DMA58-8 2″ Dual Magnet Aluminum Cone Full-Range Driver 8 Ohm
Sonic Barrier AB-4 Sound Insulation Absorbing Sheets 31.5″ x 19.68″ 4 pcs.
Acousta-Stuf Polyfill 1 lb. Bag Speaker Cabinet Sound Damping Material

1 comment

Add yours

+ Leave a Comment