sub box design
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QuarterWave - Bluetooth Transmission Line Speakers by Cary Gallaway & Donald Thomas — Kickstarter. The QuarterWave is a handcrafted Bluetooth speaker system which implements a tapered acoustic transmission channel designed to produce a full-range superior quality sound. The QuarterWave is designed to transform any music listener into a true audiophile as we've removed the guesswork in finding the acoustic system to brilliantly reproduce your favorite music.