Two way, very small floor-standing speakers.
"From the moment I heard the Tetra Loudspeakers at the 2002 CES, I knew I had to have a closer listen. After a bit of negotiation with Adrian Butts and Wayne Prince of Tetra, I was able to get a pair of their Rebels for review. They were impressive from the start—not physically, mind you, as they measure only 29 x 8.5 x 11.5 inches—but they had a swagger and snap that grabbed my attention. Their frequency response measurements are 48 to 28 KHz, and sensitivity is 88 dB. My Antique Sound Labs MGSPM25DT monoblocks, with their twenty-five beautiful tube watts, drove them to quite high sound levels."
as reviewed by Francisco Duran and Roger McNichols, Jr.