The Thor DIY speaker is on the cover of the May issue. Billed as the world's first scientifically-designed transmission line speaker, it grew out of new drivers designed by SEAS following Joseph D'Appolito's configuration of center tweeter flanked by woofers above and below. The GW Labs upsampling DAC that AUDIOPHILE AUDITION reviewed last month is reviewed here by Gary Galo. Audio construction articles include: Borbely All-FET line amp, a moving coil setup box, a Circlotron amp, Updates to McIntosh, and an infinite box subwoofer. The late Henry Kloss is honored with a personal tribute to this audio legend. - John Sunier