Audio Design Associates was founded in 1977 by Albert Langella and Peter McKean. ADA helped pioneer multi-room and distributed audio systems, and hence has emerged as a leader in the custom installation industry. ADA was a founding member of CEDIA, and is a member of the CEA. ADA is one of the few large electronics companies that still manufactures its components in the US.
Notable products include the ADA 8000 series of multi-room receivers, the ADA PTM series of whole-home amplifiers, and the ADA Cinema Rhapsody home theater preamp.
The ADA TPA-1, for example, is a tube preamp with integral iPod dock. It's matched with the PF-2150 two channel amp. The PF-2150 is a Class A/B design with passive cooling and is rated at 600 watts