ProAc is a UK-based loudspeaker company featuring an entire range of products from two-way bookshelf models to center channels and satellites to full-range floorstanding models. ProAc products are famous for their superb craftsmanship and variety of finishes, as well as refined sound quality. Founded in 1979 by Stewart Tyler, ProAc is based in Northamptonshire.
In the US, ProAc is distributed by Modern Audio
Notable products include the ProAc Studio 140 Mk2 which has a frequency response of 25 Hz to 30 kHz and a sensitivity of 91 dB. Other notables include the Response D18 which is rated at 30Hz to 30kHz and the ProAc Studio 100 bookshelf speakers that are rated at 35hz to 30Khz.
For an in-depth history of the company, check out the Wikipedia article.