Martin Colloms

For this modular audio component set—a review of the matching NSC 222 streamer preamp with a matching NPX 300 power supply is forthcoming—we first cover the standalone NAP 250 100Wpc stereo power amplifier, a new version of Naim's 200-series amplifier, now so extensively revised that it must be regarded as a new model.

Naim Audio's enduring, compact 200-series stereo power amplifier has been relaunched as the NAP 250, a key component of their new 200 Series. It has been updated massively in its technology and the compatibility of its connections, yet the primary circuit concept, which dates to the mid-1970s, is essentially unchanged. Recent development work has focused on helping the amplifier match up well with the new NSC 222 streamer-preamp, the NAP 250's intended companion. The new 200-series power amplifier is now called, simply, NAP 250, dropping the "DR" of the previous model. But while the suffix is now omitted, the ultralow-noise DR technology has been retained in the active, fully regulated power supplies; indeed, it has been improved.

Few designers are drawn to create horn loudspeakers. Most people's experience of horns is based on the resonating, overdriven, often overloaded PA installations heard at rock concerts and similar events. These commonly heard unmusical noises and colorations are ever-present in designers' minds. But good-sounding horns do exist; over the years, some noteworthy commercial examples have appeared, though few have been full-range.

Exposure owner/designer John Farlowe graduated from the UK's University of Sussex at the end of the swinging '60s. He put his B.Sc in electronic engineering to use at HiWatt, manufacturers of tube guitar amplifiers. His keen interest in pro audio, particularly in sound reinforcement for rock bands, led him to Midas (studio mixing desks and systems), where, as director and designer, he designed and built mixing desks and got together with the late Dave Martin of Martin Audio. They became heavily involved in sound systems for Pink Floyd. Midas desks and Martin speakers were used at many live venues, including those at London's Rainbow.

The KSL ($1800, $2100 with phono section) is a one-box line controller/preamplifier, just 2.25" high, with a nominal voltage gain of 10dB, or 3x. Despite its moderate price, the KSL is distinguished by having balanced outputs (via industry-standard XLR connectors), as well as two balanced inputs. Conventional single-ended, unbalanced outputs are also available via a pair of gold-plated phono sockets. Two unbalanced inputs are provided, plus a third via the tape monitor switch.