Martin Colloms

Franco Serblin Accordo Goldberg loudspeaker

Audacious Audio Stand Loudspeaker Reviews

Martin Colloms | Jul 18, 2024

As founder and chief designer of Sonus Faber, Franco Serblin designed and manufactured many loudspeakers of acclaimed high quality, mainly in box form. Nevertheless, he remained painfully aware that such conventional rectangular parallelepiped constructions inevitably possessed an inherent and hard-to-suppress resonant signature characteristic of box-form cabinetry, significantly differing from that for a musical instrument. Franco had long obsessed over the sound and construction of classical string instruments, violins, violas, and cellos made by grand masters over centuries. He valued highly those richly resonant, expressive, complex sonic signatures.

Thrax Audio Siren loudspeaker

Audacious Audio Stand Loudspeaker Reviews

Martin Colloms | Mar 22, 2024

Based in Bulgaria, European audio company Thrax has been active since 2009. Their ingenious and varied design approaches seen over several product lines have continued to intrigue me with their conceptual originality, innate musicality, and imaginative use of a broad spectrum of technologies. Their products range from valve (tube) amplification to digital audio and, more recently, loudspeakers . . . The range of distinctive high-end electronics has continued to expand to include a loudspeaker, the standmount Lyra, now joined by the smaller Siren ($13,600/pair), also a standmount and the subject of this Stereophile review.

Naim NSC 222 streaming preamplifier & NPX 300 power supply

Digital Processor Reviews Solid State Preamp Reviews

Martin Colloms | Dec 14, 2023

Naim has comprehensively reimagined its Classic Series, which has been around for some 20 years with improvements along the way. Included in the new range of products is the 200 series, comprised of two products: the NAP 250 power amplifier, which I reviewed in the November 2023 issue of Stereophile, and the NSC 222 streaming preamplifier ($8999), which is reviewed here. A third component in the New Classic series, the NPX 300 power supply (also $8999), which is intended to be paired with the NSC 222 and other Naim components, is also considered in this review.

Naim Classic 200 Series NAP 250 power amplifier

Solid State Power Amp Reviews

Martin Colloms | Oct 12, 2023

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.

Sony DTC-1000ES R-DAT recorder & Sony PCM-1630 A/D converter

Digital Processor Reviews Historical

Martin Colloms | May 06, 2021 | First Published: Aug 01, 1987

With the furor over the launch of DAT (digital audio tape), it is worth remembering that commercial digital recorders have been with us for some time now: it is now nearly a decade since studio PCM converters were first successfully used for audio recording in conjunction with a VCR (which uses a helical spiral recording via a spinning drum to achieve the high writing speed).

Avantgarde Acoustic Duo loudspeaker

Floor Loudspeaker Reviews

Martin Colloms | Nov 06, 2020 | First Published: Jun 01, 1998

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.

Wilson WATT loudspeaker

Stand Loudspeaker Reviews

Martin Colloms | Apr 08, 2020 | First Published: Feb 01, 1988

Landmarks in speaker design have been few and far between. There are a few certain contenders: in the UK, the original Quad Electrostatic and the ESL-63 qualify, while the Celestion SL600 scored a big point for all small monitors; the Spendor BC1 changed forever the notion that cone speakers were always colored and that big boxes were essential for good sound. In the States, Apogee has taught us much with their surprising mid-treble ribbon-based designs. Other technologies have shown promise but have not achieved real commercial success.

Exposure CD Player

CD Player/Transport Reviews

Martin Colloms | Jun 04, 2019 | First Published: Nov 01, 1997

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.

Dick Olsher Dahlia speaker

Features Historical J. Gordon Holt Stand Loudspeaker Reviews

Dick Olsher, J. Gordon Holt, Martin Colloms | Jun 07, 2018 | First Published: Feb 01, 1986

Do-It-Yourself (DIY) loudspeaker projects are quite common in the UK, where details about several excellent designs, including a recent one by Martin Colloms, have been published for public domain consumption. Stateside, the situation is rather grim, where only an occasional subwoofer project (always popular) makes it into the commercial magazines.

Krell KSL line preamplifier

Solid State Preamp Reviews

Martin Colloms | Aug 10, 2017 | First Published: Jul 01, 1991

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.

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