John Atkinson

Stereophile has favorably reviewed many NAD amplifiers over the decades. One of the most recent was the Master Series M10 class-D streaming integrated amplifier, which I purchased to use as my daily driver after I reviewed it in January 2020. The M10's price included a free license for Dirac Live low-frequency room equalization, which I found invaluable with my long-term reference standmounts, the KEF LS50s. So when I learned that NAD was introducing a 50th Anniversary integrated amplifier, the C 3050 LE, which also included Dirac Live, I asked for a review sample.

"A 10" two-way?!?!" I couldn't help gasping in surprise when I unboxed the MoFi Electronics SourcePoint 10 standmounted loudspeakers, which cost $3699/pair.

Some background is in order. Using a large-diameter woofer endows a conventional two-way speaker with potentially high sensitivity and extended low frequencies. However, the large woofer's radiation pattern narrows at the top of its passband, whereas that of a tweeter mounted on a flat baffle is at its widest at the bottom of its passband. Even if the drive units' outputs are well-matched in the speaker's on-axis response, this discontinuity in the speaker's off-axis behavior results in an in-room balance that will sound bright. This is why favorably reviewed two-way designs tend to use a woofer with a 6.5" or even smaller diameter.

When I put together my first hi-fi system in the late 1960s, the amplifier was a Kenwood integrated. Soon I replaced the Kenwood with a Sony integrated, and then, a few years later, I bought a Lecson preamplifier and power amplifier pairing. It's been separates for me ever since.

Probably best-known in recent years for their best-selling "baby" speaker, the Diamond, Wharfedale is one of the UK's oldest manufacturers of loudspeakers. The company was the subject of a management buyout earlier this year, following a rather unsettled period when it changed hands several times. Now with American distribution as of 1989 by Vector Research (footnote 1), the brand is reinventing itself in the US with two new ranges of loudspeakers, the 507.2 being one of the "audiophile" models. Both drive-units are made in-house; the first generation of Wharfedale loudspeakers to feature this 19mm aluminum-dome tweeter—the 506, 508, and 708—appeared in early 1985.