Source: Press Release, Last Accessed: 2024/02/29

Leak’s line-up expands further with the addition of two loudspeaker models, once again inspired by their illustrious past. The Sandwich 150 and Sandwich 250 take the blueprint established by the original, highly innovative Leak Sandwich speaker, which debuted in 1961.
The original Leak Sandwich speakers were designed when vinyl and valve amps ruled the high-fidelity sound waves. The requirements of modern-day speakers are different: today’s solid-state amps deliver far greater power, and modern speakers need power handling to match. The demands placed on frequency response by contemporary digital recordings and sources, especially at the extremes of bass and treble, are also quite different to the midrange-focused vinyl records and turntables of the 1960s, the company says.
The new Leak Sandwich 150 and Sandwich 250 are ideally adapted to these requirements. Both are standmount speakers, the former a two-way design with a height of 41.5cm and the latter a much larger three-way model standing 65.5cm tall. According to the press release, they are perfectly suited to a wide range of amplifiers and deliver excellent frequency and transient response – exceptional for speakers of their class.
The Sandwich 150 incorporates a 30mm textile-dome tweeter and a mid/bass driver with a 170mm Aluminum-Foamcore Sandwich cone, while the Sandwich 250 combines the same tweeter with 280mm bass and 108mm midrange drivers, both of which feature Aluminum-Foamcore Sandwich cones. The treble unit includes a damped rear chamber to absorb the output from the back of the 30mm dome, isolating it from the rest of the loudspeaker and reducing its resonant frequency to below the crossover region. This allows bass, mid and high frequencies to be sewn seamlessly together with an added dimension of detail and harmonics, via a crossover network developed using sophisticated computer analysis and hundreds of hours of listening tests.
The Leak Sandwich 150 and Sandwich 250 are supplied in matched, mirror-imaged pairs, with the treble unit (and midrange unit, in the case of the 250) offset from center. With one speaker optimized for the left channel and the other for the right, a precise stereo image within a deep, broad soundstage is assured when sited appropriately, Leak states.
The cabinet walls are formed from an outer layer of MDF and an inner layer of high-density particle board – the different densities of these materials help to scatter panel resonances – enhanced by a filling of special glue that bonds the layers and provides resonance-damping properties. This is combined with precisely positioned spot-bracing, together with a specific front-rear brace that echoes the design of the original. The cabinets are dual ported at the rear, augmenting the speakers’ bass response.

For more information: https://www.leakaudio.com/

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