LEAK SANDWICH 250 - PAIR

A great invention for speakers

Throughout the history of broadcasting and recording, some outstanding developments have become milestones in the advancement of sound reproduction.

One of these milestones was the world's first low-distortion amplifier: the famous original Leak Point One, in 1945. Another was the great pioneering breakthrough with the invention of the extraordinarily rigid Leak sandwich cone diaphragm, which was demonstrably of great strength and many times stiffer than all conventional cone shapes of the time.

To understand the impact of this innovation, one must remember that to achieve low distortion, the movement of a speaker's diaphragm, or cone, should follow as accurately as possible the waveform of the signals applied to its voice coil. The ability of the current to accurately follow these pulses depends on the lightness and rigidity of the cone. Many conventional cones: paper, impregnated fabric, plastic, aluminum etc. they generally suffer from low rigidity. This results in significantly larger areas of the cone vibrating in motion, not controlled by the voice coil. These uncontrolled emotions produce transit “hangovers,” amplitude distortion (peaks and valleys in the frequency response), and intermodulation distortion (lack of clarity of spurious tones). These defects are inherent in almost all direct radiator speaker systems that use conventional cones, regardless of cost.

It is often not sufficiently realized how profound an influence the speaker housing (the cabinet) has on the overall acoustic performance. Its design requires a high degree of electroacoustic knowledge as well as the design of the motor units themselves. The new Leak Sandwich cabinet benefits from 60 years of technological development since the original. The structure is made up of a composition of MDF and composite panels, thus creating a second "sandwich" reference, with the panels stratified for optimal resistance of the furniture. While the new cabinet blends clever bracing with this "sandwich" of materials, it also retains specific front-to-back bracing, with the distinct countersunk screw visible on the back, a famous feature of the original.

The technology found in Leak audio devices features science and innovation galore, but industrial design often

attracts favorable attention. Just like the warmly received Leak Stereo 130 and 230 integrated amplifier models, the new Leak Sandwich 150 and 250 speaker models maintain Leak's understated, classic style. Finished in a sumptuous walnut and real wood veneer, the cabinet is adorned with a matching aluminum trim insert and finished to the same exemplary standards as the driver finishes and cone materials. The decorative grille fabric was specifically chosen to match the classic Leak style with specifications for maximum acoustic transparency.

A keen eye will also notice that the new Leak Sandwich 150 and 250 are supplied in perfectly matched pairs with a "handmade" array presentation. Much more than just industrial design features, the meticulous positioning of each driver is considered to the nth degree, thus allowing for truly precise stereo soundstage projection.

With the Leak Sandwich 150 and 250 the high frequency driver has been developed, incorporating a damped rear chamber to absorb the output from the rear of the dome. This innovation not only isolates the HF unit from the rest of the speaker, but has the added benefit of reducing the resonant frequency of the treble unit. Bringing the resonant frequency below the crossover region means that the audible spectrum of low, mid and high frequencies can be stitched together with an added dimension of detail and harmonics, eliminating the need to dramatically adjust high frequency definition. And this very stitching is driven by a world-class crossover, developed over thousands of hours of listening, not just simulation as is the trend in modern speaker design.

The Leak Sandwich 150 and 250 represent the pinnacle of innovation that began in 1961 with the original Leak Sandwich.

These technological advances are implemented with the utmost respect for tradition, as well as the continuous aspiration to forge sound reproduction equipment of the highest quality, accessible to every discerning audiophile.

The Leak Sandwich 150 is available in the format of a 2-way standmount speaker with a combination of 6.5" (170mm) low frequency 'Sandwich' drivers and 1.2" (170mm) covered fabric dome high frequency drivers " (30mm).

The Leak Sandwich 250 is a larger format 3-way stand-alone speaker with an 11" (280 mm) low-frequency "Sandwich" driver, a 4.25" (108 mm) mid-frequency "Sandwich" driver ) and 1.2" (30mm) covered fabric dome. high frequency driver. The Sandwich 250 is available with or without a custom matching stand, finished in a matching real wood veneer.

Characteristics

High frequencies

The isolated compartment for the HF unit prevents rear bass modulation and eliminates cavity residences.

A long, stiff voice coil, powerful magnets and compliant suspension ensure wide linear excursions of the specially designed HF unit.

Medium and low frequencies

The mid and bass units have a long voice coil, a powerful magnet and compliant suspension to ensure wide linear excursions.

Sandwich cone is many times stiffer and no heavier than conventional cone materials. The scientifically developed diaphragm

free from coloration and resonance breakdown. The specially shaped dome further strengthens the cone and eliminates interference effects.

Custom damping rolls provide a dual purpose

i) eliminate cavity residences e

ii) extend the bass response downwards by converting changes in internal atmospheric pressure from adiabatic to isothermal

Cabinet

The airtight external cabinet is completely sealed with a specially designed rear door system. Both the 150 and 250 models feature dual ABS bass ports, with a precision flared design. The cabinet offers efficient air pressure equalization, without "puffs".

Specially developed with a "sandwich" construction and front-back bracing ensures "dead" cabinet walls, delivering deep, clear bass without "boxes".

Finished with an exquisite hand-applied real wood veneer.

Both the die-cast frame and baffle hole are shaped and positioned to give a flat response while eliminating diffraction and cancellation effects.

Internal considerations

Custom Damping Rolls provide a dual purpose:

i) eliminate cavity residences e

ii) extend the bass response downwards by converting changes in internal atmospheric pressure from adiabatic to isothermal.

DESCRIPTION

Pair of 3-way bass reflex stand-mount speakers

25-250W – Impedance 6 Ohm, Sensitivity 88.5 dB

1 x 280mm Aluminum Foam Core Sandwich Cone Woofer 1 x 108mm Aluminum Foam Core Sandwich Cone Mid

1 x 30mm fabric dome tweeter

Dimensions with feet and terminals (W x H x D): 370 x 655 x 300+30 mm

Weight (each): 27.3 kg

PRICE REFERS TO THE PAIR OF SPEAKERS

STANDS NOT INCLUDED