Leak are the latest manufacturer to look back at classic products, improve the design with modern materials but staying true to the original blueprint. The new Sandwich design speakers have Peter Comeau to thank, his years of knowledge across various Hifi projects give him the wealth of expertise and a good ear.
The Leak Sandwich 250 is a larger format, 3-way standmount loudspeaker with a 11” (280mm) low frequency ‘Sandwich’ driver, a 4.25” (108mm) ‘Sandwich’ mid-range driver and 1.2” (30mm) coated textile dome high-frequency driver. The Sandwich 250 is available with, or without, a matching custom-specified stand, finished in a matching real-wood veneer.
We think the Sandwich 250 look stunning and the silver bezel sets off the Walnut cabinet perfectly.
High Frequencies
The isolated compartment for the HF unit prevents modulation from the rear bass and eliminates cavity residences. A stiff, long voice-coil, powerful magnets and compliant suspensions ensure ample linear excursions of the specifically designed HF unit.
Mid and Low Frequencies
The mid-bass and bass-frequency units have a long voice coil, powerful magnet and compliant suspensions to ensure large linear excursions.
The Sandwich cone is many times stiffer, and no heavier than conventional cone materials. The scientifically developed diaphragm gives freedom from colouration and break-up of resonances. The specially shaped dome further strengthens the cone and eliminate interference effects.
Cabinet
The airtight outer cabinet is completely sealed with a specially designed rear porting system. Both the 150 and 250 models are fitted with dual ABS bass ports, with a precision flared design. The cabinet offers efficient air pressure equalisation, without ‘chuffing’.
Specially developed with a 'sandwich' construction and front-to-rear bracing ensures 'dead' cabinet walls, giving deep clear bass without "boxiness".
Finished in an exquisite hand-applied, real-wood veneer. Both the diecast frame and the baffle hole, are shaped and positioned to give a flat response by eliminating diffraction and cancellation effects.
Internal Considerations
Rolls of custom-specified damping provide a dual purpose: i) eliminate cavity residences and ii) extend bass response downwards by converting internal air pressure changes from adiabatic to isothermal.
Model Sandwich 150
General description 2-way vented-box/standmount
Design philosophy and core technology
Enclosure type Bass reflex
Transducer complement 2-way
ABR
Bass driver 6.5"(170mm) Aluminium-Foamcore Sandwich cone
Midrange driver
Treble driver 1.2"(30mm) Coated Textile Dome
Full-range driver
AV shield No
Sensitivity (2.83V @ 1m) 86.5dB
Recommended amplifier power 25-150W
Peak power handling
Peak SPL 106dB
Nominal impedance 6Ω (8Ω Compatible)
Minimum impedance 4 Ω
Frequency response(+/-3dB) 44Hz ~ 26kHz
Bass extension(-6dB) 38Hz
Crossover frequency 2.4kHz
Cabinet Volume (in litres) 19.6L
Dimensions (mm)
Height (on plinth) 415mm
Width 250mm
Depth (with terminals) (290+25)mm
Carton size 650*400*530mm
Net weight 12.3kg/pcs
Gross weight 27kg/ctn
Finish Real Wood Veneer - Walnut
Standard accessories Rubber feet
