LEAK | SKU: NEW-LESW100-WAL-PR | Barcode: 703341620288

LEAK Sandwich 100 Loudspeakers - Walnut - Pair

A compact standmount that carries one of British hi-fi’s most storied driver technologies into a smaller, more accessible package — the LEAK Sandwich 100 brings the Rohacell foam and aluminium skin Sandwich cone to listeners whose rooms demand something more manageable than the Sandwich 150 or 250.

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✔ 60-Day Money-Back Guarantee — Try it risk-free for 60 days
✔ Free Shipping on orders over $49
✔ Financing Available — Pay over time | Learn more
✔ Price Guarantee — We match authorized dealer pricing | Details
✔ Expert Help — Call us at 800-942-0220 weekdays 9am–6pm EST

$795.00

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New Demo

Available in 7 days or less

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What You Need to Know

The LEAK Sandwich 100 — A British Classic Made Compact

LEAK is a British audio brand with a history stretching back to 1934. The company went silent in the late 1970s and has recently been revived, bringing back some of the most respected names in British hi-fi alongside genuinely new engineering. Among the most celebrated designs LEAK ever produced was the original Sandwich loudspeaker, introduced in 1961. Its defining innovation — a driver cone made by bonding aluminium skins to a lightweight foam core — was so effective that it influenced speaker design for decades and made Harold Leak’s name synonymous with acoustic precision in Britain.

The modern LEAK Sandwich series revisited that concept in 2024 with the Sandwich 150 and Sandwich 250. Both are impressive, but both are sizeable. The Sandwich 100 is the answer for listeners who want the same driver philosophy in a cabinet that fits real-world spaces. It is the smallest and most affordable model in the current Sandwich lineup, launching in April 2026 at $699 per pair, and it was designed from the ground up by Peter Comeau — LEAK’s Director of Acoustic Design and one of Britain’s most respected loudspeaker engineers.

The Sandwich Cone — Where This Speaker’s Character Comes From

To understand why the Sandwich 100 exists and why it sounds the way it does, you need to understand the Sandwich cone. A conventional speaker cone is typically made from a single material — paper, polypropylene, aluminium, or similar. Every single-material cone faces the same fundamental compromise: the stiffer you make it, the heavier it gets; the lighter you make it, the more it flexes. Flexure is the enemy of accuracy. When a cone flexes, it distorts the signal, adding coloration to the sound.

Harold Leak’s 1961 solution was a composite approach: bond a lightweight foam core between two thin aluminium skins. The result was a diaphragm that was simultaneously rigid and extremely light — the foam provides structure and damping, the aluminium skins provide the stiffness. This combination pushes resonance modes far beyond the audible band, meaning the cone moves as a single piston without breaking up or flexing within the frequencies you actually hear. The engineering term for this is pistonic motion, and it is associated with low distortion, fast transient response, and a clean, uncolored midrange.

The Sandwich 100’s 150mm mid/bass driver uses the modern evolution of this principle: an aerospace-grade Rohacell structural foam core bonded between aluminium outer skins using aerospace-grade adhesives. Rohacell is a closed-cell foam used in aircraft and Formula 1 components for its exceptional strength-to-weight ratio. It is significantly more refined than the expanded polystyrene used in the original 1961 design, but the acoustic logic is identical: keep the cone light, keep it stiff, keep it controlled.

The 30mm Textile Dome Tweeter — Larger Than You’d Expect

Most standmount speakers at this price use a 25mm or 26mm tweeter. The Sandwich 100 uses a specially developed 30mm coated textile dome — meaningfully larger than the category norm. This is a deliberate engineering choice with practical consequences. A larger tweeter dome can be used with a lower crossover point, because it can handle more power in the upper-midrange frequencies without distress. A lower crossover point means the mid/bass driver handles less of the tweeter’s work, and the two drivers blend together more seamlessly in the region where the human voice lives.

The tweeter also includes a damped rear chamber that absorbs the output from the back of the dome, isolating it from the cabinet interior and reducing the dome’s resonant frequency to below the crossover region. This eliminates the rearward output from the tweeter as a source of coloration. The result, according to LEAK, is a smooth, extended, and fatigue-free high-frequency presentation that integrates naturally with the Sandwich cone below it.

Crossover — Audiophile-Grade Components, Carefully Tuned

The two drivers are united by a 2.2kHz crossover developed through extended computer analysis and hundreds of hours of listening. It uses audiophile-grade polypropylene capacitors, air-core inductors, and low-loss resistorsarranged for minimal phase shift and signal loss. The stated priority is accurate time alignment between the two drivers, which preserves phase coherence and produces a stable, three-dimensional stereo image across a broad listening axis rather than only at the central sweet spot.

The Cabinet — Sandwich Construction, Inside and Out

LEAK applies the Sandwich principle to the cabinet walls as well as the driver cone. The enclosure uses a dual-layer construction: an outer skin of MDF bonded to an inner layer of high-density particle board, with the two materials’ different densities acting to scatter panel resonances rather than reinforcing them. A specialised adhesive filling bonds the layers and adds further resonance-damping properties. Internal bracing and acoustic damping material complete the package. The result is a cabinet that is well-controlled and adds minimal coloration to the sound produced by the drivers.

The enclosure uses a rear-firing bass-reflex port for controlled low-frequency extension. LEAK specifies bass extension to 44Hz at −6dB — a strong figure for a cabinet of this size. For best results, the speaker should have some clearance behind it to allow the port to function properly. At 340 × 210 × 250mm, the cabinet is genuinely compact for a standmount of this caliber.

Design and Finish

The Sandwich 100 is available in Walnut veneer — the only current finish at Audio Advisor. The walnut veneer is a furniture-grade wood-effect trim with aluminium driver trims and an aluminium insert around the edge of the front baffle. The front baffle itself is finished in soft-touch matt black rather than the walnut veneer used on the larger Sandwich 150 and 250 — a distinguishing design detail that gives the 100 its own identity within the family. A vintage-style acoustically transparent cloth grille is included and forms part of the speaker’s voicing, contributing to its balanced presentation.

The tweeters are offset from centre, and each speaker in the pair is a mirror image of the other — left and right are optimized separately. This asymmetric placement supports precise stereo imaging and helps with off-axis response consistency.

Who Built It and Why It Matters

Peter Comeau led the development of the Sandwich 100. In 1979 he co-founded Heybrook Hi-Fi, where he designed award-winning speakers. He has since overseen acoustic design across Wharfedale, Mission, and LEAK — three of the most respected British speaker brands. Working from IAG’s acoustic research centres in Huntingdon, England and Shenzhen, China, Comeau brings genuine decades of experience to a speaker at this price point. His stated goal for the Sandwich 100 was a sound that is “richly detailed, rhythmically confident and emotionally involving” across all musical genres.

What the Experts Say

What Hi-Fi? — Sandwich 100 Launch Coverage, April 2026
What Hi-Fi? covered the Sandwich 100 launch and described the 30mm tweeter as promising “open, finely detailed” high-frequency sound. They noted it as the most affordable and compact entry into LEAK’s Sandwich lineup, noting its competition at £449 with speakers like the Monitor Audio Bronze 50 7G — positioning the Sandwich 100 as a genuine high-value contender in the competitive standmount market at its price. Formal review pending.

Darko.Audio — Sandwich 100 Launch Coverage, April 2026
Darko.Audio confirmed the key engineering details of the Sandwich 100: the 2.2kHz crossover using polypropylene capacitors, air-core inductors, and low-loss resistors; the dual-layer MDF plus high-density particle board cabinet construction; and the soft-touch matt black front baffle that distinguishes it from the larger Sandwich siblings. They noted the 44Hz (−6dB) low-frequency extension and described it as a compact standmount positioned for “listeners whose rooms demand something smaller, whether on a desktop or in a more bijou listening space.”

Peter Comeau, LEAK Director of Acoustic Design — Product Statement, April 2026
Comeau described the Sandwich 100 as a speaker whose “modest footprint belies a performance that is richly detailed, rhythmically confident and emotionally involving.” He stated it “shines across all musical genres — from jazz trios and string quartets to rock, pop and electronica — delivering natural tone, believable scale and a level of transparency that draws the listener in.”

Building Your System Around the Sandwich 100

LEAK Stereo 130 Integrated Amplifier. The natural pairing LEAK recommends — a 45W Class AB integrated amplifier with a built-in phono stage, DAC, and Bluetooth. The Stereo 130’s power sits comfortably within the Sandwich 100’s 25–100W window, and the matching walnut finish and design language are deliberately coordinated. Browse Integrated Amplifiers.
LEAK Stereo 230 Integrated Amplifier. The step-up option in LEAK’s amplifier range, delivering more power and further refinement. Recommended for listeners who want more dynamic headroom from the Sandwich 100 or who listen at higher volumes. Browse Integrated Amplifiers.
LEAK TruStream Network Player. LEAK’s network streaming source, designed to pair with the Stereo 130 or 230 for a complete LEAK system. Handles streaming from services like Tidal, Qobuz, and Spotify, plus internet radio. Browse Music Streamers.
Speaker Stands. The Sandwich 100 is a standmount and requires stands to work at its best — the tweeter should be approximately at ear height when seated. Solid, well-damped stands make a real difference. Browse Speaker Stands.
Step Up: LEAK Sandwich 150. If your room is larger or you want more bass extension and scale, the Sandwich 150 uses the same Sandwich cone driver technology in a larger cabinet. It is a meaningfully bigger speaker, but the engineering philosophy is identical. Browse Speakers.

Features & Specifications

150mm Sandwich Cone Mid/Bass Driver — Rohacell Foam Core, Aluminium Skins

The heart of the Sandwich 100. Aerospace-grade Rohacell structural foam core bonded between aluminium skins with aerospace-grade adhesives. Exceptionally light, exceptionally rigid. Pushes resonance modes outside the audible band for pistonic motion across the full operating range. Long-throw motor system with high-gauss magnet and low-loss suspension maintains linear excursion at high volumes. Cone geometry shaped to reinforce stiffness and suppress breakup in the vocal and upper bass range.

30mm Coated Textile Dome Tweeter — Larger Than Category Norm

A larger-than-typical 30mm dome enables a lower crossover point for smoother driver integration and higher power handling in the critical upper-midrange region. Damped rear chamber absorbs rearward output, isolating the dome from the cabinet interior and reducing its resonant frequency below the crossover region. Delivers open, detailed, fatigue-free high frequencies that integrate naturally with the Sandwich cone.

2.2kHz Crossover — Audiophile-Grade Components

Polypropylene capacitors, air-core inductors, and low-loss resistors. Precision layout developed through extended computer analysis and hundreds of hours of listening trials. Accurate time alignment between drivers for phase coherence and stable stereo imaging across a broad listening axis, not just the central sweet spot.

Dual-Layer Cabinet Construction — Resonance Scattered, Not Reinforced

Outer MDF skin bonded to inner high-density particle board layer. Differing material densities scatter panel resonances rather than reinforcing them. Specialised adhesive filling adds further damping. Internal bracing and acoustic damping material. Rear-firing bass-reflex port provides controlled low-frequency extension to 44Hz (−6dB).

Mirror-Imaged Pair — Offset Tweeters for Optimised Imaging

Each speaker is optimised for its channel, with the tweeter offset from centre. Left and right speakers are mirror images of each other. Supports precise stereo imaging and consistent off-axis response throughout the room.

Walnut Veneer with Soft-Touch Matt Black Baffle

Furniture-grade walnut veneer on cabinet sides and top. Aluminium driver trims and aluminium insert around the front baffle edge. Soft-touch matt black front baffle distinguishes the Sandwich 100 from the walnut-fronted Sandwich 150 and 250. Acoustically transparent vintage-style cloth grille included, forms part of the speaker’s voicing.

Specifications

Type: 2-way bass-reflex standmount loudspeaker
Drive units: 1× 30mm coated textile dome tweeter; 1× 150mm Rohacell foam core / aluminium skin Sandwich cone mid/bass
Crossover frequency: 2.2 kHz
Crossover components: Polypropylene capacitors, air-core inductors, low-loss resistors
Frequency response: Not specified (±3dB)
Bass extension: 44 Hz (−6dB)
Sensitivity: 86 dB (2.83V / 1m)
Nominal impedance: 6Ω
Recommended amplifier power: 25–100W
Enclosure: Rear bass-reflex port
Cabinet construction: Dual-layer MDF outer / high-density particle board inner
Dimensions (H×W×D): 340 × 210 × 250mm (approx. 13.4” × 8.3” × 9.8”)
Finish: Walnut veneer, soft-touch matt black front baffle
Grille: Acoustically transparent cloth, included
Sold as: Pair (matched, mirror-imaged)
Designed by: Peter Comeau, LEAK Director of Acoustic Design

Frequently Asked Questions

What is a Sandwich cone and why does it matter?

A Sandwich cone is a speaker driver made by bonding a lightweight foam core between two rigid outer skins — in this case, aerospace-grade Rohacell foam between aluminium layers. A conventional single-material cone always faces a trade-off: stiffer means heavier, lighter means more prone to flexure and distortion. The Sandwich construction resolves this by using the foam for lightness and damping, and the aluminium skins for rigidity. The result is a diaphragm that moves as a single piston without breaking up within the audible frequency range, producing lower distortion, faster transient response, and a cleaner midrange. LEAK first used this principle in 1961 — the Sandwich 100 is the modern evolution of that original design.

Do these need stands? Can I use them on a shelf?

Stands are strongly recommended. As a standmount, the Sandwich 100 performs best when the tweeter is at or near ear height when you are seated. Placing them on a shelf will work but may compromise imaging and bass performance. If you intend to use them on a desktop or shelf, leave some space behind the cabinet for the rear-firing bass port to function properly. Call us for stand recommendations at your budget.

What amplifier should I use?

LEAK recommends 25–100W into 6 ohms. At 86dB sensitivity and 6 ohm nominal impedance, the Sandwich 100 is not a hard load to drive but it rewards quality amplification. LEAK’s own Stereo 130 (45W) and Stereo 230 are the natural system matches. A quality integrated amplifier from any reputable brand in the 40–100W range will work well. Avoid receivers at the very low end of their specified power if you listen at higher volumes.

How does the Sandwich 100 differ from the Sandwich 150?

The Sandwich 150 is a larger, heavier cabinet with a bigger mid/bass driver, designed for medium-to-large rooms. The Sandwich 100 is a more compact standmount aimed at smaller rooms, desktops, and listeners for whom the 150 is too large or too expensive. Both use the same Sandwich cone driver principle and the same 30mm tweeter design. The 150 will produce more bass and greater scale; the 100 is more practical for real-world smaller spaces. If you are unsure which suits your room, call us.

Can I use these without a subwoofer?

Yes, for most listening. The Sandwich 100 extends to 44Hz at −6dB — a strong result for a compact standmount, and sufficient for most music genres and casual listening. For home theater use, or if you want the deepest bass octave for organ, electronic music, or large orchestral material, a subwoofer will complement the Sandwich 100 well. They are not required for enjoyable stereo listening in typical rooms.

Is there a grille included?

Yes — an acoustically transparent vintage-style cloth grille is included with each speaker. LEAK notes that the grille forms part of the speaker’s voicing and contributes to its balanced presentation, so listening with the grille on or off may produce a slightly different result. Experiment to find your preference.

Are these sold as a pair or individually?

As a pair. The Sandwich 100 comes as a matched, mirror-imaged stereo pair — one speaker optimised for the left channel and one for the right, with the tweeters offset from centre in opposite directions for consistent stereo imaging. The SKU LESW100-WAL-PR covers both speakers.

What’s in the Box

LEAK Sandwich 100 loudspeakers ×2 (matched, mirror-imaged pair)
Acoustically transparent cloth grilles ×2
Documentation

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Curious about how speaker driver technology affects sound, or looking for guidance on building a compact hi-fi system? Visit our Audio Advisor Learning Center for guides on speaker placement, amplifier matching, and getting the most from a standmount system in real-world rooms.

Features

150mm Sandwich cone mid/bass driver — aerospace-grade Rohacell structural foam core bonded between aluminium skins. Extremely light, extremely rigid. Produces pistonic motion with low distortion, fast transient response, and clean midrange across the full operating range.
Long-throw motor system with high-gauss magnet and low-loss suspension — maintains linear excursion and controlled bass even at high volumes.
30mm coated textile dome tweeter — larger than typical designs at this price. Enables a lower crossover point for better driver integration and higher power handling in the upper midrange region.
Damped rear tweeter chamber — absorbs rearward dome output, isolating the tweeter from the cabinet interior and reducing its resonant frequency below the crossover point.
2.2kHz crossover with audiophile-grade components — polypropylene capacitors, air-core inductors, low-loss resistors. Precision layout for minimal phase shift and accurate time alignment between drivers.
Mirror-imaged pair — left and right speakers individually optimised, tweeters offset from centre. Supports precise stereo imaging and consistent off-axis response across the room.
Dual-layer cabinet construction — MDF outer skin bonded to high-density particle board inner layer. Differing densities scatter panel resonances. Internal bracing and acoustic damping material.
Rear bass-reflex port — controlled low-frequency extension to 44Hz (−6dB). Leave adequate clearance behind the speaker for the port to function properly.
Walnut veneer finish with aluminium driver trims and aluminium front baffle insert — furniture-grade appearance with classic mid-century British design references.
Soft-touch matt black front baffle — distinguishes the Sandwich 100 from the walnut-fronted Sandwich 150 and 250, giving the 100 its own identity within the LEAK family.
Acoustically transparent cloth grille included — forms part of the speaker’s voicing.
Designed by Peter Comeau, LEAK Director of Acoustic Design — one of Britain’s most experienced loudspeaker engineers.
The most compact and accessible model in the LEAK Sandwich series — suited to smaller rooms, desktops, and second systems.