AMR LS-77

Name: AMR LS-77
Brand: Abbingdon Music Research

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Overview

Withextraordinarybassandtreble,combinedwithanelegantlookanddynamicsoundstage,theLS-77speakersnotonlypackamusicalpunchbutanemotionalonetoo.

Key Features

Defining characteristics

AMR LS-77

Full Frequency Range Design®
After 3 years of research and development, the LS-77 is based on AMR’s in-house developed Full Frequency Range Design (FFRD). FFRD truly extends the low frequency extension down to 26Hz and the treble response up to 40kHz, which is previously unimaginable in a 2-way bookshelf speaker design.
OptiSlope®
The OptiSlope is a unique and highly specifically crossover developed by AMR’s in-house filter calculation and optimisation software. Compared to 1st Order Filters commonly found in many high-end speakers, the OptiSlope cuts the interference between the drivers by 93%.
OptiPort®
LS-77’s OptiPort design, made from solid Magnesium Aluminium alloy, completely eliminates the usual shortcomings of (i) traditional reflex port designs, which cannot be tuned sufficiently low to extend the bass response and (ii) transmission line designs, where the resonances of the transmission line structure will unavoidably muddle the upper bass frequencies.
OptiAdjust®
For every speaker and crossover design, there will be a single spot in the listen room which the speaker sounds the best. In order to provide a much wider optimum listening area, both the LS-77’s high and low frequency can be fully adjusted from one extreme to another: close to walls vs. free field placement, small room vs. large lounge etc. Above and beyond the role.
OptiArray® Expandability
The LS-77 forms the foundation of AMR's OptiArray® scalable loudspeaker system, allowing multiple configurations for larger acoustic environments.
OptiGuide®
The unique LS-77 OptiGuide is an unique design using curvilinear cast Magnesium Aluminium alloy waveguide. The OptiGuide equalises the difference between on and off axis response by mechanical means. It focuses all the sound across an identical radiation pattern for the widest range of frequencies and also matches up with the off-axis response of the low frequency driver. As a result, LS-77 may use its OptiSlope crossover to linearise the high frequency response for both on and off axis and reach a performance which before could only be achieved by dedicated super-tweeters.
Premium Components
All premium components used were chosen after extensive evaluation, lengthy and comprehensive listening tests. These include all air-coil copper foil inductors, German metal foil crossover capacitors and FEP Teflon insulated cable with silver-plate conductors for all internal wiring.

Full Frequency Range Design®

Music that feels live.

Music is vivacious, vibrant and real – making you feel you're at a live event, and all the wonderful emotions that go with it.

Craftsmanship

Full Frequency Range Design®. Built for reference listening.

The LS-77 combines transmission-line loading, an isoplanar ribbon high-frequency driver, and a purpose-developed low-frequency system within a rigid aluminium cabinet - engineered to reveal detail, imaging, and tonal balance with professional-monitor precision.

FFRD®Transmission-LineRibbon HFOptiArray®

Technical Excellence

Reference-class monitoring. Full-range authority.

Designed around AMR's Full Frequency Range Design® philosophy, the LS-77 extends from 26Hz to 40kHz with transmission-line bass loading, a 234mm low-frequency driver, and a 5-inch isoplanar ribbon tweeter.

26Hz

Low Frequency Extension

40kHz

High Frequency Extension

150W

Continuous Power Handling

35kg

Weight per Speaker