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The following section provides a brief explanation of the most salient technical features of the LS-77.
10” High Performance Low Frequency Driver - a unique design provides unparalleled low frequency
extension in a compact speaker, combined with the midrange performance only available from large dome
midrange drivers while minimising distortion and thermal compression.
5” Isoplanar Ribbon High Frequency Driver - AMR’s use of a customised Isoplanar ribbon provides the
smooth and clean treble associated with ribbon and electrostatic designs through a fusion of principles, yet with
a design that matches and outperforms traditional dynamic high frequency drivers in terms of SPL capability and
low distortion.
1” to 3/8” (25mm - 10mm) Solid Aluminum Enclosure - AMR’s use of solid aluminium as enclosure
material is driven by the simple fact that aluminium is eight to ten times as stiff as the materials conventionally
used. Thus an enclosure using aluminium has much lower colorations than one using conventional materials.
TransmissionLine Port Low Frequency Loading - AMR’s acoustic load combines the ability of
transmissionline speakers to play very low notes loud and cleanly with the more compact dimension of traditional
box designs by synthesising a new enclosure type from the best features of both.
OptiSlope® 10th Order Crossover - AMR’s unique crossover minimises any interference between low and
high frequency drivers to ensures an even on- and off-axis frequency response. The crossover is hardwired
using air core copperfoil inductors; highest quality custom and german made film and tinfoil/film capacitors. It is
then encapsulated in a viscoelastic compound to eliminate the influence of vibration on its operation.
OptiImage® - allows exceptional stereo imaging as a result of controlled directivity that reduces the amount of
unwanted reflection and acoustic reverb in the listening room.
OptiArray® - allows the LS-77 to form larger arrays with fundamentally identical performance, coherence and
imaging to the single LS-77 yet with the directivity and SPL capability to fill even the largest rooms with ease.
For a more detailed explanation of these and other features, please go to: www.amr-audio.co.uk
Section 6 - LS- 77 Technical Features