Section 6- LS- 77 Technical Features

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

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Abbingdon Music Research LS-77 owner manual LS- 77 Technical Features