This group of speakers - the AR -28b, -18b, and 8b - exemplify a fundamental belief we have held through nearly three decades of acoustic research. Listeners whose system options are highly restricted by budgetary considerations need not be deprived of true quality sound. These B-series acoustic suspension speakers use long throw woofers with energy absorbent diaphragms damped to an extremely low Q. the bass stays tight and clean, even at 100 watts of power on the 28b and 18 b, and 75 watts on the 8b. For added protection during peak power surges, the 1-1/4-inch high range drivers are cooled with magnetic fluid and fitted with S-Shaped lead outs.
A special feature of the 28b is a new 8-inch woofer that produces remarkably smooth frequency response in the mid-range, the critical aera for vocal reproduction.
Acoustic Research proudly presents three types of loudspeaker systems and one great sound.
AR-28B Specifications
System Type: Bookshelf acoustic suspension, 2-way system with drive units in vertical array
Drive Units:
LF : 200 mm (8") long-throw acoustic suspension woofer
HF : 32 mm (1-1/4") liquid cooled cone high range driver
Voltage Sensitivity: 2,83 watts produces 88 dB SPL at 1 meter on axis
Efficiency: 1 watt produces 88 dB SPL a 1 meter on axis
Power Requirement: 10 watts per channel minimum
Power Handling Ability: maybe used with amplifiers rated at up to 100 watts per channel
System Frequency Response: -3 dB (half power) points at 52 Hz and at 22,000 Hz
System Low Frequency Performance: -3 dB at 52 Hz with an effective Q at resonance of 10
Impedance: 8 Ω nominal
Crossover Network: Woofer has a 12 dB/octave mechanical crossover. High range has a first order electrical network plus mechanical slope to give a total of 18 dB/octave
Crossover Frequency: 2,000 Hz
Cabinet Internal Volume: 14,75 litres (52 cu.ft)
Cabinet Dimensions (W x H x D): 279 x 508 x 184 mm (11" x 20" x 7-1/4")
Cabinet Finish: Walnut or oak grain vinyl veneer
Weight: 8,6 kg (19 lbs) 1 speaker; 19,2 kg (42,3 lbs) 2 speakers packed in carton (shipping)
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