Acoustic Research 266HO
A floorstanding speaker system with dual 6.5-inch woofers and a soft dome tweeter, designed for clear high-frequency response.
Overview
The Acoustic Research 266HO is a tall boy type floorstanding speaker system produced by Acoustic Research. It features a 2-way, 3-speaker bass reflex design with an anti-magnetic enclosure. The system uses two long-throw 16.5 cm cone woofers and a 2.5 cm dome tweeter, with an energy control contour around the Aeroform Tweeter derived from higher-end models for improved high-frequency clarity. Available in black and maple finishes, it includes gold-plated terminals compatible with banana plugs.
Specifications
| Design | 2-Way, 3-Speaker, Bass Reflex System, Tall Boy Type, Anti-magnetic Design |
| Drivers | Low frequency: 16.5 cm cone x2, High frequency: 2.5 cm dome type |
| Frequency response | 36 Hz to 20 kHz ± 2 dB |
| Sensitivity | 93dB/2.83V/m |
| Impedance | 8 Ω |
| Recommended amplifier power | 20W ~ 150W (RMS) |
| Crossover frequencies | 900 Hz, 3.5 kHz |
| Dimensions (W x H x D) | 223 x 838 x 381 mm |
| Weight | 18kg |
| Finish options | Black and Maple |
Design
The 266HO uses a bass reflex enclosure with two long-throw 16.5 cm cone woofers and a 2.5 cm soft dome tweeter. It incorporates an energy control contour around the Aeroform Tweeter, a feature inherited from Acoustic Research's high-end models, to enhance high-frequency clarity. The anti-magnetic design allows safe placement near video displays, and the gold-plated terminals support banana plug connections. The system is biampable, enabling separate amplification for low and high-frequency drivers.
Context
Part of the HO series of tall boy speakers, the 266HO shares technology—specifically the energy control contour—with higher-end Acoustic Research models, positioning it as a performance-oriented floorstanding speaker within the brand’s lineup.
Market
A used pair was listed for sale at 250€, indicating active secondary market interest. HifiShark monitors pricing and availability for used units, reflecting ongoing collector and audiophile engagement.
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Service Manuals, Schematics & Catalogs
- Catalog — archive.org
- Catalog (1968) — archive.org