Acoustic Research
AR-3a
Introduced 1967$500 MSRP
Iconic acoustic-suspension 3-way with pioneering dome midrange and tweeter, a reference standard of the late 1960s. Most surviving pairs need woofer refoaming and pot cleaning.
MSRP
$500
Used market · Good
$1,100
+120% vs MSRP
as of Aug 15, 2026MSRP to used market
From $500 at launch to $1,100 today.
Specifications
- Type
- 3-way acoustic suspension
- Drivers
- 12-inch woofer, 1.5-inch dome midrange, 0.75-inch dome tweeter
- Weight
- 53 lbs
- Dimensions
- 25 x 14 x 11.5"
- Impedance
- 4 Ω
- Sensitivity
- 86 dB
- Power handling
- 100 W
- Frequency response
- 35 Hz - 20 kHz
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