GR Research OB-5 Speakers (Pair) $1200
NO SHIPPING: Located in Central Massachusetts
Each OB-5 (Open Baffle) speaker features two 5-¼” mid-bass drivers and a Bohlender Graebener Neo3 PDR planar magnetic tweeter mounted in an open baffle covering the range from 200Hz and up.
Another pair of 5-¼” woofers are mounted in a ported enclosure below the open baffle section to cover the range below 200Hz and are tuned to reach a -3db down point in the 45Hz range.
Sensitivity rating is 91db with 1 watt/1 meter.
Impedance rating is 6 ohms with a minimum impedance of 4 ohms around the 4.5kHz range. They are fairly easy to drive and easy to get good output levels without tons of power.
Dimensions (inches): 53H x 8-3/4W x 16D (Bottom base is 12W x 18-1/2D)
Link to a ‘review’ and pics I posted at AudioCircle / GR Research Forum:
https://www.audiocircle.com/index.php?topic=127987.0
