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The  O-3

No longer available due to no more availability of the BG Neo 3 pdr with deep back cups.

The O-3 was designed to be the rear surround speakers for our OB-7 and OB-5 models. However, they are incredibly good for left and right main speakers and can even be used as a center channel.

As a rear surround speaker it creates a huge omni-directional sound field just as it was designed to.

As left or right mains it sounds more like the open baffle OB series speakers than a typical boxed speaker with front firing drivers. They sound huge but not exaggerated. Imaging is superb and much better than one would expect. They are not placement sensitive either. This is one of those must hear designs. The frequency response is very accurate on and off axis so overall room response is very consistent.

The O-3 is a true 3 way design with a 150Hz first order crossover between the front woofer and the back woofer. Both woofers are our highly regarded M-130's and the tweeter is the BG Neo3pdr.

By adjusting the capacitor bundle pulling the lows from the front woofer you can vary how much the front woofer is allowed to overlap onto the rear woofer varying the output level of the low end and easily compensating for room gain of small rooms or large rooms. This flexibility allows complete adjust-ability for any room.

The height can easily be adjusted to allow them to be used as a center channel speaker in front of a flat screen TV or front projector. Adjusting the height and the internal air space will slightly alter the low end extension. With its current height and air space it is -3db down at 50Hz due to its rear porting.

The small and narrow profile gets high approvals from significant others too. The size is only 7"wide by 13.5" deep by 36" tall, plus the base and floor spikes.

The kit comes complete with everything you'll need minus tools or wood. The kit comes with Erse XQ inductors and Sonicaps, Erse Pulse X poly caps in the woofer circuit with Sonicap Gen.2 by-pass caps. Even the little things like heat shrink, screws, solder, etc are all included. It even comes with large Brass floor spikes. No Rez damping material is not included in this price. Two sheets are recommended.

We now offer the new patent pending Electra Tube Connectors as the standard speaker wire connectors for all of our upper level kits as they are superior to all current binding posts. These have a $59 a set retail value. The standard internal wire is a high purity solid core 16 gauge with a polyethylene jacket.


O-3 Specifications

  • 3-way bass reflex design
  • Simple parallel network
  • BG Neo3pdr tweeter
  • 2 M-130 5.25 inch composite paper woofer with phase plug type dust cap, polymer chassis, and vented Kapton voice coil
  • Frequency response is better than +/-2dB at 20 degrees off axis.
  • -3dB is 50Hz
  • Sensitivity is 86 dB (1watt/1m)
  • Recommended amplification is 8-100 watts RMS
  • Impedance 6 ohms nominal with a 4.5 ohm minimal dip
  • Dimensions: 36 " h (plus base and floor spikes) x 7" w x 13.5" d.

Prices are per pair. Click here for enclosure plans.


Your Price: $729.00
Item Number: O-3
Manufacturer: GR Research
Manufacturer Part No: O-3


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