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Ohm B

Production Period
early 1970s
Nationally Advertised Price
$500 per pair
Amplifiers Recommended
25 - 100W
Impedance (typical)
Frequency Response
32 - 20,000 Hz (+/-3dB)
Sensitivity @2.8 Volts
86 dB
Recommended Room Sizes
1600 - 4800 cu.ft.
Purchase OptionsPriceOrder

The woofer is generally the largest driver in the system which covers the bass and mid-range frequency. This includes the Sub Bass Activator.

$345 2

The high tweeter is generally the smallest driver in the system which covers the highest frequencies.


The grill is the cloth and frame used to cosmetically conceal the drivers without affecting the sound. Ohm now uses black grills in almost all cases. In the past, brown and brown/black mixes were used; but every ”brown” turned out differently. Now they are all black (except on some current white speakers, we have white as an option).

Crossover service

The crossover is the electrical circuit that protects the tweeters from the low frequency energy that is reproduced by the main drivers. This can only fail, in rare instances, from overdriving the speakers.

$179 3
(1) With the return of the original part for recycling within 60 days.
(2) With the return of the original part for recycling before the shipment of the new part.
(3) Recycled repaired and tested.
(4) Per pair.
(5) Special shipping rate applies.

The Ohm B was the very first speaker shipped by Ohm in 1971. It was a very large bookshelf (the exact size of the then popular AR-3a) speaker. It was a 2-way system with a 12” woofer and 1” dome tweeter. The 2-way systems with large woofers were later popularized by the Advent Loudspeaker.

The upgrade option available for the OHM B is a new pair of poly-cone woofers, which includes a SubBass Activator, which eliminates the drive below the speaker's natural response to reduce distortion and clean up the deep bass. This allows for lower distortion, higher output and deeper bass, plus uses a self-resetting protection circuit.

Note: Most Ohm upgrades require no specialized knowledge and are easily completed completed by any person. It takes less time to install your own upgrade than it does to package and return ship your speakers to the factory, therefore, we recommend you save time and money by doing this yourself. We ship the upgrade to your door with clear, easy instructions. If for any reason you prefer to have the factory complete your upgrade installation, we will be happy to do this for free, however, you will be responsible for shipping and handling costs each way.

Ohm allows up to $500 for the return of a complete pair of undamaged Ohm B's toward 25% of the purchase price of new Ohm speakers.

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