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Ohm CAM/PRO-42

Production Period
mid 1990s
Nationally Advertised Price
$850 per pair
Amplifiers Recommended
30 - 150W
Impedance (typical)
Frequency Response
32 - 20,000 Hz (+/-3dB)
Sensitivity @2.8 Volts
89 dB
Recommended Room Sizes
up to 2800 cu.ft.
Original Coherent Audio Monitor Owner
Download 1 MB
Pro Monitors Specification Sheet
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CAM 16 Review New York Times
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CAM 16 Stereo Review
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CAM 32 Review The Sound
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How to Demonstrate Coherent Audio Monitors
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Coherent Audio Monitors
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Purchase OptionsPriceOrder

The 8” poly-cone woofer has a foam surround which decays after about 20 years. We replace it with a new one which is projected to last up to 30 years. The original Ohm woofer eliminated certain problems by eliminating the dust cap. Instead, we used a felt washer to protect the moving parts from dust and debris.

$125 1
Egg Tweeter

The removable egg tweeter on the top of the cabinet pivots to allow you to adjust the balance of the system. They should cross fire in front of your head.


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).

We make replacement grills by hand to order, out of acoustically transparent sheet metal, which is much stronger than the original vacuum molded plastic.

$270 4
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.

Passive Radiator

The passive radiator looks like a large woofer from the outside. It produces the deepest octave of sound and has no magnet or motor assembly. The air inside the cabinet acts like a spring with the woofer driving one end and the passive radiator (PR) at the other. At the low frequency where the spring and the PR resonate, extra energy comes out of the system. Typically, the foam edge deteriorates within 20 years. We now use a new foam edge that is projected to last up to 30 years.

$145 2
(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 CAM and PRO 42 used an 8” woofer and 12” Passive Radiator in a large bookshelf speaker to produce super deep bass. They also used Ohm’s unique EggTweeter (ET) to optimize the stereo image and ”open up” the treble and mid-range.

The upgrade option available for the OHM CAM and PRO-42's is the addition of the SubBass Activator, which eliminates the drive below the speakers 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 $850 for the return of your complete undamaged pair of CAM/PRO 42's toward 25% of the purchase price of new Ohm speakers.

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