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Ohm PRO-200

Production Period
late 1980s
Nationally Advertised Price
$895 per pair
Amplifiers Recommended
30 - 200W
Impedance (typical)
Frequency Response
Sensitivity @2.8 Volts
89 dB
Recommended Room Sizes
up to 1800 cu.ft.
Pre-Release PRO Sound Cylinder Spec Sheet
Download 609 kB
Original PRO Sound Cylinder Spec Sheet
Download 870 kB
Purchase OptionsPriceOrder
Low Repair

If there is very little sound and it is scratchy, buzzy, or it rattles in the low frequency range, then a low repair is necessary. We must receive both speakers from you so that we can match them both to the good one.

High Repair

When the system is very dull sounding but most of the sound is acceptable, it usually indicates that a high repair is necessary. Sometimes this is only noticed when one speaker is compared to another. We must receive both of your drivers so that we can match them both to the good one.

Can Grill

This is the perforated metal can covering the Walsh driver. It only needs to be replaced when it is dented or mechanically damaged. This option may only be purchased when the cans are being installed at the factory.

Driver Board

The black plastic band between the grill and the main cabinet holds the driver. If the speaker is knocked over it is possible to break the internal part of the plastic driver board. If the break is minor, buzzes will be heard on certain notes. If substantial damage is done, the whole speaker will rattle when laid on its side. We’ve run out of the original parts and the vendor who molded them for us is out of business. We make the replacement parts out of wood by hand here in Brooklyn New York. Once they’re installed on the speaker, you can hardly tell the difference. The new board needs to be installed at the factory. We recommend, but don’t require, that the work be done in pairs.

Plastic Base

The plastic base of the sound cylinders holds the input terminals and vent as part of the assembly. On some models, there are also electrical components on the inside of the base. Even with a broken leg, if the cabinet seal is intact, there should be no effect on the sound. The terminals cannot be replaced without the base being replaced.

2000 Upgrade / pair

The PRO-200.2000 upgrade uses the same technology as the current Walsh 2000. The result is more even dispersion, higher output, and more detailed voices. The range is also extended in both directions. This upgrade is for 1300-3000 cubic foot rooms and must be done at the factory.

$1,900 4
3000 Upgrade / pair

The PRO-200.3000 upgrade uses the same technology as the current Walsh 3000. The result is more even dispersion, substantially more output, and more detailed voices. The range is also extended in both directions. This upgrade is for 2400-5400 cubic foot rooms, and must be done at the factory.

$2,700 4
(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 Sound Cylinder Series was the best value Walsh speakers made by Ohm. The cabinets used the inherent structural strength of a round cylinder. The 1/4” fiber wall was more rigid than the 3/4” MDF walls of good cabinets. Lead sheets were used to damp the few cabinet resonances and the drivers were all pure second generation Walsh technology. We used an inverted full range driver with a super-tweeter to extend the high frequency response. Each model had different super-tweeters and different sized cabinets to achieve different treble and bass extension, yet the critical mid-bass to mid-treble is the same on all models.

The PRO Series were in black and the SC Series in dark oak. The peak music power rating was the model number for the PRO series. The SC series were each 2” shorter and had a 25 watt lower rating:


They all produced Full Room Stereo, when a firm precise stereo image is heard from a wide Sweet-Sweep instead of a narrow Sweet-Spot.

The driver can be upgraded to the new Walsh 100 Mk-2 which allows for the bass to be extended down and the treble to have wider dispersion. The upgrade comes with a 3 Year Limited Parts & Labor Warranty, assuring you years of pleasure.

  • This upgrade MUST be done at the factory.
  • You are responsible for shipping to the factory.
  • Return shipping is a flat $50 and charged at the time of purchase.
  • Please call 800-783-1553 for packaging & shipping recommendations.

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 $895 for the return of a complete undamaged pair of Ohm s toward 25% of the purchase price of new Ohm speakers.

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