- Production Period
- early 1970's
- Nationally Advertised Price
- $400 per pair
- Amplifiers Recommended
- 15 - 75W
- Impedance (typical)
- Frequency Response
- 47 - 17,000 Hz (+/-3dB)
- Sensitivity @2.8 Volts
- 87 dB
- Recommended Room Sizes
- up to 2640 cu.ft.
The woofer is generally the largest driver in the system which covers the bass and mid-range frequency.
The SubBass Activator is an electrical circuit which extends the deepest bass when the music calls for it, reduces the distortion for cleaner sound, increases the dynamic range for greater impact, and uses a self-resetting protection circuit to reduce the chance of damaging the speakers.
The low tweeter is generally the midsize driver in the system which covers the upper mid-range and low treble
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).
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.
(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.
The D used a 10” woofer in a cabinet with a resistive vent (AKA aperiodic) and the low tweeter from the C+. The D was known for its great “rock & roll” bass.
The OHM D can be upgraded to the sound quality of an OHM C2 with the addition of a dome tweeter and crossover harness. The upper treble response is extended to add sheen to cymbals and metallic quality to horns. To install this kit you must first cut a hole in the front panel (a template is provided) and then put in the crossover harness.
Both the C2 and the D2 can have tighter and deeper bass with the addition of a SubBass Activator (SBA) and our upgraded 10" woofer. The SBA 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. The upgraded woofers have a new cone/surround that is projected to last up to 30 years, while the FerroFluid cooling handles the thermo transients from CD's.
Another option available is the vent which allows for 1/3 octave deeper bass and also doubles the maximum sound pressure level in the bass. For installation you must cut a 2" circular hole (a template is provided) and then glue the new vent in.
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 $400 for the return of a complete pair of undamaged Ohm D's toward the purchase price of new Ohm speakers.