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.

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.

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.

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.