The OHM L upgraded woofer kits offer smoother transition to the low tweeter and use a new foam surround that is projected to last up to 30 years that will allow for more clarity on female voices. The FerroFluid cooling handles the thermo transients from CDs.

Tighter and deeper bass is heard with the addition of a SubBass Activator (SBA) and vent adapter. The SBA eliminates the drive below the speaker's natural response to reduce distortion and clean up the deep bass. The vent adapter tunes the cabinet to work with the SBA and new woofers for deeper bass response.

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 $495 for the return of a complete pair of undamaged Ohm L's toward 25% of the purchase price of new Ohm speakers.