Here is the procedure for re-calibrating your Pro Linear speakers, there is no actual hard reset. It does not require a computer, however, it does require a source of constant sound, either white or pink noise, or sine wave.

The ProLinear DSP has an extremely useful feature called Input Level mode that can help you optimize the speaker's performance. This mode allows you to measure the level of the incoming signal, which in turn makes it possible to adjust the rear panel Input Level control to its ideal position. In addition to allowing you to achieve maximum signal integrity for an individual speaker, Input Level mode can also be used:
1. To be certain that all ProLinear DSP speakers in the system are at the same level, and
2. To be certain all speakers are operating at an optimal signal-to-noise ratio (SNR).
To optimize your setup, you need to send a constant, steady signal to the ProLinear DSP speaker. Most audio engineers would send the unit pink noise, white noise or a sine wave. We recommend that you purchase a reference CD containing these and other signals commonly used for level calibration. It's very difficult to calibrate any professional audio device using regular music or program material.

To use Input Level mode:
Starting from within Program mode, press and hold the Page button for three seconds. The display should read -94dB in, Or something close to that.
Once this display is showing, reach around to the back of the ProLinear DSP and set the Input Level control to its minimum position.
Select a test tone that has a level very close to 0dB on the CD player and send it to the speaker.
Slowly increase the Input Level control until the display reads -10dB.
 
To exit Input Level mode, hit the Page button again.