HPD models employ digital amplification modules based on an improved version of Pulse Width Modulation technology. Thanks to the high efficiency of the power section and to the switching power supplies, we've been able to keep the weight of these amplifiers low to facilitate transportation and set up. The protection system includes thermal protection, short circuit protection, high frequency protection and a CLIP LIMITER circuit. Several user configurations can be selected in the input section (STEREO/BRIDGE/PARALLEL) as well as several filtering options (FLAT/BI-AMP/HPF).