The basic principle is simple: a tweeter with a 25mm self and a titanium diaphragm does not need the same energy as a 38cm speaker specialized in bass and subwoofer reproduction. This observation can lead us to amplify separately the famous 38 in order to obtain the desired deflections and the expected final result: impacts and whole notes not truncated below 40Hz.
The second point is that, physically, if we want serious that down to 20 Hz with a dynamic worthy of the name, we need a box that becomes monstrous by its dimensions. The amps we selected here incorporate a compensation to correct the signal sent to the speakers. This allows us to reduce this volume without compromising the range of the bass and its naturalness.