ESX continues to demonstrate that it is a specialist in the design and manufacture of Class D amplification. The QS-TWO-BT not only stands out for its ultra-compact size, what is most surprising is that despite its dimensions (90 x 35 x 70 mm) it passes with flying colors in any test related to performance, sound quality and low distortion levels (>0.007% THD+N at 5W), offering a power of 52 watts RMS per channel at 4 ohms and a not inconsiderable 95 watts per channel at 2 ohms. It can even be bridged, delivering 190 watts. Another of its advantages is that it has a Bluetooth 5.0 receiver, very energy-efficient as it minimizes battery consumption; and it also allows you to easily add a small self-amplified subwoofer to the preamp outputs or do without a main unit and play directly via Bluetooth Audio. It also features a small electronic circuit that prevents the original amplifier’s output from being underloaded (Error Protection System), very useful as it prevents the original unit from playing if it doesn’t detect the resistive load of the OEM speaker coil.
