The ES30 has a fully symmetrical architecture, so two tightly coupled amplifiers are used, one driving the speaker+ terminal and one driving the speaker- terminal. A third amplifier provides a virtual ground. While this triples the cost, it relieves the circuit ground of carrying the speaker return currents, resulting in an extremely clean ground potential. We name this architecture: SYMTONE
The high quiescent current Class A design of the preamp and driver stages enables a core speed close to 1MHz, slowed down only by input and output filtering to match real word requirements. With filters in place, the small signal as well as full power bandwidth (!) measures an impressive 250 kHz. The lower frequency limit is around 0.3 Hz. No coupling capacitors are used throughout.
The ES30 monoblocks use a high bias Class A/B design that offers all the properties of a Class A design, while reducing power consumption and thermal stress on the electronic parts. This is done with a combined switch-mode pre-regulator and an analogue tracking post-regulator. The output voltage of this arrangement is the basis of all other supply voltages used in the amplifier. Because of its stability, the amplifier doubles the power when the load impedance is halved (perfect voltage source behavior).
High resolution audio is intrinsically tied to low noise and low distortion. System noise is the lower resolution limit of an analog system, because it determines the smallest signal not masked by a noise floor. Hence, low noise levels and thus a wide dynamic range are desirable. The A-weighted output noise measures less than 20µV.
Compact design; 260 x 210 x 400mm (W x H x D); various RAL colors available.
