The input signals are switched using mechanical relays (the best signal separation and transparency) located in the immediate vicinity of RCA sockets. This helps avoiding using signals wires susceptible to interference go to the selector on the front panel. The selector on the front panel is only used to control audio-independent microcontrollers that re-activate the appropriate relays, allowing to choose the source that interests you.
In the phono preamplifier section with RIAA feedback, we use the OPA2111 dual operational amplifier. It provides high precision midrange and treble, as well as fast and deep bass. The integrated circuit is not soldered to the electronics board and placed in a dedicated stand, which enables the user to exchange it himself and thus interfere with the sound. There are many alternatives available, eg TL072, NE5532, OPA2604 and many more. Each model has a slightly different sound character.
The power supply of the phono preamplifier is fully symmetrical (the best work culture and system stability), filtered by passive elements and additionally stabilized by electronic circuits ensuring the suppression of the hum to the absolute minimum. The large capacity of the power supply capacitors additionally contribute to the preamplifier being characterized by the best properties of the work, which also directly affects the sound.
As an additional option, it is possible to select the Burson Audio Supreme system in configurator. It is the equivalent of an operational amplifier used in Phoenix, built on discrete elements, i.e. basic electronic elements. Detailed information on Burson Audio systems can be found on the manufacturer’s website at: https://www.bursonaudio.com/
The Phoenix source selector can be configured according to your own needs using the configurator above. It can also be adapted to support symmetrical signals (eg 2 x XLR Stereo) or mixed signals (eg 1 x XLR Stereo + 2 x RCA stereo). There is also a choice of more outputs and their type (RCA, XLR or XLR + RCA). In addition, the Phoenix model does not have to be equipped with a phono preamplifier so many practical configurations are possible.