Product Guide

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Classic PRE Preamplier
Product Objecve
The Classic PRE is the latest update to a preamplier that has been part of the Cyrus product range for over a decade.
The objecve was to create a signicant step up in performance from previous versions by using everything that we
learnt when developing the fantasc XR Series, but retaining the familiar design of the Classic series. The circuit design
has been completely re-designed and the majority of the internal components have been upgraded by the Cyrus R&D
team, which has resulted in sound improvements that will help the Classic series retain a loyal fan base for years to
come.
Features and benets
Digital to analogue conversion
The digital input stage features the award-winning QXR DAC. Input
opons include 2 x coaxial digital and 2 x opcal digital inputs.
Balanced and unbalanced output opons
The unbalanced outputs are provided for close wired systems
where the power amplier is located close to the Classic Pre.
The balanced outputs are recommended for longer cable runs in
systems where the Classic Pre is driving power ampliers placed
close to the system speakers or acve speakers.
High capacity power supply
The Classic Pre power supply includes a 74VA toroidal power
transformer delivering power to a high capacity power supply
reserve. Within the circuit design, a total of 11 independent power
supply regulators regulate, then sub-regulate quiet power. Digital
control circuits are assigned a separate mains power supply,
completely isolated from the signal circuitry.
PSX-R port
The Classic Pre includes a port for the PSX-R power supply. Power
from the PSX-R is routed internally to the analogue stages of the
preamplier to provide a more stable, low-noise power supply for
the analogue preamp and post-DAC stages of the D/A converter.
Connecvity
4 x Analogue line level inputs
1 x Phono MM input for vinyl turntable
2 x Coaxial digital inputs via RCA phono
2 x Opcal digital inputs via Toslink
True balanced outputs via XLR connectors
Unbalanced outputs
Fixed/Recording output
Headphone output via 3.5mm jack
MC-BUS connecon (control integraon with Cyrus system)
PSX-R upgrade connecon
Firmware upgrade port
Analogue preamplier
The analogue preamp features relay input selecon for the ve
analogue inputs and a precision gain control for volume. The design
is intenonally wide bandwidth.
Phono MM input
The phono MM input stage design features dual acve gain stages
and passive RIAA equalisaon.