8
X2.5 Owner’s Manual
time does any of the input or output signal come into contact with
the digital control signals. The digital circuits are powered by a
power supply that is completely separate from the analog supply.
Should it ever be necessary to update the software that controls the
functioning of the preamp only the socketed micro processor need
be changed.
The power supply for the X2.5 consists of a toroidal power
transformer delivering an unreg/- 45 volts which is actively
regulated before feeding passive filtering and powering the constant
current sources which bias the gain stages. Each channel has it’s
own regulation. The power supply noise reaching the circuit is on
the order of one microvolt, and the little of that which get through
the circuit is rejected at the output in a balanced system. The relays
and control systems are regulated independently, and all digital
circuitry is isolated from the power supply.
Muting relays, which delay connection during turn-on and shut off
the output when insufficient power supply is available to maintain
regulation, guard the output of the preamplifier. The preamplifier
is designed to run constantly, and will exhibit optimum measured
performance within about 10 hours of turn-on.
The X2.5 consists of a single chassis.
For more information please contact:
Pass Laboratories Inc.
P.O. Box 219,
24449 Foresthill Rd.,
Foresthill, CA 95631
Tel: 530.367.3690
Fax: 530.369.2193
www.passlabs.com
© 2006 Pass Laboratories Inc.
