8
XP-22_om_prelim
With balanced operation, the common mode rejection of the
preamp reflects the intrinsic common mode rejection of the
topology, the matching of the gain devices, and the matching of
the attenuator channels. In this case we have been able to keep
the total mismatch to about .1%, for a common mode rejection of
approximately -60 dB.
The input system of the preamplifier will exhibit full common
mode noise rejection with passive balanced sources, where the
negative input is connected to ground at the source through
the appropriate source impedance. This allows adaptation of
unbalanced sources to balanced operation with passive cable
connections in a manner that achieves the noise rejection of active
balanced sources.
The use of a micro-controller allows all of the preamplifier functions
to be repeatable and accurately controlled. The micro processor
only controls the functions of the preamplifier. At no 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 isolated 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.
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 and offer
protection to the power-amplifier and loudspeakers.
XP-22 Specs:
Power consumption
40 watts
Gain
9.6dB
Balanced
Output Impedance:
25 Ohms RCA, 50 Ohms XLR
Input Impedance:
22K Ohms
Frequency response:
+/- 0.05 dB 10Hz to 20KHz
-2dB
@
150KHz
Crosstalk
> 100dB
THD
< 0.001 @ 1V 1Khz
Max out
33V RMS 0.1%
Residual Noise
2uV RMS, SN -125dB ref max out
Dimensions:
17”w x 12.5”d x 4”h times two
Weight:
