Pass Laboratories XP-30, Руководство пользователя

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Description
The XP-30 is a modular preamplifier consisting of one control / power supply chassis
and additional gain chassis, each containing the analog circuits of a single channel.
The XP-30 is meant to typically be used as a two-channel product, but you can use
the control chassis to serve up to six channels.
Each channel individually provides master and slave outputs. The relative level
between the master and slave outputs of each channel is adjustable by a knob on
the front panel of each individual gain chassis. If you have ever wanted to bi-amp
your loudspeakers, you might appreciate that this feature allows easy use of
different types of amplifiers for the low vs the high frequencies, adjusting the relative
levels as needed. If you need big power and control on the bottom but want the
sweet character of tubes on the top, you may wonder how you ever got along
without this. Or why other companies don't offer it.
It is even useful when the same types of amplifiers are used – typically without the
full load on each amplifier the subjective balance still needs minor tweaking.
All connected gain chassis respond to the master level adjustment on the main
control chassis through a completely new volume control covering a range of 100 dB
in precise 1 dB steps.
Both outputs of each channel are offered as single-ended and balanced outputs
having the same gain and impedance and both may be used simultaneously with no
degradation.
There are five (5) regular inputs, a special home theater bypass input and tape input
for those needing any side loops for recording or signal processing.
The control chassis also supports a mono function between the separate different
analog stage chassis.
The power supply in the control chassis is large enough for somebody else's power
amplifier. It contains a pair of highly efficient, low-noise Plitron transformers in dual
mono topologies, emi filtering, large capacitance reservoirs, and of course the
isolation that comes with being in a different chassis from the analog gain stages.
Something else that was on Nelson's wish list – the ability to drive an amplifier
output stage by itself: Do you require a preamplifier deliver a fraction of a volt to the
power amplifier or peaks in excess of 50 volts to a balanced no-feedback follower
output stage?
The XP-30 is fully capable of both tasks at once. The internal gain of each stage
can be boosted another 16 dB via an internal jumper and the preamp can serve as
the low source impedance front end to the new generation of Class A power
followers. Don't laugh – they already are for sale, and there are more coming your
way. If you have an XP-30 you won't have to buy a new preamp...