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X2.5 Owner’s Manual
The X2.5 is an ultra high quality linestage audio preamplifier
featuring remote control and internal power supply. It combines
a completely new circuit topology with traditional construction
representing thirty five years of preamplifier design.
This preamplifier flows from a commitment to create the best
sounding product: a simple circuit with the most natural sonic
characteristics. Derived from US Patent # 5,376,899, the X2.5
integrates power MOSFET and JFET devices in a simple Class A
topology in order to deliver the finest sound possible.
The Super-Symmetric gain circuitry is unique in providing superior
flexibility and performance with both balanced and unbalanced
inputs and outputs, converting one to the other as desired without
extra circuitry and without performance degradation.
The X2.5 minimizes the number of components in the signal path,
and yet retains exemplary objective performance specifications. It
pushes the edge of the art in exploring how much subjective quality
is obtainable with a new but very elementary gain stage.
The X2.5 employs a patented new type of volume control that
offers significantly better performance than seen before in an
electronic control. It provides over 60 dB of range, large voltage
swing and very good measured performance. The distortion and
noise is at 1/10 and the dynamic range 100 times the previous state
of the art in active attenuation. Most importantly it is subjectively
outstanding; better than any potentiometer we have evaluated.
The fluorescent display is a very special device. Not only will
you find its blue color highly attractive and readable, it is far more
reliable than the usual LED or LCD display.
Very few people are involved in the production of this product. I
supervise all phases of the construction, and I test each preamplifier
myself. If you have questions, comments, or problems, please feel
free to contact me directly.
Thank you for purchasing this preamplifier. It is my sincere hope
that you will enjoy its sound as much as I do.
Wayne Colburn
Vice President, Design
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