Linn 2250, Owner'S Manual

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Introduction
Linn 2250
The Linn 2250 is a high power two-channel amplifier designed for use in multi-
amplifier audio and video systems. It exemplifies Linn’s unremitting commitment to
exploiting the latest technology in order to produce ever better sounding products.
The unit’s features include Linn’s switch mode power supply (see below), automatic
signal sensing, bi-wireable speaker outputs and the option to add a stereo Aktiv card
for improved audio performance.
Switch mode power supply
The power supply in most amplifiers contains a large and heavy transformer, a
rectifier and reservoir capacitors. These components convert the voltage of the mains
supply to the low voltage required by electronic circuits, and supply this lower
voltage to the amplifier circuitry at a constant level – regardless of the demands of
the amplifier. Such power supplies use electricity inefficiently and cause mains power
distortion which can lead to electrical and acoustic noise.
In a switch mode power supply, the incoming mains voltage is chopped up by very
fast semiconductor switches and is then passed through a small transformer and
other components, which convert the voltage to the value needed by the amplifier
circuitry. By controlling the timing of the semiconductor switches, the voltage
supplied to the amplifier circuitry can be instantly altered to suit demand. Linn’s
switch mode power supply is not only efficient, it also eliminates mains power
distortion resulting in superior performance and sound quality.
Aktiv cards
The Linn 2250 power amplifier has been engineered to support both passive and
active loudspeaker crossovers. In a passive crossover the audio signal from a system’s
amplifier is split by circuitry inside the loudspeaker into bass and treble, or bass, mid
and treble (depending on the type and size of loudspeaker). With a passive system a
portion of the energy in the audio signal is required to power the crossover, which
naturally has an affect on the overall quality of sound reproduction. The benefit of an
active system is that the audio signal is split within the amplifier and each split
‘segment’ is further amplified before being fed to the speakers. Active crossover
systems sound more dynamic than passive systems as the speakers are provided with
more energy to drive them.
Linn have developed active crossovers, called Aktiv cards, which have been optimised
for our range of loudspeakers. Once fitted, Aktiv cards can be fine-tuned to suit the
requirements of your room and enhance your listening experience. Aktiv cards can be
fitted into your Linn 2250 power amplifier by your local Linn specialist retailer.
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