Classik-K Product Description
Tuner
The tuner uses a module that is pre-aligned at the factory – do not change the setting
of any of the adjustable devices on the Tuner module. The Tuner module deals with
both AM & FM signals. A tuning voltage is applied to the input of the module and this
relates to the incoming RF frequency - as the tuning voltage increases, so does the
tuned frequency. Control lines for Signal strength output level & AM-mute, as well as
FM stereo logic signals are present on the Tuner module.
The I
2
C controlled PLL synthesiser monitors the local oscillator frequency for the AM
& FM signals and then adjusts the tuning voltage up or down, depending on the
frequency desired by the user and the currently tuned RF signal.
The on-board PIC (programmed IC) connects the control lines of the tuning module
to the front panel using the I
2
C interface and carries out analogue to digital
conversions for the signal strength and AM/FM tuning voltage. The on-board
analogue switches enable the fast and slow tuning filters, muting and de-emphasis.
Audio Amplifier
Preamplifier
The Classik-K includes very subtle adjustments (lift and cut) for bass & treble on the
preamplifier. This allows improvement of the response of the system when using
small speakers or for installations in small rooms. When the volume setting is at
maximum, i.e. 100, the overall gain of the amplifier is +10dB. Unity gain occurs at
around volume setting 73.
The preamplifier output socket (Pre-out) volume is controlled by the Classik’s volume
setting. This allows the user to connect an additional power amplifier, via the Pre-out
sockets to enable bi-amping etc and both power amplifiers (internal & external) will
be controlled simultaneously by the Classik’s preamplifier. The Pre-out sockets are
muted whenever the Classik’s power amplifier is muted. The headphone output is
similarly controlled when a pair of headphones is connected but the power amplifier
and preamplifier are automatically muted when headphones are inserted.
Recording
There are four recordable line-level inputs on the preamplifier – CD, Tuner, Aux and
TP1. The tape facility allows the user to either listen to the source being recorded
directly or listen to the playback of the tape-deck to monitor record and bias settings.
It is not possible to listen to one source while recording another.
The tape output has 0dB (unity) gain relative to the input.
Power Amplifier
The power amplifier section is capable of producing 75 watts RMS into a 4ohm load
at nominal mains level. The gain of the Classik’s power amplifier is +28.3dB.
The two monolithic IC’s which provide the amplification have internal over-current
protection to prevent damage from short-circuits on the output (speaker cables
shorted together etc) and have internal over-temperature protection which shuts
down the power amplifier devices if the temperature rises (this is in addition to the
Classik’s own over-temperature protection circuitry).
Protection and logic
To protect the speakers from possible transients during switch-on/off, there is
hardware and software control of the mute and standby lines to the power amplifier.
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Copyright © 2001 Linn Products Limited. All rights reserved.
