T+A POWER PLANT MK I, User Manual

Page: 26 / 44

26
Tone control
functions
   
The integrated amplifier is equipped with a volume-dependent tone control
(
LOUDNESS ) circuit, which compensates for the frequency-dependent
sensitivity of the human ear at very low volume levels, due to the characteristics
of aural physiology.
Pressing the     button switches the loudness circuit on and off.
The red LED above the button glows when LOUDN is switched on.
   
The FLAT function by-passes the tone control section of the integrated amplifier
and therefore disables the tone controls . The frequency response is then
absolutely linear.
The FLAT mode is switched on and off by pressing the     button.
The red LED above the button glows when FLAT mode is switched on.
      
In FLAT mode the

 

/

 

controls have no effect.
The LOUDNESS function is also available in FLAT mode.
Recessed controls
In normal use the knobs for tone and balance are recessed into the front panel.
If you press any of the knobs, it projects from the front panel and can then
easily be rotated. In the centre position the index marker points up, and you will
feel the detent engage.
When the setting is correct, push the knob back into the front panel, and it will
engage in its recessed position again.
   
/
   
(tone controls)
To compensate for adverse influences on reproduction quality caused by your
listening room, or imperfect loudspeaker positioning, the integrated amplifier is
fitted with an active, infinitely variable tone control system.
The tone controls are deliberately designed to affect only the low frequencies
below 300 Hz (
BASS ) and the high frequencies above 4000 Hz ( TREBLE ); this
avoids unwanted coloration in the critical mid-range sound.
•
When the tone controls are at centre, the frequency response is linear.
•
Rotating the controls clockwise increases the bass or treble.
•
Rotating the controls anti-clockwise reduces the bass or treble.

 
