nonlinearity conditions inside the amplifier caused by
overdrive, overload or defect and keeps the signal shape
unaltered under any circumstances.
The NLR circuit keeps signal shape distortion under 5%
and thus guarantees a clean sound and effective speaker
protection.
TCL: indicates signal limiting as a result of heat sink over
temperature (above 80°C). This helps to prevent the
triggering of the internal thermal shut-off circuit, which
would step in at 90°C heat sink temperature as a final
safeguarding measure. TCL becomes only active when
the regular cooling mechanism fails to work properly, e.g.
by a dirty heat sink, or obstructed air-flow. A lit TCL LED
should always be taken as a sign to check for sufficient
cooling air supply.
4. Grounding
For maximum performance we recommend the use of two
conductor shielded cable for making input connections.
Because the shield does not carry audio signal, interference
between signal current and audio current is minimised in this
way. While wiring up your system take following important
points into consideration:
1. Never use a ground lift adapter on the mains feed. The
isolation system of this product takes into account that the
chassis is connected to earth at all times. This product will
become unsafe if the chassis is disconnected from earth.
2. Most installations use a mix of balanced and
unbalanced connections with a variety of equipment being
connected. In case you experience a hum or buzz
problem, do not be afraid to experiment.
Pin 1 of the input connectors (and direct out connectors) is
connected to chassis ground. In a perfect world it would be
possible to simply connect the sleeves of the signal cables to
pin 1 at both ends of the cable. This would in effect make the
cable screen an extension of the chassis between the two
interconnected pieces of equipment and provide for perfect LF
and HF screening of the audio signals.
Problem however is that some equipment use badly organised
internal grounding and will generate hum and buzz because of
earth currents flowing through the internal signal ground. In
such case it is necessary to stop the earth currents from
flowing by disconnecting pin 1 from the sleeve. Use the
figures below as a guidance to solve problems with hum or
buzz.
8
PTH SeriesUser Manual
Source
Output
Amplifier
Input
2-wire mains cord
3-wire mains cord
Source
Output
Amplifier
Input
Grounded
Floating
Unbalanced
Source
Output
Amplifier
Input
2-wire mains cord
Floating
Source
Output
Amplifier
Input
3-wire mains cord
Grounded
Balanced
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