BPC 7.3
GENERAL INFORMATION
We congratulate you on your choice of the Dynamic Precision BPC 7.3.
The technical solutions are all based upon the best high quality switches, connectors and discrete
components available, and the company’s unique knowledge to achieve the best possible reproduction of
musical signals.
The BPC 7.3 is fully balanced and DC-coupled from input to output. BPC 7.3 is designed to be able to drive
relatively long cables, normally a problem what passive controllers concern. To achieve this we had to
reduced the output impedance to a level lower than 2.4 kΩ.
BPC 7.3 has a minimum input impedance of 5.5 kΩ. Please observe that valve equipped D/A converters
and/or MC-amplifiers equipped with coupling capacitors smaller than 0.1 µF may suffer from a bass level
reduction because of the low level input impedance of BPC 7.3. Consult the signal source users manual to
find out if the signal source is able to work with loads as low as 5 kΩ. It is equally important to be aware of
the fact that the input impedance of BPC 7.3 will rise to 10.5 kΩ. when the "LEVEL STEP -1dB" is in the
position marked -10 dB. The latter will lower the load of the signal source output and may in turn cause an
increase of the sub-bass level.
Dynamic Precision power amplifiers is designed to accommodate passive balanced configurations by
keeping the input capacitance between 100 pF and 200 pF (please consult the Users Guide for that
particular power amplifier). As a result of this, the cable length between BPC 7.3 and the power amplifier
can be extended compared to other power amplifiers normally having a higher input capacitance (500 pF to
1000 pF). The inter conductor capacitance for balanced cables is normally 100 pF - 120 pF per meter, and
this gives a combination of BPC 7.3 and a Dynamic Precision power amplifier the advantage to be
interconnected with cables as long as 9 meters and still achieve the similar affect on the treble level as
power amplifiers with an input capacitance of 1000 pF.
The resistive part of the input impedance, for power amplifiers is of minor importance.
From an audible point of view, it does not matter if the resistive input impedance for a power amplifier is
10 kΩor 100 kΩ, but what really matters when using passive controllers is to keep the capacitive load as
low as possible. The latter is achieved using interconnect cables as short as possible (between the pre-
amplifier and the power amplifier), and have the lowest possible input capacitance on the power amplifier.
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