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POWERH SERIES<br />
PowerH Series<br />
HI-END REMOTE CONTROLLABLE POWER AMPLIFIERS<br />
The demands placed on modern<br />
power amplifiers are enormous:<br />
maximum output, minimum<br />
weight, the highest possible<br />
degree of efficiency, outstanding<br />
audio characteristics, absolute<br />
reliability, remote supervision<br />
and remote control as well as<br />
network capability.<br />
To realize stable outputs of 2500 W /<br />
4 Ω and 3500 W / 2 Ω per channel,<br />
power amplifiers must be capable<br />
of making available peak output<br />
voltages of 180 V to 200 V. This<br />
requirement limits the number of<br />
34<br />
topologies meriting consideration<br />
to two concepts only: Class D and<br />
DYNACORD’s Linear Grounded<br />
Bridge Class H. Linear Push-Pull<br />
concepts with Class H topology<br />
are proven solutions for power<br />
levels up to 1500 W / 4 Ω.<br />
This is the approach adopted by<br />
many DYNACORD power amplifi ers.<br />
The limitation of the Class H push-pull<br />
approach is the 250 V specifi cation<br />
of typical audio power transistors<br />
and their second breakdown<br />
restrictions. Even exceeding the<br />
specified peak voltage or the<br />
second breakdown limit for short<br />
periods leads directly to a failure<br />
of the power transistors and the<br />
power amplifier. The use of exotic<br />
350 V-specified transistors affords<br />
no reliable solution in view of their<br />
second breakdown behaviour,<br />
their performance and also their<br />
availability.<br />
Higher power classes require<br />
different solutions! DYNACORD‘s<br />
linear Grounded Bridge designs<br />
(e.g. L2400 / P3000) have proved<br />
extremely reliable over many years<br />
as well as outstanding in terms
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