Description - Dynacord L300 Owner's Manual

DESCRIPTION

DESCRIPTION
First of all we should like to thank and congratulate you for choosing the power amplifi ers of the LINEAR
PRECISION SERIES.
DYNACORD power amplifi ers of the LINEAR PRECISION SERIES meet the most stringent requirements
of tough touring applications. They are protected against high-temperature, overload, shorted outputs,
radio frequency interference and DC faults. The power transistors are protected from back-EMFdamage
by means of an additional protective circuit. For the so-called soft-start the power outputs are switched
on delayed via relays. An inrush current limiter circuit prevents the mains fuses from being blown.
Maximum precision is also guaranteed as regards mechanical construction and fi nish. The robust steel
chassis features remarkable torsion resistance and is particularly designed to cope with the tough wear
and tear associated with going on tour in the rock & roll business. Thermal stability is guaranteed by
several low-noise 3-stage fans which also means that the amplifi ers can be used inside the studio.
Comparator circuits constantly monitor the power amplifi ers' input and output signal and control
the internal limiters in case of non-linear operating conditions. They protect the loudspeakers from
overload due to clipping of the amplifi er. The LINEAR PRECISION power amplifi ers feature excellent
transmission properties. These power amplifi ers topology also makes for extremely low distortion rates.
Distortion factor (THD), intermodulation distortion (SMPTE-IM) and transient intermodulation distortion
(DIM 30 and DIM 100) are so low that they are only detectable with the most sophisticated measuring
equipment. Generously dimensioned power supplies with low-leakage toroidal-core transformers provide
considerable headroom well above the nominal ratings. V/I foldback limiter circuits were deliberately not
included in the Linear Precision power amplifi ers to facilitate operation at complex loads up to a phase
angle of +/- 90°.
The inputs are electronically balanced on XLR connectors. (Isolation transformers can be retrofi tted).
Direct Outs in the form of XLR connectors (male), to daisy-chain the signal, are also standard features.
The modes DUAL/Stereo or PARALLEL/Mono can be selected via the Input Routing Switch. Furthermore,
the LINEAR PRECISION power amplifi ers can also be operated in "Mono Bridged" mode.
The front panel accommodates the dB-calibrated input Gain controls which are designed as particularely
precise and safe-to-operate detented potentiometers. The LED display provides information about the
power amplifers' operating status. For the two channels, they indicate readiness to operate, whether
there is a signal at the input or output, when the Limiters have been activated and whether one of the
protective circuits has been triggered. The power outputs Channel A, Channel B and Bridged Out are
available on Speakon connectors. The rear panel also accommodates the ON/OFF switches for the
integrated Hi and Lo cut fi lters, a groundlift switch which separates the chassis from the circuit ground
thus helping to prevent hum loops and the operating mode selector for mono bridged operation. All
LINEAR PRECISION power amplifi ers can be used in normal applications on loads as low as 2 ohms and
in bridged mode down to a minimum of 4 ohms. They also feature extremely quiet fans with front-to-rear
airfl ow, facilitating operation in large and narrow amplifi er racks.
This Owner's Manual is meant to help you familiarize yourself with all the LINEAR PRECISION SERIES'
other features. Please read it through carefully and we guarantee that your new power amplifi er of the
LINEAR PRECISION SERIES from DYNACORD will give you great pleasure.
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