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Oldal 1/13
HD
REFERENCE
Operating Manual
Fredenstein HD Reference Preamplifier
The Fredenstein HD Reference microphone preamplifier utilizes a completely new approach to
microphone level amplification. Many in the recording industry are now using 96 kHz or 192 kHz
sampling rates while tracking, but still using equipment, which cannot provide the frequency
response or bandwidth provided by modern A/D converters. The HD Reference overcomes these
limitations and yields a new sound quality. Especially for wider bandwidth sources, like acoustic
instruments, voices, and drums, the HD Reference is simply unequaled. It is the preferred choice
for classical recordings as well.
The HD Reference was preceded by the HD Pre which was designed for the 500 Series racks, but
that format does have limits regarding available voltage and current plus imposes some restraints on
the available physical area. Never the less, the HD Pre set new levels of performance in all of the
important parameters pertaining to mic pre-amplifiers. The HD Reference surpasses the HD Pre due
to higher voltage power supplies +/-24V rather than +/- 16V, higher current ( vs +/- 150mA), and ??
even more discrete transistors (from 54 in the HD Pre to 64 in the HD Reference).
The HD Reference also goes a step further by allowing a full featured Remote Control called The
Commander that can access every function on the front panel. The HD Reference and Commander
are connected with a conventional XLR cable, that can be routed though a patch bay if necessary.
With 920kHz bandwidth available, it makes little sense to risk losing that fidelity with a mic driving
100 feet or more of mic cable. With the HD Reference placed close to the microphones and short
mic cables in use, the engineer can realize the benefit of bandwidth.
The HD Reference also has a few added features, such as a display that shows gain in dB next to the
knob that allows one to set gain in accurate 1dB steps, which is great for setting up stereo pairs. We
also added more choices to the High Pass Filter (Off, 39Hz, 82Hz) and more choices to the Input
Impedance (200K, 1K, 300, 232).
In terms relating to audibility, the HD Reference is very very fast, clean and true to the source, with
very low noise. And for the technically inclined, it does this without negative feedback and,
maintains outstanding performance at any and all gain settings, which is rare indeed.
Besides incorporating a fully discrete signal path and a Class-A balanced output stage, the HD
Reference uses a revolutionary current amplification circuit, which neutralizes internal transistor
capacitance (Miller Effect) that limit frequency response and slew rate in conventional voltage
amplifiers. As a result, the HD Reference features an unprecedented bandwidth of over 900 kHz.
The HD Reference may also be unique in the world of mic pre-amps in needing moderate sized heat
sinks that one might expect to see in a small power amp. The output stage is also really Class A,
running on 48 volts and can drive +29 dBm (60 volts peak to peak). And this implies appreciable
idle current, and some heat generated.. No problem driving long lines and still sounding fine
though, thanks to that available current...
The HD Reference does not use input or output transformers. These would prevent the pre-amp
from having the amazing specifications and performance that it is capable of. The F601A Mic Pre
has both an input transformer and output transformer that can be inserted or bypassed. The F609,
F676, F200, V.A.S and Artistic Mic Pre's all have transformers and each has special applications in
where they excel and compete with well known vintage pieces.
Fredenstein HD Reference Manual V1.0 Feb 5, 2016 Page 1
Fredenstein HD Reference Preamplifier
Installation:
Electrical Safety Warnings:
Do not open the enclosure, hazardous voltages are present inside!
There are no user serviceable parts inside.
Refer servicing to qualified personnel.
Do not expose this appliance to rain and moisture.
Do not block any ventilation openings. Do not install near heat sources.
Protect the power cord from being walked on or pinched. Do not defeat the
safety purpose of the polarized or grounding plug and connect to a properly
grounded mains socket.
According to WEEE Directive (2012/19/EU) this product must not be disposed
with household waste. This product should be taken to a licensed EEE collection
center for recycling.
If you need to replace the mains fuse, make sure the replacement has the same
rating , 2AT 250V, slow blow (2 Amp) in the IEC socket on the HD Reference.
If you need to replace the mains fuse, make sure the replacement has the same
rating , 1AT 250V, slow blow (1 Amp) in the IEC socket on the Commander.
The HD Reference does get hot. This is a result of it using 4 Class A amplifiers
on 48 Volt rails, which, in terms of heat generated, is like having a 15 watt light
bulb in a 1U box.
Please provide for some space directly above and below for ventilation.
Fredenstein HD Reference Manual V1.0 Feb 5, 2016 Page 2

Termékspecifikációk

Márka: Fredenstein
Kategória: Vevő
Modell: HD Reference

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