Also on this Page : Series 3 / 3A Series 1 and 2
The new DNM 3D Pre-Amplifier is now available.
Demonstrations of this exciting DNM product are now being arranged. Please contact DNM Design on 01480 457989 to book your demonstration.
(Thank you for all your responses to our enquiry about Remote Volume Control - we will include more information about this here soon.)
Previous DNM Preamp Details
The Series 3C Preamplifier
The 3C is a true DNM product incorporating the philosophy of non-metal construction, implemented with great attention to detail, resulting in a reference preamplifier.
Unlike many preamplifiers, the 3C can cope with CD signals perfectly. Most active preamplifiers degrade the sound quality of CD, whilst passive preamplifiers cause dynamic compression of the CD signal.
The control system built into every DNM 3C preamplifier avoids these limitations and allows the required level for each input to be set automatically by the source selector. This selector switches signal and ground connections simultaneously, isolating the ground lines of equipment not in use, to keep the preamplifier's performance optimal at all times.
The unit features plug-in circuit boards for every active input stage. Auxiliary and line inputs are routed through the independent volume controls into an extremely high quality line amplifier. LP replay is passed through two high precision RIAA stages for equalisation.
DNM's experience in advanced circuit design has created unparalleled control of the electrical loading and impedance characteristics of the PCBs.
Like all DNM electronics since 1982, the 3C makes extensive use of star earthing in order to ensure that every point in the amplifier has its own dedicated earth reference - rather than the more conventional bus-bar system used by many manufacturers. In subjective terms, star earthing helps to improve the resolution, clarity and imaging properties of the entire DNM preamplifier range.
The DNM 3C preamplifier models described below are 3C Primus, 3C Twin and 3C Six.
The Primus power supply features a smaller non-acrylic plastic case with a single pair of regulators being supplied by a pair of 1,100µF slit foil reservoir capacitors. Even with the basic power supply, the DNM 3C Primus package gives outstanding sonic results.
Read the Stereophile review of the 3C Primus
The DNM 3C Twin
Our intermediate-priced preamplifier is the DNM 3C Twin. This unit uses more expensive components than the base model. The result is a much closer tolerance set-up procedure for the plug-in boards. The external power supply uses a full-size acrylic case to match the control unit visually. This houses a larger transformer featuring electrostatic shielding and a low noise core. A pair of 10,000µF slit foil reservoir capacitors feed a matched pair of regulators, giving a considerable performance improvement over the base model.
The DNM 3C Six
The DNM 3C Six is simply the best we make. Features additional to those in the DNM 3C Twin include the extensive use of tight tolerance resistors and decoupling capacitors in the control unit.
The full-size acrylic power supply case houses a carefully selected screened low noise transformer. A pair of DNM 10,000µF slit foil reservoir capacitors feeds three pairs of matched regulators which allow individual power supply drive to each amplification stage in the DNM 3C Six control unit, effectively giving 24 separate on-board power supply stages.
The DNM 3C preamplifier uses advanced technology in truly imaginative and lateral ways to bring the listener closer than ever before to the live sound. Such attention to detail in our amplifier designs results in a preamplifier which is refreshingly different, one which can sound delicate and at the same time convey the weight and gravitas of the performance. The DNM 3C Six will continually surprise listeners with its expansive dynamics and expressive resolution.
Technical specifications for all Series 3C preamplifiers :
The DNM Series 3 and 3A Preamplifiers
Front and top view : the DNM 3A Preamplifier
DNM Design recently located in their archives an original set of DNM Series 3 and Series 1/Series 2 preamplifier Operating Notes. These have been photographed and converted to 3MB PDF files to assist Series 3/3A preamplifier owners :
Series 3 / 3A Operating Notes
(The main difference between the Series 3 and 3A was a change of motherboard connectors for the plug-in pcb's.)
Top view : the DNM 3A Preamplifier
The DNM Series 1 and 2 Preamplifiers
DNM Design also found in their archives an original set of Series 1/ Series 2 preamplifier Operating Notes. These too have been photographed and converted to a 3.3MB PDF file for Series 1 / Series 2 preamplifier owners :
Series 1 / Series 2 Operating Notes
Further photos plus notes on the Series 2A preamplifier will be added later.
New DNM 3D preamp
DNM Power Amplifiers
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