Stereo Optical Preamplifier, DNR, Exciter Lamp / LED

Product no.: 3160

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SOLAR 4 - High Quality Stereo Optical Sound Preamplifier

with Dynamic Noise Reduction (DNR)

Version for Exciter Lamp and LED Sound Readers


The mono or stereo optical sound signal is processed optimally by the SOLAR 4. The intelligent DNR* circuit - a high quality dynamic noise reduction - provides up to 24dB of noise attenuation without the undesirable artefacts (noise modulation, "pumping") known from other NR systems, because its design is based upon the principles of modern psychoacoustic science.

Not only Dolby* A and SR, but also traditional optical sound (16mm and 35mm) is processed with excellent results. The audio signal is cleaned very carefully. As well as noise the crackling of an old and dirty film is attenuated effectively without affecting the fidelity of the source material. The slit loss correction SLC compensates for high frequency loss and linearizes the frequency response. 

These are the features to make the SOLAR 4 the first choice for a high-quality yet inexpensive solution for your optical sound reproduction:

  • Adaption to the photoelectric cells and to the scan technique of the projector (input impedance, input sensitivity, high frequency content; each adjustable separately for both channels)
  • Very low noise amplification
  • Optical sound de-emphasis network (slit loss correction SLC)
  • Separate volume controls with level indicators for both channels
  • Dynamic noise reduction DNR (can be switched off) with up to 24dB of noise attenuation without sonic artefacts
  • Stereo-mono toggle
  • Additional AUX stereo input for interval music or announcements, with additional amplification and volume control
  • Input selector for optical sound and AUX
  • Easy control: 3 push-buttons with LED indicators
  • Easy store functionality for a defined start-up condition of input selector, DNR on/off and stereo/mono
  • RCA (cinch) connectors for uncomplicated connections
  • Compact, elegant aluminum case with operation indicator
  • Detailed, illustrated user guide
  • Power pack included (230V~/50Hz for Europe, 115V~/60Hz for USA)

The SOLAR 4 is compact, easy to install and to control. It provides a precisely processed signal to connect to a Dolby Surround* decoder or to a preamplifier or power amplifier with volume control. The SOLAR 4 is the optimal interface between film projector and HiFi/Surround system. As a result, the SOLAR 4 is the ideal device to build an inexpensive sound system for home and professional applications: movie theater, university, club, home movies, uncomplicated use with mobile film projections, replacement of obsolete preamps in cutting tables etc.

* DNR is a registered trademark of National Semiconductor Corporation. * Dolby, Dolby A, Dolby SR, Dolby Surround are registered trademarks of Dolby Licensing Corporation.

Download User Guide

Stereo Optical Preamplifier with DNR
for Exciter Lamp / LED Sound Readers
Comes with:
- Power Supply
- Adjusting Pen
- Sound Level Test Film Dolby CAT 69T (Dolby Tone), 2m
- User Guide (english language)

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