What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

dbx 3BX & 3BX-R


The 3BX is the most advanced dynamic range expander ever developed. It restores much of the drama, impact and excitement of a live performance by making loud passages louder and soft passages quieter.

Bass, midrange and treble frequencies are sensed in the music signal and expanded individually from extraordinary clarity of soud from even the most complex musical material. Three rows of LED's are used to monitor the degree of expansion in each of the three frequency ranges. An expansion level control lets you want, up to 50%. ANd, with the transition level control, you can adjust the threshold of expansion to vary the level above which the music signal is upward expanded. The 3BX is the most sophisticated and flexible dynamic range expander on the market. With, you can bring new life to your entire record and tape collection as well as dramatically increase your enjoyment of radio broadcasts. The 3BX is provided with a tape monitor loop to replace the one used on your receiver or preamp.

3BX-R remote Control

The 3BX-R not only allows you to operate your 3BX Dynamic Range Expander at a remote location, it also gives you more control capability. It includes a release time of the 3BX to the type of music you're playing - fast for high energy rock, slow for quiet symphonies. There's also a fade switch for automatically lowering the music level for fade down or raising the level for fade up - ideal for making professional fades during recording. Other features include a master volume control for your entire system, a 3BX bypass switch, and LED displays that indicate the operational mode of the 3BX. A 25-foot cable comes with the 3BX-R, and a 25-foot extension cable is available as an option.

3BX Specifications

Expansion Ratio: Continuously adjustable from 1.0 to 1.5 (0 to 50% increase)linear in decibels

Dynamic Range: 100 dB (peak signal to weighted background noise)

Input Impedance: 50 kΩ

Input level: 300 mV nominal

Input level: 7 V RMS maximum

Output Impedance: 100 Ω (designed to drive 5 kΩ or greater)

Output Level: 7 V RMS (max. 20 Hz - 20 kHz)

Frequency Response: 20 Hz - 20 kHz ±0,5 dB at 1,0 expansion

Equivalent Input Noise: -85 dBV (unweighted, 20 kHz bandwidth, referenced to 1 V)

Total harmonic Distortion: 0,1%, typical at 1.0 expansion 20 Hz to 20 kHz

IM Distortion: 0,15% typical

Power Line Requirement: 117 V AC, 50 - 60 Hz

Power Line Consumption: 30 W

Dimensions (W x H x D): 17¾" x 3¾" x 10¼" (45,1 x 9,5 x 26,0 cm)

Weight (shipping): 12 lbs (5,45 kg)

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