Table of Contents
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NOTE: This document was reconstructed from the original printed Users' Manual.
Specifications: Models 4100, 41OORM ............................................................................. 2
ELECTRICAL ................................................................................................................ 2
MECHANICAL .............................................................................................................. 3
OPTIONS ........................................................................................................................ 3
MODEL 4100 STEREO EQUALIZER USER'S MANUAL ............................................. 4
INTRODUCTION........................................................................................................... 4
UNPACKING ................................................................................................................. 4
CONNECTION TO THE SYSTEM ................................................................................... 4
CONTROLS.................................................................................................................... 8
POWER ON-OFF: ...................................................................................................... 8
EQ IN-OUT:................................................................................................................ 8
LEVEL: ....................................................................................................................... 8
OVERLOAD:.............................................................................................................. 8
ACCESSORY SOCKET:............................................................................................ 9
ADJUSTMENT AND EQUALIZATION ...................................................................... 9
BI-AMPLIFICATION .................................................................................................. 11
OTHER APPLICATIONS ............................................................................................ 12
CIRCUIT DESCRIPTION............................................................................................ 13
WARRANTY:............................................................................................................... 18
Damage in Shipment: .................................................................................................... 18
Return Shipment: .......................................................................................................... 18
Schematic Diagram: .......................................................................................................... 19
Model 4100
Two Channel
Active LC Octave Band Equalizer
1
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Table of Contents
Summary of Contents for White Instruments 4100
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Page 1: Table Of Contents
NOTE: This document was reconstructed from the original printed Users' Manual. Specifications: Models 4100, 41OORM ................2 ELECTRICAL ........................ 2 MECHANICAL ......................3 OPTIONS ........................3 MODEL 4100 STEREO EQUALIZER USER'S MANUAL ..........4 INTRODUCTION......................4 UNPACKING ......................... 4 CONNECTION TO THE SYSTEM ................... 4 CONTROLS........................8 POWER ON-OFF: ...................... -
Page 2: Model
Specifications: Models 4100, 41OORM ELECTRICAL 2 IC quad amplifiers, 2 IC regulators, 2 CIRUITRY: transistors, 2 zener diodes, 6 diodes, and 3 LED's. Precision-tuned inductors in all negative feedback circuit, magnetically shielded for low hum pickup. OPERATING RANGE (FREQUENCY): 20 Hz (-3 dB) to 20 kHz (-1 dB). -
Page 3: Mechanical
Order 4101-frequency for 12 dB/octave or 4102-frequency for 18 d8/octave. RACK MOUNTING: Specify Model 4100 RM. ! W A R N I N G ! TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS APPLIANCE TO... -
Page 4: Model 4100 Stereo Equalizer User's Manual
The instructions for doing this follow. The input impedance of the Model 4100 is high – greater than 40,000 ohms. This means that it will not appreciably "load" the output. circuit of modern high fidelity preamplifiers... - Page 5 (see Figure 1). The PREAMP OUT is connected via the supplied hi-fi patch cable to the INPUT jacks on the rear of the Model 4100. Be sure to observe the order of the left and right channel connections. OUT 1 (NORM) of the Model 4100 is then patched back into the POWER AMP IN of the receiver, again observing the order of the left and right channels.
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Page 8: Controls
In this manner, the POWER switch of the Model 4100 may be left in the ON position and the unit controlled from the main switch of the system. A pilot lamp in the center of the front panel indicates whether or not the unit is on. -
Page 9: Accessory Socket
OCTAVE BOOST/CUT: These controls are the heart of your Model 4100 Stereo Equalizer. It is with these controls that the electrical response of your system is adjusted to complement the acoustics of the listening environment. Each of these controls is centered on an International Standards Organization (I.S.O.) octave center from 31.5 Hz to 16 kHz. - Page 10 CONTROLS CAREFULLY TO A CONVENIENT MEASURING LEVEL. MAKE CERTAIN THAT ALL HIGH FREQUENCY BOOST CONTROLS IN THE MODEL 4100 ARE IN THE FLAT POSITION. HIGH FREQUENCY DRIVERS CAN BE BURNED OUT BY ENERGY THAT THE EAR DOES NOT HEAR. Next, a standard microphone compatible with the analyzer is placed in the center of the listening area.
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Page 11: Bi-Amplification
each one octave interval, adjust the equalizer controls carefully. No large boost setting should be used. Generally speaking, there should be at least as many cut settings as there are boost settings. Working through the spectrum, each channel requiring it is adjusted keeping in mind the comments above on rolling off the high frequency. -
Page 12: Other Applications
(for 12 dB/octave) or Type 4102-frequency (for 18 dB/octave) may then be ordered through your dealer. Only insertion of the network into the rear chassis accessory socket and proper connection of the Model 4100 to your system (see Figure 3) is then required. OTHER APPLICATIONS The Model 4100 may be used for applications other than equalization of music reproduction systems. -
Page 13: Circuit Description
CIRCUIT DESCRIPTION The Model 4100 Stereo Equalizer incorporates RLC elements for response control in an audio system. It contains one octave filter sections, continuously adjustable from +10 dB of emphasis to -10 dB of cut, in each one octave band. - Page 14 In effect, the individual filter sections combine to make up a single filter whose electrical response curve is free of unwanted ripple and excessive phase shift. In fact, the Model 4100 can provide extended shelving functions up to +10 dB with no ripple and no phase shift between adjacent center frequencies.
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Page 18: Warranty
Our warranty is limited to repairing or replacing any product which fails during the warranty period from normal use. White Instruments, Inc. will not be liable for any damage resulting from the use of this instrument.