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EQ1 General Description:
The Lowell EQ1 is a single channel 30-band Constant-Q graphic equalizer with thirty 20mm center-detented
linear sliders on ISO center frequencies. The front panel controls include a rotary overall level control, a +12dB
or +6dB range selector switch, an overload clipping light, an EQ bypass switch with LED, and a power LED
indicator. The EQ1 is equipped with rear panel balanced/unbalanced XLR and ¼" TRS phone plug inputs and
outputs. Hook-up is intuitive. Just follow the connector pin-out instructions printed on the rear of the unit.
Polarity convention is per IEC/ANSI/AES standards of pin 2 positive, pin 3 negative and pin 1 shield. The EQ1
does not invert the signal. You may use either the XLR or ¼" TRS phone connectors for input or output. Only
connect to one INPUT connector type. The XLR and ¼" TRS phone plug inputs do not sum, so you must use
one or the other. The XLR and ¼" TRS phone output connectors are wired in parallel (with no isolation between
the two connectors) but you may use both connectors if desired to feed 2 amplifiers or other equipment.
Getting Started:
Please study carefully the "IMPORTANT SAFETY INSTRUCTIONS" that are given on page 2 before applying
power to your EQ1. Those experienced with the process of adjusting a graphic equalizer to tune a sound
system, will find the EQ1 easy to use thanks to the innovative constant-Q circuitry that is designed to minimize
interactions between adjacent bands. For those that have never adjusted a graphic equalizer before, a helpful
section is included in this operators manual with basic instructions for tuning a paging/background-music
system, sound reinforcement system, and a sound masking system. We strongly suggest that you protect your
settings after carefully adjusting the EQ1, by using one of the optional Lowell security covers (sold separately)
that are described below.
Optional Security Covers:
Two security covers are sold separately to prevent tampering with the EQ1 controls.
The Lowell SSC-1V vented security cover and Lowell SSC-1P Plexiglass security cover are shown below.
For rack-mount installation, 2 installer provided rack screws hold the security cover over the front of the EQ1.
For shelf-mount installation, the security cover may be attached to the EQ1 with installer provided screws and nuts.
Lowell EQ1 shown with
optional Lowell SSC-1V
vented security cover
Lowell Manufacturing Company
Call: 800-325-9660
OPERATORS MANUAL FOR MODEL "EQ1"
1/3 OCTAVE GRAPHIC EQUALIZER
Front Panel
Rear Panel
100 Integram Drive
Fax: 636-257-6606
1
INSTALLATION SHEET AND
Lowell EQ1 shown with
optional Lowell SSC-1P
plexiglass security cover
Pacific, Missouri 63069 U.S.A.
Click: www.lowellmfg.com
REMOVABLE
PHOENIX
Instruction Sheet
CONNECTOR
IS-EQ1
Issued: 1-20-14
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Summary of Contents for Lowell EQ1
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Page 1: Front Panel
Hook-up is intuitive. Just follow the connector pin-out instructions printed on the rear of the unit. Polarity convention is per IEC/ANSI/AES standards of pin 2 positive, pin 3 negative and pin 1 shield. The EQ1 does not invert the signal. You may use either the XLR or ¼" TRS phone connectors for input or output. Only connect to one INPUT connector type. - Page 2 Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. CAUTION: Changes or modifications not expressly approved by Lowell Manufacturing will void the manufacturers warranty. REMOVABLE...
- Page 3 EQ1 Block Diagram EQ1 Technical Specifications Note: 0 dBu = 0.775 Vrms (reference) dBu = 20 log (V / 0.775) where V is the rms voltage to be converted to dBu. Sliders: (30) 20mm-travel center-detent controls, 1/3-Octave at ISO spacing from 25 Hz to 20 kHz Filters: Constant-Q design to minimize interactions between adjacent bands Range: + 12 dB or + 6 dB depending on the position of the front panel “RANGE”...
- Page 4 LEVEL control by comparing equalized and bypassed volumes. The OL indicator begins to light at a threshold of 4 dB below clipping and lights fully if any section of the EQ1 is within 3 dB of clipping.
- Page 5 EQ1 without special cabling. Simply connect the feed for the first EQ1 to the XLR balanced input. Use a ¼” TRS phone plug jumper cord to connect the ¼” TRS input jack on the first EQ1 to the ¼”...
- Page 6 Tuning a Sound System for “Flat” Response using the EQ1 A commercial sound system is typically installed for one of two purposes: Either a sound exists at one location and needs to be spread throughout a facility where the original sound cannot be heard (as in the case of a voice...
- Page 7 (RTA). If the feedback is at an isolated frequency, it is possible to slightly lower the gain of the slider on the EQ1 in the 1/3 octave band that contains that frequency.
- Page 8 It is important to use a 1/3 octave graphic equalizer like the EQ1 to restore the frequency content of the sound masking noise to a spectrum that has been determined to optimize the speech privacy effect.
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