Lowell EQ1 - Manual (Page 4)

4
REMOVABLE
PHOENIX
CONNECTOR
Instruction Sheet
IS-EQ1
Issued: 1-20-14
Lowell Manufacturing Company 100 Integram Drive Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660 Fax: 636-257-6606 Click: www.lowellmfg.com
1 LEVEL control: Sets the level of signal coming into the EQ1. Turn this control down if the over load OL
LED lights up steadily (meaning too strong of an input signal). Since actual unity gain depends on varying slider
settings (which is why we have not marked a unity gain position on the front panel), use the BYPASS switch to
determine the exact unity gain position of this 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. Occasional blinking of this LED is acceptable, but if it re-mains on more than
intermittently, turn down either the LEVEL control on the EQ1 or reduce the output level of the preceding
component that feeds the input of the EQ1 to avoid audible distortion.
EQ1 Front Panel Description
4 1 2 3 5
Filter RANGE switch: The gain range of the filter sliders is switchable (as a group) from ±6 dB for high
resolution, to ±12 dB for maximum boost/cut capability. Yellow & green LEDs indicate the current range setting. 3
POWER: When the EQ1 is plugged into 85-240 VAC, this emits yellow light. 5
Filter level slide controls: Each of these sliders controls the output level of each of the bandpass filters.
Center position is grounded for guaranteed flat response. 4
EQ1 Rear Panel Description
1 2 3 5 4
1 XLR INPUT jack: Accommodates balanced signals. Lowell adheres to the international and U.S. standard
for balanced pin configurations: Pin 1 is chassis ground (neutral), pin 2 is hot (positive), and pin 3 is signal
return (negative). Choose between this XLR and the ¼" TRS Input jack
—use only one—they do not sum.
2 ¼" TRS INPUT jack: This TRS (Tip-Ring-Sleeve) ¼" jack accommodates either balanced or unbalanced
signals. For an unbalanced signal, use a mono ¼" plug (single conductor with shield). For a balanced signal,
use microphone cable (two conductor with shield) with a TRS ¼" plug.
Choose between this ¼” plug and the
XLR Input jack —use only one— they do not sum.
3 ¼" TRS OUTPUT jack: This TRS (Tip-Ring-Sleeve) ¼" balanced jack is compatible with either balanced or
unbalanced systems. For an unbalanced signal, use a mono ¼" plug (single conductor with shield). For a
balanced signal, use microphone cable (two conductor with shield) with a TRS ¼" plug.
The XLR and ¼” TRS
output jacks are wired in parallel with no isolation. Both jacks may be used at the same time.
4 XLR OUTPUT jack: This balanced output is wired per the international and U.S. standard for balanced pin
configurations: Pin 1 is chassis ground (neutral), pin 2 is hot (positive), and pin 3 is signal return (negative).
Outputs can feed from this XLR jack and from the parallel ¼” output jack at the same time.
5 UNIVERSAL VOLTAGE INPUT: This miniature IEC 60320 C6 appliance inlet mates with the IEC 60320
C5 line cord provided (USA domestic). Note: Never lift the ground connection on this power cord.
BYPASS switch: When the switch is pushed in and the red LED is lit, this indicates that the unit is in the
BYPASS mode: signal is routed directly from the input to the output without passing through any active circuitry.
Use this switch to compare equalized and unequalized (bypassed) program material, or to bypass the EQ
section in the event of power loss or unit failure. 2