Lowell MIX1 - Manual (Page 5)

5
REMOVABLE
PHOENI X
CONNECTOR Lowell Manufacturing Company 100 Integram Drive Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660 Fax: 636-257-6606 Click: www.lowellmfg.com
Instruction Sheet
IS-MIX1
Issued: 6-1-14
When the MIX1 “LOW FILTER” switch is in the “ON” position, the low frequency content is rolled off in the “MAIN
OUT” output, “MIC” balanced output, and “LINE” balanced output. This is particularly useful in a case where
microphones are exhibiting bass frequency “boominess”, or for an application in a reverberent space (such as a
gymnasium) when low frequencies reduce speech articulation. We recommend that the low cut filter always be
engaged to act as horn protection (trumpet protection) when the sound system is feeding paging horns.
LOW CUT FILTER SWITCH
The red “PEAK” LED located on the front panel flashes when the peaks are approaching full output. Ocasional
flashing of the “PEAK’ led is acceptable. A steady bright red glow could indicate that the MIX1 mixer/preamplifier is
being over-driven, or there is sub-sonic or ultra-sonic oscillation in the system and these conditions should be
corrected.
PEAK LED (RED)
The MIX1 balanced “MIC” level and “LINE” level outputs are available at screw
terminals. These outputs are fed after the master volume control and low cut filter.
BALANCED MIC AND LINE OUTPUTS
GND MIC + +
_ _
LI NE
The MIX1 “TAPE OUT” connection is an RCA phono jack. The connecting output cable should
be wired with the pin “hot” or “+” and with the sleeve “common” or “-”. The tape output jack is
available to feed a recording device and is not affected by the master volume control or the low
cut filter.
TAPE OUTPUT
Sleeve
_
+
Pin
The MIX1 mix bus connection is an RCA phono jack. The connecting output cable should be
wired with the pin “hot” or “+” and with the sleeve “common” or “-”. The mix bus jack is available
to link up to a maximum of four (4) MIX1 mixer/preamplifiers and is not affected by the master
volume control or the low cut filter. When MIX1 units are linked by connecting the mix buses, all
inputs appear at the outputs of all units. Note: The muting functions are only local to one mixer.
MIX BUS LINK JACK
Sleeve
_
+
Pin
MUTING-PRIORITY SCHEME
The MIX1 mixer/preamplifier includes a unique voice-activated (VOX) ducking/muting circuitry. When a page is
made, other inputs (such as a music input) that are set up at a lower muting level, softly lower in volume during the
page. If the volume of the page is not strong, the music will only duck in volume (not be completely muted). If the
incoming page is strong in level, the music volume will be completely muted. When the page has been completed,
the volume of the music will return to its normal level. The MIX1 has two muting schemes that may be selected at
the “MUTE” switch on the rear of the unit. With the “MUTE” switch is in the “2-8” position, an input to either the
channel 1 mic screw terminals or the channel 1 aux input, will mute all other channels mic and aux inputs. With the
“MUTE” switch in the “A-B” position, an input to any of the channel 1-6 mic screw terminals or aux inputs, will mute
the channel 7 aux input (from either the channel 7
“A” or “B” RCA input jack).
5) Finally turn up the rest of the input controls on the MIX 1 to the desired level to balance with the input that was set
in Step 3 (making sure that the peak light rarely flashes).
OPERATING INSTRUCTIONS
Setting the controls on the MIX1 is dependent on the particular application and system design , but there are some
basic guidelines that should be followed to maximize the performance of the mixer/preamplifier:
1) Set your power amplifier’s level control all the way down (fully counter-clockwise).
3) Choose the most important input (for example the paging microphone) and turn up that input control while talking
into the microphone until the peak light starts to flash. Then turn down that control to where in normal use the
peak light no longer flashes.
4) Turn up your power amplifier’s level control to the desired system volume.
2) Set the “MASTER” volume control on the MIX1 to about 70% (about 2 o’clock).