MQX-2150
The graphic equalizer shall be stereo (2 channels).
Each channel shall consist of 15 bands centered on
standard ISO frequencies at intervals of 2/3 octave
and covering a frequency range of 25Hz to 16kHz.
Individual bands shall be activated by linear slide
faders with a 25mm travel, and a tactile center
detent. The range of equalization per band shall be
switchable between ±15dB or ±6dB.
The equalizer shall have a gain of unity with all
sliders centered, and shall have a maximum in/
out level of +23dBu. Frequency response shall be
±.25dB 20Hz to 20kHz. Hum and noise shall be at
least -96dBu and SMPTE intermodulation distortion
or THD shall be less than 0.01% at +20dBu. Input
impedance shall be 20k ohm balanced, 10k ohm
unbalanced. Output impedance shall be 200 ohm
servo-balanced, 100 ohm unbalanced. Inputs shall
be active (tranformerless) balanced type on both
XLR, 1/4” and euroblock connectors. Individual fil-
ters shall be Wein-bridge type and connected in a
summing circuit optimized for minimum filter inter-
action and constant bandwidth at any slider setting.
Boost and cut characteristics shall be fully symmet-
rical, with the filter being electrically removed from
the circuit in the center (flat) position. Individual fil-
ters shall be accurate to within 3% of indicated cen-
ter frequency and shall be non-adjustable to insure
long term accuracy.
The equalizer shall also include an 18dB per octave
high pass filter at 20Hz, internally selectable. A
green signal presence and red clip indicators shall
show critical operating levels. Input gain shall be
adjustable over minus infinity to +6dB, and an over-
all EQ bypass switch shall be included. The equalizer
shall weigh 6.5 lbs net and mount in a standard 19”
rack using 1 space (1.75” high). The power require-
ment shall be 100-240VAC, 50-60Hz, 24W. The unit
shall be an Ashly Audio MQX-2150.
ARCHITECTS SPECIFICATIONS
TECHNICAL NOTES & SPECIFICATIONS
MQX-2150 Miniature 15-Band Graphic Equalizer
Features:
• Constant "Q" design for low
ripple and minimum interac-
tion
• Precision Wein Bridge Filters
• Balanced XLR, 1/4” TRS and
Euroblock on Inputs and
Outputs
• Selectable 15dB or 6dB Range
•18dB/Octave High Pass Filter
• Low Noise Design
• Silent In/Out Switching
• Signal Present and Clip LEDs
• 25mm Fader with Center-Off
Position
• Safety/Compliance: cTUVus/CE, RoHS
• 5-Year Worry-Free Warranty
The MQX-2150 is very useful device for general tone shaping because it is intuitive and easy to adjust. The visual reference provided by the
slider position gives an approximate idea of the frequency response generated, with the lower frequencies on the left and higher frequen-
cies on the right. Large rooms tend to suffer from multiple reections with long time delays, long reverberation times, and “ringmodes”, all
of which lead to reduced intelligibility and a generally “muddy” sound. As sound travels long distances through the air, high frequencies are
attenuated more than low frequencies. In general, large rooms benet from some low frequency roll-off, high frequency boost, and attenua-
tion of ring mode frequencies.
