ME30S Graphic Equalizer

ME30S Front

ME30S Rear


  • Constant-Q Bandwidth Design
  • Overall Level Control and Passive Bypass Switch
  • 20 mm Filter Slide Controls with ±6 dB or ±12 dB Slide Range Switch
  • Infrasonic, Ultrasonic, & RFI Filters
  • Balanced XLR and 1/4" TRS Inputs and Outputs
  • Universal internal switching power supply (100-240 VAC)

ME30S Graphic Equalizer


The Rane ME30S Stereo Constant-Q Equalizer is a one-channel, 1/3-octave design, housed in a one rack-space unit. It features a Range switch for high slider resolution in the ±6 dB mode, equivalent resolution to 45 mm sliders found on the DEQ 60L. The ±12 dB mode provides a wide range of control over system audio.

The active filter sections feature Rane’s innovative constant-Q (constant bandwidth) design. Constant-Q means the bandwidth of each individual filter is guaranteed to be narrow enough to prevent unwarranted interaction between filters, yet wide enough to produce exactly the type of correction curve demanded by even the most unusual acoustic surroundings. This differs dramatically from conventional designs of the past, encumbered with the unfortunate characteristic of changing bandwidth when changing boost/cut amounts.

Front panel controls and indicators include an overall rotary Level control for each channel as well as Overload indicators. Passive pushbutton Bypass switches feature LED indicators, avoiding ambiguity by being on when the unit is Bypassed. (A passive Bypass switch requires no power to operate. This allows completion of the audio path should power fail in the ME30S.)

Inputs and Outputs are electronically balanced designs, capable of unbalanced operation when required. They accept and drive all possible signal levels into normal load impedances. Balanced applications choose between the XLR or 1/4" Tip-Ring-Sleeve connectors. Unbalanced sources also may tie to the ME30S through mono 1/4" connectors (no ring connection).

Constant-Q Filters

Constant-Q graphic equalizers arose from the sound professional’s need for greater control with less interaction than previously possible with conventional equalizers. You use a constant-Q graphic the same way you use a conventional graphic. You just get the desired results quicker, with far less after adjustment to the adjacent sliders.

The accompanying figures dramatically show the advantages of constant-Q designs. For more explanation, consult the references below.

Constant-Q vs Proportional-Q

ME30S Specifications

Parameter Specification Limit Units Conditions/Comments
..........Bands (30) 1/3-octave ISO spacing From 25 Hz to 20 kHz
..........Type Constant-Q      
..........Accuracy 3   % Center frequency
..........Travel 20 mm Positive grounded center detent
..........Range ±12 or ±6 1 dB Switch selectable
Inputs: Type Active balanced / unbalanced  
..........Connectors XLR & 1/4" TRS      
..........Impedance 20k balanced;
10k unbalanced
min Ω  
..........Maximum Level 20 1 dBu  
Outputs: Type Active balanced/unbalanced  
..........Connectors XLR & 1/4 TRS"      
..........Impedance 400 balanced
200 unbalanced
1% Ω  
..........Maximum Level +20 balanced
+15 unbalanced
1 dBu 2 kΩ
  +19 balanced
+13 unbalanced
1 dBu 600 Ω
Overall Gain Range Off to +0
(unbalanced output)
min dB Sliders centered
  Off to +6
(balanced output)
min dB Sliders centered
RFI Filters Yes      
Bypass Switch Yes     Passive
LED Thresholds: Overload 4 1 dB Below clipping
Infrasonic Filter 20 Hz, 18 dB/octave 3% Hz Butterworth
Freq. Response 20-100 kHz +0/-3 dB  
THD+Noise 0.011 max % +4 dBu, 20-20 kHz, 20k BW
IM Distortion (SMPTE) 0.01 max % 60 Hz / 7 kHz, 4:1, +4 dBu
Signal-to-Noise Ratio re +20 dBu
re +4 dBu
    20 kHz noise bandwidth
2 dB Sliders centered, unity gain, balanced
2 dB Full boost, unity gain, balanced
2 dB Full cut, unity gain, balanced
Common Mode Rejection 40 1 dB 1 kHz
Unit: Max. Power 7   W  
.....Line Voltage 100-240   VAC 50/60 Hz
.....Agency Listing       UL/cUL/CE
..... Construction All steel      
.....Size (1U) 1.75" H x 19" W x 5.25" D   (4.4 cm x 48.3 cm x 13.3 cm)
.....Weight 5 lb     (2.3 kg)
Shipping: Size 4.25 x 20.3 x 13.75     (10.8 cm x 52 cm x 35 cm)
.....Weight 8 lb     (3.6 kg)
Note: 0 dBu=0.775 Vrms

ME30S Literature

Each unit is shipped with a booklet containing all of the above, the RaneNote "Sound System Interconnection," Declaration of Conformity, and Rane's 2+ Year Warranty information.

ME30S Support

Can I use both the XLR and 1/4" outputs at the same time?

Yes. Both output connections may be used simultaneously. However only use one input at a time. If you combine a unbalanced 1/4" with a balanced XLR you could create a ground loop problem. See "Sound System Interconnection" below.

What's the difference between the "B" and "S" and "non-B/S" versions?

The earlier (non-B) units only had 1/4" inputs and outputs. Inputs are fully balanced, outputs are single-ended (some say "quasi-balanced") auto balancee/unbalanced. Ability to drive longer cables is less and high frequency rolloff can be a concern due to cable capacitance. Around 1994 we updated the design and changed to the "B" designation. These units have fully balanced inputs and outputs, both XLR and 1/4" TRS connections being utilized. Functionally the units are virtually identical. With the exception of much enhanced grounding, the older units possess almost the same sonic quality. The "S" versions have a new universal power supply, operating from 100-240 VAC (true for all Rane "S" suffix models).

If the above options don't answer your question, or it's urgent...
Phone 425-355-6000, 8:30 AM to 5 PM PST, Monday through Friday.
If it's less urgent, you can email the factory.
For local service within the USA, find a service center.