Rane | ME 60 | Data Sheet | Rane ME 60 Equalizer Data Sheet

Rane ME 60 Equalizer Data Sheet
DATA SHEET
ME 60
microGRAPHIC EQUALIZER
General Description
The Rane ME 60 Stereo Interpolating Constant-Q
Equalizer is a two Channel, 1/3-octave design, housed in a
two rack-space unit. The ME 60 evolved by combining two
ME 30B equalizers in one unit and then embellishing both.
Two adjustable band limiting filters add to each channel’s
versatility, as well as the increased flexibility gained from the
additional RCA input and output connectors. These extra
features nicely complement the proven ME 30B design.
The active filter sections feature the GE 30’s innovative
interpolating 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 needed. This differs
dramatically from proportional-Q designs encumbered with
the unfortunate characteristic of changing bandwidth for
every boost/cut level.
Aside from being a constant-Q device, the ME 60 also
provides what Rane has dubbed “interpolating” performance.
This means that when two adjacent bands are boosted or cut
to the same level, the response of the equalizer peaks (or
interpolates a response) at a frequency centered between the
filters. Interpolating performance allows effective control
between ISO centers.
ME 60 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 restoration of the audio path
should power fail in the ME 60.)
The rear of the ME 60 provides an unusually flexible
array of connector choices. 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 ¼" Tip-Ring-Sleeve balanced connectors, while consumer products normally use the unbalanced
RCA phono jacks. Unbalanced sources also may tie to the
ME 60 through mono ¼" connectors (no ring connection).
Features
•
•
•
•
•
•
Stereo 1/3-Octave Design
±12 dB Boost & Cut Range
Interpolating Constant-Q Bandwidth
Sweepable Low & High Cut Filters
Channel 1 & 2 Level Controls
Passive Bypass Switches
•
•
•
•
•
•
20 mm Filter Slide Controls
Grounded Center Detents
RFI Filters
Balanced XLR, ¼" TRS, and Unbalanced RCA Connectors
UL Listed for USA, cUL Listed for Canada (120 VAC)
Meets CE Requierments for EMC and Safety (230 VAC)
Data Sheet-1
ME 60
microGRAPHIC EQUALIZER
Features & Specifications
Parameter
Equalizer:
..........Channels
..........Bands
..........Type
..........Accuracy
..........Travel
..........Range
Inputs:
..........Type
..........Connectors
..........Impedance
..........Maximum Level
Outputs:
..........Type
..........Connectors
..........Impedance
..........Maximum Level
Overall Gain Range
RFI Filters
Passive Bypass Switches
Overload LED Threshold
Low Cut Filter
High Cut Filter
Frequency Response
THD & Noise
IM Distortion (SMPTE)
Signal-to-Noise Ratio
Channel Separation
Common Mode Rejection
Maximum Power
Line Voltage:
..........Domestic
..........Export
Unit: Agency Listing
..........120 VAC model
..........230 VAC model
..........Construction
..........Size
..........Weight
Shipping:
..........Size
..........Weight
Note: 0 dBu=0.775 Vrms
Data Sheet-2
Specification
Limit
Units
Two
(2x30) 1/3-Octave ISO Spacing
Interpolating Constant-Q
3
20
±12
1
%
mm
dB
Active Balanced/Unbalanced
XLR, ¼" TRS & RCA
>20k Balanced
+21
1%
1
ohms
dBu
1%
1
1
min
ohms
dBu
dBu
dB
1
3%
3%
±0.5
+0/-3
.002
.003
dB
Hz
Hz
dB
dB
%
%
2
3
1
dB
dB
dB
W
Active Balanced/Unbalanced
XLR, ¼" TRS & RCA
200 Bal; 100 Unbalanced
+21 Bal; +15 Unbalanced
+19 Bal; +13 Unbalanced
Off to +8 (Balanced Out)
Yes
Yes
4
10-250 Hz, 12 dB/octave
3k-40 kHz, 12 dB/octave
20-20 kHz
10-40 kHz
0.008
0.005
re +20 dBu / +4 dBu
112 / 96
75
46
12
Conditions/Comments
From 25 Hz to 20 kHz
Smooth combining
Center frequency
Positive grounded center detent
2k ohms
600 ohms
Sliders centered
Below clipping
Butterworth
+4 dBu, 20-20 kHz
60 Hz / 7 kHz, 4:1, +4 dBu
20 kHz noise BW; balanced out
Sliders centered, unity gain
1 kHz
1 kHz
105-130 VAC, 50/60 Hz
205-250 VAC, 50 Hz
UL
cUL (Canada)
CE-EMC EN55013 & EN55020
CE-Safety EN60065
All Steel
3.5" H x 19" W x 8.5" D (2U)
9 lb
UL 813 (file E104174)
C22.2 (file E104174)
EMC directive 89/336/EEC
LV directive 73/23/EEC
(8.9 cm x 48.3 cm x 21.6 cm)
(4.1 kg)
4.5" x 20.3" x 13.75"
12 lb
(11.5 cm x 52 cm x 35 cm)
(5.0 kg)
ME 60
microGRAPHIC EQUALIZER
Block Diagram
(Channel 1 Shown, Channel 2 Identical)
Application Information
The ME 60 offers the same high quality interpolating
constant-Q performance as its relative, the GE 30. No
compromises or trade-offs exist in selecting the ME 60. It is
constructed using only precision audio-grade components and
advanced integrated circuits, all assembled onto mil-spec
glass-epoxy printed circuit boards.
The adjustable filters are useful when it is desirable to
band limit the audio signal. For instance, restricting high
frequencies to match the incoming signal usually produces the
most quiet system. And a common use for the Low Cut filter
is limiting the signal going to 70 volt speaker systems. Often
low frequencies saturate the loudspeaker transformers.
Restricting these signals greatly improves system intelligibility. Full bandwidth use requires positioning both sliders to
their lower limits. This effectively removes the filters and
guarantees 20-20 kHz ±0.5 dB performance.
The interpolating constant-Q performance of the ME 60
arose from the sound professional’s need for greater control
with less interaction than previously possible with conventional equalizers. Truth in slider position became a requirement. The curve traced out by the slider positions on constant-Q designs indeed represents the actual changes to the
frequency response. On conventional designs they do not.
Combine this feat with the Rane-developed “interpolating”
characteristic and you have a tool without peer.
The ME 60 goes one step further toward being the best
device for any application. It offers the choice of all common
audio input and output connectors. The inclusion of XLR, ¼"
TRS and RCA Input and Output connectors ensures acceptance in all installations.
CONSTANT-Q DETAILS
Traditional equalizer designs present a problem in that the
filter’s level control is actually a part of the filter. Consequently, whenever the slider is moved, the bandwidth
changes. The output exhibits the desired bandwidth only at
full boost or cut. It degrades to as much as two octaves at
moderate slider settings. Responding to this dilemma, Rane
developed a topology ensuring constant filter bandwidth
(“Q”) at all slider positions.
Another important advantage of constant bandwidth is
reduction of adjacent filter overlap. Conventional designs
exhibit excessive overlap at moderate slider settings. Adjusting one slider affects the adjacent neighbors, requiring
readjustments to each. Filter overlap in Rane equalizers is
dramatically less, reducing the need for constant readjustment
of adjacent sliders. This means more effective equalization in
significantly less time.
INTERPOLATING DETAILS
Today’s sophisticated acoustic measurement tools show
exact trouble spots. Often these lie between ISO centers. An
interpolating equalizer allows correction for these response
errors by producing a smooth peak or dip between (i.e., it
interpolates, or inserts between) any two adjacent frequency
sliders when they are raised or lowered the same amount.
Non-interpolating responses exhibit a slight dip (ripple) under
similar conditions.
Data Sheet-3
ME 60
microGRAPHIC EQUALIZER
Rear Panel
Architectural Specifications
The graphic equalizer shall be a two channel model of
interpolating constant-Q design to minimize interactions
between adjacent bands, and shall occupy two rack spaces
(2U). Each channel shall have thirty (30) frequency bands
located on standard ISO center frequencies. Each band shall
have a bandwidth of 1/3-octave. A detented and positively
grounded 0 dB point shall be provided on 20 mm linear
sliders with dust dams.
Low and high cut filters shall be provided with 12 dB/
octave slopes and adjustable corner frequencies. A rotary
overall level control shall be provided with a range from off
to +8 dB of gain when used in balanced mode.
The inputs shall be active balanced/unbalanced designs
terminated with XLR, ¼" TRS (tip-ring-sleeve), and RCA
connectors. The outputs shall be active balanced/unbalanced
with equal output impedances terminated with XLR, ¼" TRS,
and RCA connectors. RFI filters shall be provided. The unit
shall provide a passive bypass feature for each channel
requiring no power to operate. LEDs shall be provided to
indicate overload and bypass conditions.
The 120 VAC 50/60 Hz model shall be UL and cUL listed
and operate by means of its own built-in power supply. The
230 VAC 50 Hz model shall meet the European requirements
for EMC and safety and carry the CE mark of compliance.
The unit shall be constructed entirely from cold-rolled steel.
The unit shall be a Rane Corporation ME 60
microGraphic Equalizer.
Available Accessories
• SC 3.5 Security Cover
References
1. D. Bohn, “Constant-Q Graphic Equalizers,” Rane Note 101, (1982).
2. D. Bohn, “A New Generation of Filters,” Sound and Video Contractor, vol. 2, pp. 36-39 (Feb. 1984).
3. T. Pennington, “Constant-Q,” Studio Sound, vol.27, pp. 82-85 (Oct. 1985).
4. D. Bohn, “Constant-Q Graphic Equalizers,” J. Audio Eng. Soc., vol. 34, pp. 611-626 (September 1986).
5. D. Bohn, “Exposing Equalizer Mythology,” Rane Note 115, (1986).
6. D. Bohn, “Operater Adjustable Equalizers,” Rane Note 122, (1990).
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL (425)355-6000 FAX (425)347-7757 WEB http://www.rane.com
Data Sheet-4
All features & specifications subject to change without notice. DOC 103106 PN 06709 2-98
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