Carvin EQ2015, EQ2030 Owner's Manual
MODEL EQ2015 SPECS:
Input Type: Balanced and unbalanced via male
and female XLR connector or 1/4”
phone jack
Input Impedance: 20 KΩ balanced
10 KΩ unbalanced
Maximum Input Level: +20 dBv balanced or unbalanced
Output Type: Balanced and unbalanced via male
XLR connector or 1/4” phone jack
Output Impedance: 600 Ω balanced
Maximum Output Level:
Unbalanced: +20 dBv (7.8 Vrms) into a 600 Ω
load or greater
Balanced: +26 dBv (15.6 Vrms) into a 600 Ω
load or greater
Input Gain Control: +6 dB to full attenuation
Boost Cut: ±15 dB, +20 dBv into 600Ω
Center Frequencies: 25,40,63, 100, 160, 250, 400, 630,
1k,1.6k, 2.5k, 4k, 6.3k, 10k,
and 16 kHz ± 5%
Filter Type: Active bandpass filters (no inductors)
Frequency Accuracy: ±5% of nominal center frequency
Frequency Response
(with all sliders centered): ±1 dB, 10 Hz to 45 kHz
Bandwidth (-3 dB points): 7 Hz -85 kHz
Harmonic Distortion: <.01% THD, 20 Hz to 20 kHz
Noise (unweighted,
20 kHz bandwidth): 104 dB below full output
Slew Rate: 9 volts per microsecond
Power Requirements
US Model: 120 VAC, 60 Hz, 1/4 A, 5x20 fuse
Export Model: 230 VAC, 50 Hz, .125 A, 5x20 fuse
Package: 2 rack spaces
Dimensions: 19"W x 6"D x 3 1/2"H
Net Weight: 10 lbs.
CARVIN ENGINEERING DATA
OPERATING MANUAL
The EQ2015 & EQ2030 are professional 2/3 and 1/3 octave graphic
equalizers suitable for recording, sound reinforcement, guitar and bass
rigs, or home audio applications. Both units feature pro sound performance from extended frequency response, wide dynamic range, and
low noise operation. Both offer large precision sliders with “sure-grip”
rubber boots, 15db of boost and cut per frequency, low interaction
between frequencies, and dual Sweepable High and Low cut filters. The
EQ2015 & EQ2030 are built to rugged specs for high reliability under
continuous use providing years of professional service.
INTERFACE & OPERATION
The EQ2015 & EQ2030 can be inserted into the audio signal path at any convenient point where there is a nominal “line level” signal. Never connect the speaker
output of an amplifier to the EQ2015 or EQ2030 as damage to both units may
occur. Balanced low impedance XLR w/ground lift and balanced/unbalanced 1/4”
connections are provided allowing the EQ2015 & EQ2030 to be interfaced with
professional audio equipment (with the proper cables). See Fig. 1.
RECORDING STUDIO APPLICATIONS
The EQ2015 & EQ2030 have many uses in the studio environment. They
can be used to balance and “flatten” the control room monitors, eliminate feedback in the studio mains, or to EQ individual recorded channels.
SOUND REINFORCEMENT
The EQ2015 & EQ2030 are the ideal tools for solving many live sound reinforcement problems. The most obvious use would be for eliminating feedback and fine tuning the main house speakers or the stage monitor speakers.
Typically the EQ2030, with its fine 1/3 octave adjustments would be used for
the monitors, although the EQ2015 could be used in situations where tone control, not feedback elimination, was the main objective. Both units are excellent for optimizing the house PA system. Typically the EQ2015 is sufficient
for the PA mains, although in rooms with major EQ problems, the extra fine
tuning abilities of the EQ2030 may be necessary.
GUITAR & BASS AMPS
Guitar and bass players can benefit from the EQ2015 & EQ2030 by integrating
them into their rigs between the pre-amp and power amp interrupt jack for
extra tone control. Utilizing A/B boxes, the EQ’s can be used like extra channels for unlimited tonal flexibility.
MODEL EQ2030 SPECS:
Input Type: Balanced and unbalanced via male
and female XLR connector or 1/4”
phone jack
Input Impedance: 20 KΩ balanced
10 KΩ unbalanced
Maximum Input Level: +20 dBv balanced or unbalanced
Output Type: Balanced and unbalanced via male
XLR connector or 1/4” phone jack
Output Impedance: 600 Ω balanced
Maximum Output Level:
Unbalanced: +20 dBv (7.8 Vrms) into a 600 Ω
load or greater
Balanced: +26 dBv (15.6 Vrms) into a 600 Ω
load or greater
Input Gain Control: +6 dB to full attenuation
Boost Cut:
± 15 dB, +20 dBv into 600Ω
Center Frequencies:
25,31.5, 40, 50, 63, 80, 100, 125,
160, 200, 250, 315, 400, 500, 630,
800, 1k,1.25k, 1.6k, 2k, 2.5k, 3.15k,
4k, 5k, 6.3k, 8k, 10k, 12.5k, 16 k
and 20k ± 5%
Filter Type: Active bandpass filters (no inductors)
Frequency Accuracy: ±5% of nominal center frequency
Frequency Response
(with all sliders centered):
±1 dB, 10 Hz to 45 kHz
Bandwidth (-3 dB points): 7 Hz -85 kHz
Harmonic Distortion:
<.01% THD, 20 Hz to 20 kHz
Noise (unweighted,
20 kHz bandwidth): 104 dB below full output
Slew Rate: 9 volts per microsecond
Power Requirements
US Model: 120 VAC, 60 Hz, 1/4 A, 5x20 fuse
Export Model: 230 VAC, 50 Hz, .125 A, 5x20 fuse
Package: 3 rack spaces
Dimensions:
19"W x 6"D x 5 1/4"H
Net Weight: 13 lbs.
76-20300 197
12340 World Trade Drive, San Diego, CA 92128
(800) 854-2235
www.carvin.com
HOME AUDIO
The EQ2015 & EQ2030 are excellent equalizers for home audio use. Their highend professional features and specs allow them to integrate easily into top quality home set-ups. The units can be connected to an open tape monitor loop on
an integrated pre-amp/amplifier or between the pre-amp and power amp in systems with separate components providing the ultimate control in your favorite listening room.
MICRO TOROID SUPPLY
Pure DC is generated from the built-in Micro Toroid power supply which features
precision 7815 and 7915 voltage regulators. Now you can go anywhere and never
have to worry about the EQ2015 & EQ2030 giving you their exact specifications
because voltage tolerances are held to within .001%.. The big feature in this power
supply is the precision wound Toroid transformer that gives unsurpassed rejection
of noise and hum. You can place the EQ2015 & EQ2030 over sensitive gear and
not be concerned about injecting hum or noise from a standard transformer. CARVIN
has spared no expense to achieve studio quality performance.
EQ2015
For your records, you may wish to record the following information.
Serial No._____________________ Invoice Date_______________
EQ2030
RECEIVING INSPECTION—read before getting started
INSPECT YOUR UNIT FOR ANY DAMAGE which may have occurred during shipping. If any
damage is found, please notify the shipping company and CARVIN immediately.
SAVE THE CARTON & ALL P ACKING MATERIALS. In the event you have to re-ship your unit,
always use the original carton and packing material. This will provide the best possible protection during shipment. CARVIN and the shipping company are not liable for any damage caused
by improper packing.
SAVE YOUR INVOICE. It will be required for warranty service if needed in the future.
SHIPMENT SHORTAGE. If you find items missing, they may have been shipped separately.
Please allow several days for the rest of your order to arrive before inquiring.
RECORD THE SERIAL NUMBER on the enclosed warranty card or below on this manual
for your records. Keep your portion of the card and return the portion with your name and
comments to us.
EQ2015 DUAL 2/3 OCTAVE EQUALIZER
EQ2030 DUAL 1/3 OCTAVE EQUALIZER
INTERF ACE AND OPERATION
In general, the EQ2015 & EQ2030 graphic equalizers can be inserted into the audio
signal path at any convenient point where there is a nominal “line level” signal. About
the only signals with which it would not be appropriate to use the EQ2015 & EQ2030
would be very low level signals (i.e. microphone lines before the mic preamp) or
very high level signals (i.e. loudspeaker lines). The EQ2015 & EQ2030 will provide
excellent results when used with signals and input/output impedances normally found
in recording studios, sound reinforcement systems, or home Hi-Fi. Further details
on installation and operation are provided below for various applications. Please
refer to the section that most closely matches your application.
RECORDING STUDIO APPLICATIONS
The EQ2015 & EQ2030 have a variety of applications in the recording studio.
However, the primary application will likely be to precisely correct frequency response
errors in the control room monitoring system. In order to create a well balanced
product, it is essential that a professional recording studio utilize an audio monitoring system that is a “neutral” or “colorless” as possible. The EQ2015 & EQ2030
were specifically designed for the task of removing color, or “neutralizing” audio
monitoring systems. An appropriate point at which to insert the EQ2015 & EQ2030
in the listening chain is between the mixer’s control room outputs and the inputs
of the stereo power amps. Input and output connections to the EQ2015 & EQ2030
can be made by way of either the balanced XLR connectors or the balanced/unbalanced 1/4” phone jacks.
If the EQ2015 or the EQ2030 is to be used for a variety of recording applications
rather than as a dedicated monitor equalizer, then the best place to interface it is the
central patch bay. By making the EQ’ s inputs and outputs available at the patch bay ,
the EQ can be patched into input or output channels of the mixer as desired. In
addition to the infinite variety of audio frequency response contours that can be created using the unit’s sliders, signals outside the audio band can be controlled by
using in the low cut and high cut filters.
SOUND REINFORCEMENT APPLICATIONS
There are many applications for the EQ2015 & EQ2030 in professional sound reinforcement or “PA” systems. The most popular use of the EQ2015 & EQ2030 is to
provide 2/3 & 1/3 octave equalization of the main or monitor speaker systems to
correct response errors in the speakers compensate for room acoustics and control feedback. For feedback control, a good technique is to raise the level of the
system to the threshold of the threshold of feedback (i.e. to the point where the systemjust begins to ring) and then locate the slider that controls the “ringing” frequency.
Reduce the level of that slider until the ringing is eliminated. Again increase the
overall monitor level until the system just begins to ring (at a new frequency) and
repeat the sequence until 3 or 4 frequency are ringing together. At this point you
have reached your lowest feedback setting.
An appropriate place to insert the EQ into the system is between the outputs of
the mixer or monitor main and the inputs of the power amplifier. In addition to using
the EQ2015 & EQ2030 to equalize loudspeaker frequency response, the units can
be used as a program equalizer on individual channels or subgroups to establish
optimum tonal balance. In the latter case the EQ would be patched into the appropriate channel or subgroup at the console.
The low cut sweepable filter constitutes an excellent sub-sonic filter and can provide a high degree of protection to the woofers in a sound system for unexpected
sub-sonic transients (such as might result from a dropped microphone, intermittent connection, or other audio hazzards associated with live sound). The low-cut
filter will also help conserve amplifier power and reduce woofer cone excursion so
that higher sound pressure levels can be achieved before running out of amplifier
headroom. A recommended setting is 35 Hz. The hi-cut filter can provide a degree
of protection to high frequency horns or tweeters from inaudible ultrasonic oscillations in system components ahead of the EQ2015 & EQ2030. A recommended
setting is 20k Hz.
HOME HI-FI APPLICATION
The EQ2015 & EQ2030 are excellent equalizers for home Hi-Fi use. Those audiophyles who appreciate professional grade audio equipment will appreciate the value
these equalizers represent in addition to the professional quality they provide.
The primary application of a 2/3 & 1/3 octave graphic equalizer in a home Hi-Fi
system will likely be to establish a highly accurate frequency response in the listening room. In this case the equalizers can be interfaced at the tape monitor of
the systems “receiver” or “pre-amp”. The equalizer can also be inserted between
the stereo pre-amp and stereo power amp of a system with separate pre and power
amps. For the case of a typical Hi-Fi stereo receiver the left and right “tape outputs”
would be connected (by way of an appropriate cable) to the inputs (most likely by
way of the 1/4” phone jacks). The outputs of the units could then be connected
back into the left and right “tape inputs” of the stereo receiver. Depressing the “tape”
switch on the receiver would then connect the EQ into the system.
Other home Hi-Fi applications for the EQ2015 & EQ2030 are those relating to home
recording. Connecting the EQ between the preamp output and the tape recorder
input allows equalization of the material being recorded. This configuration could
be used to make tape dubs of older recordings with equalization according to your
own musical taste.
Figure 1.
1642
MONITOR POWER AMP
LEFT & RIGHT
MAIN SPEAKERS
MONITOR SPEAKERS
MAIN EQ 2030
CHANNEL TWO
10K
6K 45K
35K
25K
20
10 230
120
50
EQ IN
dB
+6
0
GAIN
PEAK
HI CUT
Hz
LOW CUT
Hz
0dB
+15
–15
CHANNEL ONE
ON
OFF
EQ2015
25 40 63 100 160 250 400 630 1K 1.6K2.5K 4K 6.3K10K 16K
10K
6K 45K
35K
25K
20
10 230
120
50
EQ IN
dB
+6
0
GAIN
PEAK
HI CUT
Hz
LOW CUT
Hz
0dB
+15
–15
25 40 63 100 160 250 400 630 1K 1.6K2.5K 4K 6.3K10K 16K
–3
+3
–6
+6
–3
+3
–6
+6
EQ2030
ON
OFF
CHANNEL TWO
0dB
+15
–15
25 31.5 40
–3
+3
–6
+6
50 63 80 100 125 160 200 250 315 400 500 630 800 1K 1.25K 1.6K 2K 2.5K 3.15K 4K 5K 6.3K 8K 10K 12.5K 16K 20K
0dB
+15
–15
25 31.5 40
–3
+3
–6
+6
50 63 80 100 125 160 200 250 315 400 500 630 800 1K 1.25K 1.6K 2K 2.5K 3.15K 4K 5K 6.3K 8K 10K 12.5K 16K 20K
EQ IN
10K
6K 45K
35K
25K
20
10 230
120
50
dB
+6
0
GAIN
PEAK
HI CUT
Hz
LOW CUT
Hz
CHANNEL ONE
EQ IN
10K
6K
45K
35K
25K
20
10
230
120
50
dB
+6
0
GAIN
PEAK
HI CUT
Hz
LOW CUT
Hz
MONITOR EQ 2015
MAIN
LEFT / RIGHT
OUTPUTS
MONITOR 1/2
OUTPUTS
MIXER
INPUTS
MAIN POWER AMP
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