CLASSIC SERIES
ARREL Audio CLASSIC SERIES, conceived for the professional user, combines high reliability,
rugged design, audio quality, versatility and ease of use. The CLASSIC Series has been
conceived mostly for small-medium recording studios and live audio where simple and intuitive
front panels are important and where the control knobs must immediately respond to obtain a fast
set-up of the audio signal. Moreover special components and topologies guarantees a very
large dynamic range important in live situations. ARREL Audio systems are designed and
hand-assembled in Italy with minimum cabling to obtain the best mechanical performances and
the minum degradation of the audio signal. ARREL audio devices are designed utilizing mostly
through-hole tecnhnology which provides better performances when compared to surface mount
technology. Moreover, no custom electronic components are used in ARREL Audio units.
REAL Innovation
CL-122 Four Band Parametric Equalizer
LO
AUDIO
MID 1
MID 2
HI
LO
AUDIO
PARAMETRIC
EQUALIZER
PARAMETRIC
EQUALIZER
CL 122
CL 122
6
EQ
OFF
2
0
2
6
10
10
14
PEAK
0
+4
dB
-10
60
INPUT
0
2
6
80
6
400
dB
800
100
Hz
6
EQ
OFF
3K
6K
10K
Hz
dB
0
+4
14K
16K
20K
2.5K
2K
2
-10
Hz
6
HI
dB
800
100
6
2
CL - 122
6
10
14
dB
3K
ON
14
4K
3K
4K
5K
500
Hz
0
10
14
600
1000
2
6
1K 1.5K 2K
800
700
500
600
150
200
2
10
14
400
300
200
100
0
2
10
14
dB
140
160
20
6
10
14
25
INPUT
2
10
80
60
0
2
6
14
40
30
-6
+10
Hz
6
10
14
PEAK
8K
0
2
10
14
4K
3K
4K
5K
500
dB
MID 2
AUDIO
6
10
14
600
1000
2
10
14
1K 1.5K 2K
800
700
500
600
0
2
6
10
14
150
200
2
10
14
300
200
100
140
160
Hz
dB
0
2
6
10
14
25
20
2
10
14
40
30
-6
+10
6
MID 1
6K
8K
14K
16K
20K
2.5K
2K
Hz
10K
Hz
POWER
The ARREL Audio CL-122 is an advanced 2-channel four bands equalizer developed to meet the demands of professional recording and
mastering engineers. The CL-122 features 4 parametric bands. Special analog design techniques have been used for precise control of
the sound structure down to the minimum details.
The CL-122 is based on Livio Agentini’ s patented single-stage parallel filters. This innovative phase coherent EQ design offers the lowest
distortion/noise specifications, not available on similar units on the market.
The CL-122 input section provides a continuous input level control in the ± 10 dB range. A peak level detector circuit indicates when the
output level is -6 dB with respect to the saturation level. The equalizer can be excluded by a true-bypass button.
The filtering section has 4 bands, LO, MID1, MID2, HI. For each band three rotary knobs controls the central frequency, the gain and the
Q.
The Emphasis/De-Emphasis rotative knob allows a very accurate control of the equalization in the range ± 14 dB. The Q is controlled by
a potentiometer.
The CL-112 is a 2U rack module equipped with the power supply and two CL-122 equalizer modules. Each module is completely
independent and can be inspected separately. Chassis of the Classic Series can be configured with different modules of the Classic
Series (for example a unit composed by a mic-preamplifier and a single channel equalizer implement an advanced channel strip).
The CL-122 is an innovative and flexible equalizer, ready to take its place in any high profile recording, mastering broadcast and live
activities.
CL-123 Channel Strip
MICRO
4
5
6
3
2
GAIN
10
0
10
14
dB
60
80
40
30
6
14
REV
LO
2
6
12 KHz
10
9
0
ON
80 Hz
8
1
AUDIO
2
7
140
160
25
20
200
Hz
2
100
0
MID 1
2
6
6
300
400
200
10 150
10
14
14
dB
800
100
1000
Hz
2
500
600
0
MID 2
2
6
1K
800
700
6
10
10
14
14
dB
1.5K
2
2K
600
4K
500
5K
Hz
0
HI
2
6
3K
10
10
14
14
dB
6K
8K
4K
6
3K
-18 -12
-6
0
+6
-3
14K
2.5K
+3
16K
2K
20K
Hz
EQ
OFF
DISPL
POST
INS
POST
INS
OFF
-6
+6
MASTER TRIM
LINE
48 V
OUT
0
10K
PHASE
CL-123
INSERT
SEND
RETURN
The ARREL Audio CL-123 channel strip unit, is composed by a high quality mic-line preamplifier, a four band parametric equalizer, a level
metering system and a flexible insert return. The preamplifier architecture is based on two high dynamic range gain stages to avoid any
saturation and the best possible linearity. The CL-123 extended input dynamic range avoids the necessity of the input pad and the gain is
controlled by a single large knob. The absence of the input pad means better sonic performances. The Line Input (unbalanced) is easily
accessible from the front panel by a 1/4"' TRS jack. The insertion of the Line In jack disconnects the mic input.
The channel strip contains a special circuit that allows the connection of microphones even if the unit is turned on with the Phantom
Power activated (in any case we do not recommend this practice in order to protect your microphones).
CL-123 also provides a four band fully parametric EQ with High-Cut/Low-Cut filters at fixed cut-off frequencies (80 Hz / 12 kHz) which can
be activated by a switch. Each filter stage is completely excluded from the main circuit if not in use.
The emphasis/de-emphasis adjustment is based on a special circuit topology that guarantees a very linear and accurate control.
The flexibility of the CL-123 channel strip is increased by a level meter (mic-line out or equalizer out measurements) and an insert point
(send and return electronically balanced) available both on the front panel and on the back panel. The insert point can be configured
either as pre eq. or post eq. The insert jacks on the front panel deselect the outboard connected on the back panel. In this way the user
can permanently connect the most used outboard to the insert/return connectors on the back panel and, when a new outboard is
required, it can be connected by using the front panel connectors disconnecting automatically the back connected outboard. In this way
additional outboards can be easily connected with no access on the back panel.
Differently from other channel strips, the CL-123 is dedicated (due to his absolute sonic level quality) to high professional vocal recordings, classical instruments, high dynamic range instruments such as drums and percussions.
ARREL Audio, Via A. Mondadori 7, 00128 Rome, ITALY- Tel +39 06 506 2017, Fax: +39 06 5062017
Info: info@arrel-audio.com
Web: www.arrel-audio.com
Support: http://www.arrel-audio.com/support
CLASSIC SERIES
CL-125/2 Dual Mic-Line Preamplifier
CL-125/4 Quad Mic-Line Preamplifier
5
4
-18 -12
6
3
7
2
8
1
-6
0
+6
4
1
GAIN
7
8
1
48 V
PHASE
5
4
-18 -12
6
-6
LINE
2
5
48 V
-18 -12
-6
0
2
LINE
+6
8
GAIN
-18 -12
6
3
48 V
+6
-18 -12
6
3
48 V
2
0
+6
ON
CH - 4
8
CL - 125/4
9
0
LINE
PHASE
-6
7
1
10
GAIN
5
4
CH - 3
9
0
LINE
PHASE
0
8
1
10
-6
7
2
9
0
5
4
CH - 2
7
LINE
PHASE
REAL Innovation
CL - 125/2
PHASE
6
1
10
GAIN
48 V
3
9
0
+6
0
10
4
CH - 1
8
1
GAIN
+6
0
7
-6
2
9
0
10
3
AUDIO
-18 -12
6
2
9
0
5
3
AUDIO
10
GAIN
48 V
LINE
PHASE
POWER
The ARREL Audio CL-125/2 CL-125/4 dual and quand mic-line preamplifier architecturese is based on two high dynamic range gain
stages to avoid saturation. Even if the input stage of the CL-125/2 could accept input signals up to +20 dBu, a special protection circuit limits
the input level at +12 dBu in order to prevent any damage. The CL-125/2 extended input dynamic range avoids the necessity of the input
pad and the gain is controlled by a single large knob. The absence of the input pad means better sonic performances. In fact being it an
attenuator it introduces degradation in sound quality and the signal to noise ratio.
The CL-125/2 contains a special circuit that allows the connection of microphones even if the unit is turned on with the Phantom Power
activated (in any case we do not recommend this practice in order to protect your microphones).
The Line Input (unbalanced) is easily accessible from the front panel by a 1/4"' TRS jack. The insertion of the Line In jack disconnects the
mic input. CL-125/2 also provides High-Cut/Low-Cut filters (cut-off frequencies 12kHz and 80Hz) which can be activated by a switch.
The CL-125/2 is dedicated (due to his absolute sonic level quality) to high professional vocal recordings, classical instruments, high dynamic
range instruments such as drums and percussions. The CL-125/2 is contained in a half rack metal box.
CL-266 16 Channel Summing Mixer
0
L
1
4
PAN
5
0
R
MUTE
6
4
7
3
SOLO
8
2
1
PAN
5
1
4
PAN
R
SOLO
8
1
9
10
LEVEL
R
MUTE
SOLO
8
9
10
1
L
9
4
7
SOLO
8
R
MUTE
SOLO
8
9
10
SOLO
8
1
R
MUTE
SOLO
8
9
10
PAN
10
L
13
4
7
SOLO
8
1
R
MUTE
12
4
7
SOLO
8
1
9
10
PAN
L
SOLO
8
R
MUTE
14
4
7
SOLO
8
1
9
10
PAN
7
L
R
MUTE
16
4
7
SOLO
8
1
9
10
+6
-6
SEND
SEND
RETURN
RETURN
+6
RIGHT
10
INSERT
INSERT
0
6
3
LEFT
SOLO
9
0
2
LEVEL
-6
LEVEL
PAN
0
MUTE
0
8
1
10
5
R
6
3
0
6
3
L
5
CL - 266
0
2
9
0
2
LEVEL
15
LEVEL
PAN
0
MUTE
4
7
1
10
5
R
6
3
0
6
3
L
5
0
2
9
0
2
LEVEL
MUTE
LEVEL
PAN
0
R
6
3
10
5
0
2
9
4
7
1
L
5
0
6
3
LEVEL
11
4
7
0
2
0
MUTE
LEVEL
PAN
5
R
6
3
10
L
8
0
2
9
4
7
1
PAN
5
0
6
3
LEVEL
MUTE
6
3
0
2
0
R
LEVEL
PAN
5
0
2
10
L
6
4
7
1
PAN
5
0
6
3
LEVEL
SOLO
9
0
2
0
4
7
1
L
7
LEVEL
PAN
5
MUTE
8
10
L
4
4
7
2
0
MUTE
R
6
3
0
6
3
PAN
5
0
2
LEVEL
0
L
SOLO
9
0
L
5
4
7
8
10
5
MUTE
6
3
LEVEL
2
R
2
9
0
AUDIO
L
3
0
L
PAN
5
R
MUTE
6
4
7
3
SOLO
8
2
1
9
0
MUTE L
MUTE R
SOLO
10
LEVEL
5
6
PHONES
7
3
MONO
8
2
1
9
0
10
MONITOR
SUMMING MIXER
The ARREL Audio CL-266 is a 16-channel summing mixer conceived from the demands of the digital recording technology. When used
as a summing mixer, the CL-266 offers a series of distinctive features not available in any other comparable unit on the market. The
signal level is controlled by a potentiometer over a 300° angle range (14 dB range , -12dB to +2dB) that permits a very easy set up of the
gain. In this way, an easy and precise level recall can be obtained even without the use of stepped gain controls.
Each channel can be accessed by two different input connectors (DB25 and XLR) allowing hassle-free connections to professional DAW
via a standard 8 channel multicore cable (DB25 to DB25) as well as single-channel external input device insertion via an XLR cable.
Following the summing stage is an insert point for connecting external units such as equalizers and compressors that can be by-passed
by pressing the insert button on the front panel. The insert is electronically balanced (send and return) and can be accessed either from
the DB25 and the XLR rear connectors and via front panel jacks. This feature is particularly useful when a main external unit (connected
via the rear panel) needs to be momentarily replaced by another device.
The use of the send/return front panel jacks automatically disables the device connected on the back panel insert connectors. The send
signal on the front panel jacks is always available allowing the set-up of the levels for the outboard connected by the front panel jacks.
The connection of the return cable will exclude the main outboard connected to the DB25 connector on the back panel. Master levels are
set with two separate (L/R ±6dB) potentiometers. Due to the fact that Solo and Master levels can be significantly different, the monitor
section has two separate and independent controls: a main master level control and a secondary solo level control (a led indicates that
solo is activated). The solo mode remains active even when the channel is muted. (signal is taken after the pan control, allowing an exact
stereo image positioning). Used in conjunction with mic preamplifiers, the CL-266 is the ideal mixer for engineers working in studios not
equipped with a classic analog console who do not want to use digital mixers. For this reason, a different CL-266 version characterized
by a level control range of -20dB/+6dB is also available.
CL-266 is dedicated (due to his absolute sonic level quality) to high professional vocal recordings, classical instruments, high dynamic
range instruments such as drums and percussions.
ARREL Audio, Via A. Mondadori 7, 00128 Rome, ITALY- Tel +39 06 506 2017, Fax: +39 06 5062017
Info: info@arrel-audio.com
Web: www.arrel-audio.com
Support: http://www.arrel-audio.com/support