Ams Neve 8051 Users Manual 8051_user.vp

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8051 5.1 Compressor

User Guide

AMS
NEVE

8051
5.1 Compressor
User Guide
527-357
Issue 2

© 2005 AMS Neve Ltd own the copyright of all
information and drawings contained in this manual which
are not to be copied or reproduced by any means or
disclosed in part or whole to any third party without
written permission.
HEAD OFFICE

As part of our policy of continual product improvement,
we reserve the right to alter specifications without notice
but with due regard to all current legislation.

AMS NEVE LTD • BILLINGTON ROAD • BURNLEY
LANCS BB11 5UB • ENGLAND
TELEPHONE: +44 (0) 1282 457011 • FAX: +44 (0) 1282 417282

LO N D O N O F F I C E
TELEPHONE: +44 (0) 20 7916 2828 • FAX: +44 (0) 20 7916 2827

Disclaimer: The information in this manual has been
carefully checked and is believed to be accurate at the
time of publication. However, no responsibility is taken by
us for inaccuracies, errors or omissions nor any liability
assumed for any loss or damage resulting either directly or
indirectly from use of the information contained within it.

Issue 2

NORTH AMERICAN OFFICES
AMS NEVE INC., NEW YORK
TEL: +1 (212) 965 1400 • FAX: +1 (212) 965 9306
AMS NEVE INC., HOLLYWOOD
TEL: +1 (818) 753 8789 • FAX: +1 (818) 623 4839

e-mail: info@ams-neve.com
http://www.ams-neve.com

8051 5.1 Compressor

User Guide

Contents
Introduction

1

Dimensions

2

Rack Mounting and Cooling

2

Power Requirements

2

Mains Supply
Rear Panel Connectors

3

Compressor Controls

4

LFE Filter (Filter to Channel)

4

Bypass

5

Sidechain Link

6

Sidechain Filter

6

Control Link

7

SC Trims and Threshold

8

EXT Control

9

Threshold

10

Gain Makeup

10

Ratio

10

Attack

11

Recovery

11

Gain Reduction Meters

11

Key Input

12

Key Filter

12

Bias Control

12

Output Level

12

Power

12

Mastering Compressor Controls (AM5292)

13

8051 Compressor - 88R(S) Console mounted
I/O Wiring (AM5052 & AM5265)

Issue 2

2

14
15

Specifications

16

8051 Block Diagram

17

Page ii

8051 5.1 Compressor

User Guide

Introduction

T

he 8051 is an analogue compressor that provides six transformer balanced audio paths
complemented by two sidechains and a key input. Input and output to the sidechains is assignable
to and from the six channels. Assignable LFE filters on the input and sidechains along with the key
input provide integrated bass management.
Flexible sidechain routing, trimming and filtering make this a powerful and responsive tool for
surround mixing.
The 8051 uses the same feedback topology as the 33609 compressor and includes the same
transformers, diode-bridge gain control and discrete power amplifiers in the audio path.

8051 5.1 Compressor

Issue 2

Page 1

8051 5.1 Compressor

User Guide

Dimensions
Units

U

Depth
mm (inches)

Height
mm (inches)

Approx. Weight
kg (lbs)

8051 Compressor
(AM4851 and AM5292)
not including mains plug

3

500 (20)

135 (5.25)

10.5 (23)

Rack Mounting and Cooling
The rack units should be installed in a 19" cabinet with access to the front and rear.
No specific air conditioning is required for the racks, provided that there is a free flow of air through
the rack from front to back, and that the ambient air is maintained below 30 degrees centigrade.
Therefore the racks may be stacked.

Power Requirements
8051 Units
Rated Voltage

100-250V AC

Rated Frequency

47-63 Hz

Rated Current

.25A at 250V

Primary Protection Fuse:
Operating Voltage

250/110V

Fuse Rating and Type

T1.6A/T1.6A A/S Ceramic

Location

Rear Panel IEC Mains Connector

Mains Supply
The power supply unit is a universal input type therefore no mains operating voltage setting is
required.
The CH (chassis) and 0V are linked externally.
See the rear panel layout for AM4851 & AM5292.

Issue 2

Page 2

8051 5.1 Compressor

User Guide

Rear Panel Connectors
-

Mating connectors are not supplied with these units.

CONTROL
VOLTAGE I/O

KEY INPUT

INPUT 6

INPUT 5

INPUT 4

INPUT 3

INPUT 2

INPUT 1

PUSH

PUSH

PUSH

PUSH

PUSH

PUSH

PUSH

WARNING
DISCONNECT MAINS LEAD
TO ISOLATE UNIT.
NO USER SERVICEABLE
PARTS INSIDE
HAZARDOUS VOLTAGES INSIDE
REFER TO MANUALS

CHASSIS

INTERNAL
0V

PLEASE SEE
MANUAL

OUTPUT 6 OUTPUT 5 OUTPUT 4 OUTPUT 3 OUTPUT 2 OUTPUT 1

FUSE 1.6A A/S CERAMIC
INPUT VOLTAGE 100-250V AC
INPUT FREQUENCY 47-63Hz

CONTROL VOLTAGE I/O - 15 Pin D-Type
KEY INPUT - XLR Socket
INPUT 1-6 - XLR Socket
OUTPUT 1-6 - XLR Plug

-

These connectors apply to both the Standard and Mastering Compressor (AM4851 &
AM5292).

-

For I/O wiring on 88R(S) console mounted compressors (AM5052 & AM5265) see page 15 .

Issue 2

Page 3

8051 5.1 Compressor

User Guide

Compressor Controls
80
Hz

100

FILTER TO CHANNEL

120

1

IN/OUT
0

15

1/2

15

5/6

0

1

3

15

15

4

15

100

2

A
B

3
3

A
B

4

1

3

2

EXT
A
CTRL

1

EXT
B
CTRL

1

A
B

2
2

A
B

3

5

6

A
B

3

A
B

4

A
B

0

4

8ms

8

5
5

A
B

6
6

5

5

A
B

6

6::1
6:1

.8s

.1s

16

dB

IN/OUT

4

A
12

8

16

12

B

20

1..5s
1.5s

.2s
.2s

ATTACK
max

12

0

-20
100Hz

+1
16
+16

THRESHOLD dBu

3s

+1
16
+16

RATIO
4

B

0

A

RECOVERY

8

6ms

4ms
12
1
2

8ms

2ms

4

+20
2:1

12

8

16

12
-20

8

4

-10
4

MAKE-UP
GAIN dB

3:1

.4s

4:1
6::1
6:1

.8s

max

.1s

12

DISCRETE
MULTI-CHANNEL
COMPRESSOR

16

0

OUTPUT LEVEL dB

20

dB

1..5s
1.5s

.2s
.2s

ATTACK

1.5:1

8051

A/ B
BIAS

16ms

16
0

B

GAIN REDUCTION

8
8

B

.4s

4:1

0

B

A

3:1

1.5:1

THRESHOLD dBu

6
6

8

0

8

SIDE
CHAIN
SEL

12
-20

4

5

MAKE-UP
GAIN dB

8

16

A

+20
2:1

KEY I/P

GAIN REDUCTION
16ms

4

-10
4

12

4
4

6ms

4ms
2ms

8

4
4

8
12
1
2

4

CONTROL LINK

120

Neve

B

2

0
4

16

SIDECHAIN FILTER

IN/OUT
80
Hz

A

4

A

6

SIDECHAIN LINK

1

0

SC TRIMS dB

3

2

M

15

1
15

5

4

BYPASS

0

MST

15

3

2

POWER

3s

+1
16
+16

THRESHOLD dBu

RATIO

-5
-5.5
5.5

RECOVERY

0

LFE Filter (Filter to Channel)
80
Hz

A 12dB/octave low-pass filter can be assigned to
any one channel. This filter is applied directly to the
input before the relay-bypass point, and its -3dB
frequency is selectable from 80, 100 or 120Hz.

100

FILTER TO CHANNEL

120

1

IN/OUT
0

15

1/2

15

5/6

0

1

3

15

SC TRIMS dB

4

15

100

Issue 2

4

5

6

A
B

2
2

A
B

3
3

A
B

4
4

A
B

5
5

A
B

6
6

A
B

1

3

2

5

4

6

CONTROL LINK

120

Neve

6

SIDECHAIN FILTER

IN/OUT
80
Hz

5

SIDECHAIN LINK

1

0

15

3

2

M

15

1
15

4

BYPASS

0

MST

15

3

2

EXT
A
CTRL

1

EXT
B
CTRL

1

A
B

2
2

A
B

3
3

A
B

4
4

A
B

5
5

A
B

6
6

A
B

Page 4

8051 5.1 Compressor

User Guide

Bypass
All channels have relay bypass. Bypass is from the
output of the LFE filter to the input of the Output
Level Control *.

80
Hz

100

FILTER TO CHANNEL

120

1

IN/OUT
0

15

1/2

15

5/6

0

1

3

15

SC TRIMS dB

4

15

100

4

5

6

A
B

2
2

A
B

3
3

A
B

4
4

A
B

5
5

A
B

6
6

A
B

1

3

2

5

4

6

CONTROL LINK

120

Neve

6

SIDECHAIN FILTER

IN/OUT
80
Hz

5

SIDECHAIN LINK

1

0

15

3

2

M

15

1
15

4

BYPASS

0

MST

15

3

2

EXT
A
CTRL

1

EXT
B
CTRL

1

A
B

2
2

A
B

3
3

A
B

4
4

A
B

5
5

A
B

6
6

A
B

If a channel routed to a sidechain is bypassed, its connection to the sidechain is maintained. This
means that other channels controlled by that sidechain are unaffected and allows a channel to
control others without being compressed itself (as though it were another key input).
Two bypass modes are available, single or master. In single mode each switch bypasses its
respective channel. In master mode all channels are controlled together from the channel 1 bypass
button.
Master mode is toggled by pressing and holding the channel 1 bypass switch and is indicated by the
MST LED to the left of channel 1 being lit. If individual channels are placed in Bypass mode, the
Master Bypass function then becomes a Group Bypass control for the remaining channels.

-

* In Master Mode individual channels can be deselected from the master group and will remain
in local bypass indicated by permanently lit bypass buttons.

-

* The elements outside the bypass loop are designed to be audibly transparent. Typical
distortion in bypass is <0.0008% at 1kHz, typical 20Hz-20kHz band noise is <-90dBu.

Issue 2

Page 5

8051 5.1 Compressor

User Guide

Sidechain Link
The sidechain link buttons route audio from each channel's sidechain audio path into one or both of
the sidechain timing circuits. If a single channel's SC LINK A or B button is pressed, that channel will
behave as a mono compressor.
If another channel is then linked to the same sidechain, the timing circuit responds to whichever
channel is larger at any moment (taking into account the setting of the SC trim controls). The
resulting control voltage is then applied equally to both channels, i.e. they behave as a stereo linked
compressor.

Sidechain Filter
Inserts a high-pass filter in the channel's sidechain path, preventing unwanted compression due to
LFE content. The response is 12dB/octave, shelves at -20dB (this is required to maintain the
sidechain's phase margin) and has a selectable -3dB frequency of 80, 100, or 120Hz.

Issue 2

Page 6

8051 5.1 Compressor

User Guide

Control Link
While the SC link buttons control the audio inputs to
each sidechain, the CV link buttons choose where
the D.C. control voltage generated by each
sidechain is routed. The CV link buttons also
determine which gain makeup control affects each
channel, in the same way that the SC link buttons
assign the threshold controls.

80
Hz

100

FILTER TO CHANNEL

120

1

IN/OUT
0

15

1/2

15

5/6

0

1

3

15

SC TRIMS dB

4

15

80
Hz

100

4

5

6

A
B

2
2

A
B

3
3

A
B

4
4

A
B

5
5

A
B

6
6

A
B

1

3

2

5

4

6

CONTROL LINK

120

Neve

6

SIDECHAIN FILTER

IN/OUT

For the output of a sidechain to be correct, it must be
fed back to the channels it is derived from. Pressing
an SC link button will therefore illuminate the
corresponding CV link button and lock it on.

5

SIDECHAIN LINK

1

0

15

3

2

M

15

1
15

4

BYPASS

0

MST

15

3

2

EXT
A
CTRL

1

EXT
B
CTRL

1

A
B

2
2

A
B

3
3

A
B

4
4

A
B

5
5

A
B

6
6

A
B

Most compressors apply gain reduction based entirely on the signal level at their inputs. A level
detector examines the input and drives an output VCA that is assumed to have a complimentary
response (a 'feed-forward' system). The 8051 uses a feedback topology, monitoring the output of
each gain cell and continually adjusting the control voltage returned to give the required gain
reduction.
This means that the control voltage linking has to follow sidechain linking to maintain a closed loop.
Once this feedback is in place the sidechain output can be linked to other channels using the
remaining unlit CV link buttons. These channels then follow the same dynamic envelope as the SC
Linked channels, but without their audio content affecting the compression.
A channel may also have control voltage linked from both sidechains. In this case the sidechain
providing the most gain reduction at any moment controls the channel, and the greater of the two
gain makeup settings will be applied.

-

The CV Link buttons are disabled unless either a channel or the key has been routed to the
associated sidechain, or when in external mode.

Issue 2

Page 7

8051 5.1 Compressor

User Guide

SC Trims and Threshold
Thresholds for each channel are determined by
sidechain path gain which is applied in two stages.

80
Hz

100

FILTER TO CHANNEL

120

0

The two main threshold controls are first assigned to
each channel with the SC Link buttons, providing a
base threshold level for each of the sidechains. The
SC Trim controls then allow threshold adjustment
on individual channels of ±15dB, irrespective of
how they are linked. The trims are grouped as two
stereo pairs (channels ½ and 5/6) and two monos
(channels 3 and 4).

1

IN/OUT

15

1/2

15

5/6

0

1

3

15

SC TRIMS dB

4

15

100

4

5

6

A
B

2
2

A
B

3
3

A
B

4
4

A
B

5
5

A
B

6
6

A
B

1

3

2

5

4

6

CONTROL LINK

120

Neve

6

SIDECHAIN FILTER

IN/OUT
80
Hz

5

SIDECHAIN LINK

1

0

15

3

2

M

15

1
15

4

BYPASS

0

MST

15

3

2

EXT
A
CTRL

1

EXT
B
CTRL

1

A
B

2
2

A
B

3
3

A
B

4
4

A
B

5
5

A
B

6
6

A
B

Once above the sidechain's threshold level, the link
button for the largest signal on that sidechain (after
the threshold gain has been applied) illuminates
red. Any signal that is above threshold and within
2dB of the dominant signal will also illuminate.

Issue 2

Page 8

8051 5.1 Compressor

User Guide

EXT Control
The EXT buttons provide an insert point in the control voltage signal, after the bias control but before
routing back to the channels.
During normal operation the control voltages generated by the sidechain are internally connected
to the CV Link switched for routing back to the channels. In EXT mode the control voltage is taken
from the rear connector instead of the sidechain outputs, allowing the unit to be slaved from a
second 8051 or 33609.

-

There is no EXT Control with 88R(S) console mounted compressors (AM5052 & AM5265).

Pin

Function

1

0V Reference

9

CV send, sidechain A

12

Remote power-on

5

CV send, sidechain B

13

CV return, sidechain B

14

CV return, sidechain A

15

24V Reference

Short to pin 12 to pin 1 to take the unit out of standby mode remotely.
CONTROL
VOLTAGE I/O

KEY INPUT

INPUT 6

INPUT 5

INPUT 4

INPUT 3

INPUT 2

INPUT 1

PUSH

PUSH

PUSH

PUSH

PUSH

PUSH

PUSH

WARNING
DISCONNECT MAINS LEAD
TO ISOLATE UNIT.
NO USER SERVICEABLE
PARTS INSIDE
HAZARDOUS VOLTAGES INSIDE
REFER TO MANUALS

CHASSIS

INTERNAL
0V

PLEASE SEE
MANUAL

OUTPUT 6 OUTPUT 5 OUTPUT 4 OUTPUT 3 OUTPUT 2 OUTPUT 1

FUSE 1.6A A/S CERAMIC
INPUT VOLTAGE 100-250V AC
INPUT FREQUENCY 47-63Hz

Issue 2

Page 9

8051 5.1 Compressor

User Guide

4

A

0

8

6ms

4ms
12
12

8ms

2ms

4

GAIN REDUCTION
16ms

16
8
4

0

8

4

-10
4

+20
2:1

MAKE-UP
GAIN dB

12

8

16

12
-20

3:1

.4s

4:1
6::1
6:1

ATTACK

1.5:1

.8s

max

.1s

16
20

3s

RATIO
4

B

0

RECOVERY

8

6ms

4ms
12
12

8ms

2ms

4

GAIN REDUCTION
16ms

16
8
4

0

4

-10
4

+20
2:1

12

8

16

12
-20

12

dB

+1
+16
16

THRESHOLD dBu

8

8

0

1..5s
1.5s

.2s
.2s

MAKE-UP
GAIN dB

3:1

.4s

4:1
6::1
6:1

ATTACK

1.5:1

.8s

max

.1s

8

12

0

1..5s
1.5s

.2s
.2s

16
20

dB

3s

+16
+1
16

THRESHOLD dBu

RATIO

RECOVERY

Threshold
Threshold is the level above which compression begins. Each
channel linked to a sidechain (using the SC Link buttons) takes
that sidechain's threshold. If a channel is linked to sidechains A
and B the lower value of the two controls is used. The threshold
controls have a range of -20dBu to +16dBu, adjustable in 2dB
steps. Each channel's threshold may be modified by up to
±15dB irrespective of its linking by using the SC Trim controls.

-

A red LED indicator is provided in each sidechain link
button. This indicates that a channel is above threshold,
and either is the dominant signal or within 2dB of the
dominant signal on that sidechain.

Gain Makeup
Gain Makeup is used to restore the average level or loudness of
a compressed signal. Linking control voltage to a channel (with
the CV Link buttons) assigns either the A or B Gain Makeup
control to that channel. If control voltage from both sidechains is
linked the larger of the two values is used; this is because the
sidechain with the greater gain reduction will be controlling the
channel. The gain applied is adjustable from -10 to +20dB in
2dB steps.

Ratio
Ratio controls the amount of gain reduction applied as the input
level increases.
At 2:1 for example, a change of 10dB at the input produces a
change of 5dB at the output. Values available are 1.5:1, 2:1,
3:1, 4:1, 6:1, and 'max' (approximately 8:1).
The 8051 has a soft-knee characteristic, and its ratio gradually
increases as the compression becomes heavier at all settings.
The numbers given should therefore be considered average
values.

Issue 2

Page 10

8051 5.1 Compressor

User Guide

4

A

0

8

6ms

4ms
12
1
2

8ms

2ms

4

GAIN REDUCTION
16ms

16
8
4

0

8

4

-10
4

+20
2:1

MAKE-UP
GAIN dB

12

8

16

12
-20

3:1

.4s

4:1
6::1
6:1

ATTACK

1.5:1

.8s

max

.1s

12

16
20

dB

3s

+1
16
+16

THRESHOLD dBu

RATIO
4

B

0

RECOVERY

8

6ms

4ms
12
1
2

8ms

2ms

4

GAIN REDUCTION
16ms

16
8
4
8

8

0

1..5s
1.5s

.2s
.2s

0

4

-10
4

+20
2:1
8

12
16

MAKE-UP
GAIN dB

3:1

.4s

4:1
6::1
6:1

ATTACK

1.5:1

.8s

max

.1s

8

12

0

1..5s
1.5s

.2s
.2s

16
20

dB

3s

12
-20

+1
16
+16

THRESHOLD dBu

RATIO

RECOVERY

Attack
This is the time between a signal 6dB above the threshold level
being applied, and the output signal falling to within 2dB of its
final level. With slower attack settings compression is more
dependant on the average signal level, while with faster settings
it is more dependant on the peaks. Setting of 2ms, 4ms, 6ms,
8ms and 16ms are available.

Recovery
If a signal 6dB above the threshold has been applied for long
enough that the output has reached its steady-state level,
recovery is the time taken for it to get to within 2dB of its final level
if the input is dropped by 6dB. Recovery compliments the attack
control by filtering the control voltage; longer recovery times
prevent pumping effects where gain reduction follows the
program material too closely. Settings of 100ms, 200ms,
400ms, 800ms, 1.5s and 3s are available.

Gain Reduction Meters
Gain reduction meters are provided post the A/B Bias control and pre the CV Link routing buttons to
show the level of attenuation being applied. The meters have 20dB f.s.d.

Issue 2

Page 11

8051 5.1 Compressor

User Guide

Key Input
A Key Input is provided to allow adjustable control from an external
source. Like the sidechains the key input has a threshold level
control ranging from -20 to +16 to set the intended level at which
compression control is required.
It can be used in several ways:

4

KEY I/P
SIDE
CHAIN
SEL
IN/OUT

A

q Injecting tone to provide a remotely variable base-level of

0

B

0
4

8

A
12

8

16

12

B
-20
100Hz

A/ B
BIAS

+1
+16
16

THRESHOLD dBu

8051

DISCRETE
MULTI-CHANNEL
COMPRESSOR

compression on one or both sidechains.
OUTPUT LEVEL dB

q 'Ducking' from an audio source such as dialogue.
q When connected in parallel with one of the inputs, it allows

POWER

-5
-5.5
5.5

0

that input to be routed onto both sidechains with different
compression thresholds.

Key Filter
The key input is provided with a selectable 12dB/octave high-pass LFE filter, fixed at 100Hz.

Bias Control
The bias control is used to balance the control voltages from the two sidechains by applying up to
6dB of cut and boost, effectively modifying their ratios.
If only a single sidechain is in use, for example when used as a stereo compressor, the bias control
allows ratio values between the standard settings to be selected with continuously variable control.

Output Level
This control provides a variable active pad across all six outputs, from 0dB to -5.5dB in 0.25dB
steps. The pad is outside of the relay bypass loop and so always controls all six channels together in
order to maximise the unit's output level without clipping.

Power
The power switch is illuminated dim red when the mains is present to indicate that the unit is in
standby mode. While in standby all switches are disabled, switch settings are retained and the unit
consumes minimal power.
Pressing the power switch brings the unit out of standby (power switch illuminates green). Pressing
and holding returns it to standby mode.

-

The unit can be brought out of standby remotely by connecting pins 1 and 12 on the rear panel
D-Type connector.

Issue 2

Page 12

8051 5.1 Compressor

User Guide

Mastering Compressor Controls (AM5292)
The 8051 Mastering Compressor is slightly different to the standard 8051 in 2 ways:
q It has 21 position detented pots for the Trim and Bias controls to aid total mechanical

recall of the unit.
q It has -1dB switches fitted to the Threshold and Gain Make-Up controls to allow for more

accurate settings, for example, in a mastering application the entire range of the switches
can be turned from 2dB steps into 1dB steps by the selection of the -1dB switches.
21 Position
Detented Pots

80
Hz

100

FILTER TO CHANNEL

120

0

10

1/2

10

5/6

0

1

10

SC TRIMS dB

4

10

100

Issue 2

B

2
2

A
B

3
3

A
B

4

A
B

5

A

6

B

6
6

3

2

1

EXT
A
CTRL

1

EXT
B
CTRL

1

A
B

2
2

A
B

3

5

4

3

A
B

4
4

A
B

0

8

5

A
B

6

MAKE-UP
GAIN dB

+1
16
+16

6:1
6::1

.8s

ATTACK

.1s

12

16

0

IN/OUT

0
4

8

A
12

8

16

12

B

20

dB

1..5s
1.5s

.2s
.2s
max

8

SIDE
CHAIN
SEL

-20
100Hz

3s

RATIO

A

RECOVERY

0
4

B

0

8

6ms

4ms
12
12

8ms

GAIN REDUCTION

16
0

8

4

-10
4

+20
2:1

12

8

16

12
-20

+1
16
+16

THRESHOLD dBu

MAKE-UP
GAIN dB

-1dB

3:1

.4s

4:1
6:
:1
6:1
max

RATIO

.8s

.1s

3s

RECOVERY

8

12

0

1.5s
1..5s

.2s
.2s

ATTACK

1.5:1

B

A/ B
BIAS

16ms

2ms

4

-1dB
8

B

.4s

4:1

1.5:1

-1dB

THRESHOLD dBu

A

3:1

KEY I/P

GAIN REDUCTION
16ms

+1
16
+16

THRESHOLD dBu

12
-20

6
6

+20
2:1
8

4

5

4

8ms

4

-10
4

16

A
B

6ms

4ms
2ms

8

12

5

8
12
12

4

5

4
4

0
4

16

CONTROL LINK

120

Neve

A

4

A
-1dB

SIDECHAIN FILTER

IN/OUT
80
Hz

6

SIDECHAIN LINK

1

0

10

4

3

2

M

10

1
3

5

BYPASS

0

MST

10

3

2

1

IN/OUT

10

-1dB Switches

16

8051M
DISCRETE

MULTI-CHANNEL
COMPRESSOR

OUTPUT LEVEL dB

20

dB

POWER

-5
-5.5
5.5

0

Page 13

8051 5.1 Compressor

User Guide

8051 Compressor - 88R(S) Console mounted AM5052

100

80
Hz

FILTER TO CHANNEL

120

1

IN/OUT
0

15

1/2

15

1
1

0

15

3

15

SC TRIMS dB

2

B

3

B

2

A

15

4

6

4

5

6

A

4

B

3

A

5

B

4

A

6

B

5

B

6

A

A

SIDECHAIN FILTER

1

IN/OUT
100

80
Hz

5

SIDECHAIN LINK

1
15

3

2

M

15

5/6

0

4

BYPASS

0

MST

15

3

2

3

2

5

4

6

CONTROL LINK

120

1

4

A

4

+16
+1
16

A

4

8
12
+16
+1
16

THRESHOLD dBu

4

8

0

12
12

12
12
4

16

16

8

8

-10

+20

-10

MAKE-UP
GAIN dB

4:1
6:1
6::1

2:1
1
1.5:1

6ms

4ms
4m
ms

6:1
6::1
Max

.4s
1.5s
1..5s

16ms
1
6ms

.8s
1.5s
1.
.5s

.2s

ATTACK

3s

8ms

2ms

.8s

.2ss

6ms

4m
4ms
ms

RATIO

16ms
16ms

2ms

MAKE-UP
GAIN dB

4:1

3:1
2:1

8ms

RATIO

.1s

+20

1.5:1

Max

.4s

A

B

4

4

3:1

B

6

A

0

-20

8

6

B

5

A

16
4

0

5

B

4

12

12
-20
0

THRESHOLD dBu

A

4

B

3

8

8

16

3

B

2

A

0

8
12

2

B

1

.1s

RECOVERY

ATTACK

3s

RECOVERY

GAIN REDUCTION

8

4

12

0

GAIN REDUCTION

8

4

16
20

12

16

0

20

dB

dB

A

B
SIDE KEY
CHAIN
I/P
SEL

IN/OUT
0

A/ B
BIAS

OUTPUT LEVEL dB

A

100Hz

4

B
0
4

8

8

16

12
-20

0

5.5
5.5

12

+1
+16
16

THRESHOLD dBu

2 TRACK MIXER

- 40

0

- 40

0

- 40

0

- 40

0

ON

ON

ON

ON

1-2
(L-R)

3
(C)

4
(S)

5-6
(LS-RS)

-

POST
INS

+10

2T TO
MON

2T
OUTPUT

-

As this unit is designed for fixed 5.1 compressor applications in an 88R(S) console the EXT A
CTRL and EXT B CTRL controls are not selectable (blank buttons).

Issue 2

Page 14

8051 5.1 Compressor

User Guide

I/O Wiring (AM5052 & AM5265)
56 Way Free Plug Varicon

Signal

Issue 2

Signal Name

Pin Number
Hi

Lo

Scn

1

1

Left Input

C

J

D

2

3

Centre Input

P

V

K

3

2

Right Input

U

Z

d

4

4

S Input

Y

c

f

5

5

LS Input

s

m

j

6

6

RS Input

x

t

n

7

1

Left Output

CC

y

JJ

8

3

Centre Output

MM

HH

NN

9

2

Right Output

B

F

A

10

4

S Output

L

R

E

11

5

LS Output

S

W

a

12

6

RS Output

X

b

e

13

Key Input

r

l

h

14

v

p

k

15

z

u

DD

16

LL

EE

KK

Page 15

8051 5.1 Compressor

User Guide

Specifications
I/O
The key input and LFE filter inputs are electronically balanced with an input impedance of 10kohms.
All other inputs are transformer balanced with 3.6kohms input impedances.
All outputs are electronically balanced post the output transformers, with maximum output of
+26dBu into 600ohms. The unit is calibrated for bridging loads greater than 10kohms.
Control Voltage I/O is provided for linking multiple units, or linking to 33609 compressors.
Connection is by 15 pin D-Type (see the section on EXT control for details).

Audio Performance
Equivalent input noise (20kHz band):

< -78dBu

THD+N (for 20dBu input @1kHz):

< 0.03%

Maximum Output Level:

> 26dBu into 600 ohms

Interchannel Crosstalk:

< -80dB at 15kHz

Control

Issue 2

LFE Filter:

12dB/octave low-pass, -3dB frequency selectable
to 80Hz, 100Hz or 120Hz.

Sidechain & Key Filters:

12dB/octave high-pass, -3dB frequency selectable to
80Hz, 100Hz or 120Hz.

Threshold:

-20dBu to +16dBu master control, with ±15dB
trims on all channels.

Make-up gain:

-10dB to +20dB.

Ratio:

1.5:1, 2:1, 3:1, 4:1, 6:1, MAX (~8:1).

Attack:

2ms, 4ms, 6ms, 8ms and 16ms.

Release:

100ms, 200ms, 400ms, 800ms, 1.5s and 3s.

Output Level Trim:

0dB to -5.5dB pad, in 0.25dB steps.

Page 16

8051 5.1 Compressor

Issue 2

User Guide

Page 17



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