Master audio DSP306USB, DSP408USB User Manual

DSP Series

DSP306USB
DSP408USB

Firmware v9.xx

Software DSPLink v9.xx

Pol. Ind. Norte - Perpinyà, 25

08226 TERRASSA (Barcelona-SPAIN)

Copyright © 2010 [e-mail]

All rights reserved www.master-audio.com

Nov 10

User Manual

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DSPSeries - MUS - Ver 1.1 ENG Nov 10 2

ENGLISH

Safety Instructions

1. READ THESE INSTRUCTIONS

All the safety and operating instructions should be read before the product is
operated.

2. KEEP THESE INSTRUCTIONS
The safety and operating instructions should be retained for future reference.

3. HEED ALL WARNINGS
All warnings on the product and in the operating instructions should be adhered to.

4. FOLLOW ALL INSTRUCTIONS
All operating and use of instructions should be followed.

5. DO NOT USE THIS APPARATUS NEAR WATER
Do not use the product near water. For example, near a bathtub, washbowl, kitchen
sink, or laundry tub, in a wet basement, or near a swimming pool, and the like.

6. CLEAN ONLY WITH DRY CLOTH
Unplug the unit from the wall outlet before cleaning. Do not use liquid cleaners or
aerosol cleaners. Use a damp cloth for cleaning.

7. DO NOT BLOCK ANY VENTILATION OPENINGS
Slots and openings in the cabinet back or bottom are provided for ventilation, to
ensure reliable operation of the limit and to protect it from overheating. These
openings must not be blocked or covered. The openings should never be blocked by
placing the product on a bed, sofa, rug, or similar surface. This product should never
be placed near or over a radiator or heat source. This product should not be placed in
a built-in installation such as a bookcase or rack unless proper ventilation is provided
or the manufacture's instructions have been adhered to.

8. DO NOT INSTALL NEAR ANY HEAT SOURCES
This Product should be situated away from heat sources such as radiators, stoves, or
other products (including amplifiers) that produces heat.

9. DO NOT DEFEAT THE SAFETY PURPOSE OF THE POLARIZED OR
GROUNDING-TYPE PLUG
A Polarized plug has two blades with one wider than the other. A grounding-type plug
has two blades and a third grounding prong. The wide blade or the third prongs are
provided for your safety. If the provided plug does not fit into your outlet, consult an
electrician for replacement of the obsolete outlet.

CAUTION

RISK OF ELECTRIC SHOCK

DON’T OPEN

To reduce the risk of fire or electric shock do
not expose this equipment to rain or moisture

WARNING:

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10. PROTECT THE POWER CORD FROM BEING WALKED ON OR PINCHED
PARTICULARLY AT PLUGS, CONVENIENCE RECEPTACLES, AND THE POINT
WHERE THEY EXIT FROM THE APPARATUS.

11. ONLY USE ATTACHMENTS/ ACCESSORIES SPECIFIED BY THE
MANUFACTURER.

12. UNPLUG THIS APPARATUS DURING LIGHTNING STORMS OR WHEN
UNUSED FOR LONG PERIODS OF TIME.
For added protection for this unit during a lightning storm, or when it is left unattended
and unused for long periods of time, unplug it from the wall outlet and disconnect the
antenna or cable system. This will prevent damage to the unit due to lightning and
power line surges.

13. REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL. SERVICING
IS REQUIRED WHEN THE APPARATUS HAS BEEN DAMAGED IN ANYWAY,
SUCH AS WHEN THE POWER SUPPLY CORD OR PLUG IS DAMAGED, LIQUID
HAS BEEN SPILLED OR OBJECTS HAVE FALLEN INTO THE APPARATUS, THE
APPARATUS HAS BEEN EXPOSED TO RAIN OR MOISTURE, DOES NOT
OPERATE NORMALLY, OR HAS BEEN FROPPED.

14. WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.

15. APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING AND
NO OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, SHALL BE PLACED ON
THE APPARATUS.

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1.INTRODUCTION

The DSP306/408 USB is a complete digital loudspeaker management system
designed for the touring or fixed sound installation markets. The absolute latest in
available technology is utilized with 40-bit floating point processors and high
performance 24-bit Analogue Converters. The high-bit DSP prevents noise and
distortion induced by truncation errors of the commonly used 24-bit fixed-point
devices. A complete set of parameters include I/O levels, delay, polarity, 8 bands of
parametric EQ per channel, 31 bands of graphic EQ per input, multiple crossover
selections and full function limiters. Precise frequency control is achieved with its 1
Hz resolution. Inputs and outputs can be routed in multiple configurations to meet any
requirements.

The DSP

306/408 USB can be controlled or configured in real time on the front panel
or with the intuitive PC GUI accessed via the USB interface (or optionally Ethernet).
Software upgrade for CPU and DSP via PC keeps the device current with newly
developed algorithms and functions once available.

Multiple setup storage and system security complete this professional package.

Shipped contents:

- DSP306/408 USB unit

- AC power cord

- USB cable for PC connection

- Pen Drive (USB) with software and User Manual

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2.FEATURES

- 3 Inputs and 6 Outputs with flexible routing (DSP306USB)

- 4 Inputs and 8 Outputs with flexible routing (DSP408USB)

- 40-bit floating point DSP

- High Performance 24-bit A/D Converters

- 1 Hz Frequency Resolution

- 8 Parametric Equalizers for each Input and Output

- 31-band Graphic Equalizer for each Input

- Multiple Crossover types with Full Function Limiters

- Precise Level, Polarity and Delay

- CPU and DSP upgrade via PC

- 2-Line x 16 Character Blue Backlit LCD Display

- Full 5-segment LED’s on every Input and Output

- Storage of up to 30 Program Setups

- Security Lock

- USB Interface for PC Control and Configuration

- Ethernet interface option available

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3.THE FRONT PANEL

A) USB Connector – A standard type B USB connector for interface with a PC.

Software and driver must be installed prior to usage.

B) Mute keys - Mute/Unmute input and output channels. When an input channel is

muted, they key will light up in red for indication.

The Mute keys are also used to access the program of each channel in combination
with the Menu> and <Menu keys. Holding one of the Menu keys and pressing the
Mute key of the desired channel will give access to the channel parameters, and will
be acknowledged by a green led below the mute key. Multiple channels can be linked
or unlinked to ease the programming. Inputs and outputs are linked separately.

C) Channel Menu LED – Indicates the activated channels for parameter modification

D) Peak Level LED - Indicates the current peak level of the Signal: Signal, -12dB, -

6dB, -3dB, Overload/Limit. The Input Overload LED references to the device's
maximum headroom. The Output Limit LED references to the threshold of the
limiter.

E) LCD - Shows all the necessary information to control the unit.

F) Menu Control keys - There are 6 menu keys: <Menu (Menu Down), Menu>

(Menu Up), <Select (Cursor Down), Select> (Cursor Up), Enter and Exit. The
functions of each key is explained below:

<Menu: Previous menu screen. In combination with the channel Mute key, the
specific channel Menu is displayed.

Menu>: Next menu screen. In combination with the channel Mute key, the specific
channel Menu is displayed.

<Select: Previous cursor in the menu screen

Select>: Next cursor in the menu screen

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Enter: This key has three different functions depending on when it is used:

- In the System Menu is used to proceed with selected actions.

- In the Main Menu allows entering the System Menu.

- In delay and frequency adjustments (1 Hz resolution mode) modifies data values by
100X (used with thumb wheel).

Exit: Exit to the Main Menu

G)

Rotary Thumb Wheel - Changes parameter data values. The wheel has travel
velocity sensing which ease large incremental data modifications. For modifying
delay and frequency (1 Hz resolution), pressing the Enter key simultaneously will
increment/decrement the data value by 100X.

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4.THE REAR PANEL

A) Power switch - Controls power On/Off.

B) Main Fuse - T200mA-250V. Slow blow type.

C) Main Power - Connects via a standard IEC socket. A compatible power cord is

supplied with the unit. The voltage input is 90-240VAC, 50-60Hz

D) Ethernet slot – Slot to install the optional Ethernet module. With this accessory,

the unit can be connected to a router, switch or PC through CAT-5 cable.

E) XLR input and outputs - Separate 3-pin XLR connectors are provided for each

audio input and output. The device's output stage employs the balanced
impedance topology. All I/O connectors have pin 1 as ground (shield), pin 2 as +
and pin 3 as -.

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5.POWER UP

After powering up the unit, the following initialization screen is displayed on the LCD:

The initialization process takes about 8 seconds and during that period the unit boots
and displays the DSP306 or DSP408 firmware version.

After that, the DSP unit displays its main screen:

The screen shows the current program number and program name assigned to the
unit. The program assigned is always the last program the user recalled or stored
before powering down the unit. An asterisk (*) beside the program number means
that the program has been modified but not stored.

Now the DSP unit is ready to operate.

DSP306 v

9.02

MAS

TER DSP306

P01 ____________

MASTER DSP408

DSP408 v

9.02

MASTER DSP408

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6.OPERATING THE DEVICE

6.1.Input Menus

To access the Input Menus, hold the <Menu or Menu> key and press the Mute key of
the desired channel. The green led below the Mute key will light up. More than one
input channel may be selected by holding the Menu key and pressing the
corresponding Mute key. Press Exit to deselect all.

The following menus are available for each input channel:

6.1.1. Signal - Signal parameters

• LEVEL - Gain, -40.00dB to +15.00dB in 0.25dB steps.

• POL - Polarity, can be normal (+) or inverted (-).

• DELAY - Delay in 11us steps. It can be displayed in ms, ft or m. The time unit of the
delay can be changed in the System menu. The maximum delay permitted is 650ms.

6.1.2.EQ - EQ parameters

• EQ# - Selects one of the 8 available Equalizers.

• BYPASS – When set On, the currently selected EQ will be bypassed.

LEVEL:0.00dB

I1:______ Signal

POL:+

I1:______ Signal

DELAY:000.000ms

I1:______ Signal

EQ#:1

I1:______ EQ1

BYPASS:Off

I1:______ EQ1

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• TYPE - Type of EQ. The types can be parametric (PEQ), Lo-shelf (LO-SHF), Hi­shelf (HI-SHF), 1

st

degree all-pass (AP-1) and 2nd degree all-pass (AP-2).

•

FREQ - EQ center frequency. Ranges from 20 to 20,000Hz in either 1Hz steps or

1/36 octave steps. The frequency steps can be selected in the System Menu.

• BW - EQ Bandwidth. Ranges from 0.02 to 3.61 octaves, in steps of 0.01 octave
steps for PEQ, LO/HI-SHF and AP-2. For AP-1, the bandwidth sets the phase shift at
the centre frequency. This phase is gradually changed from 180 degrees above the
centre frequency to the specified value.

• LEVEL - EQ level gain. Ranges from -30.00dB to +15.00dB in 0.25dB steps.

6.1.3. Input Graphic Equalizer

• GEQ# - Selects one of the 31 available bands, from 20Hz to 20kHz. The selected
frequency is shown.

• LEVEL - GEQ level gain. Ranges from -30.00dB to +15.00dB in 0.25dB steps.

FREQ:1000Hz

I1:______ EQ1

BW:0.33 Q=4.36

I1:______ EQ1

TYPE:PEQ

I1:______ EQ1

LEVEL:0.00dB

I1:__

____ EQ1

DEG:15.

5 deg

I1:______ EQ1

GEQ#:1 f=20

I1:______ GEQ1

LEVEL:0.00dB

I1:______ GEQ1

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• BYPASS – When set On, the currently selected GEQ will be bypassed.

6.1.4.Crossover

•

TYPL - Filter Type of low frequency crossover point (high pass). Types can be

Butterworth, Linkwitz-Riley or Bessel.

•

FRQL - Filter cut-off Frequency of low frequency crossover point (high pass).
Ranges from 20Hz to 30kHz in either 1Hz steps or 1/36 octave steps. The frequency
steps can be selected in the System Menu.

• SLPL - Filter Slope of low frequency crossover point (high pass). Ranges from 6 to
48dB/octave. If the selected Filter Type is Linkwitz-Riley, the available slopes are 12 /
24 / 36 / 48 dB/octave.

• TYPH - Filter Type of high frequency crossover point (low pass). Same types as for
high pass filters are available: Butterworth, Linkwitz-Riley and Bessel.

• FRQH - Filter cut-off frequency of high frequency crossover point (low pass).

BYPASS:Off

I1:______ GEQ1

TYPL:Off

I1:______ XOver

FRQ

L:1000Hz

I1:______ XOver

SLPL:24dB

I1:______ XOver

TYPH:Off

I1:______ XOver

FRQH:1000Hz

I1:______ XOver

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• SLPH - Filter Slope of high frequency crossover point (low pass).

The following table summarizes all possible crossover configurations:

6.1.5.Comp – Dynamics Compressor

•

THRESH - Compressor Threshold. Ranges from -20 to +20dBu in 0.5dB steps.

• ATTACK - Attack time. Ranges from 0.3 to 1ms in 0.1ms steps, then ranges from 1
to 100ms in 1ms steps.

• RELEASE - Release time. Can be set at 2X, 4X, 8X, 16X or 32X the attack time.

Filter config. Low Xover point High Xover point

None TYPL Off TYPH Off

Highpass TYPL not Off TYPH Off

Lowpass TYPL Off TYPH not Off

Bandpass TYPL not Off TYPH not Off

SLPH:24dB

I1:______ XOver

FQRL

FQRH

FQRH

FQRL

THRESH:0.0dBu

I1:______ Comp

ATTACK:10ms

I1:______ Comp

RELEASE:8xAtck

I1:______ Comp

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• RATIO – The compressor ratio determines the slope in which the signal is
compressed. Ranges from 1:1 (no compression) to 1:40 are available.

6.1.6.Name - Channel Name

•

NAME - Channel name. It is 6 characters in length.

6.2.Output Menus

To access the Output Menus, hold the <Menu or Menu> key and press the Mute key
of the desired channel. The green led below the Mute key will light up. More than one
output channel may be selected by holding the Menu key and pressing the
corresponding Mute key. Press Exit to deselect all.

The following menus are available for each ouput channel:

6.2.1.Signal - Signal parameters

• Refer to the Input Menus for details

6.2.2.EQ - EQ parameters

• Refer to the Input Menus for details

6.2.3.XOver - Crossover parameters

• Refer to the Input Menus for details

6.2.4.Limit - Output Limiter

• THRESH - Limiter Threshold. Ranges from -20 to +20dBu in 0.5dB steps.

• ATTACK - Attack time. Ranges from 0.3 to 1ms in 0.1ms steps, then ranges from 1
to 100ms in 1ms steps.

NAME:______

I1:______ Name

THRESH:0.0dBu

O1:______ Limit

RATIO: 1:1

I1:______ Comp

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• RELEASE - Release time. Can be set at 2X, 4X, 8X, 16X or 32X the attack time.

6.2.5.Source - Input Source

• 1, 2, 3, 4 – Input channel source for the current output channel. It can be set to mix
the input source (in dB) or disable it (Off). If more than one input source is enabled,
they will be added together as the source for the current output channel.

(Input #4 only available for DSP408)

6.2.6.Ch-Name - Channel Name

• Refer to the Input Menus for details

6.3.System Menu

The System Menu allows the user to control and change parameters that are related
to the system behaviour and general operation. It can be accessed by pressing the
Enter key in the main menu (when no Input/Output or System Menu is activated). All
System Menus require the Enter key to be pressed for the selected action.

ATTACK:10ms

O1:______ Limit

RELEASE:8xAtck

O1:______ Limit

1:0.00

O1:______ Source

2:-14.00

O1:______ Source

3:Off

O1:______ Source

4:Off

O1:______ Source

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6.3.1.Recall - Program Recall

The DSP unit has a built-in non-volatile memory that can store up to 30 different
program setups. A program can be recalled using this menu.

• P:# - Program Number to be recalled. Press Enter twice to confirm the operation.

6.3.2.Store - Program store

A program can be stored using this menu. The old program with the same program
number will be replaced. Once the program is stored in the flash memory, it can be
recalled at a later time, even after power down.

• P:# - Program Number for the current data to be stored.

• NAM - Program Name, allows a maximum length of 12 characters.

6.3.3.Config - Device Configuration

• MODE - configures the mode of operation. The possible modes are shown in the
following table:

Mode Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7

(408 only)

Out 8

(408 only)

None Any Any Any Any Any Any Any Any
Stereo 2-Way In1 In1 In2 In2 Any Any Any Any
Stereo 3-Way In1 In1 In1 In2 In2 In2 Any Any
Stereo 4-Way

(408 only)

In1 In1 In1 In1 In2 In2 In2 In2

The unit assigns the Input source for the corresponding outputs when the Mode of
Configuration is selected. The crossover point parameters like the filter type, cut-off

P:1 __

__________

SYSTEM Recall

NAM:____________

SYSTEM Store

P:1

SYSTEM Store

MODE:None

SYSTEM Config

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frequency and slope have to be configured manually in the Xover Menu in each
Output menu.

Note: The configuration mode configures the input sources when selected. The user
can change the source afterwards if desired. It does not keep the configuration in
memory.

6.3.4.Copy - Copy channels

Copy Channels from the source to the target. When the Source and Targets are both
Inputs and Outputs, all audio parameters will be copied. When one of the Source or
the Target is an input while the other is an output, only the Level, Polarity, Delay and
EQ are copied.

• SOURCE - Channel to be copied from.

• TARGET - Channel to be copied to.

6.3.5.General - General system parameters

• FREQ MODE - Selects the frequency control mode for EQ and crossover filters.
Can be 36 steps/octave or All Frequencies (1 Hz resolution).

• DELAY UNIT - ms, ft or m.

6.3.6.Comm – Communication Settings

• BAUD RATE – Sets the baud rate of serial communication. Default is 115200bps.

SOURCE:In1

SYSTEM Copy

TARGET:In2

SYSTEM Copy

FREQ MODE:36/Oct

SYSTEM

Generl

DELAY UNIT:ms

SYSTEM Generl

BAUD RATE:115200

SYSTEM Comm

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• DEVICE ID - Assigns the device an ID from 1 to 16. This ID is useful when a
network of more than 1 unit is present.

•

NETWORK ID - Assigns the device an ID from 0 to 60000. This ID is used for future

expansion only, please leave these value at 0.

6.3.7.Passw – Security Password

The factory default password is blank “____”, and it may be changed to any 4­character combination in this menu.

•

OLD PW – The user is required to enter the old password first in order to modify it.

• NEW PW – The new password desired.

6.3.8.Secure – Front Panel Security Lock

The DSPSeries unit enables the user to secure the unit and prevent undesired
changes in the setup by locking all the keys on the front panel. The unit password Is
required to proceed with this action.

• PASSWORD – The user is required to enter the password to lock the unit.

All controls in front panel will be locked. To unlock the unit, press the Enter key and
browse again to the System/Secure Menu. Enter the password again and confirm.

DEVICE ID:1

SYSTEM Comm

NETWORK ID:0

SYSTEM Comm

NEW PW:____

SYSTEM Passwd

OLD PW:____

SYSTEM Passwd

PASSWORD:____

SYSTEM Secure

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6.3.9.Eth-IP – Ethernet IP address

It determines the unique IP address on the unit in the network.
This parameter is only available when the Ethernet card accessory is installed.

6.3.10.Eth-GW – Ethernet gateway

The gateway address of the network, usually the IP address of your router, switch or
hub.
This parameter is only available when the Ethernet card accessory is installed

6.3.11.Eth-SM – Subnet mask

The subnet mask used by your network.
This parameter is only available when the Ethernet card accessory is installed

:192.168.001.020

SYSTEM Eth

-

IP

:192.168.001.001

SYSTEM Eth

-

GW

:

255.255.255.000

SYSTEM Eth

-

SM

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7.QUICK REFERENCE

Parameters

Menu

<Menu>

Field

<Select>

Min Max Steps Units

Level Signal LEVEL -40 +15 0.25 dB
Polarity Signal POL + / -

Delay Signal DELAY 0 62,400 1

11us

steps
EQ Number EQ EQ# 1 8 1
EQ Bypass EQ BYPASS Off/On
EQ Type EQ TYPE PEQ / Lo-Shf / Hi-Shf / AP-1 / AP-2
EQ Level EQ LEVEL -30 +15 0.25 dB
EQ Frequency EQ FREQ 20 30k 1 Hz
EQ Bandwidth EQ BW 0.02 3.61 0.01 Octave
GEQ Number GEQ GEQ# 1 31 1
GEQ Level GEQ LEVEL -30 +15 0.25 dB
GEQ Bypass GEQ BYPASS Off/On

Xover Low Type XOver TYPL

Off / Butterworth / Linkwitz-Riley /

Bessel
Xover Low Freq. XOver FRQL 20 30k 1 Hz
Xover Low Slope XOver SLPL 6 48 6 dB/octave

Xover High Type XOver TYPH

Off / Butterworth / Linkwitz-Riley /

Bessel
Xover High Freq. XOver FRQH 20 30k 1 Hz
Xover High
Slope

XOver SLPH 6 48 6 dB/octave

Compressor
Threshold

Comp THRESH -20 +20 0.5 dBu

Compressor
Attack Time

Comp ATTACK 0.3 100 0.1/1 ms

Compressor
Release Time

Comp RELEASE 2 / 4 / 8 / 16 / 32X Attack time

Compressor
Ratio

Comp RATIO 1:1 to 1:40

Limiter
Threshold

Limit THRESH -20 +20 0.5 dBu

Limiter Attack
Time

Limit ATTACK 0.3 100 0.1/1 ms

Limiter Release
Time

Limit RELEASE 2 / 4 / 8 / 16 / 32X Attack time

Source Source 1 to 4 Off +15 0,25 dB
Channel Name Name NAME 6 characters

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8.PC CONTROL SOFTWARE

The DSP units are shipped with a special PC Graphic User Interface (GUI)
application - DSPLink. DSPLink gives the user an option to control the DSP unit from
a remote PC via the USB communication link (or optionally through Ethernet with the
optional Ethernet card). For the USB connection a driver must be installed (included
with the DSPLink installation package). For the Ethernet connection, the IP address
should be set as indicated in section 6.3.9 of this manual.

The GUI application makes it much easier to control and monitor the device, allowing
the user to get the whole picture on one screen. Programs can be recalled and stored
from/to PC’s hard drive, thus expanding the storage to become virtually limitless.

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9.TROUBLESHOOTING

9.1.Password forgotten

In case you set up a lock password in the DSP unit and you don’t remember it any
more, please take the following steps:

A) Power on the device

B) During a few seconds, an 8-character code is shown in the LCD display. Write it

down.

C) Send the code to [e-mail]

D) You will receive an answer with the unlock code as soon as your mail is

processed.

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10.SPECIFICATIONS

Inputs and Outputs

Input Impedance……... >10 kOhms
Output Impedance…… 50 Ohms
Maximum Level……... +20 dBu
Type…………………. Electronically balanced

Audio Performance

Frequency Response…. +/- 0.1dB (20Hz to 20kHz)
Dynamic Range……… 115 dB typ. (unweighted)
CMMR……………….. > 60 dB (50Hz to 10kHz)
Crosstalk……………... < -100 dB
Distortion…………….. 0.002% (1kHz@+4dBu)

Digital Audio Performance

Processor……………... 40-bit
Sampling Rate……….. 96 kHz
Analog Converters…… High Performance 24-bit
Propagation Delay…… 1.5 ms

Front Panel Controls

Display………………. 2 x 16 Character Backlit LCD
Level Meters…………. 5 segment LED
Buttons……………….. Mute Controls, Menu Controls
Dial Encoder…………. Embedded Thumb Wheel

Connectors

Audio………………… 3-pin XLR

Pin 1: shield
Pin 2: live (+)

Pin 3: return (-)
USB……………….. … Type B
Ethernet……………… RJ-45 (optional)
Power………………… Standard IEC Socket

General

Power………………… 90-240 VAC (50 / 60Hz)
Dimensions…………... 483x44x203 mm
Weight……………….. 4.6kg

Audio Control Parameters

Gain………………….. -40 to +15dB in 0.25dB steps
Polarity………………. +/­Delay………………… Up to 650ms per I/O

- Equalizers (8 per I/O) ­Type………………….. Parametric, Hi-shelf, Lo-shelf, All pass 1st order, All-pass

2nd order
Gain………………….. -30 to +15dB in 0.25dB steps
Bandwidth……………. 0.02 to 3.61 octaves (Q=0.3 to 72)

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- 31-band Graphic Equalizers (1 per Input) ­Gain………………….. -30 to +15dB in 0.25dB steps

- Crossover Filters (2 per Input/Output) ­Filter Types………….. Butterworth, Bessel, Linkwitz-Riley
Slopes………………... 6 to 48dB/oct

- Compressors (1 per Input) ­Threshold…………….. -20 to +20dBu
Attack……………...… 0.3 to 100ms
Release………………. 2 to 32X the attack time
Ratio…………………. 1:1 to 1:40

- Limiters (1 per Output) ­Threshold…………….. -20 to +20dBu
Attack……………...… 0.3 to 100ms
Release………………. 2 to 32X the attack time

System Parameters

No. of Programs……… 30
Program Names……… 12 character length
Delay Units………...… ms, ft, m
Frequency Modes……. 36 steps/oct, 1Hz resolution
Security Lock………… Lock/Unlock
Copy channels……….. All parameters
Channel Names………. 6 character length

Note: Specifications subject to change without notice