PARK AUDIO DF DSP Series User manual

PROFESSIONAL
FOUR CHANNEL
SWITCHING POWER AMPLIFIER
DF-series with DSP
DF2008DSP
DF1408 DSP
DF2804DSP
DF1404 DSP
Owner’s Manual
R

ACCESSORIES
1. Power Cord 1pc.
2. Owner’s Manual 1pc.
3. Warranty 1pc.

CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
CAUTION! The amplifier runs on 230V AC voltage. Removing the cover will expose
you to a potentially dangerous voltage! Do not use the unit if the electrical power cord is
frayed or broken.
Power is supplied from 230V AC single-phase grounded 50/60 Hz source!
CAUTION! The amplifier can yield dangerous output voltage! Do not touch the non-
insulated cable parts, connected to the unit in operation!
CAUTION! The high sound pressure level of speaker systems generated by high
output power, delivered by the amplifier, may be hazardous to your hearing. Please,
take adequate safety precautions.
WARNING! The amplifier yields high output power. The manufacturer shall not be held
responsible for any damage to the speakers caused by excessive power from the unit.
WARNING SIGNS:
Important information!
Intended to warn the user about any important applicable information
contained in this Owner’s Manual.
Hazardous voltage inside!
Intended to warn the user about electric shock hazard due to high voltage
inside the product.

GENERAL
DF-series with DSP (DF1404DSP, DF1408DSP, DF2008DSP, DF2804DSP) are
modern amplifiers for professional entertainers, who require maximum performance and
sound quality on a limited budget. Amplifiers are designed for application in
PA systems with high requirements for precise tuning of the parameters, but without the
need for operative change.
Built-in DSP accurately handles the audio signal due to its functions of equalization,
filtering, delay and limiter. Processor has 2 inputs and 4 outputs and provides free signal
routing from any input to any output.
DSP enables users to choose between eight factory preset settings. Setting
presets (operation modes) is performed by DIP switch. Any of presets can be modified
using a computer connected via USB interface (software – SigmaStudio by Analog
Devices, Inc.).
ATTENTION! The DF1404DSP, DF1408DSP,DF2008DSP and DF2804DSP
amplifiers have the same design and functional features and differ only in the schematics
elements, output power and weight. Unless specified otherwise, the word «amplifier»
hereinafter applies to any of the above models..
To ensure the most advantageous and faultless operation of the amplifier, please,
read this Manual before use.
UNPACKING
The manufacturer’s quality control system provides for careful examination of each
product before it leaves the factory to ensure its flawless appearance. After unpacking,
please, check the unit for any physical damage. In case of damage, please, contact your
local dealer. Keep the shipping carton and all packing material, as you may require them
for reshipment of the unit.
2

3
DESIGN FEATURES
Physical Design
The amplifier is enclosed in a metal (steel) case of 88 mm (2U) height. The amplifier
is designed to be standard rack-mounted (RACK 19").
Power Supply Unit
All four channel of the amplifier share the same pulse power supply unit.
Power Factor Correction (in DF2008DSP only)
The amplifier has power supply with Power Factor Correction, which significantly
reduces load to the mains and also reduces noise and distortion in the mains. What is
more important, the amplifier output power is no longer rigorously dependent on the mains
voltage.
The amplifier provides full power at the mains voltage from 160 V to 250 V (with no
need to use of external AC voltage stabilizer).
Cooling System
The amplifier features a forced cooling system which is common for all four channels.
The amplifier and the power supply unit are cooled with a single fan blowing front to rear.
The cooling system provides for a double-step intensity-cooling rate switching. At a normal
temperature, the fan runs at a low speed, thus generating the least noise possible. When
the amplifier is set to deliver a high output power or when the ambient temperature is
higher than normal, the cooling system may switch the fan to the other (higher) cooling
rate.
Output Stage
The output stage of this digital power amplifier is designed according to Class D
technology to deliver high efficiency and least heat. The high switching rate ensures the
high sound quality comparable with the best analogue amplifiers.
Balanced Inputs
The use of balanced inputs provides for an essential reduction of the environment-
induced hum and noise interference with long input connecting cables.
Line Outputs
The amplifier line outputs are parallel to the inputs (each along the respective
channel) and provide for parallel connection of several amplifiers with standard signal
cables using XLR connectors.
If necessary, the signal, processed by the DSP, can be applied to the line outputs.
This mode is set at the factory or by the customer (manufacturer get corresponding
instructions by e-mail: [email protected]).
DSP
Built-in DSP accurately handles the audio signal due to its functions of equalization,
filtering, delay and limiter. Processor has 2 inputs and 4 outputs and provides free signal
routing from any input to any output.
DSP enables users to choose between eight factory preset settings. Preset
parameters are listed on the insert in the Owner’s Manual.
Any of presets can be modified, using a computer connected via USB interface
(software – SigmaStudio by Analog Devices, Inc.).

The installation package of the SigmaStudio ver.3.10 (32-bit and 64-bit program
versions available) software and user manual can be downloaded from the site
parkaudio.ua (Download section on the pages of the corresponding amplifiers).
Moreover, in the Download section you can find:
SigmaStudio User Manual – user guide on setting built-in amplifers with DSP by
SigmaStudio.
SigmaStudio Video Tutorial – video tutorial about setting amplifers with DSP by
SigmaStudio.
Limiter’s User Manual – recommendations on limiters setting in signal processing
tracts;
Project Templates – SigmaStudio project template for amplifiers with DSP ;
DF-series Factory DSP Presets – DSP preset settings description.
Limiter’s Setting Calculations – simple calculator (Excel) to calculate the
parameters of the limiter.
DSP PRESET Switch
The amplifier modes (DSP presets) can be switched by the DIP switch, located on
the rear panel.
Input Level Attenuators
These allow setting the amplifier to the required sensitivity (each channel
individually) which is very helpful when several amplifiers are used to drive different types
of loudspeakers or are used within multi-speaker sound reinforcement systems. The
attenuators are located on the front panel.
Detachable Power Cord
This feature is provided for convenience of transportation and rack mounting.
4

FUNCTIONAL FEATURES
Overload and Short-Circuit Protection
Individual per each channel. This protective system becomes active in case of short-
circuited output or overload caused by reduced load impedance. It disables the output
signal of the respective channel for 0.5 second and then the amplifier gradually resumes
its delivery.
DC Output Protection
The amplifier’s schematics precludes transit of any clicks or noise during the power-
on/off transition process. The power source unit is responsible for preventing any DC
damage to loudspeakers. In the event of output DC voltage or any powerful LF
fluctuations, the power source unit goes off and all indicators, including the POWER LED,
go off too.
The amplifier can be restarted in 2 or 3 minutes by power off and power on the
amplifier with the POWER switch. If the DC is an occasional problem (which is unlikely) the
amplifier goes on and resumes its normal operation. If the DC output voltage is still
present, the protection system will again turn off the power supply.
Thermal Protection
Independent for each channel. In this case upon reaching 85°C, the independent
protection system disables the respective channel of the amplifier. The CLIP LED goes on
and the SIGNAL LED of the affected channel goes off.
As soon as the amplifier cools down, the affected channels gradually regain their
amplification level up to the set value.
Soft Signal Start
During the power-on process, this feature ensures smooth rise amplification level
from zero to the set value.
5

BLOCK DIAGRAM
1+ 1+
2+ 2+
1+
CH 1-2
INPUT
CH 3-4
INPUT
Power
amplifier
Ch 1
1+
2+ 2+
THROUGH
THROUGH
LEVEL
CH1, CH2,
BRIDGE (CH 1-2)
SPEAKER
OUTPUTS
CH2
DSP
Out 0
In 0
Out 2
Out 1
In 1
Out 3
DSP
PRESET
1
2
3
ON
DIP
Switch
CH3, CH4,
BRIDGE (CH 3-4)
CH 4
Ch1 Ch2 Ch3Ch 4
CLIP
Ch 4 CLIP
Ch3 CLIP
Ch2 CLIP
Ch1 CLIP
Ch 2 Ch 3 Ch 4
USB Port USB
Interface
6

1112131415
135
42 6 8 10
79
FRONT PANEL
THERMAL – overheating alarm LED.
Brightness depends on the temperature of the heat sink (See: Thermal
Protection).
POWER LED.
LED goes off when the DC output protection system activated.
CLIP – clip LEDs for Channels 1, 2, 3 and 4, respectively.
They indicate:
– overload condition causing distortion;
– activation of DSP limiter;
– activation of thermal protection system which disables the respective
channel (the SIGNAL LED goes off). (See: Thermal Protection).
SIGNAL LEDs, indicating output signal on Channels 1, 2, 3 and 4, respectively.
LEVEL – input (sensitivity) level attenuators for Channels 4, 3, 2 and 1,
respectively.
POWER switch.
3
4
11
5
6
12
7
8
13
1
2
9
10
14
15
7

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS EQUIPMENTTO RAIN OR MOISTURE.
DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING
THROUGH CH3-4 CH1-2 THROUGH
USB
DSP
PRESET
CH 2
CH 1CH 2
SPEAKER OUTPUTS
4 min
4 min
1
1
2
2
1
1
4 min
8 min
1
2
CH 4
CH 3CH 4
4 min
4 min
1
1
2
2
1
1
4 min
(CH3-4)
8 min
1
2
BRIDGE
(CH1-2)
BRIDGE
MAINS IN
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
1 2
3
ON
PUSH PUSH
12
4
3
567891011
REAR PANEL
DSP PRESET – the amplifier modes DIP-switch.
SPEAKER OUTPUTS – output SpeakOns, used to connect to loudspeakers.
The signals, applied to the output connectors, and their polarity are shown on
the rear panel of the amplifier.
MAINS IN – power cord socket for 230V AC 50/60Hz grounded mains.
THROUGH – line outputs (XLR male). Are used to send input signal along the
respective input of another amplifier. THROUGH connectors are parallel to
respective INPUT (CH1-2, CH3-4) connectors.
INPUT – balanced inputs (XLR female).
USB – port for connection to personal computer.
235
7
4
1
6
10
11
89
Park Audio M ade i n Ukraine
No Serial
8

CABLE REQUIREMENTS
Input Cables
Make sure to use only shielded cables whether balanced or unbalanced. Shielding,
when properly grounded, protects a signal against external electrical interference.
As a rule, unbalanced lines over 3 meters long are not acceptable. Greater distances
require a balanced cable. Avoid placing input cables close to power cords or power
transformers.
Output Cables
The amplifier is capable of delivering high level output current; therefore, the wire
gauge used for speaker cables is particularly important. Inadequate wire gauge adds
significant resistance to the speaker’s own impedance, reducing the power, which is
actually delivered to the speaker. It will also result in a decreased damping factor and
possible fire hazard.
Since the power, applied to the loudspeaker, is of primary concern in system design,
we have included the table below to allow you determine the appropriate wire gauge for
your application.
Power Loss in a 10-meter Cable
The table shows the percentage of the power loss in a 10-meter copper multiple-core
cable. This table reflects the power loss as a percentage of the output power of the
amplifier applied to the load. Use this table to determine the power loss to the load at other
cable lengths. For example, if you plan to deliver 100 Watts to 8-Ohms load through 20-m
2
cable of 0.75-mm gauge, the power loss in the cable would be 5.8% x 2=11.6% of 100W
or 11.6W lost in the cable.
2
0.50mm
2
0.75mm
2
1.00mm
2
1.50mm
2
2.00mm
2
2.50mm
2
4.00mm
0.72 Ohms
0.49 Ohms
0.36 Ohms
0.24 Ohms
0.18 Ohms
0,15 Ohms
0.09 Ohms
15.4 %
10.9 %
8.3 %
5.7 %
4.3 %
3.6 %
2.3 %
8.3 %
5.8 %
4.3 %
2.9 %
2.2 %
1.8 %
1.1 %
Wire Gauge Cable
Resistance Cable Power Loss
4 Ohms Load 8 Ohms Load
9

INPUT AND OUTPUT CONNECTORS
Input Connectors
Use XLR (male) connectors to connect to the amplifier inputs and XLR (female)
connectors to line outputs.
See the wiring on the figures below.
Output Connectors
Use SpeakON NL2FC or NL4FC connectors to connect loudspeakers to the
amplifier individual channel outputs. For bridged connection or connection of two
channels via a single cable, use SpeakON NL4FC.
See the wiring on the figures below.
CAUTION! Never attempt to jumper or otherwise link up any pins of output
connectors.
21
3
2 1
3
-
1
1+
-
1
2+
1+
-
2
-
1
2+
1+
-
2
-
1
2+
1+
-
2
XLR (male) XLR (female)
Cold « – »
Shield (Ground)
Hot « + »
Cold « – »
Hot « + »
Shield (Ground)
NL2FC for individual channel mode
Output (+)
Output (–)
NL4FC or bridge mode
(only for Channels 1 & 3 connectors)
Output (+)
Output (–)
NL4FC for individual channel mode
Output (+)
Output (–)
NL4FC for linking up two channels
with a single connector
(only for Channels 1 & 3 connectors)
Channel 1 (3)
Output (+)
Channel 1 (3)
Output (–)
Channel 2 (4)
Output (–)
Channel 2 (4)
Output (+)
10

11
RACK-MOUNTING REQUIREMENTS
The amplifier is designed to fit a standard 19” rack. While mounting, make sure to
provide unhindered air access to the front and rear sides of the rack. Fan direction is from
front to back. It is not necessary to leave empty space above or below the amplifier.
For stationary use, it will be enough to fix securely only the front panel of the amplifier
to the rack. However, never attempt to transport the unit unless its rear end is properly
supported and/or securely fixed, as it may be fraught with danger of damage.
AC POWER REQUIREMENTS
The amplifier is supplied with a three-conductor grounded AC power cord, and
should be plugged into a standard 3-wire grounded electrical outlet, which supplies
230VAC 50/60Hz.
In the event of line voltage sag, the amplifier without PFC will continue to operate
normally, albeit with less power. The mains lower voltage limit for the amplifier to retain its
operability is ~160V.
The amplifier with PFC (DF2008DSP) operates at the mains voltage range from
~160V to ~250V, giving the full rated output power.
The amplifier is connected to the mains via cable, supplied with the amplifier. When
connecting to mains, make sure that no other devices with high power consumption are
connected to it, as the normal operation of several such devices may be impossible.
The actual AC current consumption depends on the audio signal level and the load
impedance. For system design purposes it must be noted, that for typical audio program
material the amplifiers, driving all channels at nominal impedance, just peaking at the
clipping level, have the following average power consumption:
– 2.2 A* for amplifier DF1404DSP at 4 Ohm load;
– 1.2 A* for amplifier DF1404DSP at 8 Ohm load;
– 2.2 A* for amplifier DF1408DSP at 8 Ohm load;
– 3.2A* for amplifier DF2008DSP at 8 Ohm load;
– 4.5A* for amplifier DF2804DSP at 4 Ohm load;
– 2.3A* for amplifier DF2804DSP at 8 Ohm load.
* At the mains voltage 230V AC. For the amplifier with PFC (DF2008DSP) in the low mains
voltage, the current consumption increases.
In order to reduce the AC hum, please, plug all sound equipment, interconnected with
signal cables, into the same power mains outlet.

AMPLIFIER OPERATION MODES
The amplifier can operate in four-, three- and two-channel modes (respectively: each
channel independently, the two channels in a bridge mode and the other two separately,
two pairs of channels in a bridge mode). The amplifier has two input channels. Signals
routing for four channels is performed by the DSP engine.
DSP settings control, presets storing and the creation of the original signal
processing template is performed by personal computer with SigmaStudio editor, installed
to it. Setting the high-pass filter and crossover filter parameters, EQ settings, desired
signal delay, as well as a number of other parameters can be performed by the DSP
engine, as described in SigmaStudio User Manual .
For the consumer’s convenience the amplifier has 8 presets, which provides a
number of the most frequently used switch configurations and settings. DSP presets
settings and block diagrams of the connections to the amplifier are in the Owner’s Manual.
Switching the amplifier DSP presets is performed by the DIP switch, located on the rear
panel of the amplifier.
12

13
SPECIFICATIONS
Number of output channels 4
Number of input channels 2
Number of operating modes 8
Output Power *:
– DF1404DSP 4 x 350/200W (4/8Ohm, 230V)
2 x 700W (bridge, 8Ohm, 230V)*
– DF1408DSP 4 x 350W (8Ohm, 230V)
2 x 700W (bridge, 16Ohm, 230V)*
– DF2008DSP 4 x 500Вт (8Ohm, 160–250V)
2 x 1000W (bridge, 16Ohm, 160-250V)*
– DF2804DSP 4 x 700/380W (4/8Ohm, 230V)
2 x 1400W (bridge, 8Ohm, 230V)*
Frequency Response 20Hz – 20kHz (±0.5dB, Pnom.)
Total Harmonic Distorsion 0.05% (20Hz – 20kHz)
Slew Rate 20/40V/µs (channel / bridge)
Damping Factor over 200 (200Hz, 8Ohm)
Channel Separation 60dB (1kHz)
Signal-to-Noise Ratio 95dB (unweighted)
Input Impedance 10kOhm (balanced)
Sensitivity 0.775V
Maximum Input Level 2.45V (+10dBu)
Power Requirements** ~230V, 50/60Hz
Weight:
– DF1404DSP, DF1408DSP 6.8kg
– DF2008DSP 7.4kg
– DF2804DSP 7.6kg
Dimensions 482mm (W), 96mm (H), 462mm (D)
Built-in DSP: Sampling rate – 48kHz.
DAC/ADC – 24-bit.
Internal processing – 56-bit.
2 inputs, 4 outputs.
Note.
* Bridge mode for channels 1-2 and 3-4.
** For the DF2008DSP amplifier at the mains voltage range ~160-250V.

OPERATING CONDITIONS
Ambient Temperature 5 ... 35°C
Atmosphefic Pressure 86.6 ... 106.7kPa (650 ... 800mmHG)
Relative Humidity less than 80%
14

445 max
482
466
DIMENSIONS
15
76
88
96
38
324 362

Preset 000 «Full Range»
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING
THROUGH CH3-4 CH1-2 THROUGH
USB
DSP
PRESET
CH 2
CH 1CH 2
SPEAKER OUTPUTS
4 min
4 min
1
1
2
2
1
1
4 min
8 min
1
2
CH 4
CH 3CH 4
4 min
4 min
1
1
2
2
1
1
4 min
(CH3-4)
8 min
1
2
BRIDGE
(CH1-2)
BRIDGE
MAINS IN
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
1 2
3
ON
PUSH PUSH
-
1
1+
-
1
1+
To Full Range Speakers
To Input Signal Source
LeftRight To Full Range Speakers
Right Right
Left Left
FULL RANGE
Ch1
Input Speaker Outputs
Ch2
Ch3
Ch4
( )
Ch1-2 L
( )
Ch3-4 R
LeftLeft
Right
Right
Ch1Ch2Ch3Ch4 Speaker Outputs
Function Full Range
Routing Input Ch1-2 (gain 0dB)
HPF Freq. 35Hz
HPF Type BTW 24dB/oct
Function Full Range
Routing Input Ch1-2 (gain 0dB)
HPF Freq. 35Hz
HPF Type BTW 24dB/oct
Function Full Range
Routing Input Ch3-4 (gain 0dB)
HPF Freq. 35Hz
HPF Type BTW 24dB/oct
Function Full Range
Routing Input Ch3-4 (gain 0dB)
HPF Freq. 35Hz
HPF Type BTW 24dB/oct
Attachment
20 100 1k 10k
-14
-10
-5
0
5
dB
Hz
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No Serial
16

17
Preset 001 «Bridge Full Range»
To Full Range Speaker
To Input Signal Source
LeftRight To Full Range Speaker
Right
Left
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTSINSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING
THROUGH CH3-4 CH1-2 THROUGH
USB
DSP
PRESET
CH 2
CH 1CH 2
SPEAKER OUTPUTS
4 min
4 min
1
1
2
2
1
1
4 min
8 min
1
2
CH 4
CH 3
4
CH
4 min
4 min
1
1
2
2
1
1
4 min
( )
CH3-4
8 min
1
2
BRIDGE
( )
CH1-2
BRIDGE MAINS IN
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
1 2
3
ON
PUSH PUSH
2+
1+
2+
1+
BRIDGE
FULL RANGE
Ch1Ch2Ch3Ch4
Bridge Ch1-2
Input Speaker Outputs
( )
Ch1-2 L
( )
Ch3-4 R
Left
Right
Speaker Outputs
Function Bridge Full Range
Routing Input Ch3-4 (gain 0dB)
HPF Freq. 35Hz
HPF Type BTW 24dB/oct
Function Bridge Full Range
Routing Input Ch1-2 (gain 0dB)
HPF Freq. 35Hz
HPF Type BTW 24dB/oct
Bridge Ch3-4
20 100 1k 10k
-14
-10
-5
0
5
dB
Hz
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No Serial

«Subwoofer + 2 Satellite (100Hz)»
To Subwoofer
To Input Signal Source
Left To Satellite
Left
CH1-2 THROUGH
CH 2
CH 1CH 2
SPEAKER OUTPUTS
4 min
4 min
1
1
2
2
1
1
4 min
8 min
1
2
CH 4
CH 3
4
CH
4 min
4 min
1
1
2
2
1
1
4 min
( )
CH3-4
8 min
1
2
BRIDGE
( )
CH1-2
BRIDGE MAINS IN
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
PUSH
2+
1+
-
1
1+
Right
Bridge Ch1-2
Speaker Outputs
Ch2
Ch3
Ch4
Sub
Sat L
Sat R
Function Satellite Right
Routing Input Ch 3-4 (gain 0dB)
HPF Freq. 1 00 Hz
HPF Type LR 24dB/oct.
Function Satellite Left
Routing Input Ch1-2 (gain 0dB)
HPF Freq. 1 00 Hz
HPF Type LR 24dB/oct.
Input
( )
Ch1-2 L
( )
Ch3-4 R
Function Bridge Subwoofer (L+R)
Routing Input Ch1-2 (gain 0dB)
Input Ch3-4 (gain 0dB)
HPF Freq. 35Hz
HPF Type BTW 24dB/oct.
LPF Freq. 100 Hz
LPF Type LR 24 dB/oct.
20 100 1k 10k
-14
-10
-5
0
5
dB
Hz
Park Audio M ade i n Ukraine
No Serial
Preset 010
Right
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTSINSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING
THROUGH CH3-4
USB
DSP
PRESET
1 2
3
ON
PUSH
SUBWOOFER
+
2 SATELLITE
Speaker Outputs Ch1
Ch2Ch3Ch4
18