Peecker Sound JADSP1250 User manual

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SOUND REINFORCEMENT CONTROLLED RADIATION ACOUSTIC RESEARCH
CONTROLLED RADIATION
CONTROLLED RADIATION
User’s Manual JADSP1250
1
JADSP1250
USER'S MANUAL

Via Monti Urali, 29 – 42122 Reggio Emilia (Italy) • Telephone: [phone] • [e-mail]
General Information
JADSP1250 is a power amplifier with built-in DSP and white and pink noise generator. It
was born to power loudspeaker systems of JA12, JASW12 and JA4012 Peecker Sound
Architectural Acoustics Series, with factory DSP preset dedicated to these speakers and
switchable through a hardware switch. The settings of the DSP on board are further
adjustable in real time via PC remote control. This system is supplied with limiters
dedicated to the specific JA12, JASW12 and JA4012 Peecker Sound speakers.
Thanks to this type of class D amplifier, weight and volume result limited in order to
guarantee an easy transportability.
Applications:
JADSP1250 is used to control a JA12 dodecahedric source (with or without JASW 12
subwoofer) in the measurements of building and architectural acoustics (acoustic
insulation, acoustic absorbtion, reverberation time, impulse responses measurements,
acoustic parameters of halls, passive requirements of the buildings) or JA4012 directional
source in the measurements of front wall insulation.
Conformity Declaration
This device conforms to requirements of 89/336/EEC Electromagnetic
Compatibility Directive, and concerning 92/31/EEC supplements, and to the
requirements of 73/23/EEC Low Tension Directive, and concerning 93/68/EEC
supplement.
Rules applied:
EN55103-1 (Emissions)
EN55103-2 (Immunity)
EN60065, Class I (Safety)
Important Safety Instructions
This symbol indicates important use instructions and information which pay
particular attention to, for a correct use of this product.
This symbol indicates “dangerous tension” that can cause a risk of electric
shock. Pay particular attention and operate with caution.
1. Follow carefully the content of all the documents enclosed to the product and save them
for future reference.
2. Observe instructions.

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3. Save the package and check that all goods are in excellent conditions.
4. Do not use near water, do not split water or other liquids onto the amplifier. Pay
attention not to use with wet hands and feet in water.
5. Do not use near heat sources like radiators, stoves or other devices producing heat.
6. Check that the power cable is undamaged. Do not step on the cable and pay attention
not to press the plug.
7. Connect the plug to a ground port. Do not tamper with the plug. If the plug supplied is
not compatible with your port, contact an electrician for the replacement.
8. Connect to power means with a tension as high as indicated on the amplifier.
9. Install the amplifier according to instructions.
10. Do not obstruct the air vent.
11. Disconnect in case of thunderstorm and when not used.
12. Connect only according to instructions.
13. Do not connect an input signal exceeding what indicated in the manual.
14. Do not connect the output of the amplifier to the input of another channel.
15. Do not connect an output of the amplifier to any power source like batteries, feeders or
mains plug, apart from the fact that the amplifier is on or off.
16. Keep the controls of volume to the minimum during the amplifier switching on or off.
17. Do not move the panel, otherwise there would be a risk of an electric shock.
18. Do not try to repair this product, but contact qualified personnel.
19. Clean only with a dry duster.
20. This product must be handled by qualified personnel when:
- the power cable or the plug are damaged
- the product has been exposed to rain or wetness
- some liquid has got into the unit
- some object fell onto the unit
- the unit fell down and was damaged
- the product seems not to work correctly or shows a remarkable change of
performance.
21. A careful supervisory control is necessary, if the product is used in the presence of
children or by inexperienced adults.

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22. This product might produce levels of sound able to damage hearing. Pay particular
attention and do not work at high or uncomfortable levels of volume for long. In case
of troubles or loss of hearing, consult an audiometric specialist.
Connection to the Means and Absorbtion
Check that you have power enough for the amplifier (verify the data at the end of this
manual). The electric mains voltage must be the same as indicated on the panel of the
amplifier.
Pay attention: before making any audio connection remember that it is a goods
rule to switch off the amplifier (by turning PowerCon connector anticlockwise)
and to keep the level of the input signal to the minimum, during the switching on.
User’s Liability
Dangerous Output Tensions
Amplifiers can generate dangerous output tensions. Do not touch the possible
uncovered cables of cone loudspeakers while the amplifier is working.
Output Connections
Before connecting an output charge to an amplifier the user stands liable for
checking that the connection falls into the specifications of this device in order
not to damage the amplifier and/or the charge.
Radio Interferences
A sample of this product was tested and homologated according to the limits of the
Electromagnetic Compatibility Directive (EMC). These limits have been fixed to give a
reasonable protection from the dangerous interferences of electric devices. If not installed
or used according to the present instructions for use, this product might interfere with other
devices, for instance radio receivers. Otherwise, the possibility of interferences in a
particular installation is not ruled out in any case. If the product interferes with devices of
reception and transmission (this condition can be verified by turning the device on and off),
the user would have to try to eliminate the interference observing one or more of the
following measures:
Increasing the distance between the device and the receiver.
Connecting the device to a port placed on a circuit different from the one the receiver is connected
to.
Turning or move the aerial of the reception device.
Checking that the concerned unit conforms to the EMC immunity limits (it must have the EC brand).
All the electric devices sold in EEC must be homologated referring to the immunity from
electromagnetic fields, high tensions and radio interferences.
Contact qualified personnel.

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Precautions of Use
Placing:
Open JADSP1250 forming an acute angle between the panel and the lid and position it
upright (Figure 1). Remove all the obstructions from ventilation holes.
Figure 1: JADSP1250 in working position
Cooling:
Check carefully the conditions of ventilation/cooling of the amplifier. A forced air inside
system, through a variable speed fan, allows the dissipation of heat generated by power
components. Check carefully that there is room enough on the front side of the amplifier to
allow air to get in and to the hot air to get out. Do not put on objects that could obstruct the
ventilation opening.
Customer Service Information:
To ask for maintenance, please contact the PEECKER SOUND Customer Service,
Distributor, Dealer, nearest to you, or Sound Corporation (Italy).
Front Panel
The front panel is made of the following elements, numbers refer to the numbered scheme
of Figure 2.
1. Fan Control
Clean contact control output to stop the fan of the UPS-JA-BT optional device when the
JADSP1250 noise generator gets muted.
2. Mute
Red led indicator of noise muting (noise is muted by the radio controller)

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3. Active
Green led indicator of inside noise generator activity (activated by button 4)
4. Button for inside generator activating
5. Pink noise / White noise
Button for switching between pink and white noise
6. Level
Potentiometer for reduction of the noise generated level (from –inf dB to max)
7. USB
USB port for DSP remote control from PC (see paragraph “DSP Remote Control”)
8. Network, Link
Link for network PC control (see paragraph “DSP Remote Control”)
9. Network, Input
Input for network PC control (see paragraph “DSP Remote Control”)
10. Audio, Link
XLR male connector for the link of the signal present in [11.Audio,input] to another device
11. Audio, Input
XLR female connector for the input to the DSP, max 10 dBu (active when noise generator
is deactivated)
12. Preset, JA12/JA40
Switch for two factory presets for JA12 dodecahedron (with or without JASW12 subwoofer)
and for directional speaker JA4012
13. User DSP, ON/OFF
Switch on and off for the additional processing set by PC control
14. On, Signal, Limit
Indicator leds for power on, input signal presence and limiter engagement (see paragraph
“Protection Characteristics”)
15. Output
Power audio output NL4 (4 poles) SpeakOn connector with pinout scheme (see paragraph
“Connections”)
16. AC Line Iput Mains
PowerCon connector for mains supply from electric mains
17. Fuse

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Figure 2: JADSP1250 front panel and numbered scheme

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Protection Characteristics
This power amplifier has a long service life thanks to its systems protecting the amplifier
and its charge.
Peak Limiter:
It is the last block in the DSP chain (see Figure 10): it is set to prevent the amplifier output
signal from exceeding the power peaks that special transducers used can handle. This
limiter abates the gain when a threshold is exceeded and it releases this abatement in a
brief time. The peak limiter is not disconnectable. Thresholds set on the different outputs
and in the different DSP presets are closely united to the special systems of cone
loudspeakers this amplifier was designed for, as specified below.
“RMS” Limiter:
It is an analogic limiter placed at the amplifier output with time of analysis and intervention
longer than the peak limiter. It works supplementarly to the peak limiter and it allows not to
exceed the thermal thresholds of power tight of transducers. Exceeding this threshold
would cause a proportionate decrease of the gain, that occurs in a hearable way in a few
seconds. The gain is reactivated in case of decrease of the input signal. RMS limiter is not
disconnectable. The threshold set is closely united to the special systems of transducers
this amplifier was designed for, as specified below.
Temperature and Power Value Protection:
This amplifier is supplied with sensors of temperature and it can measure the output
power. When one of these values exceeds an extreme value for a certain time, the system
protects itself by decreasing the gain. The persistence of the conditions of threshold
exceeding would cause the amplifier switch off. The trend of power and temperature
values and of all the protection interventions in the last three days of actual use is plotted
on a graph on the panel of software DSP control and it can be saved in a numerical
format, Figure 3.
Figure 3: Software of DSP control – Monitoring panel

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Charge Safety Control:
The charge is constantly measured and displayed on the software panel if its value
exceeds a factory set range.
DC Protection:
The presence of output direct current is monitored: in that case the output stage of the
amplifier and the switching power supply would be inhibited. This allows to protect the
cone loudspeakers from direct current. It is enough to turn off and restart the amplifier to
reactivate it.
Protection from Mains Power:
Mains input is supplied with a limiter for inrush current and fuse (outside) fluxes. System is
automatically protected and restarted in case of voltage drop. It is supplied with a system
of automatic adaptation to all the values of mains tension included between
115 and 230 V.
Noise Generator
It is supplied with two buttons, one to activate the noise generator (button 4. - Figure 2),
the other to select white and pink noise (5. Pink noise / White noise – Figure 2). The green
led (3. Active - Figure 2) indicates that the noise generator is on.
By a remote control supplied it is possible to activate the noise muting (that is to stop the
generated noise) from a remote place. The noise muting is indicated by the red led (2.
Mute – Figure 2). Activating the noise muting causes the switching off of the cooling fan for
a few seconds. It allows to perform measures of noise stopping without the disturbing
noise of the fan.
Figure 4: JA-BT optional device
With the JA-BT optional device (a battery power kit with an inverter to use the devices
without mains – Figure 4), the “JA-BT FAN CONTROL” connector allows to connect JA-BT
to JADSP1250 causing the switching off of JA-BT fan while the noise muting is activated.
“LEVEL” potentiometer allows to dose the amplitude of the noise sent to the amplifier. With
the switch OFF (13. User DSP – Figure 2), that is DSP control off, and the switch 5. set on
“pink noise”, turning completely the potentiometer clockwise (highest level) corresponds to
the maximum acoustic emission of the dodecahedron, without distortions or any thermal or
power protections.

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Amplifier and DSP
Input Stage:
The female XLR connector (10. Audio, input – Figure 2) allows to send an outside signal
straight to the input of the DSP by-passing the inside noise generator. The input is
possible only when the noise generator is off (button 4. turned up – Figure 2).
The male XLR connector (11. Audio, link – Figure 2) allows to make the talk through of this
signal to another device.
The yellow (“On”) and green (“Signal”) leds indicate respectively the ON status and the
presence of the DSP input signal (whether it comes from the inside generator or from
outside).
The red led indicates one of the following possible status:
saturation of the DSP input AD converter
intervention of the DSP peak limiter
intervention of the “RMS” limiter on the output of the amplifier
amplifier clip
It is possible to better detect which of these particular events is occurring by monitoring the
DSP via PC remote control. To that end please refer to the paragraph “DSP Remote
Control– Software” and to the Help on-line of the PS-NET Network Controller software.
Figure 5: JADSP1250 General Scheme
Switch for DSP Control:
The DSP on board is supplied with presets straight switchable from the hardware panel. A
main switch named “PRESETS” allows to switch the correct audio sets-up for:
1) JA12 dodecahedron (with or without the JASW12 subwoofer dedicated) – PRESET
named JA12
2) JA4012speaker for front insulation measurements – PRESET named JA40

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These two presets are factory set at the time of delivery and the user cannot modify them.
Audio sets include frequency cuts and the correct limitations for the particular systems of
loudspeakers which can be connected.
The intervention thresholds of the limiter are different fo r these two core prest es,
because they are m ade to power specific and different sp eakers: it is very im portant
always to set the right preset for the connect ed system of loudspeakers to get the
correct sound by the different speakers, but above all not to damage them.
A second switch named “DSP User” allows to activate an additional DSP processing to the
two core sounds. The parameters of this filtering are modified via PC remote control and
can be saved in file (.dse). With the “DSP User” switch set to “On”, the current audio set (if
the PC is connected) or the audio set at the last disconnection of the PC is activated. With
the “DSP User” switch set to “Off” the additional filter is deactivated and the sound heared
refers to the core presets. See paragraph “DSP Remote Control” for more details.
For further exlanations please refer to Figure 5.
Amplifier:
The two channel amplifier is made with switching tchnology and it can give 1250 W per
channel into 2 Ohm impedance. In case of use with the JA4012speaker for front insulation
measurements, the two channels are used to amplify respectively the transducers for low
and high frequencies, that is in bi-amplification mode. With the JA12 dodecahedron
channel 2 is used for the dodecahedron and channel 1 for the JASW12 subwoofer; the
subwoofer can be disconnected.
Connections:
A 4 poles female SpeakOn connector is supplied for the power audio output, with the
following pinout (Table 1), depending on the preset switched:
PRESET OUTPUT 1+
1- OUTPUT 2+ 2-
JA12 JASW12
(if present)
JA12
JA40 JA40 LF JA40 HF
Table 1: Amplifier output pinout
A 4 poles adpater cable is included in the package with male and female SpeakOn
connectors (Figure 6).
It must be always connected to the JA12 dodecahedron and it is for adapting the JA12
inside connections to the pinout described in Table 1 (This adapter turns JA12 into a sole
input on pins 2+ 2- with 3 Ohm impedance, suitable for JADSP1250 amplifier, by
connecting in parallel two 6 Ohm inputs natively supplied).

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Figure 6: Adapter cable for JA12
Pay attention never to connect the adapter cable straight to the JADSP1250 amplifier.
It is very important always to con nect the JA12 adapter cable in cascade to the usual 4
poles cable, not th e subwoofer signal to be wrongly sent to some
transducers of JA12 a nd damage them. After the first use of the JADSP1250 -
JA12 couple it is suggested to leave the adapter cable connected to the
dodecahedron for the following uses of JA12 and to consider it an integral part of it.
Therefore the following output connections are possible:
only JA12 dodecahedron (preset “JA12”): 4 poles speakon cable, plus adapter
cable (always to leave connected to the dodecahedron) (Figure 7)
JA12 dodecahedron plus 40SW12 subwoofer (preset “JA12”): 4 poles speakon
cable between JADSP1250 and subwoofer, and link via 4 poles speakon plus
adapter cable (always to leave connected to the dodecahedron), between
JADSP1250 and JA12 dodecahedron (Figure 8)
JA4012 speaker for front wall insulation measurements (preset “JA40”): 4 poles
speakon cable (Figure 9).

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Figure 7: Connections to amplify only JA12. PRESET: “JA12”
Figure 8: Connections to amplify JA12 plus JASW12 subwoofer. PRESET: “JA12”
Figure 9: Connections for JA4012 directional source. PRESET: “JA40”
DSP Remote Control
Hardware connections for Remote Control:
The USB connector allows to make the remote control of the DSP, to be more exact of the
part of the DSP dedicated to the user's control, as explained above. To do it, it is
necessary to install the PS-NET Network Controller software, available in the enclosed CD
(see the following paragraph).
The two EtherCon connectors are useful only in presence of other Sound Corporation
products with DSP on board, like X-Treme ampified speakers and processors. They must
be supported by XT-NETINT additional device. It allows to create a protocol on CAT. cable
(with RJ45 connectors) and to connect several products with DSP in cascade up to a one
kilometer cable, as it can singularly operate on each of them from the Network Controller
software.
ADAPTER CABLE ADAPTER CABLE

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Software
For the remote control it is necessary to install on a Windows PC the PS-NET Network Controller
software available in the enclosed CD. This sytem works well also on Apple Computer as long as
Windows is installed through Boot Camp or Leopard. To work, this software must be supported by
Microsoft DotNetV2SP1 framework, available in the enclosed CD, if it is not already installed on
your PC.
The remote control allows the user to use an input filtering (Figures 4 and 9): threfore it must be
considered additional to the two factory presets, and it is activated by switch 13 User DSP (Figure
2) (regardless of the factory preset selected by the other switch). It allows to get signal muting,
gain, equalizations (8 bands and 2 shelvings), LP and HP frequency cuts, delay and two unrelated
level attenuations on two output channels. The DSP scheme is in Figure 10. The software panel of
remote control is in Figure 11.
Figure 10: DSP scheme.
The grey part is not visible and can be modified only by switching one of the available presets.
Figure 11: Software panel for user’s DSP control
How to connect:
Install the USB driver available in the enclosed CD too. Connect the USB cable to the PC and
JADSP1250 ports and start the Network Controller up. To log on select from menu Networks ->
Add networks and select the USB port found. Then click on the red triangle that will become green
after the conection has been established. The Network Controller is supplied with a Help on-line for
all the possibile operations.

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TECHNICAL SPECIFICATIONS
DSP+Amplifier
Input impedance: 5.5k Ohm unbalanced 11k balanced
Max Input level: +10dBu
Output noise : -113dB A-weighted, referenced to maximum output (22kHz
bandwidth)
Distortion: <0.05% @ 1kHz -3dB output (22kHz BW)
Frequency response: <10Hz - >20kHz +/- 0.25dB <5Hz - >30kHz +/- 1.0dB
Amplifier Section
Circuitry Class D
Number of channels: Two
Output power (program): 1250W RMS / ch. 20Hz-20kHz both channels driven into 2 Ω
Slew rate: >80V/us
Damping factor: 120 ref 8 Ohms
Efficiency: >90% typical
DSP
Sample rate: 96kHz
Frequency Resp: 20Hz - 20kHz+/-0.5dB, 10Hz - 40kHz +/- 1dB
Dynamic range : 110dB A (20Hz - 20kHz)
THD (20Hz–20kHz): <0.01%
Panel switches: 2 switches: JA12/JA40 speaker selector, PC control on/off
PC control software: PS-NET Network Controller
Noise generator
Panel Controls Activation and mute keys, pink/white switch, level knob
Amplifier protection systems
Over Current: Initially limiters applied, persistent over current causes shutdown
Temperature: Initially limiters applied, persistent over temperature causes
shutdown
Brownout: Automatic protection & recovery
Mains: Inrush current limiting
DC fault: Shut down power cycle to recover
Indicators and switches: Three LED: Power, Signal, Limit.
Load protection systems
JA12+JASW12 speaker system: DSP peak limiter + analog thermal limiter
JA4012speaker system: DSP peak limiter + analog thermal limiter
Connectors
Amplifier Input Connector Neutrik® XLR (Male)
Amplifier Link Connector Neutrik® XLR (Female)
Amplifier Output Connector Neutrik® NL4FC speakON
AC Power Connector Neutrik® powerCON
PC control USB type B
PC Network Control EtherCon input, EtherCON link
Power Supply
Type: High current, high freq. switch mode
Efficiency: >90% typical
Input voltage: 115v / 230v nominal +/- 10%
Input voltage selection: Automatic
Mains frequency range: 45 - 65Hz
Mains fuse : External, T10AT type recommended
Other features: Automatic soft-start, automatic brownout recovery, automatic over-
voltage protection, remote shutdown,
automatic power-save
Thermal
Semiconductor cooling: Conduction through base of module to an attached panel.
Internal cooling method: Convection (Assisted by a small internal low-speed Fan).
Physical
Height: 510 mm
Width: 290 mm
Depth: 240 mm
Weight: 4,7 kg