LDA BA-2250 User manual

User's Manual
Model: BA-Series

Table of Content
1 SAFETY INSTRUCTIONS............................................................................................................. 1
2 DESCRIPTION............................................................................................................................... 2
3 FRONT PANEL.............................................................................................................................. 3
4 REAR PANEL................................................................................................................................ 4
5 SPEAKERS CONNECTION.......................................................................................................... 5
5.1 Low impedance speaker connection. 8 (BA-2250) or 4 (BA-2500)Ω Ω ................................... 5
5.2 High impedance speaker connection. 100V.............................................................................. 5
5.3 Wrong speaker connection......................................................................................................... 6
6 BLOCK DIAGRAM........................................................................................................................ 7
7 MAINTENANCE............................................................................................................................. 8
8 TECHNICAL SPECIFICATIONS................................................................................................... 9
Appendix A: Cable section for speaker lines.............................................................................. 10
Figures
Figure 1: BA Series Front View..............................................................................................3
Figure 2: BA Series Rear View ............................................................................................. 4
Figure 3: Low impedande speaker connection 8 (BA-2250) or 4 (BA-2500)Ω Ω ..................5
Figure 4: High impedance speakers connection 100V..........................................................6
Figure 5: Wrong speaker connection ....................................................................................6
Figure 6: BA Series Block diagram........................................................................................7
Tables
Table 1: Technical Specifications...........................................................................................9
Table 2: Cable section for 100V lines.................................................................................. 10

1 SAFETY INSTRUCTIONS
Please read carefully these safety instructions.
1. Keep this User Manual for future reference.
2. Power connector must be accesible, place the power cord where people will not step or
stumble. Unplug the equipment from the AC before cleaning..
3. Liquid-filled objects must not be placed on the equipment. Do not use liquid or sprayed
detergent for cleaning. Do not expose this equipment to humidity.
4. Free flame sources such as candles must not be placed on the equipment.
5. Install this equipment in a safe surface. If the equipment is not in a safe surface, it may fall
and be damaged.
6. The openings on the enclosure are for air convection. DO NOT COVER THE OPENINGS.
Leave a 5 cm gap around them to allow the proper air convention.
7. Never open the equipment. For safety reasons, the equipment should only be opened by
qualified personnel.
8. The equipment must be connected to plug with protective earth
9. Let staff check the equipment if any of these situations occurs:
a) The power cord or power plug is damaged.
b) Liquid has penetrated inside the equipment.
c) The equipment has been exposed to moisture.
d) The equipment does not work well or does not work according to the instruction
manual.
e) The equipment was dropped and damaged.
f) If the equipment has obvious signs of damage.
10. The connections must be made only by qualified personnel. Disconnect the audio inputs
and outputs while making connections. Be sure to use the proper cables to make the
connections..
LDA Audio Tech - Severo Ochoa Nº 31- 29590 MÁLAGA, ESPAÑA. Tlf: [phone]
User's manual: BA Series

2 DESCRIPTION
The SIMAX BA Series amplifiers are specially designed for professional installations where
eficiency is a relevant factor. Thanks to its class D amplification technology and its switched mode
power supply achieves a power consumption efficiency of 85%, dissipating less heat and
occupying only one height of a 19" rack.
The BA series has two types of two channels amplifiers: 250 W rms (BA 2250) and 500 W
rms (BA 2500), that are protected against short circuit and overload. Thanks to its flexible design it
allows both 100V high impedance and low impedance stereo 8 ohms (BA 2250) or 4 ohms (BA
2500) public address systems. Each channel integrates a high pass filter and an automatic
standby for noise gate, whose operation can be activated from the rear panel.
1. Universal 230/115V ~ 50/60Hz switched mode power supply
2. Class D amplifier with an 85% eficiency
3. Two channel amplifier in 19” rack
4. 250W rms (BA 2250) and 500 W rms (BA 2500) power rating per channel
5. Two independent output channels 8Ω / 100V (BA 2250) and 4Ω / 100V (BA 2500)
6. XLR balanced input through phoenix connector
7. Independent gain control per channel
8. High pass filter per channel
9. Automatic standby by integrated noise gate to save energy
10. Independent channel indicators for input and output protection
11. Short circuit, overload and overheat protection
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3 FRONT PANEL
1. PROT/STBY: This indicator shows two different statuses:
•PROT: protection indicator. The indicator will light up orange when the amplifier is in
protection condition. Protection may be because of a short circuit in the speaker line,
the amplifier overload and when the inside temperature is over 55ºC (131 ºF). There's
and independent protection indicator for each channel.
•STBY: stand by. The same indicator will light up orange when the amplifier is in stand
by due to not detecting any sinal for more than two minutes.The indicator will switch off
when the system detects the signal again. This function is programmable through the
switch located on the rear panel.
2. CLIP: The clip indicator will light red when the input or output is too high. There ir an
independent CLIP indicator for each channel
3. INPUT: The input indicator will light green when an input signal is detected. There is an
independent input indicator for each channel.
4. OUTPUT: The output indicator will light green when there is an output signal. El indicador
de salida se iluminará en verde hay señal de salida. There is an independent output
indicator for each channel.
5. POW R: The power indicator will light blue when the equipment is on.
6. POW R SWITCH: It allows to switch the equipment on and off.
LDA Audio Tech - Severo Ochoa Nº 31- 29590 MÁLAGA, ESPAÑA. Tlf: [phone]
User's manual: BA Series
Figure 1: BA Series Front View

4 REAR PANEL
1. AC POW R CORD: AC Power Cord to 110V – 230V input. The rated power of the
equipment is self switchable.
2. GAIN CONTROL: Allows the adjustment of the input sensitivity. There is an independent
gain control for each channel.
3. LIN INPUT: The line input supports balanced and unbalanced audio inputs. These inputs
are supplied through 3 pin and 3,818mm euroblock connectors (provided with the
equipment). Cable section range for each pole of this connector: 0,14 → 1,5mm2 (30 → 14
AWG). There is an independent line per channel.
4. 100V SP AK R OUTPUT: The speakers output for high impedance lines (100V) must be
connected between the positive and negative terminals of the output connector, according
to the speakers' polarity. The amplifier has two independent output channels. These outputs
are connected through 3 pin and 5,08mm euroblock connectors (provided with the
equipment). Cable section range for each pole of this connector: 0,5 → 2,5mm2 (22 → 12
AWG).
Never join the positive and negative ends, it can cause a short circuit.
Never connect the low impedance speaker to these 100V ends, it could damage the
speaker.
5. HIGH PASS FILT R: The high pass filter function will activate or deactivate according to
the two channel configuration through the dip switch. There are two high pass filter
independent channels.
6. AUTO-STANDBY: The auto standby function will activate or deactivate according to the
two channel configuration through the dip switch. It will activate when no input signal is
detected for 2 minutes. The amplifier will activate inmediatly when an input signal over
40dB is detected.
7. 8 (BA-2250) or 4 (BA-2500) SPEAKER OUTPUT:Ω Ω The speakers output for low
impedance lines (8Ω (BA-2250) or 4Ω (BA-2500) ) must be connected between the Positive
and COM terminals of the output connector, according to the speaker polarity. The amplifier
has two independent output channels. These outputs are connected through 3 pin and
5,08mm euroblock connectors (provided with the equipment). Cable section range for each
pole of this connector: 0,5 → 2,5mm2 (22 → 12 AWG).
Never join the positive and negative ends, it can cause a short circuit.
Never connect the low impedance speaker to these 100V ends, it could damage the
speaker.
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Figure 2: BA Series Rear View

5 SPEAKERS CONNECTION
5.1 Low impedance speaker connection. 8 (ΩBA-2250) or 4 (ΩBA-2500)
To connect conventional 8Ω (BA 2250) or 4Ω (BA 2500) speakers, connect the positive side
(+) tp the 8Ω(BA 2250) or 4Ω (BA 2500) terminal. Connect the negative side (-) to the COM
terminal.
5.2 High impedance speaker connection. 100V
To connect a low impedance speaker system (100V) in parallel, connect the positive side of
the speaker (+) to the 100V terminal. Connect the negative side (-) to the COM terminal.
LDA Audio Tech - Severo Ochoa Nº 31- 29590 MÁLAGA, ESPAÑA. Tlf: [phone]
User's manual: BA Series
Figure 3: Low impedande speaker connection 8 (BA-2250)Ω
or 4 (BA-2500)Ω
Figure 4: High impedance speakers connection 100V

5.3 Wrong speaker connection
Do not connect high and low impedance speakers simultaneously, it could damage the
equipment.
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Figure 5: Wrong speaker connection

6 BLOCK DIAGRAM
LDA Audio Tech - Severo Ochoa Nº 31- 29590 MÁLAGA, ESPAÑA. Tlf: [phone]
User's manual: BA Series
Figure 6: BA Series Block diagram

7 MAINTENANCE
The equipment requires a limited periodic maintenance.
The regularity of the maintenance must be in accordance with the equipment intallation
conditions. It is advisable to set at least a maximum period of a year.
Warnings:
•Use only a soft lint free cloth
•Disconnect the equipment from any external power source.
•Disconnect all the external devices.
•Keep the equipment away from any liquid.
•Do not use aerosoles, solvents or abrasive substances.
•Do not spray any cleanser directly on the equipment.
Operations:
•Clean the equipment with a damp cloth.
•Clean the air inlets and outlets of the equipment with a vacuum.
•Check the equipment and ground connections.
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8 TECHNICAL SPECIFICATIONS
Model BA-2250 BA-2500
Output Power
115V AC 230V AC 115V AC 230V AC
2 x D Class, 250 Wrms 2 x D Class, 500Wrms 2 x D Class, 500Wrms
Min load 40 / 8ΩΩMin load 20 / 4ΩΩ
Distortion (1KHz/ 3dBv,
100W)
115V AC 230V AC 115V AC 230V AC
<0,1% <0,5% (20 Ohm);
<0,2% (4 Ohm)
<0,1% (20 Ohm);
<0,2% (4 Ohm)
Frecuency esponse L/H Cut OFF 20Hz 20KHz (+1/ 2dB)
L/H Cut ON 70Hz 10KHz (+1/ 3dB)
L/H Cut OFF 20Hz-20KHz (+1/-3dB)
L/H Cut ON 70Hz-10KHz (+1/-3dB)
Signal to noise ratio >80dB, A - weighted
Crosstalk >60dB, 1KHz, max output
Speaker outputs 2x100V / 8Ω. 2 Pin, Euroblock type
(3 pin connector)
2x100V / 4Ω. 2 Pin, Euroblock type (3 pin
connector)
Audio inputs 2 x Balanced Audio 1Vp, 0,707Vrms. 10 K , 3Pin, Euroblock TypeΩ
Protection Over-Temperature, DC voltage, Short-circuit, Overload
Power supply 115 / 230V~ 50/60Hz. Automatic. 2m / 6,56ft (UE type) power cord
Consumption 550W max / 100W a 1/8 output
power 1100W max / 140W a 1/8 output power
Operating conditions -5 ºC to +45 ºC / 23 ºF to 113 ºF
5% to 95% elative humidity (no condensation)
Finish
Front: Al, Black AL 9005
ear: Fe, Black AL 9005
Box: Fe, Black AL 9005
Weight 7,5 Kg / 16 lb 8,5 Kg / 18,7 lb
Dimensions (W x H x D) 482mm x 44mm x 420mm / 19 x 1,73 x 16,53” ” ”
Accesories Euroblock male type connectors
Table 1: Technical Specifications
LDA Audio Tech - Severo Ochoa Nº 31- 29590 MÁLAGA, ESPAÑA. Tlf: [phone]
User's manual: BA Series

Appendix A: Cable section for speaker lines
This table shows the maximum advisable lenghts for 100V speaker lines. The type of cable
used to calculate them is a copper conductive twin-lead type. This can be used as planification
guide, although the appropiate final calculations for each situation are the electrician's
responsibility.
This table shows the output power of common amplification channels of 100V constant
voltage in RMS. The maximum lenght for 70V lines is half of the ones in the table.
Section Maximum lenght with a 5% power loss
AWG  mm mm20Wrms 120Wrms 240Wrms 480Wrms 9 0Wrms
6 4,11 13,3 3260 1630 810 405 200
7 3,67 10,6 2600 1300 645 320 160
8 3,26 8,35 2050 1025 510 255 130
9 2,91 6,62 1625 810 405 200 100
10 2,59 5,27 1300 645 320 160 80
11 2,3 4,15 1020 510 255 130 65
12 2,05 3,31 810 405 200 100 50
13 1,83 2,63 645 320 160 80 40
14 1,63 2,08 510 255 130 65 35
15 1,45 1,65 405 200 100 50 25
16 1,29 1,31 320 160 80 40 20
17 1,15 1,04 255 130 65 35 15
18 1,02 0,82 200 100 50 25 13
Table 2: Cable section for 100V lines
Key:
•AWG (American Wire Gauge)
•mm: Cable diameter in milimeters
•mm2: section cable area in square milimeters
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Ver. 2