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Indoor Stadium - Sound System

Home Theatre Systems


Well-Known Member
May 26, 2010
Trivandrum, India
Hi all, I am back again with news of another project. Sometime ago, I had been called in to help set up the sound system for Asia's largest School Indoor Stadium, at one of Kerala's Top Schools. The dimensions of the Stadium are as follows:

Arena width - 40 meters
Arena length - 70 meters
Height of the Arena - 27 meters
There is also a stage at one end of the hall which is huge (25 meters open width and 18 meters from front of the stage to the back wall)

The stadium can be used in concert configuration and in sports configuration (has 2 basket ball courts, can also be configured for badminton, indoor tennis on carpet, volleyball, etc). Famous local rock outfits like "Avial" have performed at this arena.

After careful consideration of a number or probable local and imported options, I decided to go with Mackie systems as these American systems are the best I've heard, in internationally famous arenas like Madison Square Garden in New York and the Olympic Colosseum in Los Angeles. I have also heard Mackie at Austin Airport in TX. The school belongs to one of India's most prominant lineage of educational institutions and hence bringing in the best was extremely important. Budget was not quite a constraint :)

The equipment we procured for the arena are as follows:

1) 2 x Mackie HD 1801 18 inch Powered Subs:

Mackie HD1801 18" Powered Subwoofer Features at a Glance:

35Hz-to-145Hz operating range
Active electronics provide complete system optimization
Level control and polarity invert switch with LED indicator
Designed and tuned by Eastern Acoustic Works (EAW)
12 integrated M10 fly points
Signal/limit and thermal LED indicators
Rugged all-wood cabinet (15mm birch plywood)
Integrated protection and limiting circuitry
Dual XLR inputs, full-range and highpass outs
800W RMS/1600W peak power
133dB SPL max output (peak @ 1m)
Phase alignment to complement Mackie HD loudspeakers
Pole-mount receptacle for mounting full-range speaker
Precision tuning filters
Ported, direct-radiating design
1,600W of ultra-efficient Class D Fast Recovery amplification
Symmetrical Linkwitz-Riley crossover (100Hz, 24dB/octave)
18" high-output subwoofer with 4" voice coil

Mackie HD1801 Specs:

Powered/Unpowered : Powered
Power Configuration : Mono-amped
LF Driver Size : 1 x 18"
Total Power : 800W RMS / 1600W Peak
Impedance Input : 20k ohms (balanced)
Frequency Range : 44-95Hz
Crossover Frequency : 24dB/octave @ 100Hz
Maximum Peak SPL : 133dB
Enclosure Material : Plywood
Mounting Options : Floor only (pole socket on top)
Inputs : 2 x XLR
Outputs : 2 x XLR (high-pass); 2 x XLR (full-range)
Height : 23"
Width : 23"
Depth : 25.8"
Weight : 50.1 kg

2) 2 x Mackie HD 1521 2-Way High Definition Powered Loudspeakers:

Features at a glance:

1600W of ultra-efficient Class-D Fast Recovery amplification

LF 700W RMS / 1400W peak
HF 100W RMS / 200W peak
High-definition audio processing
Revolutionary patented acoustic correction
Transducer time alignment and phase correction
Precision 2-way crossover
Custom designed transducers by EAW
15 neodymium woofer with 3 voice coil
1.75 compression driver with heat-treated titanium diaphragm
User-adjustable 3-band contour EQ with sweepable mid-frequency
Ultra-compact and lightweight (80lbs)
Integrated limiting and protection circuitry
Rugged all wood cabinet (15mm birch plywood)
12 integrated fly points for horizontal and vertical rigging
Stand / pole mountable

Mackie HD 1521 specs:

Powered : Yes
Power Configuration : Bi-amped
LF Driver Size : 15"
HF Driver Size : 1.75"
LF Driver Power Amp : 700W RMS / 1400W Peak Class D
HF Driver Power Amp : 100W RMS / 200W Peak Class D
Total Power : 1600W
Frequency Range : 40Hz-20kHz (-10dB)
Crossover Frequency : 1200Hz
Maximum Peak SPL : 125dB
Horizontal Coverage Angle : 80 Degrees
Vertical Coverage Angle : 50 Degrees
Enclosure Material : 15mm Birch Plywood
Mounting Options : Pole, Floor Wedge, Fly
Inputs : 1 x XLR
Outputs : 1 x XLR
Height : 30"
Width : 18.3"
Depth : 18.8"
Weight : 41 kg

The HD 1801 and HD 1521 combos will be placed in the following configuration beside the stage area, at the front of the arena:

3) Mackie SRM 450 will line the walls of the Arena and the Balcony (Gallery):

SRM450 Specifications

Input Type : Balanced Differential
Input Impedance Line : 20k ohms
Input Protection : RFI and level protected
Sensitivity Line : +4 dBu
(center detent)
Mic : -36 dBu
Maximum Input Level : Line: +22 dBu
Low-Cut Frequency : 75Hz, Second-order filter
Acoustic Contour
Equalization Peaking : +3 dB @ 100Hz
+3 dB @ 12kHz
Enclosure Alignment :Sixth-Order
Over-Excursion Protection :Second-Order
High-Pass Filter
Thermal Protection : Amplifier shutdown, auto reset
Low-Line Voltage Shut Down : 60% Nominal line
Frequency Range (-10 dB) : 45Hz - 20KHz
Frequency Response : (3 dB) 55Hz - 18kHz
Maximum Peak SPL @ 1m : 127 dB
Low-Freq Crossover : 24 dB/octave, time offset corrected
High-Freq Crossover : 24 dB/octave
Crossover Frequency : 1.6kHz
Driver Protection : Independent LF and HF compressors
Low-Freq Roll-Off : Dynamic-signal level dependent
Accessory Interface : 15V DC, normalized signal I/O
Operating Temperature Range : -10C to 45 C
(14F to 113F)
Low-Frequency Transducer : Diameter 300mm (12")
Power Handling : 450 watts RMS
Frequency Range : 45Hz - 3kHz
Hi-Frequency Driver and Horn: Diaphragm Diameter 44mm (1.75")
Exit Throat Diameter : 25mm (1")
Diaphragm Material : Titanium
Sensitivity (1W@1m) : 106 dB
Power Handling : 100 watts RMS
Frequency Range : 1kHz - 20kHz
Horn Type Composite : Exponential and Conical
Mouth Size :305mm (12") W x 178mm (7") H

Horn Coverage :
Horizontal Coverage : 90
Vertical Coverage : 45

Power Amplifier and System:
Low-Frequency Power Amplifier:
Rated Power 300 watts RMS
Rated THD < 0.1%
Cooling: Convection Extrusion
Design: Class G, Parametric Servo Feedback
High-frequency amplifier:
Rated Power 100 watts @ High-Frequency Driver Impedance
Rated THD < 0.1%
Cooling: Convection Extrusion
Design :Conventional Class AB

Physical Properties:
Height 660mm (26")
Width 390mm (15.4")
Depth 376mm (14.8")
Weight 23.2kg
Enclosure Geometry: Asymmetrical Trapezoidal
Mounting Methods: Integrated mounting points, M10

Watch this space for more.
Last edited:


Well-Known Member
May 26, 2010
Trivandrum, India
On another note, for testing, Pink Floyd's Division Bell was played, sounded stunning on the fronts.