The 2734 is a compact class D power amplifier, intended for acoustical measurements in the field or laboratory.
All controls and connectors are placed on the front panel, enabling you to set up the 2734 very quickly,
and to operate it in horizontal or vertical position.
The 2734 is built into a robust flight case making it safe and easy to carry along.
There are two variants of the 2734. The 2734-A is the basic version, whereas the 2734-B includes a wireless audio receiver which can be used to send a stimulus to the amplifier. Both models can be operated remotely using the optional UA-1476 wireless remote control.
Features
- Compact and robust design, for horizontal and vertical use.
- 500 Watt into 4 Ohm output.
- All connectors and controls on front panel.
- Overload indicator monitors input, output and overheating.
- Quiet, no fan cooling required for room acoustic measurements.
- White and pink noise generator.
- Fully specified input and output characteristics.
- Outputs protected against short circuit, HF, DC and overload.
- Remote operation via cable or wireless remote control.
Specifications
MAXIMUM OUTPUT POWER
(TA = 25°C, 1 kHz, THD < 10%)
4 Ω: 500 W
6 Ω: 330 W
8 Ω: 250 W
CONTINUOUS OUTPUT POWER (1 kHz, 6 Ω)
With air filter: TA = 25°C: 250 W
Without air filter:
- TA = 25°C: 330 W
- TA = 35°C: 175 W
INPUT VOLTAGE
Nominal voltage @ Sensitivity =
0 dB: 0.3 V
-10 dB: 1V
-20 dB: 3 V
Headroom at nominal input voltage
Balanced: 18 dB
Unbalanced @ Sensitivity =
0 dB: 18 dB
-10 dB: 15 dB
-20 dB: 12 dB
Common Mode Rejection (1 kHz): > 55 dB
Maximum DC Voltage: ±25 V
INPUT IMPEDANCE
1kHz:
- Balanced: 20 kΩ ±1%
- Unbalanced: 10 kΩ ±1%
DC:
- Balanced: 220 kΩ ±1%
- Unbalanced (to chassis GND): 120 kΩ ±1%
OUTPUT VOLTAGE
Line Output Peak Voltage: 9 V
Power Output Peak Voltage: 30 V
Power Output DC Voltage: 0 V
OUTPUT IMPEDANCE (1kHz)
Line Output: 100 Ω
Line Output load: ≥0 Ω
Power Output: 18 mΩ
Power Output load: ≥ 3 Ω
FREQUENCY RESPONSE (20 Hz - 20 kHz)
Line Output: -1 dB
Power Output: -1 dB
See also figure 1 below
SNR (MAX POWER 1kHz)/(SILENCE 0...20 kHz)
Line Output: 105 dB
Power Output: 100 dB
THD+N (20 Hz - 20 kHz)
Line Output: 1 kHz: 0.01%
Power Output: 1 - 450 W, 4 Ω: 1%
SENSITIVITY, ATTENUATION AND GAIN
Sensitivity: -20, -10, 0 dB
Sensitivity Error (no error @ 0 dB): ±0.1 dB
Attenuation: -30, -24, -18, -12, -9, -6, -5, -4, -3, -2, -1, 0 dB
Attenuation Error (no error @ 0 dB): ±0.1 dB
Total Gain (Sensitivity = Attenuation = 0 dB):
- Any Input to Line Output: 16 ±0.2 dB
- Any Input to Power Output: 43 ±1 dB
LEVEL INDICATOR
Trigger levels re power output clip level
Red LED: +7 dB
Yellow LED: 0 dB (Power output clip indicator)
Green LED: -6 dB
Blue LED: -30 dB (Signal Present Indicator)
FAN
Switch On Heatsink Temperature: 55°C
LW at Min Speed: 25 dB re 1 pW
LW at Max Speed: 52 dB re 1 pW
NOISE GENERATOR
Noise Types: white, pink, equalised
Frequency Range: 50-5000 Hz 1/3 octave bands
Crest Factor: 12 dB
Period Time: 45 s
Third Octave Spectral Error: ±0.3 dB
Line Output Voltage (Sensitivity = Attenuation = 0 dB): 2.16 Vrms
Turn Off: Equivalent RT in 1/3 octaves: < 60 ms @ 50 Hz, < 2 ms @ 5 kHz
CONNECTORS
Balanced Input Socket: Neutrik® Combo XLR-type: 3-pin and 1/4" jack
Unbalanced Input Socket: BNC
Unbalanced Line Output Socket: BNC
Power (Speaker) Output Socket: Neutrik® 4-pole Speakon® type
Mains Power Inlet: IEC type
CONTROLS
Generator Button: Toggling between On an Off
Generator Slide Switch: 3-state, White/Pink/Eq noise
Sensitivity slide switch: 3-state, -20, -10, 0 dB
Attenuation Rotary Knob: 12 state, -30, -24, -18, -12, -9, -6, -5, -4, -3, -2, -1, 0 dB
Mains Power Rocker Switch: 2-pole
STATUS INDICATORS
Protect Indicator: Red LED, power output over-current, overheat, overload or long-term high frequency
Power On Indicator: Green LED
MAINS POWER
Voltage Selector (Rear Panel): 230/115 VAC
Mains Voltage Range:
- @ 230 VAC: 190 - 265 VAC
- @ 115 VAC: 90 - 130 VAC
Mains Frequency Range:
- @ 230 VAC: 45 - 55 Hz
- @ 115 VAC: 55 - 65 Hz
Fuse: Littlefuse T 5 AH 250V 215 series, 215005.MXP
Maximum Power Consumption: 650 W
MECHANICAL
Weight (including mains cord in lid):
- Type 2734-A: 5.0 kg
- Type 2734-B: 6.0 kg
Dimensions W x H x D: 330 x 130 x 310 mm (13 x 5.1 x 12")
TRANSMITTER AKG PT 470 (OPTIONAL)
Specifications from manufacturer's technical data
RF Carrier Frequency Range: 7 channels over 650 - 865 MHz
Modulation: FM
Audio Bandwidth: 35 to 20000 Hz
THD (typical at rated deviation/1 kHz): < 0.7%
S/N Ratio: 120 dB(A)
RF Output: 50 mW max. (ERP)
Battery Life:
1.5 V AA Dry Battery: 6 hours
1.2 V NiMH, 2100 mAh AA size Rechargeable Battery: 8hrs
- Size: 60 x 73.5 x 30 mm (2.4 x 2.9 x 1.2")
- Net weight: 90 g (3.2 oz.)
RECEIVER AKG SR 470 (OPTIONAL)
Specifications from manufacturer's technical data
RF Carrier Frequency Range: 7 channels over 650 - 865 MHz
Modulation: FM
Audio Bandwidth: 35 to 20000 Hz
THD at 1 kHz: < 0.3%
S/N Ratio: 120 dB(A)
Audio Outputs: Balanced XLK and unbalanced TS 1/4" jack, balanced level switcheable to -30 or 0 dBm
Dimensions: 200 x 44 x 190 mm (7.8 x 1.7 x 7.4")
Weight: 972 g (2.2 lbs)
Figure 1. 2734 Frequency response
Ordering
Worldwide sales and marketing are handled exclusively by Brüel & Kjær. To order the 2734 you must contact your local Brüel & Kjær representative.
If you have technical questions regarding the 2734, you may contact us directly.