Lab.gruppen LAB 1000 User Manual

needs the chassis ground for reference, otherwise a
current loop is formed via the signal ground.
Use the balanced input to avoid hum and
interference.
5. Power consumption
There are three ways to determine the
power/current consumption of the amplifier:
First, the peak current draw at full output
power. Under this condition the power will trip the
wall breaker within 30 second and the amplifier
will operate for less than 2 minutes before
thermally limiting. During this time, the
temperature of the power supply will be stabilised
at a temperature that will have no effect on the
insulation rating of the AC line cord.
Secondly, the maximum expected average
current under worst case program material which is
1/3 of full power according to the FTC-standard. At
this level the music will be in the state of constant
clip and is therefore the highest power level one
can obtain without completely obliterating the
program.
At last, the "normal operating power", as
measured according to the safety standard IEC 65
and used by a majority of safety agencies. The
normal operating power is measured using pink
noise, with an average output power equal to 1/8 of
full power. The one eighth of the total power is as
loud as you can play music while making some
attempt to avoid obvious clipping. It also
corresponds to a headroom of 9dB, which is very
low for an audio program.
In 2 ohms operation, the protection of the amplifier
circuit will not permit long term current draw and
the component temperature rise will stabilises well
below the rating.
Table 1.
MAX OUTPUT POWER MAINS INPUT POWER
Power Full Power 1/3 Power 1/8 Power Idle
sine wave note 1 note 2
LAB 1000
8 ohms 2X 380 1500 1000 500 270
4 ohms 2X 600 2400 1600 800 270
2 ohms 2X 700 3500 1800 900 270
note 1
Mean power with music as program source Normal" music power with 9dB headroom,
The amplifier driven to clip level
note 2
IEC standard power rating.
The current draw can be calculated by dividing the mains input power by the mains voltage.
We recommend you to design the power distribution for at least the current at 1/8 power and 1/3 power for
heavy duty demands like discos etc.
The heat power can be calculated as the following example:
We consider a headroom of at least 9dB and a 4 ohms load on an amplifier producing 600 watts per channel.
The 1/8 power per channel is then; 600 / 8 = 75 watts, total output; 2 x 75 = 150 watts.
The power consumption according to the chart above is then 800 watts.
The heat power produced is the difference between the power consumption and output power;
800 - 150 = 650 watts per amplifier.
6. Input connections
XLR Input connectors are balanced and wired
according to the IEC 268, that is pin 2 hot, and wired
in the following way:
PIN 1 GROUND/SHIELD
PIN 2 HOT
PIN 3 COLD
Figure 3. XLR input connector pinout
There are also TRS jacks for linking etc. They are
wired as follows:
TIP HOT
RING COLD
SLEEVE SHIELD/GROUND
Figure 4. TRS phone plug
The input impedance is high enough (20 kohms
balanced) to allow ”daisy-chaining”, or multiple
parallel input connections. To daisy chain, use the
TRS jacks provided on each channel. The input
circuits also have a high enough headroom, to accept
the maximum output level from virtually any low
level signal source.
5

Lab.gruppen LAB 1000 Specifications

Power Output

max output power at 8 Ω stereo	350 W
max output power at 4 Ω stereo	550 W
max output power at 2 Ω stereo	600 W
max output power at 8 Ω bridged	1200 W
max output power at 4 Ω bridged	1300 W

Power Output (EIA)

max output power at 8 Ω stereo (EIA)	380 W
max output power at 4 Ω stereo (EIA)	600 W
max output power at 2 Ω stereo (EIA)	700 W
max output power at 8 Ω bridged (EIA)	1300 W
max output power at 4 Ω bridged (EIA)	1400 W

Calculated Peak Power

peak power at 8 Ω stereo	500 W
peak power at 4 Ω stereo	900 W
peak power at 2 Ω stereo	1300 W
peak power at 8 Ω bridged	1800 W
peak power at 4 Ω bridged	2600 W

IHF Peak Power

ihf peak power at 8 Ω stereo	450 W
ihf peak power at 4 Ω stereo	750 W
ihf peak power at 2 Ω stereo	900 W
ihf peak power at 8 Ω bridged	1500 W
ihf peak power at 4 Ω bridged	1800 W

Distortion

thd 20 Hz-20 kHz and 1 W-600 W at 4 Ω	0.08 %
thd at 1kHz and 600W at 4 Ω	0.03 %
dim 30 at 300 W at 4 Ω	0.02 %
ccif (13 and 14 kHz) at 200 W at 4 Ω	0.02 %
smpte (60 Hz and 7 kHz) at 300 W at 4 Ω	0.05 %

Power and Operating Conditions

power bandwidth	10 Hz-50 kHz
slew rate	40 V/µs
output impedance at 1 kHz	0.07 ohm
hum and noise below max power	<- 105 dBA
channel separation at 1 kHz	90 dB
channel separation at 10 kHz	75 dB

Phase and Delay

deviation from perfect delay 150 Hz-20 kHz	± 2°
total delay input to output at 4 ohms	4.1 µs
sensitivity for full output into 4 ohms	0.775 or 1.7 Vrms
gain switchable	36 dB or 29 dB
impedance	20 kohms, balanced

Power Requirements

operation voltage	120 V - 260 V AC
full output power	230 V AC
peak inrush current	83A

Dimensions and Weight

width	483 mm (19”)
height	88 mm (3.5”)
depth	355 mm (14”)
weight	18 kg (40 lbs)