POWER AMPLIFIER
fP 6400
KEY FEATURES:
2 ✕ 1300 watts @ 8 Ω
2 ✕ 2300 watts @ 4 Ω
2 ✕ 3200 watts @ 2 Ω
(Measured just below clip level,
with both channels driven)
◆ Compact design, 2U high
◆ Low weight, 10 kg (22 lbs)
◆ MLS™ Switch: Lab.gruppen’s
unique power matching for
different loads
NEW FEATURES:
◆ Multiple positions gain switch
◆ Intercooler
with front-to-rear airflow and
easily accessible dust filters
◆ Improved low-end power
bandwidth
◆ Link connector with XLR-type
connector
◆ Bridged mono outputs in one
Speakon
◆ Extruded front panel for
increased stability
®
cooling system
®
connector
The fP 6400 is a lightweight and space-saving power amplifier, ideal for use
in high quality touring sound systems as well as in demanding permanent
installations.
Heat and cooling are fundamental problems in extreme high power amplifiers such as
the fP 6400. Already in 1990, Lab.gruppen patented a high efficiency amplifier, in fact an
evolution of the Class D amplifier. Lab.gruppen therefore call it Class TD. It attains the
same high efficiency as Class D, but avoids its drawbacks. Class D has a power-amplifier
topology using Pulse Width Modulation (PWM) to achieve high efficiency, but it needs a
recovery filter between the output stage and the loudspeaker. Lab.gruppen’s Class TD
amplifiers do not need this filter and this is one reason why the Lab.gruppen Class TD
obtains the same sonic quality as a traditional Class AB amplifier.
Besides the traditionally superb Lab.gruppen sonic performance, fP 6400 offers a full
line of important features:
Regulated switch mode power supply
Today there are many lightweight, switch-mode amplifiers in the market. However, the
unique Lab.gruppen switch-mode power supply technology offers a number of essential
advantages that make it superior to other and seemingly similar power supply designs.
The most important features are the regulated power supply and the extreme power
efficiency. The regulated power supply easily deals with a very high variation in the AC
mains voltage: it can drop by up to 20% below its nominal level – e.g. to 180 V (90 V)
instead of 230 V (115 V) – without any problem. Perhaps even greater benefits result
from the extreme efficiency of Lab.gruppen amplifiers: only a fraction of the energy from
the AC mains is turned into heat. A regulated power supply also presents some other
sonic advantages, such as better cone control and the same fast response as a conventional
power supply.
Multiple positions Gain switch
To meet the demands for a flexible gain structure in the system, Lab.gruppen offers a
multiple position gain DIP switch. The maximum amplifier gain can be set to all industry
standards: 20, 23, 26, 29, 32, 35, 38 and 41 dB.
Sophisticated protection circuitry, combining:
– DC protection; protects against infrasonic signals
– VHF protection; protects the loudspeakers against strong very high frequency non-
musical signals above the audible range.
– Thermal protection; prevents the amplifier from being overheated. The protection
indicators on the front panel are switched on, as a warning, before the protection
process is initiated.
– AC protection; shuts down the power supply if the line voltage is outside the
operating voltage.
– Clip limiter; prevents severely clipped waveforms from reaching the loudspeakers,
whilst maintaining full peak power.
SPECIFICATIONS
fP 6400
Max output power
1)
EIA EIA EIA EIA FTC
EIA at 1 kHz and 1% THD 20–20 kHz at 0.1% THD
MLS-switch –5 dB –4 dB –2 dB 0 dB Full 0 dB Full
16 Ω per channel 220 W 260 W 410 W 650 W 640 W
8 Ω per channel 430 W 520 W 820 W 1300 W 1280 W
4 Ω per channel 830 W 1000 W 1600 W 2300 W 2200W
2 Ω per channel 1660 W 2000 W 2400, 3050
3)
W 29002), 3200
3)
W 2500 W
16 Ω bridged 860 W 1040 W 1640 W 2600 W 2500 W
8 Ω bridged 1660 W 2000 W 3200 W 4600 W 4400 W
4 Ω bridged 3400 W 4000 W 4800, 6100
3)
W 58002), 6400
3)
W 5000 W
Max output voltage
8 ohms load 62 Vrms 70 Vrms 85 Vrms 104 Vrms
Peak voltage, no load 88 V 101 V 121 V 149 V
Distortion etc.
THD 20Hz-20kHz and 1W to full power 0.1 %
THD @ 1kHZ and –1dB under clip 0.04 %
DIM 30 at –3dB under clip 0.06 %
Power 230 V version 115 V version
Operation voltage 130 V–265 V AC 65 V–135 V AC
Minimum start voltage 175 V 85 V AC
Full output power
at 4ohms 180 V–265 V AC 90 V–130 V AC
Hum and Noise <–110 dB
Peak inrush current
(Soft start limited) 5 A 5 A
Channel separation @10kHz 70 dB
Current Draw @ 4ohms
Output impedance 60 mΩ
Quiescent power (no load) 1 Arms 2 Arms
1/8 of full power (–9 dB) 6 Arms 12 Arms
Slew Rate 20 V/s
1/3 of full power (–5 dB) 14 Arms 28 Arms
At full power (0 dB) 20 Arms 40 Arms
Inputs
@1 kHz 1% THD (AFS limited) (AFS limited)
Gain, selectable [dB] 20, 23, 26, 29, 32, 35, 38, 41
Impedance 20 kohm
Common mode rejection 50 dB
Net Dimensions
mm 483 (19˝) W ✕ 88 H ✕ 347 D
inch 19˝ W ✕ 3.5˝ H ✕ 13.7˝D
Front Panel
Gain controls (2) channel A, B 31 pos detent
Clip Indicator (2) red LEDs
Output headroom
Shipping Dimensions
mm 560 W ✕ 180 H ✕ 500 D
inch 22˝ W ✕ 7.1˝ H ✕ 19.7˝D
indicators (10) green LEDs Fast peak – slow release
Temp Indicator (2) yellow LEDs 80°C at heatsink
VHF indicator (2) yellow LEDs >12 kHz at full power
On Indicator (2) green LEDs DC rail voltage for
Weight
Net 10 kg (22 lbs)
Shipping 11.6 kg (25.6 lbs)
channel A and B
AC Indicator (1) green LED AC power present
AFS Indicator (1) green LED Fuse saver activated
Rear Panel
Input connectors (2) Neutrik Combo XLR type, 3 pin
and 1/4˝ jack
Link connector (2) XLR type, 3 pin male
Output connectors (2) Neutrik 4-pole Speakon® connectors
Switches:
Clip limiter A and B On–Off (switchable)
MLS switch 0, –2, –4, –5 dB
Link-switch Ch. A–B
Approvals
CE:
Emission EN 55 103-1, E3
Immunity EN 55 103-2, E3, with S/N below 1% at normal operation level
Safety EN 60065, class I
ETL listed: Conforms to ANSI/UL STD 6500 and Certified to CAN/CSA E60065-00
FCC: Complies with Class B digital device, Part 15 of the FCC Rules.
NOTES:
1) Specifications measured with 230 V AC
2) Component tolerance dependent
3) Continuous power, one channel driven or peak power both channels driven
(Thermal protection may occur at high continuous power)
4) Normal operation level 1/8 of full power or –9 dB below clip level.
Lab.gruppen reserve the right to alter functions or the specification without prior
notice.
4)
Lab.gruppen AB, Gullregnsvägen 16, SE-434 44 Kungsbacka, Sweden.
Tel +46 300 56 28 00 Fax +46 300 56 28 99 e-mail: info@labgruppen.com www.labgruppen.com
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