Lab Gruppen FP3400 Quick Start Guide

POWER AMPLIFIER

fP 3400

KEY FEATURES:

2 ✕ 1100 watts @ 8 Ω
2 ✕ 1500 watts @ 4 Ω
2 ✕ 1700 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 3400 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 extremely high powered amplifiers such as
the fP 3400. 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, fP3400 offers a full

line of important features:

Regulated switch mode power supply

Today there are many lightweight, switch-mode amplifiers on the market. However, the
unique Lab.gruppen switch-mode power supply technology offers a number of essential
advantages that make it superior to other 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 3400

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 160 W 200 W 340 W 520 W 500 W
8 Ω per channel 300 W 400 W 700 W 1100 W 1000 W
4 Ω per channel 600 W 750 W 1300 W 1500, 1900
2 Ω per channel 1200 W 1400 W 1550, 1900

3)

W 17002), 3000

3)

W 1450 W

3)

W 1650 W

16 Ω bridged 600 W 800 W 1400 W 2200 W 2000 W
8 Ω bridged 1200 W 1500 W 2600 W 3000, 3800
4 Ω bridged 2400 W 2800 W 3100, 3800

3)

W 34002), 6000

3)

W 2900 W

3)

W 3300 W

Max output voltage

8 ohms load, MLS @ 0 dB 52 Vrms 58 Vrms 75 Vrms 94 Vrms
Peak voltage, no load 79 V 82 V 107 V 132 V

Distortion etc.

THD 20 Hz-20 kHz and 1 W to full power 0.08 %
THD @ 1 kHZ and –1 dB under clip 0.03 %
DIM 30 at –3 dB 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 4 ohms 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 @10 kHz 70 dB

Current Draw @ 4ohms

Output impedance 60 mΩ

Quiescent power (no load) 1 Arms 2 Arms
1/8 of full power (–9 dB) 5 Arms 10 Arms

Slew Rate 20 V/␮s

1/3 of full power (–5 dB) 11 Arms 22 Arms
At full power (0 dB)

Inputs

@1 kHz 1% THD 26 Arms 52 Arms
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 [phone] Fax [phone] e-mail: [e-mail] www.labgruppen.com