fP amplifiers are extreme in every aspect,
and loaded with Lab.gruppen's leading technology, proven
since many years: The super-efficient switch mode power supply -
Lab.gruppen's proprietary design - reduces the weight without
any effect on the audio signal, resulting in brilliant sound
quality from the extreme lows to the very highs even under
extreme, very difficult, conditions.
"The coolest power amps you can find", thanks to the
Intercooler, a unique cooling system, enabling both safe
long-term operation, even when driven to the limits, and improved
sound quality at high levels.
The MLS feature lets the user "convert" any amplifier,
as simple as it looks, into the perfect drive engine for the
individual load impedance, high or low, providing the best
possible control of the loudspeaker cones.
The flagship models, fP 6400 and fP 3400, incorporate the quantum
leap in amp design: Class TD, Lab.gruppen's evolution of the
common class D. They offer the high efficiency of class D, whilst
avoiding all the usual drawbacks. Lab.gruppen simply sets a new
standard! A complete and reliable protection circuitry is a must,
and all Lab.gruppen amps include the ALS short circuit protection
in their protection system.
All in all, the fP models are the reliable high quality
companions both "on the road" and when permanently
installed. Simply the best trouble-free investment you can
make!
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 obtains 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,
fP6400 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 instead of 230 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 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.
