Every FP+ Series amplifier is designed,
engineered, assembled, and rigorously tested
at Lab.gruppen’s manufacturing facility in
Kungsbacka, Sweden. The uncompromising
dedication to quality and craftsmanship is
evident in every detail.
Dust-filters (accessible behind grille)
Mains power switch
Remote on/off enable
Per channel:
Very High Frequency (VHF)
High Temperature (TEM)
Power on
Mute
Power Average Limiter (PAL)
Current Peak Limiter (CPL)
Voltage Peak Limiter (VPL)
NomadLink
®
network active
-20 through -4 dB metering
Bridge indicator
Signal present / High impedance
Class TD output converter
Temperature-controlled, proportional speed cooling fans
Lightweight, high capacity ferrite transformer
Copper Intercooler
®
cooling system
Linear Class B audio power amplifier
Regulated Switch Mode Power Supply
What’s inside?
Regulated Switch Mode Power
Supply (R.SMPS™)
Lab.gruppen pioneered the use of
switch mode power supplies in power
amplifiers, and the latest generation
of this technology plays a key role in
enabling the extreme power density
of the FP+ Series. Precise regulation
maintains constant voltage on the
internal rails, ensuring full output power
and undistorted sound even when the
mains voltage drops as much as 20%
below nominal. The FP+ Series power
supply also incorporates an enhanced
ferrite power transformer core which,
compared to it’s iron core counterparts,
dramatically reduces weight and
contributes to overall efficiency.
Class TD output stage
Lab.gruppen’s FP+ Series amplifiers
share an output stage that is literally
in a class by itself: the patented
Class TD. A breakthrough design that
occupied Lab.gruppen’s co-founder
Kenneth Andersson for nearly two
Configurable for any signal, any load
Each FP+ Series amplifier offers an
eight-position input gain switch to
optimize performance with any input
signal. In addition, each channel
incorporates Lab.gruppen’s exclusive
Voltage Peak Limiter (VPL) circuit. VPL
precisely tailors output for any type
of load, from a single massive 2-ohm
subwoofer to a series of 16-ohm mid-
or high-frequency drivers. Working in
concert, adjustable input gain and VPL
optimize each channel for maximum
headroom regardless of input signal
dynamics or load impedances.
Intercooler
®
for efficient, uniform
cooling
Compact and ultra-efficient, Intercooler
®
uses thousands of tiny cooper
cooling fins to increase exposure of
the heat sink to the cooling air flow.
Twin variable-speed fans respond to
temperature sensors, forcing air over
the Intercooler
®
fins in a front-to-rear
flow. All output devices are mounted
transverse to the airflow, so the cooling
effect is uniform. There are no “end of
tunnel” output transistors subject to
greater warming and, consequently,
possible premature failure.
years, Class TD combines the high
efficiency of a digital Class D with the
sonic purity of classic Class B designs.
The power supply rails precisely track
the audio signal at all times, providing
the required voltage plus additional
headroom. This process is highly
efficient, with only a tiny portion of this
voltage emitted as heat in the output
stage. The audio path itself remains
entirely in the analog domain. It never
enters the switching portion of the
circuit, and is therefore not subject
to the ripple effects of the extreme
filtering required by the PWM Class
D approach. Class TD is bridgeable,
highly reliable, and maintains a flat
response with complex loads as low
as 2 ohms nominal. Also, it does not
interfere with RF equipment such as
wireless (radio) microphones.
A full suite of protection features
Lab.gruppen’s FP+ Series incorporates
comprehensive warning and protection
features to safeguard the amplifier
and all connected loudspeaker
drivers. Front-panel indicators and the
DeviceControl GUI give clear warnings
when any potential problems are
detected. Protection measures are
enabled only when critical thresholds
are passed: measurements are
re-checked every few seconds,
or at start-up. While in operation,
a Power Average Limiter (PAL)
constantly monitors the current-
drawing relationship between the
power supply and the mains inlet.
If conditions are detected where the
power amplifier could draw more
than the mains inlet can supply, PAL
limits current draw to prevent power
interruption. Additionally, a soft-start
circuit limits initial current draw when
amplifier is turned on.
and normal operation resumes
automatically when nominal conditions
are restored. The complete protection
/ warning suite includes: DC at output,
short circuit, excessive output current,
sustained very high frequency (VHF),
and open load.
The FP+ Series also includes features
to guard against inadvertent tripping
of the mains fuse or external circuit
breakers, either during a performance
Binding post or Speakon
output connectors (BP
only on FP 13000)
Balanced loop-through
signal output connector
(FP 13000, FP 7000 only)
Balanced input connectors
Mains Inlet (115 V / 230 V)
NomadLink
®
In and Out ports
Network indicator
DIP-switch matrix: Input gain, Fan masked,
Bridge mode, VPL voltage select, VPL mode
Breakthrough
technology
(FP 10000Q shown)
View all key performance
parameters at a glance - in real
time - on a comprehensive front-
panel display. The FP+ provides the
most complete and useful front-panel
indication on the market today. Bright,
color-coded LEDs give clear status
indication of all control activation,
warnings and faults - without scrolling
through menus. Conditions such
as blown drivers, shorted lines, and
over-temperature channels are easily
recognizable. You won’t waste time
trying to decipher a generic
“trouble light.”
Match each channel precisely to
its load. With the DIP-switch matrix,
you can assign a hard or soft attack to
the limiter functions, set overall gain
to one of seven different levels, bridge
any pair of channels, and set the VPL
for optimum output characteristics
with the connected load. All in a
matter of seconds while the amp is
in the rack.
Class TD technology
Class T D supply ra ils close ly track th e output
waveform for h igh effi ciency an d extremel y low
distortion.
Characteristics of different power
supply designs:
R.SMPS provides stable voltage down to 90 V (115
V nominal) or 180 V (230 V nominal).
Drops in mains voltage produce proportional drops
with typical toroidal power supplies.
Other typical supplies show severe rail voltage drops
due to semi-conductor losses, potentially causing
current limiting or shutdown.
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