Lab Gruppen FP2400Q 4-Channel Power Amplifier

The fP 2400Q is a lightweight and space-saving power amplifier, ideal for use in high quality touring sound systems as well as in demanding permanent installations.

The fP 2400Q offers a choice of applications, such as in multi-channel monitor systems, four-channel reproduction and compact amplification in active 2-, 3-, and 4-way systems. The fP 2400Q gives the possibility to bridge connect one or two of the two pairs of channels (channel A and B and/or channel C and D).

It also features Lab.gruppen’s unique power matching solution, the MLS switch, which offers endless combinations for solving most of the problems related to different impedances and maximum power capacities of loudspeakers.

The latest semiconductor technology is utilized in the new ferrite Power (fP) amplifiers. This, together with Lab.gruppen’s proprietary copper cooling system, Intercooler®, enhances the 2 ohms capability. Two easily accessible dust filters on the front ensure a clean front-torear airflow.

A new Bi-phase wiring scheme also increases the capacity of the switch mode power suppply. This extends the power bandwidth in the low end.

Besides the traditionally superb Lab.gruppen sonic performance, there is a full line of features to make the fP family functional in all situations from installation to high performance live sound systems:

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.

Sophisticated protection circuitry, combining:

• ALS™ short circuit protection; the Adaptive Limiting System permits very high peak currents, but keeps the amplifier within the Safe Operation Area.
• 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.

Max output power

• 8 Ω per channel: 380 W
• 4 Ω per channel: 590 W 3), (700w 2), 3))
• 2 Ω per channel: 500 W 4), (650w 2), 3), 4))
• 8 Ω bridged: 760 W 4), 5)
• 4 Ω bridged: 1020 W 4), 5), (1280 W 2), 3), 4), 5))

Max output voltage

• 8 ohms load: 54 Vrms
• Peak voltage, no load: 81 V

Distortion, etc.

• THD 20 Hz - 20 kHz and 1 W to full power: 0.07 %
• THD at 1 kHz and 1 dB below clipping: 0.02 %
• DIM 30 at 3 dB below clipping: 0.008 %
• Hum and noise: < -107 dB
• Channel separation at 10 kHz: 70 dB
• Output impedance: 30 mΩ
• Slew rate: 60 V/µsec

Inputs

• Gain selectable [dB] 5: 32
• Impedance: 20 kΩ
• Common mode rejection: 50 dB

Front panel

• Gain controls: 31 pos detent
• Indicators per channel | Clip: Red LED 2
• Output headroom indicators: 2 green LED’s
• Protect (Short, temp & VHF): Yellow LED
• VHF: N/A
• Over temperature: N/A

Rear panel

• Input connectors: Neutrik Combo
• Link connectors: N/A
• Clip limiters: On/Off, each ch.
• MLS switch [dB]: 0, -3
• MLS switch [dB] - corresponding to [Vrms]: 55, 41
• MLS switch [dB] - when bridged [Vrms]: 110, 82
• Link switch: Ch. A-B, B-C, C-D

Power

• Operation voltage, 230V/115V: 130-265V/65-135V
• Soft Start: Yes
• Peak inrush current: 5 A
• Full output power at 4 ohms, 230V/115V: 180-265V/90-130V
• Minimum start-up voltage, 230V/115V: 175V/95V
• 230 V or 115 V versions: Yes

Current draw at 4Ω and 230V/115V

• Idle, no load at output: 1.4/2.8 Arms
• 1/8 of full power (-9 dB): 6/12 Arms
• 1/3 of full power (-5 dB): 9/18 Arms
• At full power (0 dB) at 1 kHz 1 % THD: 16/32 Arms

Dimensions / Weight

• Width: 483 mm (19”)
• Height: 88 mm(3.5”)
• Depth: 316 mm (12.4”)
• Weight: 8.6 kg (19 lbs)