LD Systems IPA424T 4-Channel Hybrid DSP Amplifier 4x 240W (EX-REPAIR)

B-Stock Condition Report

Condition: Ex-Repair Original Box: Yes
Comments: Refurbished, minor scuff marks Accessories: No power cable, comes with manual

Introducing the LD Systems IPA424T 4-Channel Hybrid DSP Amplifier 4x 240W professional amplifier. LD systems have included Four Channels to operate at 4x 240 Watts. All the outputs on the IPA424T are high-quality toroidal core transformers and operate at 70V/100V.

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LD Systems IPA424T 4-Channel Hybrid DSP Amplifier 4x 240W

Introducing the LD Systems IPA424T 4-Channel Hybrid DSP Amplifier 4x 240W professional amplifier. LD systems have included Four Channels to operate at 4x 240 Watts. All the outputs on the IPA424T are high-quality toroidal core transformers and operate at 70V/100V.

These transformers are perfect for use with the LD Systems DQOR 3T, DQOR 5T, DQOR 8T speakers. While the low impedance 4-Ohm outputs with the transformer-less operation will guarantee you the highest possible audio quality. 

The IPA424T comes packed with versatile functions; including a parametric EQ with a matching speaker library, dynamic tools, a matrix mixer, priority source selection, and delay. Despite this range of functions, the IPA Series power amps are easy to operate. Important functions such as signal, limit, protection, and bridge mode are easily visible via the LEDs on the front panel.

Future-proofing connections

On the back of your IPA424T, you will find a few future-proofing connections. For example, the Ethernet card offers comprehensive configurations and management via software. As the Dante card offers audio networking capabilities to a wide range of Dante-enabled devices. As a result, you can integrate the IPA424T into the Dante network in order to resolve more complex tasks.

Scalability and future-proofing are the biggest advantages of the IPA Series. Its energy efficiency is also ideal thanks to the Class-D technology and switchable auto standby.

Useful installations

In conclusion, good sound belongs everywhere. In the hotel lobby, in conference rooms, in schools, and in houses of worship. Demands are constantly increasing, not only in terms of quality but also in terms of flexibility. Permanently installed and still flexible? This apparent contradiction can be resolved by the IPA Series DSP-based installation amplifiers.

The IPA412T variant with 4 x 120 watts is available for smaller installations.



  • Professional 4-channel installation amplifier
  • Powerful class D power amplifier with 4 x 240 W (IPA 424 T) or 4 x 120 W (IPA 412 T) at 4 Ohm (transformer bypass) or 70V/100V outputs through toroidal core transformer
  • Stereo/parallel/bridge mode selector switch per channel pair
  • 4 balanced line inputs and 4 speaker outputs with terminal block connections
  • User-friendly front panel with signal, limit, protection, mute and bridge mode LEDs per channel and clipping LEDs for the inputs
  • Speaker protection circuits: DSP limiter, overcurrent, direct current, overheating, short circuit as well as switchable auto standby mode
  • DSP presets with HPF and LPF which can be activated via DIP switches
  • REMOTE audio and control bus based on CAN architecture (Controller Area Network)
  • Equipped for future LD Systems remote control panels and paging microphones
  • Slot for future optional expansion cards for Ethernet or Ethernet + Dante

Width: 483 mm

Height: 44.5 mm

Depth: 425 mm

Weight: 11,36 kg


Product type: Amplifier

Type: Installation power amplifier

General data

Audio Channels: 4

Output Circuitry: Class D

Operating voltage: Wide Range SMPS with PFC (power factor control)

Mains connector: IEC socket

Auto-Standby Power: Yes. Switchable (On-Off)

Time to Auto-standby: 20 Min with no audio input signal

DSP: Yes

Remote-Bus: Yes

Indicators: Front Panel: “PROT”, “LIMIT”, “SIG”, “BRIDGE” and Mute Symbol LED´s. Power On/ Standby LED, Rear Panel: 4x Input Clip LED´s, Remote Lock LED (Red)

Controls Front panel: On/off switch, standby

Controls Element Back Panel: “BRG“ (Bridge), “PAR“ (Parallel), “ST“ (Stereo), Amplifier Channel Mode, Low-Z and High-Z switches (paired), Output Volume potentiometers, Preset A and B switches, Remote Lock, Remote ON/OFF, Remote-Mode, Standby On/Off

Inputs: 4x Balanced Line Inputs, Remote Bus Audio Input

Input connectors: 6-pin Terminal Block Pitch 3.81mm, Remote IN/OUT RJ45, Service connection Micro USB type B

Expansion Slot: For optional Ethernet, or Ethernet + Dante cards

Cooling: front to rear/side airflow, Passive + 2-zone temperature-controlled active cooling

Operating voltage: 100 V AC – 240 V AC, 50 – 60 Hz

Fuse: T10AL 250 V

Inrush Current Power OFF-Standby: 2.8 A

Inrush Current Standby-ON: 0.5 A

Power Consumption @ Standby: 0.9 W

Power Consumption @ idle mode: 30 W

Power Consumption @ full load: 1000 W

Operating temperature: 0 °C – 40 °C; (max 60% relative humidity)


Amplifier Output Specifications, all outputs are driven and loaded

Rated ouput power (1kHz @ 4 Ohms): 4 x 240 W (1.5 seconds sine burst)

Rated ouput power (1kHz @ 8 Ohms): 4 x 120 W (1,5 Seconds Sine Burst)

Rated ouput power (1kHz @ 16 Ohms): 4 x 60 W (1.5 Seconds Sine Burst)

Rated ouput power (1kHz @ 8 Ohms, bridged): 2 x 490W (1.5 Seconds Sine Burst)

Protection circuits: Audio Limiter, DC, HF Protect, HPF (High-Z), short circuit, temperature, thermal overload

Minimum load impedance per channel: 4 ohms Single-Ended, 8 ohms Bridge


Performance specifications

Nominal input sensitivity: +5 dBu (Sine 1 kHz, Gain max)

THD + N: < 0,03 % (Low-Z SPK OUT, +18 dBu, 20 Hz – 20 kHz)

Frequency response: 18 Hz – 22 kHz (Low-Z OUT, -3 dB), 50 Hz – 23 kHz (High-Z OUT, -3 dB)


Digital Specifications

System Latency: 6.2 ms

AD/DA converter resolution: 24 bit

AD/DA converter sampling rate: 48 kHz

For more information, please visit the manufacturer's website.