FRP-2.4K4/BL DS18 2400W RMS 4-Channel Full-Range Class-D Amplifier| 4x250W @ 4 Ohm
Massive 4-Channel Power in a Compact Class-D Amplifier
The DS18 FRP-2.4K4/BL is a high-output 4-channel Class-D amplifier designed for systems that need serious full-range power without taking up excessive installation space.
With up to 2400 watts RMS of total rated output, this amplifier gives you the flexibility to power high-output mids and highs, full-range speakers, or subwoofer configurations depending on how your system is designed.
The FRP-2.4K4 delivers:
4 × 250W RMS @ 4 Ohms
4 × 400W RMS @ 2 Ohms
4 × 600W RMS @ 1 Ohm
It can also be bridged for:
2 × 750W RMS @ 4 Ohms
2 × 1000W RMS @ 2 Ohms
That combination of power and configuration flexibility makes the FRP-2.4K4 particularly useful for high-output automotive, motorcycle, Jeep, and stunt wall systems.
What Makes the FRP-2.4K4 Different?
Many high-power amplifiers require a substantial amount of installation space. The FRP-2.4K4 takes a different approach by combining high-output Class-D amplification with a relatively compact chassis.
At approximately:
10.3" Long × 5.5" Wide × 2.4" Tall
the amplifier can provide substantial system power while remaining practical for installations where space is limited.
The amplifier is also designed for flexible system configuration, allowing each channel to operate down to 1 ohm or channels to be bridged down to 2 ohms.
2400W RMS of Full-Range Amplification
The FRP-2.4K4 is rated for up to 2400W RMS total output, with several power configurations available depending on speaker impedance.
RMS Power Output
4 Ohms:
4 × 250W RMS
2 Ohms:
4 × 400W RMS
1 Ohm:
4 × 600W RMS
Bridged Output
4 Ohms Bridged:
2 × 750W RMS
2 Ohms Bridged:
2 × 1000W RMS
This makes the FRP-2.4K4 suitable for everything from moderate 4-ohm speaker systems to much more demanding low-impedance high-output builds.
Built for Full-Range Systems
The FRP-2.4K4 isn't limited to one type of speaker system.
Its selectable HPF, LPF, and Full-Range crossover modes allow the amplifier to be configured for different applications.
Use the amplifier to power:
- Midrange speakers
- Coaxial speakers
- Component speakers
- High-output loudspeakers
- Motorcycle speakers
- Jeep and off-road speakers
- Powersports speakers
- Subwoofers
- Bridged speaker configurations
The crossover range extends from 10Hz to 2kHz, providing flexibility for properly configuring the amplifier to the speakers it is powering.
Designed for High-Output Audio Builds
The FRP-2.4K4 is especially well suited to systems where output matters.
High-output speakers often require substantially more amplifier power than a conventional factory replacement system. With up to 600W RMS available per channel at 1 ohm, the FRP-2.4K4 provides the power capacity needed for demanding custom systems.
This makes it particularly attractive for:
- High-output car audio
- Custom speaker pods
- Multi-speaker systems
- Mids and highs systems
- Systems requiring multiple amplifier channels
Class-D Efficiency in a Compact Chassis
The FRP-2.4K4 uses a digital Class-D amplifier design to provide high output while maintaining a compact footprint.
The amplifier features a smart cooling fan that helps manage heat during demanding operation.
At 4 ohms, the amplifier is rated at 97% efficiency, helping make the most of the available electrical power.
For high-output installations, proper electrical-system planning is still essential. Amplifier output at this level can place substantial demand on the vehicle's charging and electrical system.
Flexible Crossover Control
The FRP-2.4K4 includes selectable:
HPF — High-Pass Filter
LPF — Low-Pass Filter
FULL — Full Range
The crossover adjustment range is:
10Hz–2kHz
This allows the amplifier to be configured according to the speakers and role of each channel.
For example, high-output midrange speakers can be protected from excessive low-frequency demand using an appropriate HPF, while subwoofer applications can use LPF filtering.
Adjustable Bass Boost
The amplifier includes adjustable bass boost from:
0–12dB @ 50Hz
This provides additional control over the low-frequency response when the system design calls for it.
Bass boost should be used carefully and with consideration for the speakers being powered. Adding significant boost increases the demand placed on the amplifier and speakers.
Smart Cooling & Protection
The FRP-2.4K4 is equipped with a smart cooling fan and multiple protection systems designed to help protect the amplifier during demanding operation.
Built-in protection includes:
- Thermal protection
- Overload protection
- DC output protection
- Short-circuit output protection
- Voltage input protection
The amplifier also provides dedicated Power, Protect, and Clipping LED indicators to help monitor amplifier operation.
0-Gauge Power Input
With its high-current output capabilities, the FRP-2.4K4 uses a 0-gauge power input terminal.
DS18 recommends a 240A fuse rating for the amplifier.
Proper power and ground wiring are critical when installing a high-output amplifier. Wire size, fuse selection, grounding, battery capacity, and charging-system capability should all be considered as part of the complete installation.
Tiffany-Style RCA Connections
The FRP-2.4K4 features Tiffany-style RCA terminals designed to provide secure signal connections in demanding installations.
The low-level input range is:
400mV–6V
The amplifier also includes a 2CH/4CH input selector, providing additional flexibility when integrating the amplifier into different system configurations.
Key Features
- 4-channel full-range Class-D amplifier
- Up to 2400W RMS total output
- 4 × 250W RMS @ 4 ohms
- 4 × 400W RMS @ 2 ohms
- 4 × 600W RMS @ 1 ohm
- 2 × 750W RMS @ 4 ohms bridged
- 2 × 1000W RMS @ 2 ohms bridged
- Selectable HPF / LPF / Full crossover
- 10Hz–2kHz crossover adjustment range
- 0–12dB bass boost @ 50Hz
- 97% efficiency @ 4 ohms
- Smart cooling fan
- Power, Protect and Clip LED indicators
- 0-gauge power input
- Recommended 240A fuse
- Tiffany-style RCA terminals
- 2CH/4CH input selector
- Thermal protection
- Overload protection
- DC output protection
- Short-circuit protection
- Voltage input protection
- Compact chassis design
Technical Specifications
Amplifier
Brand: DS18
Model: FRP-2.4K4/BL
SKU: FRP-2.4K4/BL
Amplifier Class: Class-D
Amplifier Type: Full-Range Multi-Channel
Channels: 4
Total RMS Power: 2400W RMS
RMS Power
4 Ohms: 4 × 250W RMS
2 Ohms: 4 × 400W RMS
1 Ohm: 4 × 600W RMS
Bridged Power
4 Ohms: 2 × 750W RMS
2 Ohms: 2 × 1000W RMS
Audio Performance
Frequency Response: 10Hz–20kHz
Signal-to-Noise Ratio: 90dB
Efficiency @ 4 Ohms: 97%
Damping Factor: 90
Channel Separation: 50dB
THD: 0.5%
Input Impedance: 10kΩ
Low-Level Input Range: 400mV–6V
Crossover
Crossover Type: HPF / LPF / Full
Crossover Range: 10Hz–2kHz
Bass Boost: 0–12dB
Bass Boost Frequency: 50Hz
Installation & Construction
Minimum Impedance: 1 Ohm Stereo / 2 Ohms Bridged
Power Input: 0 Gauge
Recommended Fuse: 240A
Cooling: Smart Cooling Fan
Input Selector: 2CH / 4CH
RCA Connections: Tiffany-Style
Body Finish: Blue
Dimensions
Length: 10.3" / 262mm
Width: 5.5" / 140mm
Height: 2.4" / 63.5mm
Heatsink Length: 9" / 230mm
Weight: Approximately 5 lbs / 2.3 kg
Installation & Fitment Considerations
The FRP-2.4K4 measures approximately 10.3" × 5.5" × 2.4", making it compact for its power class, but the installation still requires adequate space for wiring, ventilation, and service access.
Before installation, verify:
- Available mounting space
- Clearance around the amplifier
- Adequate ventilation
- Power and ground wire routing
- Fuse placement
- Speaker impedance
- Speaker power handling
- RCA cable routing
- Grounding location
- Charging-system capacity
Because this amplifier can operate at 1 ohm per channel, impedance must be carefully calculated before connecting multiple speakers to an individual channel.
When bridging channels, the minimum load is 2 ohms bridged.
Do not connect speakers below the amplifier's rated minimum impedance.
Expert Recommendation
The DS18 FRP-2.4K4/BL makes the most sense for customers who want serious four-channel power without installing a physically large amplifier.
Its biggest advantage is flexibility.
You can run four 4-ohm speakers at 250W RMS each, move to 2-ohm loads for 400W RMS per channel, or use 1-ohm configurations for up to 600W RMS per channel. The ability to bridge channels adds another option for systems that need significantly more power from fewer channels.
For a typical four-speaker system, the 4 × 250W @ 4Ω configuration is an easy starting point.
For a custom high-output powersports, Jeep, motorcycle, or marine system, the amplifier's lower-impedance capabilities provide much more room to build around higher-powered speakers.
The key is to match the amplifier to the speakers and final impedance rather than simply chasing the largest wattage number.
Frequently Asked Questions
How much power does the DS18 FRP-2.4K4 produce?
The FRP-2.4K4 produces:
4 × 250W RMS @ 4Ω
4 × 400W RMS @ 2Ω
4 × 600W RMS @ 1Ω
It can also produce:
2 × 750W RMS @ 4Ω bridged
2 × 1000W RMS @ 2Ω bridged
Is the FRP-2.4K4 a 4-channel amplifier?
Yes. It is a 4-channel full-range Class-D amplifier.
Is the FRP-2.4K4 1-ohm stable?
Yes. Each stereo channel can operate down to 1 ohm.
Can I bridge the FRP-2.4K4?
Yes. The amplifier can be bridged down to a minimum 2-ohm load.
How much power does it produce bridged?
It produces:
750W RMS × 2 @ 4Ω bridged
or
1000W RMS × 2 @ 2Ω bridged
Can this amplifier run mids and highs?
Yes. Its full-range design and selectable HPF, LPF, and Full crossover modes make it suitable for powering mids, highs, coaxial speakers, and other full-range speakers.
Can I use the FRP-2.4K4 for subwoofers?
Yes. The amplifier can be configured for subwoofer applications using its LPF crossover. Its bridged output can also provide substantial power for suitable subwoofer loads.
Does the FRP-2.4K4 have a built-in crossover?
Yes. It has selectable HPF, LPF, and Full Range modes with an adjustable crossover range from 10Hz to 2kHz.
Does the amplifier have bass boost?
Yes. The bass boost is adjustable from 0–12dB at 50Hz.
What size power wire does this amplifier use?
The amplifier uses a 0-gauge power input terminal.
What size fuse does DS18 recommend?
The recommended fuse rating is 240A.
Does the FRP-2.4K4 have a cooling fan?
Yes. It uses a smart cooling fan.
Is the FRP-2.4K4 waterproof?
No. The amplifier should not be considered waterproof or submersible.
Can I use this amplifier in a Jeep?
Yes. It can be used in custom Jeep audio systems, particularly high-output builds where substantial amplifier power is needed.
What are the dimensions?
The amplifier measures approximately:
10.3" L × 5.5" W × 2.4" H
The heatsink itself is approximately 9" long.
Does the amplifier have protection circuits?
Yes. It includes thermal, overload, DC output, short-circuit output, and voltage input protection.