Fusion amplifierS by Hypex

What is a Fusion amplifier?

A Fusion amplifier is a complete power amplifier mounted on a steel or aluminum plate, engineered to bolt directly onto the back of a loudspeaker cabinet. Like a standalone amplifier module, it takes the line-level signal from your preamplifier or source and turns it into the power that drives your drivers. The difference is that it skips the separate chassis: everything is integrated into one plate-shaped assembly that becomes part of the speaker itself. For an active speaker or subwoofer build, that's a significant simplification.

The Fusion concept is what makes high-end active speakers and subwoofers accessible to DIY builders. Instead of designing your own amplifier from scratch, sourcing a separate power supply, configuring an external DSP, and figuring out how to integrate it all into the back of a cabinet, you start with a single plate that already has everything on it. What's left is the satisfying speaker-building work: cabinet design, driver selection, and tuning the result with the built-in software.

All-in-one design: amp, DSP, and power supply

Every Fusion amplifier integrates three components that would otherwise need to be sourced, matched, and wired together separately:

• The Class D amplifier stage (one, two, or three channels depending on the model)
• A full digital signal processor with active crossovers, parametric EQ, time alignment, and configurable limiters
• A matching switch-mode power supply (SMPS), calibrated to the amplifier's voltage and current requirements

These sit on a single board, with the inputs, outputs, mounting hardware, and protection circuitry built in. There's no separate enclosure to source, no SMPS to match, no DSP-module to wire in: the plate amp does the integration work for you.

NCORE® engineering inside

The Fusion range is the only consumer route to Hypex's NCORE® technology. NCORE modules aren't sold separately to DIY customers; they're available exclusively through the Fusion Amplifier line. NCORE is Hypex's proven second-generation Class D control-loop topology, used inside high-end commercial audio products worldwide. It delivers very low distortion, very low output impedance, and the kind of measurable transparency that rivals or beats traditional linear amplifiers. For a DIY speaker builder, that means commercial-grade amplification inside a fully integrated plate.

Tips for building with Hypex Fusion amps

Building with a Hypex Fusion amplifier is more accessible than most first-time speaker builders expect. The amp itself does the heavy engineering, leaving you with three practical steps: mounting the plate, wiring up the drivers and sources, and configuring the DSP. The sections below cover what matters most at each step.

Mount the amplifier in your speaker cabinet

Installing a Fusion amplifier in a speaker cabinet is straightforward speaker-building work. Each model has specific cut-out dimensions and mounting hole patterns documented in its manual, and you'll want to seal the back panel properly so the cabinet maintains the right internal pressure. Secure the plate with the included hardware, leave room around the heat sink for ventilation, and you have an active speaker in the making. Optional accessories like the Fusion Remote Kit or a Fusion OLED display extend the amp's functionality without changing the basic installation.

Wire up the drivers and signal sources

Once the plate is mounted, the next step is the wiring. Each amplifier output on the plate corresponds to a specific channel in the design (each Fusion model has its own channel layout), and the wires from the drivers go directly to those outputs. On the input side, the amp feeds from a preamplifier, streamer, or DAC, with quality interconnects preserving the performance of the amp you've just integrated. Balanced XLR is the preferred choice for longer signal runs and for any installation where noise rejection matters.

Configure your DSP with Hypex Filter Design

Every Fusion amplifier has full digital signal processing built in, configured through Hypex Filter Design (HFD) software. The software runs on Windows and connects to the amp via USB. Through HFD you set the active crossover points, apply parametric EQ, time-align the drivers, configure input gain, and set the protection limits. Crossover setup is especially central for 3-way active loudspeakers, where each driver gets its own amplifier channel and its own DSP filter. The FAQ below goes deeper into the practical tuning workflow.

Fusion amp Hypex range: Find your perfect match

The Fusion range covers the most common active speaker and subwoofer projects, with channel counts and power levels chosen to match different builds. Two-channel models are designed for 2-way active loudspeakers, with one channel driving the woofer and one driving the tweeter. Three-channel models extend the concept to 3-way designs, where the midrange gets its own amplification, or to 2-way designs with a built-in subwoofer channel. Single-channel models are the choice for dedicated subwoofer builds, with high output and the power-supply headroom needed for low-frequency work. The same range scales up for builders working with dual subwoofer setups and high-power active monitors. Every Fusion amp is engineered as an integrated system, with the amplifier stages, DSP, and power supply calibrated to work together for the type of speaker it's built into.

Key features of Hypex Fusion amplifiers

Every Hypex Fusion amplifier shares the engineering principles that define Hypex's commercial amplifier technology, packaged for direct integration into a speaker cabinet. The table below summarizes the features that matter most for an active speaker or subwoofer builder.

Why Hypex Fusion amps power the DIY revolution

Hypex Fusion amplifiers put the same NCORE technology used inside many of the world's most respected commercial active speakers into a form factor that any audiophile DIYer can integrate into their own build. The measurable performance is there: very low distortion, very low output impedance, and dynamic range that competes with high-end commercial products at many times the price. The integrated DSP eliminates the traditional barrier to active speaker design, putting crossovers, EQ, and time alignment within reach of any builder willing to spend a focused afternoon with the software. For a DIYer who wants to build an active speaker that actually sounds like the high-end designs they admire, a Fusion amplifier is the most direct path there is.

Buy your Fusion amp online at Hypex Direct

Ordering a Fusion amplifier at Hypex Direct is the straightforward process you'd expect from a serious audio shop: Secure checkout, worldwide shipping with UPS, your order on its way from the Netherlands as soon as it's confirmed, and a 14-day return window if the model you chose turns out not to fit your project.

Do you have any questions during your build or your tuning work? The Hypex support team is ready to help you out. We can't promise we're the fastest support team in the world, but we will get it right.

FAQs about Hypex Fusion amplifiers

How do I configure DSP settings on a Fusion amp?

DSP settings on a Fusion amplifier are configured through Hypex Filter Design (HFD), a Windows application that connects to the amp via USB. After connecting, you can set active crossover points between drivers, apply parametric EQ, time-align each driver, configure input gain, and set protection limiters. Presets can be saved, exported, and loaded onto other Fusion amps, making it straightforward to replicate a tuning across multiple builds. Hypex publishes full documentation for HFD, and the support team can help with specific configuration questions when needed.

Are Hypex Fusion amps suitable for multi-way speaker projects?

Yes, and that's one of the things they're designed for. The two-channel Fusion models cover 2-way active loudspeakers cleanly, with each channel driving a separate driver and the DSP handling the crossover. Three-channel models extend the concept to 3-way designs, with separate amplification and filtering for the woofer, midrange, and tweeter. For subwoofer-only builds, the single-channel models give you all the available power in one place. Each model lists its recommended applications, so picking the right Fusion amp for your project comes down to matching the channel count and power output to the speaker design you have in mind.

Which amplifier is best for sound quality?

Sound quality depends on the specific application, the speaker design, and the performance requirements of your build, more than on any single amplifier specification. The amplifier topology (Class D versus linear), the output power relative to speaker sensitivity, the distortion and noise figures, and the DSP integration all play a role. For an active speaker or subwoofer build, the right Hypex Fusion amp is the one whose channel count matches the speaker's driver configuration, whose output power suits the drivers and the listening room, and whose DSP capabilities give you the tuning headroom you need. Each product page lists the relevant specifications so you can match them to your project.

How to tune a fusion amp?

Tuning a Fusion amp is the speaker-builder's final, satisfying step, done entirely in Hypex Filter Design software. A typical workflow:

1. Set the initial crossover points based on the manufacturer specifications of each driver
2. Apply gain matching across the channels so the drivers are balanced
3. Use a measurement microphone and acoustic measurement software to capture the in-room response
4. Apply parametric EQ to flatten the response and address room interactions
5. Time-align the drivers based on the physical offset between them
6. Set protection limiters at safe thresholds for each driver

Hypex publishes documentation for the full HFD workflow, and the support team is available for specific questions during the tuning process. For a first build, expect to spend a focused afternoon getting from a working prototype to a finely tuned active speaker.