Match UP 1FX

Match UP 1FX – Compact Class D Subwoofer Amplifier for OEM Upgrades

The UP 1FX is the single-channel subwoofer amplifier of the MATCH UPGRADE family from Audiotec Fischer. It is designed as a direct replacement for factory subwoofer amplifiers and equally as a bass extension for MATCH UPGRADE DSP amplifiers, which can feed it through its mono RCA input. Its footprint is identical to that of the UP 8DSP (46 x 130 x 153 mm), so it fits in vehicles where installation space is tight.

What sets it apart is the combination of high output in a small chassis with OEM-friendly features: a stereo high-level input that sums both channels and accepts up to 32 V, the third-generation ADEP.3 diagnostics protection circuit, an integrated adjustable active crossover and the DirectDSP mode, which bypasses the crossover when a preceding DSP amplifier already handles the filtering. The UP 1FX was awarded Car-Hifi Product of the Year 2024.

Key Features

• High output power: 1 x 350 W RMS at 4 Ohms, 1 x 600 W at 2 Ohms and 1 x 900 W at 1 Ohm, with a maximum of up to 1000 W RMS at 1 Ohm.
• Class D design: Advanced Class D output stage with a very good power-to-size ratio.
• Factory amp replacement: Integrated active crossover, stereo high-level input with signal summing and input sensitivity up to 32 V make it suitable for replacing OEM subwoofer amplifiers.
• ADEP.3 circuit: Prevents modern factory head units from detecting a connected amplifier and reacting with error messages or disabled functions such as the fader, without needlessly loading the radio’s outputs at high volume.
• Mono RCA input: Makes the UP 1FX the natural subwoofer amplifier for MATCH UPGRADE amplifiers.
• DirectDSP function: Bypasses the internal active crossover and sends the unfiltered input signal straight to the output stage.
• Adjustable lowpass: 50–250 Hz, 12 dB slope, can be switched off.
• Subsonic filter: Fixed at 15 Hz with 12 dB slope, can be switched off.
• Start-Stop capable power supply: Operating voltage range up to 18 V, which the manufacturer notes suits modern EVs.
• Clipping LED: Allows quick and accurate gain adjustment.
• Optional remote: A remote control for subwoofer level is optionally available; the amplifier has a dedicated remote control input.
• Compact chassis: Same dimensions as the UP 8DSP for space-saving installation.

Inputs & Outputs

• Inputs: 1 x RCA, 2 x high-level speaker input, 1 x remote in, 1 x remote control input.
• RCA input sensitivity: 0.5–3 V or 1–6 V; input impedance 8.6 kOhms.
• High-level input sensitivity: 2.5–16 V or 5–32 V; input impedance 9–33 Ohms.
• Auto turn-on: The high-level input has an automatic turn-on function.
• Outputs: 1 x speaker output.

Power & Amplifier Section

• Output power RMS: 1 x 350 W @ 4 Ohms, 1 x 600 W @ 2 Ohms, 1 x 900 W @ 1 Ohm; per the manufacturer, continuous 1 Ohm power is achieved only with music signal.
• Frequency response: 10 Hz – 25,000 Hz.
• Signal-to-noise ratio (analog input): 108 dB (A-weighted).
• Distortion (THD): 0.002 %.
• Damping factor: 160.
• Idle current: 1050 mA.

DSP & Sound Tuning

The UP 1FX has no DSP of its own; sound shaping is done with the analog active crossover (lowpass 50–250 Hz and 15 Hz subsonic, both 12 dB and both defeatable). When it is driven by a MATCH UPGRADE DSP amplifier, DirectDSP mode lets the upstream DSP take over all filtering.

Installation & Connectivity Notes

• Operating voltage: 10.5–18 V, briefly (max. 5 s) down to 6 V during engine start.
• Protect mode: If the supply stays below 10.5 V for more than five seconds, the amplifier switches to protect mode (red status LED) to avoid draining the battery further.
• Fusing and current: 2 x 30 A LP-Mini fuse (APS); power rating DC 12 V, 80 A max.
• Operating temperature: -40 °C to +70 °C.
• Dimensions (H x W x D): 46 x 130 x 153 mm.

Technical Specifications

* Continuous 1 Ohm power achieved only with music signal

Scope of Delivery

1 x Amplifier MATCH UP 1FX
1 x Mounting plates and material
1 x Instruction manual