Bass S04

Overview

The Bass S04 Active is a powered subwoofer from Revox designed for use in high-quality stereo or home theatre systems. Depicted as the bass component of a premium audio setup, it features a built-in amplifier and acoustic decoupling to deliver deep, controlled low frequencies. 
With a rather compact footprint (approx. 400 × 418 × 450 mm) and weighing about 24.7 kg, it’s engineered not merely for home cinema but also serious two-channel music systems where bass control and fidelity matter.

Key Features

• 250-watt built-in amplifier driving the subwoofer section for deep bass impact.

• Large 260 mm (≈10″) woofer/midrange driver to handle low frequencies effectively.

• Frequency range specification: around 30 Hz-200 Hz (or in some specs 27 Hz-200 Hz) for the low end.

• Acoustic decoupling via included spikes to isolate the cabinet from the floor and reduce vibration transfer.

• Line input (2.0 V level) and according to some sources an LFE/line switchable input; suitable for both stereo and cinema use.

• Finish options include matte black or white, allowing integration into various décor schemes.

Sound Quality & Suitability

In a high-end audio system, the Bass S04 Active offers a few significant advantages:

• The built-in amplification and dedicated low-frequency driver mean the system can deliver impactful bass without relying solely on the main speakers, allowing them to focus on mid- and high-frequencies.

• Its decoupled cabinet (via spikes) helps reduce floor-borne vibration and “boominess”, which is especially beneficial in vinyl or high-resolution stereo systems where clarity and fidelity are priorities.

• Because of the frequency coverage down around 30 Hz, the subwoofer can support large musical dynamic swings and provide more “room-filling” bass presence without overwhelming the rest of the system.

• For stereo systems (not just home theatre), this subwoofer can relieve the left/right main speakers of their lowest octave responsibilities, letting them perform more freely — making it a valuable add-on for high-end setups that require deep bass support.

Installation & Integration Tips

• Positioning: Place the subwoofer near a wall or corner may reinforce bass, but ensure vibration isolation is maintained (via spikes) and avoid placing directly on thin or resonant flooring.

• Level matching: Use the subwoofer’s input level control (if provided) to align the bass level with the rest of the system; too high may draw attention, too low may under-utilise its potential.

• Crossover setting: Choose a crossover frequency that complements your main speakers — e.g., if mains roll off around 40-50 Hz, set the sub around that region so there’s a smooth transition.

• Phase adjustment: If available, ensure the subwoofer is in-phase with the main speakers to avoid bass cancellation or muddy response.

• Cartridge/record playback systems: In vinyl systems, deep bass from records tends to demand high mechanical stability. Good isolation and low vibration from the subwoofer will help maintain overall system performance.

• Room tuning: Considering use in a high-end stereo room, take time to listen from the primary listening position and adjust sub position/level to integrate seamlessly with the main speakers.