Infinity Primus PS-8 (2003)
A compact powered subwoofer from Infinity’s Primus series, delivering solid low-end extension with an 8-inch driver and 100 watts RMS output.
Overview
The Infinity Primus PS-8 is a powered subwoofer produced in 2003 by Infinity Systems, Inc., part of the broader Primus series lineup. Designed for home audio integration, it features an 8-inch driver and a built-in amplifier rated at 100 watts RMS. With a frequency response of 35 Hz to 150 Hz (±3dB), it provides controlled bass output suitable for smaller to mid-sized listening environments. The unit includes both line-level and high-level inputs, an LFE input, phase switch, and rear-panel level and crossover frequency controls, allowing for flexible setup in various systems.
Specifications
| Power Output | 100 watts RMS |
| Frequency Response | 35 Hz – 150 Hz (±3dB) |
| Crossover Frequency | 150 Hz |
| Driver Size | 8 inches |
| Dimensions (WHD) | 270 x 445 x 426 mm (10.6 x 17.5 x 16.8 in) |
| Weight | 15 kg (33 lb) |
Design
The Primus PS-8 is a self-contained powered subwoofer with a compact cabinet design noted for its clean, unobtrusive styling. It integrates a plate-mounted amplifier and includes both line-level and high-level input options, supporting versatile connectivity with receivers and amplifiers.
Market
Used units have sold for €100 in the Netherlands (Hifishark, Feb 2026) and $180 AUD on Australian forums (Stereonet, 2019). Some owners report a humming noise as a potential issue, though the subwoofer generally holds a quiet respect among vintage audio enthusiasts for its solid performance.
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