Kanto SUB 8
Kanto SUB 8 sealed powered subwoofer, fitted with a 20.3 cm woofer and an adjustable low-pass filter, designed to complement a compact speaker.
Description
The Kanto SUB 8 is a sealed-design powered subwoofer, intended to complement an existing speaker system. It provides the low-end extension that small speakers often lack, while keeping a limited floor footprint thanks to its compact format.
Its woofer is a 20.3 cm paper cone, driven by a total power of 150 Watts RMS. The frequency response extends from 35 Hz to 175 Hz, covering the lower part of the audible spectrum up to the lower midrange. The low-pass filter is adjustable between 40 Hz and 120 Hz, allowing precise adjustment of the crossover point with the main speakers. A two-position phase switch, 0° and 180°, helps correct interference between the subwoofer and the rest of the system depending on its placement in the room.
Connectivity is limited to a stereo left/right RCA input, which simplifies connection to an amplifier or preamplifier with a dedicated subwoofer line output, or to any standard stereo source.
This subwoofer is aimed at those looking to reinforce the bass of a compact system, particularly alongside small bookshelf speakers, without adding to the floor footprint. Its format and controls make it a suitable complement for listening in a modest-sized room where the subwoofer's placement needs to remain flexible.
Technical specifications
| Power | 150 Watts Total RMS |
| Frequency response | 35 Hz – 175 Hz |
| Woofer | 20.3 cm (8 inch) paper cone |
| Low pass filter | 40 Hz - 120 Hz |
| Phase switch | 0° and 180° |
| Inputs | 1 x RCA (L / R) |
| Dimensions (H × W × D) | 28 x 28 x 30.3 cm |
| Weight | 8.3 kg |
What to check before buying used
On a powered subwoofer like the SUB 8, test the built-in electronics module: listen for any hum or crackle at rest, often linked to the capacitors or the level potentiometer. Check the suspension of the 20.3 cm woofer through the grille (sagging, cracks) and operate the phase switch and low-pass filter to confirm they remain firm throughout their travel. Finally, inspect the RCA input, whose contacts oxidise over time and can cause cut-outs or background noise.
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