Dynavox amplifier
/speaker switch - AMP-S III - black - Dynavox

HiFi Accessories · Amplifier/Speaker Switcher

Anyone running multiple amplifiers or speaker pairs knows the dilemma: either tedious cable swapping at the terminals — or a switcher that degrades the signal more than it helps. The Dynavox AMP-S III solves exactly this problem, without compromise. With its fully aluminium enclosure, a solid 8 mm front panel and internal wiring using 4 mm² copper conductors, this switcher is rated for up to 600 watts per channel — a specification that is hard to match at this price point.

Behind the AMP-S III stands Dynavox, a brand of Sintron Vertriebs GmbH based in Iffezheim, Germany. For more than 20 years, Dynavox has consistently pursued the goal of delivering audiophile quality at a fair price — from valve amplifiers and mains filters to thoughtfully designed HiFi accessories. Specialist publications such as Audio and Stereoplay have regularly reviewed Dynavox products, on more than one occasion displacing considerably more expensive competitors from their rankings. The AMP-S III continues this tradition as the flagship of the switcher range.

At its core, the AMP-S III offers two operating modes: either you switch two speaker pairs on a single amplifier — for instance, main speakers in the living room and a second pair on the terrace or in the study. Or you run two amplifiers into one speaker pair — the classic setup when a dedicated stereo amplifier and an AV receiver for movie nights share the same loudspeakers. In both cases, there is no need to swap cables — a task that is not only cumbersome but also puts mechanical stress on terminals and cable ends over time.

Switching is performed via a heavy-duty toggle switch on the front panel — a tactile, reassuring action with a precise click. Between the two active positions there is a zero position that interrupts all signal paths. This ensures that the connected amplifiers and speakers are never short-circuited during the switching process — a safety detail often missing from budget switchers and one that, in the worst case, can damage power amplifiers.

A switcher sits directly in the signal path between amplifier and speaker — so its electrical quality determines whether the signal remains unaltered or suffers audible losses. The AMP-S III relies on internal wiring with a 4 mm² copper cross-section, equivalent to high-quality speaker cable. The toggle switch itself is designed for high currents and operates with a very low contact resistance — a critical parameter, because any additional resistance in the speaker circuit acts as an invisible damper, robbing dynamics and fine detail.

The enclosure is made entirely from aluminium with an 8 mm front panel that lends the unit an impressive solidity. Beyond mechanical stability, aluminium offers a key electrical advantage: it reliably shields against electromagnetic interference (EMI). In a HiFi chain where switch-mode power supplies, Wi-Fi routers and other noise sources are ever-present, this shielding is not a luxury but a sensible precaution. The rear-mounted binding posts are generously dimensioned and accept both banana plugs and screw-clamp connections — even heavy-gauge speaker cables connect with ease.

Within the Dynavox switcher family, the AMP-S III is the model with the most uncompromising material specification. It succeeds the proven AMP-S MKII and raises the bar significantly with its full-aluminium enclosure, thicker front panel and more generous conductor cross-section. Those who additionally need the ability to switch between two amplifiers and two speaker pairs simultaneously — a full 2×2 matrix — will find the Dynavox AMP-S PRO as the corresponding step up.

For the typical use case — one amplifier with two speaker pairs, or two amplifiers with one speaker pair — the AMP-S III offers the more elegant, sonically purer solution: fewer switch contacts in the signal path mean fewer potential losses. The specialist publication i-fidelity.net highlighted the combination of switching capacity, build quality and the well-conceived protection concept with its zero position when the product was introduced in October 2025. The AMP-S III is available in Black and Silver, blending effortlessly into any HiFi rack with its clean, linear design language.