Cyrus 40 PSU

The Cyrus 40 PSU is a dedicated external power supply unit built exclusively for the Cyrus 40 Series. At this level of investment, separating the power supply from the signal circuitry is not a luxury — it is the logical conclusion of serious audio engineering, and the 40 PSU exists to deliver exactly that.

Why an External Power Supply Matters

In any audio component, the power supply and signal circuitry share an enclosure and, to varying degrees, the same electrical environment. Noise generated during power conversion — switching transients, ripple, and electromagnetic interference — can find its way into the signal path, raising the noise floor and obscuring low-level detail. Cyrus have addressed this for decades through careful internal power supply design, but the most effective solution is physical separation. The 40 PSU moves power conversion into a dedicated chassis, leaving the host component free to focus entirely on signal processing.

Compatibility with the Cyrus 40 Series

The 40 PSU is compatible with the three core components in the Cyrus 40 Series: the 40 Amp integrated amplifier, the 40 CD player, and the 40 ST streaming transport. Connection is made via a dedicated DIN link, and integration is seamless — the 40 PSU is designed as part of the 40 Series system from the outset, not an afterthought. For those building a complete Cyrus 40 Series system, most serious listeners will want one per component for the full benefit.

Audible Improvements

The benefits of the 40 PSU are not theoretical. On the 40 Amp, the external power supply raises power output from 2 × 100W to 2 × 113W into 6Ω — a measurable and audible improvement in dynamic headroom and low-level composure. Across all compatible components, the 40 PSU delivers a reduction in noise floor that manifests as greater low-level detail, more precise imaging, and a more natural, involving musical presentation. Those who have already experienced the benefit of the Cyrus PSX-R2 on earlier Cyrus components will understand immediately what to expect — and the 40 PSU takes that approach further still.

Design and Build

The 40 PSU shares the same full-width machined aluminium casework as the rest of the 40 Series, sitting flush in a rack or stack without compromise. There are no controls on the fascia because there is nothing to adjust. It does one job and does it without distraction.

Technical Specifications

Who Is It For?

The 40 PSU is for any owner of a Cyrus 40 Series component who wants to hear what their investment is genuinely capable of. If you are building a complete 40 Series stack around the Cyrus 40 CD, the 40 PSU is a logical and worthwhile part of that system — one that delivers improvements that are immediately and consistently audible rather than marginal or theoretical.

Buying from Martins Hi-Fi

Martins Hi-Fi has been in Norwich since 1968. Elizabeth Gould runs the business today, and we stock only brands we have heard properly and stand behind. Dave and Chris have extensive experience with the Cyrus range and can demonstrate the difference the 40 PSU makes in our Norwich showroom — this is exactly the kind of upgrade that benefits from being heard rather than read about.

Contact us at [email protected], call 01603 627010, or WhatsApp on 07554 687137. You can read more about how we work on our Why Martins Hi-Fi page. We are at 85–91 Ber Street, Norwich, NR1 3EY.