Fyne Audio F501SP Bespoke RAL Classic Colour Finish

The F501SP is a 2.5-way floorstanding loudspeaker from Fyne Audio's Special Production range — a UK-exclusive model that takes the F501's floorstanding format and applies a comprehensive set of SP-specific engineering upgrades, including a driver derived from the F700 Series, an upgraded crossover, and an aluminium sandwich plinth with BassTrax downward-firing porting inherited from above. In its bespoke RAL Classic colour finish, it is available only through selected Fyne Audio dealers and configured to order from the full RAL Classic palette.

The SP treatment here is substantive. The IsoFlare driver is the same SP-specific unit found in the F500SP and F501SP — a 150mm multi-fibre cone with FyneFlute surround and a 25mm magnesium dome compression tweeter — and the crossover integrates the drivers more precisely within the existing cabinet volume. The aluminium sandwich plinth improves mechanical stability at the base of the cabinet and refines the BassTrax downward-firing porting system. A fifth binding post grounds the driver chassis and reduces RF interference in the circuit. Diamond machine-cut detailing on the aluminium driver chassis and an anodised machined aluminium plinth complete the cosmetic specification.

SP IsoFlare Driver Technology

The IsoFlare driver combines the bass/midrange cone and the high-frequency compression tweeter on a shared axis — the tweeter fires from the centre of the bass/midrange cone — so both drivers radiate sound from the same point in space. This point-source behaviour produces consistent time alignment across the listening area and off-axis coherence that a conventional separated-driver arrangement cannot replicate.

The SP IsoFlare driver in the F501SP uses a twin-magnet motor system and FyneFlute roll surround. The FyneFlute surround geometry reduces cone resonances at the driver termination — the point where the cone meets the surround — which affects transient accuracy and midrange clarity. A second 150mm bass driver handles the frequencies below 250Hz, leaving the IsoFlare unit to operate across the midrange and treble.

BassTrax Tractrix Diffuser and Aluminium Sandwich Plinth

The downfiring port exits through an aluminium sandwich plinth incorporating Fyne's BassTrax Tractrix profile bass diffuser. The Tractrix profile maintains a consistent expansion angle as bass energy leaves the port, reducing reflections and smoothing the transition between port output and room. The aluminium sandwich construction of the plinth adds mechanical rigidity at the base of the cabinet — reducing energy storage in the base structure and improving the definition of bass frequencies that couple through the plinth to the floor.

Upgraded Crossover and Fifth Terminal

The SP crossover integrates the drivers more precisely within the existing cabinet, using higher-specification components than the standard S Series crossover. The fifth terminal on the connection panel grounds the driver chassis, reducing RF interference in the circuit — a detail that reflects the engineering thoroughness of the SP specification rather than a cosmetic addition. The bi-wire connection panel provides two pairs of terminals for those who want to run separate amplification for the bass and mid/treble sections.

The RAL Classic Colour Process

RAL Classic is the internationally recognised colour standard used across architecture, product design, and industrial finishing. The F501SP bespoke finish uses the RAL Classic system — several hundred defined colours — applied to the same high-gloss cabinet finishing process as the standard Piano Gloss range. The bespoke colour option is available exclusively to the UK market through selected dealers including Martins Hi-Fi.

Lead times for bespoke colour finishes are longer than standard stock items. We can show RAL Classic colour swatches in our Norwich showroom and discuss how different colours read in different lighting conditions — an important consideration when specifying a finish for a domestic installation. We work with you through the full process, from initial colour selection to final specification.

Technical Specifications

Who Is It For?

The F501SP in bespoke RAL finish is for the buyer who wants the SP Series floorstanding specification — upgraded IsoFlare driver, refined crossover, aluminium sandwich plinth — in a mid-size cabinet, finished in a colour that integrates with their interior rather than contrasting with it. It suits a listener with a small to medium room who wants a genuine SP-engineered floorstander without the physical scale and price commitment of the F502SP or F704SP.

For context within the SP range: the F500SP is the SP Series standmount in bespoke RAL finish — sharing the same SP IsoFlare driver in a compact two-way enclosure. The F704SP is the flagship SP floorstander with twin 300mm drivers and F1 Series crossover technology. The SuperTrax super tweeter is a natural high-frequency complement to any SP Series system, and the F701SP standmount is the SP Series standmount for those who want a larger-driver SP standmount option.

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. The F501SP is available to hear in our Norwich showroom — call ahead and we will arrange a relevant demonstration. Dave and Chris can guide you through the RAL colour selection process, advise on lead times, and discuss amplifier matching and room suitability for the F501SP in your system.

Contact us at info@martinshifi.co.uk, 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.