Fyne Audio Classic Gold XV SP

The Classic Gold XV SP is a large-format floorstanding loudspeaker from Fyne Audio's Classic Gold series — a heritage-influenced design built around a 380mm IsoFlare point-source driver with a 75mm titanium dome compression tweeter, housed in a high-density birch ply cabinet with extensive internal bracing. Frequency response extends from 23Hz to 26kHz, sensitivity is 97dB, and the recommended amplifier power range of 20–400W makes it compatible with everything from low-powered single-ended valve amplifiers to the most powerful solid-state designs available. The Classic Gold series draws on the aesthetic traditions of classic British loudspeaker design whilst applying Fyne Audio's current driver, port, and crossover engineering — the XV SP is the largest and most capable expression of that approach.

The 380mm IsoFlare driver is the largest point-source unit that Fyne Audio produce, shared with the Vintage Fifteen. At this diameter, the cone moves exceptional volumes of air with minimal effort — which is why 97dB sensitivity is achievable alongside 23Hz bass extension. The combination of that driver, a birch ply cabinet, a twin-cavity BassTrax port system, and a bi-wired crossover with Full Cryogenic Treatment places the Classic Gold XV SP in a very small group of loudspeakers capable of this specification at this price.

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 from the same point in space. This point-source behaviour produces consistent time alignment between bass, mid, and treble across the listening area, and isotropic dispersion — sound radiating evenly in all directions — rather than the high-frequency beaming of a conventional separated-driver arrangement.

In the Classic Gold XV SP, the IsoFlare driver is a 380mm multi-fibre cone paired with a 75mm titanium dome compression tweeter. The 75mm titanium dome handles far higher output levels with lower distortion than a 25mm dome driver — at the dynamic levels that 97dB sensitivity makes available, this is not a marginal consideration. The crossover divides at 750Hz, giving the IsoFlare unit a wide operating range that a driver of this size and mass is uniquely equipped to manage with composure.

BassTrax and Twin-Cavity Loading

The downfiring port connects to a BassTrax Tractrix diffuser at the base. Twin-cavity loading within the cabinet gives the bass section additional acoustic control below the port frequency, contributing to the 23Hz bass extension. The Tractrix profile smooths the transition between port output and room, reducing port colouration and floor-boundary reflection. The result is a speaker that is meaningfully less sensitive to room placement than its physical size might suggest.

Crossover

The crossover divides at 750Hz — 2nd order low-pass on the bass/midrange, 2nd order high-pass on the tweeter. It is a bi-wired passive low-loss design with Full Cryogenic Treatment applied to all components. System adjustments for high-frequency energy (750Hz–26kHz, ±3dB) and presence (2.5kHz–5kHz, ±3dB) are available on the rear panel, allowing independent tonal fine-tuning to room acoustics and partnering equipment.

Cabinet Construction

The cabinet is high-density birch ply with extensive internal bracing — a more rigid and better-damped structure than MDF. The Classic Gold XV SP sits on its own integral base, which integrates the BassTrax diffuser. The Walnut finish is the standard option for the Classic Gold series, consistent with the heritage aesthetic of the range.

Technical Specifications

Who Is It For?

The Classic Gold XV SP is for the listener with a large room and a serious system who values the heritage aesthetic of classic British loudspeaker design alongside current driver and crossover engineering. At 97dB sensitivity, a 20-watt single-ended triode amplifier will drive it to levels that fill a substantial room — and the 400W upper limit gives high-powered solid-state amplification complete headroom. The 23Hz bass extension covers the full range of recorded music without subwoofer augmentation.

Those deciding between the Classic Gold XV SP and the Fyne Audio Vintage Fifteen should audition both — the two speakers share the same 380mm IsoFlare driver but differ in cabinet construction, dimensions, and the finishing details of the Classic Gold series aesthetic. For those whose systems and rooms suit a more compact form, the Fyne Audio Vintage Five brings the same IsoFlare philosophy to a standmount cabinet. The F704SP is the natural comparison within the SP range for those who prefer the F700 series cabinet format, and the Fyne Audio SuperTrax super tweeter extends HF performance further for those who wish to push the Classic Gold XV SP's bandwidth.

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 Classic Gold XV SP is available to discuss and audition at our Norwich showroom — at this level a demonstration is not optional, and we ask that you call ahead so we can give it the time it deserves. Dave and Chris can advise on amplifier matching, room requirements, and how the Classic Gold XV SP compares with other large-format Fyne Audio designs.

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.