Grado SR325x

Summit of the Prestige series, the SR325x embodies the culmination of nearly seven decades of craftsmanship expertise at Grado Labs. This open-back wired headphone represents the fourth generation of a lineage that began more than thirty years ago, perpetuating the house’s sonic philosophy while integrating substantial technical innovations. Hand-assembled in the Brooklyn factory, the SR325x is distinguished by its machined aluminum housings, a unique visual and acoustic signature in the Prestige range, and by its new 44mm transducers specially developed for this model.

A metal housing for surgical precision

The SR325x immediately stands out from its younger siblings with its brushed aluminum housings, where other models in the Prestige series use ABS plastic. This metal construction is not merely aesthetic: it gives the headphone a density and rigidity that optimize the control of parasitic resonances. The woven metal rear grilles replace the simple perforations found on lower models, allowing the transducers to breathe freely while preserving a certain visual elegance.

The genuine leather headband features distinctive white stitching, exclusive to the SR325x in the Prestige series. Unlike less expensive models that use synthetic materials, this leather brings a welcome touch of refinement, even if the absence of substantial padding may surprise at this price level. The metal joints allow complete rotation of the earpieces and vertical adjustment by sliding, a simple but proven system that Grado has used for decades across its entire range.

The cable is part of the major improvements of this “x” generation. Composed of eight super-annealed copper conductors, it is now housed in a thicker and more resistant sheath than that of previous generations. This thermal treatment of copper improves its malleability while reducing its fragility, theoretically contributing to purer signal transmission. The cable remains non-detachable, a design choice that Grado maintains by conviction rather than economy, and terminates with a 3.5mm jack plug accompanied by a 6.35mm adapter.

Fourth-generation transducers: evolution in continuity

The new 44mm transducers constitute the heart of the improvements made to this generation. Grado has redesigned the magnetic circuit to make it more powerful, reduced the effective mass of the voice coil, and reconfigured the diaphragm. These modifications aim to improve efficiency, reduce distortion, and preserve the harmonic integrity of the musical signal. With an impedance of 38 ohms and a sensitivity of 99.8 dB, the SR325x remains remarkably easy to drive, functioning properly from a smartphone while revealing more nuances with a quality source.

The frequency response extends from 18 Hz to 24 kHz, but these figures tell only part of the story. The SR325x adopts a more balanced sonic signature than its predecessors, notably the SR325e known for its more analytical presentation. The bass gains presence and extension, offering surprising physical impact for an open headphone, without encroaching on the midrange register. This new warmth in the lower spectrum makes the headphone more versatile in terms of musical genres, where older generations could seem too lean on certain recordings.

The midrange retains that characteristic texture and presence of Grado, with vocals particularly well served. Acoustic instruments benefit from striking naturalness, with timbre remaining faithful without excessive coloration. The treble, traditionally the point of contention for the brand’s detractors, has been judiciously tamed. It retains its clarity and extension without becoming sibilant or fatiguing, even during extended listening sessions.

F cushions: an assumed technical choice

The flat F-type cushions supplied with the SR325x mark a change from the L (bowl) cushions used on the SR325e. These new cushions, initially introduced with the limited edition Hemp model, position the transducers closer to the ears. This proximity reinforces dynamic impact and brings a warmer sonority to the whole.

However, this choice divides users. The F cushions can create direct pressure on the ears, particularly uncomfortable for certain morphologies. The foam, while functional, lacks refinement in its texture and its durability remains perfectible - a recurring criticism of Grado. Purists will nevertheless appreciate that the headphone is tuned specifically for these cushions, any change significantly modifying the sonic signature intended by the manufacturer.

Notable evolution compared to the previous generation

The comparison with the SR325e reveals the extent of the changes made. Where the “e” model favored a very analytical approach with prominent treble and recessed bass, the SR325x adopts a more coherent and accessible presentation. The bass gains depth and definition, creating a solid foundation for the entire spectrum. The midrange, slightly warmed, offers more body to instruments and voices without sacrificing precision.

This evolution responds to criticisms made against previous generations, judged too bright and potentially fatiguing. The SR325x nevertheless retains that liveliness and energy that make Grado’s signature, but in a more mature and refined presentation. Old school enthusiasts may regret this less cutting approach, but the majority will appreciate this increased versatility.

The shift from 32 to 38 ohms impedance and the slight decrease in sensitivity (from 99.8 dB/mW to theoretical 98 dB) do not significantly affect ease of driving. The headphone remains usable with portable sources, even if a dedicated amplifier or quality external DAC will allow full exploitation of its potential.

Technical Specifications

Audio Specifications

• 44 mm drivers
• Frequency response: 18 - 24,000 Hz
• Sound pressure level 1 mW: 99.8 dB
• Nominal impedance: 38 ohms
• Driver matching 0.05 dB

Design and Materials

• Headphone type: on-ear, open-back
• Metal housing
• Leather headband
• F cushion

General Information

• Weight: 300 g
• Accessories: 6.35 mm adapter