45 Years In The Making
Forty-five years ago, Spendor developed the first loudspeaker with real transparency, articulation and natural sound specifically for BBC engineers who were mixing orchestras for live radio playback and needed to hear exactly what each musician was playing.
Over time and through their exhaustive R&D efforts, Spendor engineers achieved a series of technical breakthroughs and the company went on to become one of England’s leading loudspeaker manufacturers. Spendor continually developed landmark loudspeakers, always remaining true to the Spendor sound but also consistently improving transparency and thus creating “better” loudspeakers.
Three years ago, Spendor introduced the D7 which delivered an articulate, coherent and natural presentation, with a level of transparency never before heard in a conventional dynamic loudspeaker. As a result, the D7 became the most critically acclaimed Spendor ever, earning Stereophile’s coveted Class A recommendation - a remarkable accomplishment for a $6,000 loudspeaker.
Today, the new D9 takes the D7’s brilliance a step further. An elegant, modern, 3-way loudspeaker, the D9 delivers music with exceptional resolution and a vibrant realism with any genre. Easy to drive and highly efficient, the D9 is also remarkably flexible and can be placed in any living environment. This is a speaker 45 years in the making. This is the Spendor D9.
Spendor LPZ (Linear Pressure Zone) Tweeter
The goal of every tweeter designer is to achieve linear acoustic output over a wide frequency range. In practice this is extremely difficult. Spendor’s approach to this age-old challenge is radical, and it works. The Spendor LPZ tweeter is built around a stainless steel front plate which forms a damped acoustic chamber directly in front of a lightweight woven polyamide diaphragm. The front plate incorporates a phase correcting micro foil to equalize sound wave path lengths across the diaphragm surface, simultaneously it generates a symmetrical pressure environment on both faces of the tweeter diaphragm so the tweeter operates in a balanced linear mode. The front plate also provides excellent mechanical protection for the delicate tweeter dome and a smart modern appearance.
New Drive Units Developed For D9
The D9 mid-bass drive unit has an advanced EP77 polymer cone mid-range drive unit. Housed in an isolated enclosure at the top of the cabinet, it handles only mid-range frequencies which eliminates mid-low frequency intermodulation. It delivers music with superb clarity and vanishingly low colouration. The two D9 low frequency drivers have ultra-rigid, two part bonded, lightweight Kevlar composite cone assemblies. The drivers are in a large dedicated low-frequency acoustic enclosure.
Like Spendor’s highly regarded A9 loudspeaker (now superseded by D9) the D9 delivers accurate powerful bass without distortion or compression. All three drivers feature cast magnesium alloy chassis, high efficiency motor systems, optimized electro-dynamic damping, and excellent thermal dissipation for wide dynamic range. New polymer surrounds with very stable molecular composition reduce driver ‘break-in’ time significantly.
New Fifth Generation Spendor Linear Flow Port
When extended low frequency sound reproduction is the goal there is simply no substitute for volume. In the D9 low frequencies are handled by two specially designed bass drivers in a substantial volume enclosure. For optimum low frequency response and power handling the enclosure is ported, but not like a conventional loudspeaker. The D9 incorporates our latest 5G Spendor Linear flow port technology. Inspired by Formula 1 diffuser technology, it offers significant advantages over any conventional port or transmission line loading. An aerodynamically profiled central baffle, like an aircraft wing, creates a tapered twin-venturi port. Air at the port extremities is smoothly decelerated and there is a further reduction in air velocity in the large tapered area at the cabinet base. The result is evenly balanced acoustic pressure and air-flow along the whole length of the port. Rapidly decreasing air velocity at the port extremities creates an air-curtain effect to eliminate port noise and spurious mid-band radiation. A carefully optimized combination of bass driver electrical and mechanical parameters, enclosure volume, air flow and wide-band (very low-Q, very low phase shift) port tuning allows the D9 to deliver deep, fast, articulate bass in a way no conventional loudspeaker can challenge.
Unconstrained Internal Airflow
Conventional loudspeakers incorporate foam or fiber to provide low frequency acoustic damping. The damping material stores energy. As stored energy is released it is no longer in time with the music and it creates an unnaturally, heavy, slow sound. Inside the D9, the sound path, from the bass drivers to the listening room is unrestricted, there is no low frequency damping. As a result the Spendor D9 is entirely free from damping material energy storage effects, the advantage is clearly audible, music sounds naturally fast, agile and coherent.
Spendor Dynamic Cabinet Damping
Timing is fundamental to the musical experience. In conventional loudspeakers rigid high density cabinet panels are mass-damped to reduce cabinet-talk. Spurious energy is stored and released slowly. This introduces unacceptable blurring and slowing of the sound. Spendor’s solution is asymmetric aperture bracing of the cabinet to disperse internal waves. Dynamic Damping with small low mass constrained polymer dampers at key energy interface points instantly convert any spurious energy in the cabinet structure into inaudible heat. The result is a silent rigid cabinet and a naturally fast clear sound.
The base of the cabinet has four levelling feet attached via forged steel inserts to hold the cabinet rock steady. The elimination of micro-vibration allows fine musical detail to be reproduced with delicate precision.
A meticulously refined crossover network with precision wound inductors and high-linearity plastic film capacitors integrates the drivers seamlessly in a minimum phase alignment. Each crossover component and every complete pair of Spendor loudspeakers is calibrated and matched to stringent broadcast reference standards.
90dB efficiency and an easy to drive 8 ohm load ensure complete compatibility with a wide range of amplifiers and cables. With substantial power handling the D9’s can play very loud without sounding compressed. At low replay levels the sound is always clear and balanced.
Elegant Modern Design
The Spendor D9 looks as good as it sounds. Our premium finishes perfectly complement today’s modern interiors.
Description: 3 way floor standing loudspeaker
Enclosure type: Rigid, asymmetric braced, vented cabinet with dynamic damping
Vent type: Fifth generation Spendor linear flow, tapered twin-venturi port
Input connection: Single pair recessed precision binding posts
Typical in-room response: 27Hz - 25kHz
Power handling: 250 watts unclipped programme
Sensitivity: 90dB for 1 watt at 1 metre
Nominal impedance: 8 ohms
HF driver: Spendor 22mm LPZ polyamide dome
Mid driver: Spendor 7" EP77 polymer cone
Bass driver: 2 x Spendor 7" Kevlar© composite cone
Crossover frequencies: 500Hz, 4.2kHz
Net Weight: 87lbs
Dimensions (HxWxD): 44.3" x 8.3" x 15.2"
Finishes: Cherry, Dark Walnut, Black Ash, Rosewood
Accessories: Height adjustable spike feet, grille, non-slip polymer feet