First and foremost, the Quad 9AS is a high-performance compact loudspeaker, small enough to sit on a desk
or shelf, yet large enough to deliver a powerful and detailed high-resolution sound. Easily attaining the sonic
accuracy required of a near-field studio monitor, the 9AS displays its heritage with a smooth frequency
response, supplemented by a three-position bass EQ facility that equalises the low-frequency response for
free standing, shelf and close-to-wall mounting. You can be sure that wherever these speakers are used –
whether at home or in a studio environment – they deliver crisp, clear and musically insightful results.
Excellent versatility
The Quad 9AS offers a remarkably wide range of inputs to suit multiple source components, from PCs, Apple
Macs and portable audio devices, to traditional hi-fi components. Digital connections are provided via
asynchronous USB and S/PDIF (optical and coaxial), all capable of receiving audio data up to 24-bit/192kHz,
supplemented by line-level RCA inputs for analogue signals. A side-mounted 3.5mm input is also included
for convenient connection of portable audio devices.
Each 9AS pair comprises a ʻmasterʼ and a ʻslaveʼ, both containing 100 watts of audiophile-grade Class AB
power amplification (much higher quality than the Class D amplification found in many active speakers). The
master speaker accepts all inputs and handles volume and input selection, operated via a neat touch-
sensitive panel on the base of the speaker (a remote control is also supplied), while the slave speaker is fed
via a line-level output from the master speaker. An output for an external subwoofer facilitates ultra-low
frequency extension where required – Quadʼs recently launched, compact yet powerful L-ite Plus Subwoofer
is a perfect match, both aesthetically and sonically.
Technical prowess
Many active speakers simply shoehorn their electronics into the speaker cabinet, but not so the Quad 9AS.
To enable optimum performance, maximum internal volume is given over to the drive units, while the
amplifier is housed in a cast aluminium chassis bonded to the base of the cabinet. This aids low frequency
performance whilst also ensuring efficient heat dissipation.
For digital signals, amplification begins with the same high-precision 24-bit/192kHz DAC found in Quadʼs
Elite CD players. All signals are passed, via a low-noise electronic volume control, to twin Class AB power
amplifiers tailored to the individual drive units in each speaker: a classic Quad mid/bass unit with a 100mm
woven Kevlar cone, plus a newly designed 25mm fabric dome tweeter with a waveguide incorporated into its
front plate. These drivers are coupled via a sophisticated Butterworth crossover network, modelled to provide
the exact acoustic integration demanded by Quadʼs speaker engineers.
The incorporation of multiple digital and analogue inputs, pre-amplification and power amplification in a pair
of compact speakers delivers obvious space-saving convenience and versatility, augmented by the three
bass EQ settings to ensure suitability for a variety of locations. This design approach has benefits in terms of
sound quality, too, ensuring short signal paths and perfectly matched amplification thanks to Quadʼs
integrated engineering approach. Each 9AS speaker can be switched into and out of standby via a standard
12V trigger signal, further increasing versatility in a custom installation environment.