REL Reference Series No.31 
 
No.31 is nothing less than a pure reference model, sculpted from the flanks of the remarkable No.32, but using a newly developed 12″ (350mm) all carbon fiber driver. 
 
Every facet of No.31 has been comprehensively upgraded and refined from its predecessor. 
 
No.31 delivers the classic Reference filter used in No.32, the same dual parametric filters, a driver that handles three times the power to deliver a truly thrilling experience.
 
When Only the Best Will Do 
(BUT YOU’VE RUN OUT OF ROOM)
No.31 exists to satisfy the needs of those who crave the finest yet have space limitations. Whilst some can afford our flagship No.32 model, it is larger and deeper than some rooms can accommodate. How can you best deliver No.32’s sound quality, build quality, and thoughtful features with a more compact footprint? Enter No.31.
 
Arrayed for Battle
No.31 permits the same vertically stacked line array as the ultimate No.32. It delivers transformative performance that no competitor has been able to. For those who have been seeking the ultimate musical and theatre experience, Line Arrays unlock the final dimension of system reproduction. Audiophiles have chased three-dimensional sound for years, yet they have missed the simple fact that the height—not the depth—of image is the missing link. By creating products that are designed to be stacked 3 (or in exceptionally tall rooms, 5) units high while retaining individual crossover and gain control of each subwoofer in the array, REL has created a masterpiece that finally delivers what the most experienced audiophiles have been chasing for the past 40 years.
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 About the Reference Series:  
 
THE PINNACLE
REL's Reference subwoofers allow them the opportunity to pursue the perfect reproduction of sound, while letting nothing get in the way. Their designers and engineers dream big and take huge leaps in innovation. The result is truly reference level subwoofers that can extend the soundstage of the most renowned speakers and systems, bringing incredible clarity to the mid-tones in perfect synchronicity.
 
REFERENCE, DEFINED
The Reference Series marks a new standard in cabinet execution, merging physical beauty with functionally elegant components. The shape of these subwoofers is designed to handle the force required to meet your music or film’s demands. Reference Series is built to produce clear, purposeful bass that strides into a room with tremendous energy and clarity.
 
AGILE POWER
Offering a thorough exposition in the art of rendering sub bass with great deftness in tonality, expression, and dynamics, Reference Series brings to life the contrast between loud and soft passages with unparalleled dynamics. Experience the legendary REL sound that has nearly become an addiction for owners of their subwoofers.
 
ABSOLUTE CONTROL
Your relationship with Reference Series begins by picking up the remote. The heft and thoughtful contours fit gently in the cup of your hand, offering the first touchpoint of a carefully wrought system. No detail has been overlooked, encouraging the sort of finely detailed decisions necessary to achieve the perfect balance of settings for the ultimate user experience.