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C-Series · Cinema Subwoofer
C21s
Cinema Subwoofer
Single 21″ · Sealed · Passive · Flagship
Hot
Description
Nothing in this market does what the C21s does. A single 21″ driver. A sealed enclosure. A luxury cabinet. One statement piece for rooms that deserve a singular answer.
The 21″ advantage
44% more
cone area.
The 21XL3000 presents 1,744cm² of radiating cone area — 44% more than the 18″ driver in the C18s. At low frequencies, cone area is the fundamental determinant of air displacement. More area means more bass at lower distortion, from a lower-power amplifier.
The C21s achieves 127dB peak SPL with a single 800W amplifier channel — comparable to two C18s units combined, driven from one channel at lower amplifier power. For integrators designing rooms where a single dominant subwoofer is preferred over an array, the C21s is the only answer in this class.
The C21s achieves 127dB peak SPL with a single 800W amplifier channel — comparable to two C18s units combined, driven from one channel at lower amplifier power. For integrators designing rooms where a single dominant subwoofer is preferred over an array, the C21s is the only answer in this class.
21″ vs 18″ — the physical difference
Physics of the 21″
More air.
Less effort.
The 21XL3000 moves 44% more air per millimetre of excursion than an 18″ driver. In a cinema room, this means the driver reaches reference bass levels with less peak excursion — reducing distortion at the exact frequencies where LFE content is most demanding.
The 6.5″ voice coil dissipates heat across a substantially larger surface area than any 18″ driver can offer. Two-hour cinema sessions at reference levels do not produce thermal compression in the C21s. The performance at the end of a film is identical to the beginning.
And because this is a single-driver design, the integrator needs one amplifier channel, one crossover point, and one set of room correction filters. The system is simpler to configure and to calibrate — without sacrificing the acoustic result.
The 6.5″ voice coil dissipates heat across a substantially larger surface area than any 18″ driver can offer. Two-hour cinema sessions at reference levels do not produce thermal compression in the C21s. The performance at the end of a film is identical to the beginning.
And because this is a single-driver design, the integrator needs one amplifier channel, one crossover point, and one set of room correction filters. The system is simpler to configure and to calibrate — without sacrificing the acoustic result.
Performance
The flagship.
Unanswered.
The C21s reaches ~25Hz in-room at the listening position — approaching the physical threshold of human hearing — with a single driver, a single amplifier channel, and a cabinet that fits within the depth of a standard baffle wall. No dual-driver system. No complex multi-channel amplification. One piece of engineering that answers the room.
Cabinet engineering
One driver.
Every detail earned.
The C21s cabinet is wider and deeper than the C18 family — dictated entirely by the 535mm basket diameter of the 21XL3000. Every dimension derives from a physical constraint, not a design preference.
Technical specifications
C21s
All measurements in standard conditions unless stated
Acoustic Performance
Physical
Passive design
Your amplifier.
Your DSP.
Your room.
In-room frequency extension figures assume front-wall placement in a treated cinema room. Boundary gain of approximately 6–8dB below 80Hz is expected in this configuration. The volume reduction shelf that achieves Qtc 0.65 is a sealed internal component — it does not affect cabinet external dimensions or installation footprint. Driver cutout diameter, bolt circle PCD, and surround recess dimensions for the 21XL3000 are confirmed at production by the acoustic engineer prior to CNC programming.
Ownership
Built for decades. Backed without conditions.
Home trial
60 days in your room
The only meaningful audition is in your own space, on your own system. The C21s arrives at your door. You listen. If after 60 days it does not belong in that room, contact us and we arrange collection. No restocking fee. No conditions. No questions that require an answer.
Warranty
Ten years. Transferable.
Full parts and labour coverage for ten years from the date of purchase. The warranty transfers to subsequent owners on private resale — register the new owner and full coverage continues. We build loudspeakers intended to last a generation. The warranty reflects that intention.
Support
Direct to the engineers
V&Y concierge support connects you directly to the people who designed the C21s — for setup, room placement, amplifier pairing, and long-term system guidance. No call centres. No support tickets. The person who answers understands the speaker from the inside.
Direct to customer
No intermediaries. Ever.
V&Y sells exclusively direct. No importers, no dealers, no showrooms. The price you see is the price you pay — worldwide shipping and all applicable duties and taxes included. Every element of the customer relationship remains with us, from order to ownership.
Finish options
Five finishes. All hand-applied. All to specification.
Each finish is applied in controlled stages. Coats are flat-sanded between applications. Every surface is inspected under raking light before the next layer is added. The cabinet clears our facility only when it meets a written surface specification — not a visual judgment, a documented standard.
Custom RAL colours available on request for orders of two pairs or more. Lead time 8–10 weeks. Contact us to discuss.
The C-Series
Three models.
One cinema philosophy.
Shipping & Delivery