Single 21 inch 6th-order vented short-horn hybrid powered subwoofer. Neodymium 21 inch driver with 2500W Class D amplification. 28 to 100 Hz response. Cardioid mode available with multiple cabinets. The Mobile DJ and mid-size production foundation that delivers Makara-class extension from a single-driver footprint.
$4,995 each
Quote includes shipping, system bundles, and current lead time.
Most quotes sent same business day. Real people, no scripts.
Recommended accessories
VS21 Padded Transport Cover (8-handle)
Heavy-duty padded nylon cover for the 8-handle VS21 cabinet. Embroidered BASSBOSS logo. 4 to 6 weeks lead time.
$435cover with logo
WVS21V Vertical Cart
Birch plywood vertical wheel cart with foot pockets to secure the cabinet vertically. 4 locking casters. One cabinet per cart.
$385one cabinet per cart
WVS21H Horizontal Cart
Birch plywood horizontal wheel cart with foot pockets to stack multiple cabinets. 4 locking casters. 635 kg capacity.
$385stack 2-3 per cart
VSLA Ground-Stack Brackets (per MFLA box)
Support bracket kit to mate one MFLA line array element on top of one VS21 in ground-stack configuration. Linking array bracket included.
$916per MFLA-to-VS21 pair
Driver
1×21″neodymium, hybrid loaded
Amplification
2500WClass D with DSP
Response
28Hzto 100 Hz; cardioid capable
Weight
180lb82 kg, mobile dual 21 alternative
What we hear from owners
What VS21‑MK3 owners report after the first 30 days
Patterns from mobile DJs, mid-size production, and rental fleet owners.
01
One person can handle it
At 180 lbs with the WVS21V cart, the VS21 is a single-person load-in even though it puts out at dual-21 levels. Mobile DJs running solo describe this as the unlock that lets them scale up without hiring labor.
02
Makara-class extension from a single cabinet
The 6th-order hybrid alignment delivers 28 Hz extension from a single 21 inch driver. Owners coming from dual 18 mobile subs report the bottom octave opens up immediately on first use.
03
Cardioid mode pays off in 2-cabinet rigs
Mobile DJs and small production crews running 2 VS21 in cardioid clean up the stage and the back wall meaningfully. The DSP handles alignment; no outboard processor required.
04
VSLA ground-stack is the festival deployment
For festivals and venues without fly points, VS21 with VSLA brackets supports MFLA line arrays in ground-stack configuration. This is the default small-festival rig.
05
A pair handles 300 to 700 capacity rooms
Two VS21 under DV12, AT212, or Sublim8 tops handles weddings, corporate, and mid-size club work consistently. Three or four for larger.
06
Resale tracks the dual 21 audience
Used VS21 cabinets move quickly through regional mobile DJ and small production groups. The cabinet has a defined buyer pool that keeps resale tight.
Decision framework
Is the VS21‑MK3 right for you?
Buy it for
Mobile DJs and AV operators scaling up from dual 18 or single 18 mobile subs to a true 21 inch extension. Mid-size production and rental fleets covering 300 to 700 capacity rooms. Festival and event ground-stack deployments with MFLA‑MK3 line arrays (using VSLA brackets). Cardioid arrays for clean stage and back-wall control. Pairing under DV12‑MK3, AT212‑MK3, AT312‑MK3, or Sublim8 tops.
Look elsewhere if
You run festival, nightclub, or large-event work where the Makara‑MK3 dual 21 production foundation is the scale that fits. You need ultra-low EDM extension below 25 Hz, where the ZV28‑MK3 is the answer. You need the smallest possible mobile sub for intimate rooms, where the BB15‑MK3 or DJ18S‑MK3 cover the application at a lower weight.
Get a real quote
Send a system spec, not a price shopping number
Tell us the room, the audience size, and what you run today. We come back with the right pair, freight, and price. One short form.
Different jobs. The VS21‑MK3 is the single 21 mobile sub for 300 to 700 capacity rooms and mobile DJ work where one person needs to load it. The Makara‑MK3 is the production dual 21 for festival and club work at sustained output. Same neodymium 21 inch driver platform; the VS21 is built for mobility, the Makara for fixed production.
Q2
VS21 versus DJ18S, which one do I want?
DJ18S‑MK3 is the single 18 mobile DJ standard for intimate rooms. VS21 is the step up: real 21 inch driver, 28 Hz extension, cardioid capable, and pairs with line arrays for festival deployment. Choose DJ18S for under-200 cap mobile work; VS21 when the room and the bottom-octave demands step up.
Q3
Can I use VS21 to ground stack an MFLA line array?
Yes. The VSLA bracket kit ($916 per MFLA-to-VS21 pair) mates one MFLA element to one VS21 in ground-stack configuration. This is what we ship most small-festival deployment without fly points.
Q4
How does cardioid mode work on VS21?
Cardioid mode is preset-driven via the onboard 96kHz DSP. A minimum of 2 cabinets per array; 3 or 4 for stronger rejection. No outboard processor required.
Q5
What tops pair with VS21?
DV12‑MK3 and Sublim8 for mobile DJ work, AT212‑MK3 for outdoor mains, AT312‑MK3 for reference install, MFLA‑MK3 for festival line array deployment.
Q6
How many VS21 for a 500 person event?
Two VS21 cover most 500 cap rooms with appropriate tops. For dance-heavy programming, three or four. For 700 plus, consider stepping up to Makara dual 21 production subs.
System design
This pairs well with
VS21 is the bridge between mobile DJ subs and production dual 21. The top defines the application.
VS21 + VSLA brackets ground-stacks MFLA line arrays for festivals and venues without fly points. Standard small-festival deployment.
Field video
VS21‑MK3 in the wild
Owner reviews and field recordings.
VS21-MK3 versus Makara-MK3 comparison
VS21-MK3 in deployment
VS21-MK3 field review
Honest answers
Doubts our clients initially had
Before they bought, here is what made buyers hesitate. We talked it through. Short version.
D1
A single 21 versus dual 18, what is really the difference?
Cone area is comparable, but a single 21 driver in a 6th-order hybrid enclosure delivers lower extension (28 Hz) and tighter transient response than most dual 18 mobile subs. The single-driver topology also eliminates the phase issues two drivers in one cabinet introduce.
D2
180 pounds is still heavy for "mobile."
It is. The WVS21V vertical cart is the standard transport solution: foot pockets to secure the cabinet, 4 locking casters, one-person handling. For solo operators, the cart is not optional, it is part of the system.
D3
Cardioid mode is a marketing term.
Until you stand behind a 2-cabinet VS21 cardioid array at full output. The rear-rejection cleans up the stage and the back of the room in a way that matters for vocal intelligibility and neighbor complaints. The DSP handles it automatically.
D4
Why pay more than the SSP118 or DJ18S?
Different cabinet, different job. The 21 inch driver and the 6th-order hybrid alignment deliver lower extension and more output per cabinet than any single 18 sub. For rooms where the SSP118 is working hard, the VS21 is comfortable.
D5
I want to hear one before buying.
VS21 owner density is high in TX, CA, FL, and emerging in the Northeast. Send your city and the application; we can often route an introduction to a current owner running similar work.
