Theory Professional, the professional division of Theory Audio Design, is making a serious first impression at ISE 2026 with its all-new SR Series — a family of premium passive and powered loudspeakers engineered for sound reinforcement with performance and fidelity that rivals much larger systems. At the heart of the lineup is the SR-221.3, a truly unique full-range loudspeaker that pushes the envelope of output, bandwidth, and coverage.
The SR-221.3 pairs dual 21-inch, 3,600 W low-frequency drivers with four 10-inch high-output carbon fiber midrange drivers and a 5-inch wide-band ring radiator compression driver. The result: an astonishing 27 Hz – 20 kHz (-3 dB) frequency response, up to ~140 dB SPL, and an ultra-wide 170° × 60° coverage pattern. One to two SR-221.3s can easily fill medium venues with high-fidelity, high-impact sound.
Theory Professional has designed the SR Series to deliver lively dynamics, refined acoustic accuracy, and sheer output capability, all in surprisingly compact cabinets that won’t dominate aesthetic spaces; whether installed or used portably. The series includes eight models; passive, active, portable, and install variants — all built-to-order and available in black or white. Optional upgrades include custom paint matching and weatherizing on passive units.
Thoughtful details throughout the SR Series — from ergonomic handles and multiple fly points to industry-standard mount points, pole cups, and a suite of accessories like the Theory SplitYoke multipurpose mounting brackets, caster kits, and a dolly board — make these systems as flexible as they are powerful. Q2 2026 delivery is planned for powered, passive, portable, and install versions.
SR Series Loudspeakers and Subwoofers: Eight High-Output Models Now Available from Theory Professional
At ISE 2026, Theory Professional is demonstrating the new SR Series in Hall 8.0, Audio Demo Room D4, giving attendees a chance to hear exactly how far the company is pushing premium sound reinforcement. Demonstrations can be scheduled in advance, or you can stop by D4 to experience the system in action. More details are available at theoryprofessional.com.
Below is a clear breakdown of the eight SR Series loudspeakers and subwoofers available to order now, covering configuration, intended use, and key options.
SR Series Loudspeakers
SR-46.2
- Quad 6-inch, 2-way multi-use loudspeaker
- Ultra-slender, tall-but-narrow enclosure with 120° conical coverage
- Available in passive and powered versions
- Included features:
- Integral pole cups
- Ergonomic handles
- Fly points and industry-standard mount points
- Optional:
- Theory SplitYoke Multipurpose Mounting Bracket Kit for horizontal or vertical surface mounting
SR-28.2
- Dual 8-inch, 2-way multi-use loudspeaker
- 80° × 60° elliptical horn
- Available in passive and powered versions
- Included features:
- Integral pole cups
- Ergonomic handles
- Fly points and industry-standard mount points
- Optional:
- Theory SplitYoke Multipurpose Mounting Bracket Kit for horizontal or vertical surface mounting
SR-112.2
- Single 12-inch, 2-way multi-use loudspeaker
- 80° × 60° elliptical horn
- Available in passive and powered versions
- Included features:
- Integral pole cups
- Ergonomic handles
- Fly points and industry-standard mount points
- Optional:
- Theory SplitYoke Multipurpose Mounting Bracket Kit for horizontal or vertical surface mounting
SR-212.2
- Full-range, multi-use loudspeaker with integrated subwoofer
- Dual 12-inch LF drivers and dual 8-inch mid drivers in a 3-way design
- Exceptionally compact enclosure at just 10 inches deep
- Available in passive and powered versions
- Included features:
- Integral pole cups
- Ergonomic handles
- Fly points
- Optional:
- Theory SplitYoke Multipurpose Mounting Bracket Kit
- Theory Caster Kit for portable applications
SR Series Subwoofers
SR-212LF
- Compact, high-output bass-reflex subwoofer
- Dual 12-inch, 1,400 W woofers
- Sonically matched to SR-46.2, SR-28.2, and SR-112.2
- Included features:
- Removable feet
- Integral pole cups
- Ergonomic handles
- Fly points
- Optional:
- Theory SplitYoke Multipurpose Mounting Bracket Kit
- Theory Caster Kit
SR-215LF
- Maximum-output, manifold bass-reflex subwoofer
- Dual 15-inch, 3,600 W woofers
- Sonically matched to SR-46.2, SR-28.2, and SR-112.2
- Included features:
- Removable feet
- Integral pole cups
- Ergonomic handles
- Fly points
- Optional:
- Theory Quick-Release or Standard Caster Kits
- Dolly Board for transport
SR-218LF
- Maximum-output, manifold bass-reflex subwoofer
- Dual 18-inch, 3,600 W woofers
- Sonically matched to SR-46.2, SR-28.2, and SR-112.2
- Included features:
- Removable feet
- Integral pole cups
- Ergonomic handles
- Fly points
- Optional:
- Theory Quick-Release or Standard Caster Kits
- Dolly Board for transport
SR-221LF
- Extreme-output, manifold bass-reflex subwoofer
- Dual 21-inch, 3,600 W woofers
- Sonically matched to SR-46.2, SR-28.2, and SR-112.2
- Included features:
- Removable feet
- Integral pole cups
- Ergonomic handles
- Fly points
- Optional:
- Theory Quick-Release or Standard Caster Kits
- Dolly Board for transport
The Bottom Line
The SR-221.3 is still very much a proof of concept, and pricing has not been finalized. What is clear is that it will sit above Theory Professional’s existing SR models once it moves toward production. This is a true full-range loudspeaker loaded with expensive hardware — dual 21-inch, 3,600-watt low-frequency drivers, four 10-inch carbon-fiber midrange drivers, and a 5-inch wide-band ring-radiator compression driver — and there’s no scenario where that bill of materials leads to an “affordable” outcome.
With 27 Hz–20 kHz bandwidth (-3 dB), approximately 140 dB SPL, and 170° × 60° coverage, the SR-221.3 is designed to deliver high-output, high-fidelity sound at scale, with just one or two cabinets capable of filling medium-sized venues. Based on the pricing of Theory Professional’s current pro models, expect the SR-221.3 to land firmly in premium territory when it eventually reaches market — because nothing about this design suggests it’s meant to play in the shallow end.
For more information: theoryprofessional.com
Related Reading:
- Theory Audio Design Ic5 In-Ceiling Speaker Lands At CEDIA 2025: Compact Design, Massive Attitude
- Theory Audio Design Launches PLC Series Loudspeaker Controllers At CEDIA 2025 With New 8-Channel And 4-Channel Models
- Pro Audio Technology Turns Up The Heat With Performance Upgrades Across Multiple Speaker Models
- Pro Audio Technology Celebrates Its 20th Anniversary With 5 New Models: CEDIA 2024
