HK Audio LINEAR SUB 1500 A 15" Active Subwoofer

HK Audio LINEAR SUB 1500 A

The HK Audio LINEAR SUB 1500 A packs 1200W peak amplification and a 15-inch woofer with 3-inch voice coil into a compact 19-inch cube enclosure weighing just 65.7 pounds. This bass-reflex design achieves 132dB peak SPL while extending down to 45Hz (-10dB), providing legitimate low-frequency performance without requiring 18-inch drivers or massive cabinets. The variable crossover (100Hz or 120Hz at 24dB/octave) plus dedicated mid/high outputs make this a true system subwoofer—feed it signal from your mixer, and it powers your tops while handling crossover duties internally. Active protection circuits (undervoltage, thermal, short-circuit, overcurrent, subsonic filter, and peak limiter) protect the driver and amplifier during sustained high-output operation.

As the recommended bass extension for LINEAR 3 and LINEAR 5 mid/high units, the SUB 1500 A integrates seamlessly into existing systems, but it's equally capable supporting ELEMENTS EASY BASE, SMART BASE, and LINE BASE configurations. The compact footprint and moderate weight make single-person transport practical, while the M20 pole mount supports stacking tops directly on the subwoofer for space-efficient setups. At 49Hz (+/-3dB), frequency response covers the fundamental bass range for most musical content, and the bass-reflex tuning focuses on punch and definition rather than excessive boom. The dual XLR combo inputs accept balanced signals, with XLR thru outputs and dedicated mid/high outputs providing flexible signal routing. For mobile DJs, small venue systems, and installations where floor space is limited, the SUB 1500 A delivers serious bass performance without dominating stage real estate. Explore our powered subwoofers for more compact solutions.

1200W Peak Power In Compact Bass-Reflex Design

The 1200W peak Class-D amplifier drives the 15-inch woofer with 3-inch voice coil to 132dB peak SPL in a cabinet measuring just 19.1" on each side. This compact form factor makes transport and positioning manageable in venues where floor space is premium, yet the bass-reflex tuning delivers extension down to 45Hz at -10dB. The enclosure uses 16mm MDF construction with black acrylic enamel finish—durable enough for mobile applications while keeping weight to 65.7 pounds for single-person moves. Active protection circuits monitor voltage, temperature, current draw, and excursion to prevent driver and amplifier damage during sustained operation. The subsonic filter (24dB/octave) removes infrasonic energy that wastes amplifier power, while the peak limiter prevents clipping during transient peaks. This comprehensive protection system means you can push the subwoofer to its output limits without worrying about thermal failure or voice coil damage. 

Variable Crossover With Dedicated Mid/High Outputs

The selectable 100Hz or 120Hz crossover (24dB/octave slope) plus dedicated mid/high outputs transform the SUB 1500 A into a true system subwoofer. Feed it signal from your mixer, and it handles bass frequencies internally while sending high-passed signal to your tops via the mid/high outputs. This eliminates the need for external crossovers or DSP processors in simple PA setups. The 100Hz setting works with larger mid/high cabinets that have extended low-frequency response, while the 120Hz option suits smaller tops with limited bass capability. The steep 24dB/octave slope provides clean separation between subwoofer and tops, minimizing overlap that causes phase cancellation and muddiness. Input sensitivity is adjustable with a center-notched gain control (+4dBu at center position), allowing level matching with various source devices. The dual XLR thru outputs provide unprocessed signal pass-through for daisy-chaining additional subwoofers or feeding other system components.

Universal Compatibility Across HK Audio Systems

Designed as the recommended bass extension for LINEAR 3 and LINEAR 5 mid/high units, the SUB 1500 A also integrates with ELEMENTS EASY BASE, SMART BASE, and LINE BASE systems. This cross-compatibility matters when you're building or expanding PA systems—you're not locked into a single product line or forced to replace existing gear. The M20 pole mount supports stacking mid/high cabinets directly on the subwoofer for compact system footprints in installations where floor space is limited. The 19.1" x 19.1" x 23.4" dimensions fit standard vehicle cargo areas and stage corners without requiring excessive rigging or positioning gymnastics. Two MultiGrip handles support balanced lifting and positioning, making single-person setup practical for mobile DJs and small production companies. The IEC power socket with V-Lock cord retainer prevents accidental disconnection during shows, and the 100-240V universal voltage compatibility eliminates the need for external transformers when traveling internationally.

Highlights

• 1200W peak Class-D amplifier drives 15-inch woofer with 3-inch voice coil to 132dB peak SPL
• Bass-reflex design extends response to 45Hz (-10dB) in compact 65.7-pound enclosure
• Variable crossover (100Hz or 120Hz at 24dB/octave) with dedicated mid/high outputs
• Comprehensive active protection: undervoltage, thermal, short-circuit, overcurrent, subsonic filter, peak limiter
• Compatible with LINEAR 3, LINEAR 5, and ELEMENTS EASY/SMART/LINE BASE systems
• Compact 19.1" cube dimensions with M20 pole mount for space-efficient setups
• Dual XLR combo inputs plus XLR thru and mid/high outputs for flexible signal routing

Technical Specifications

What's in the Box