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FLEX 928A

Active Dual 18" Subwoofer

138dB Max SPL
30Hz – 400Hz Frequency response
2×18” Hyper Vented Woofer
4.0″ voice coil
DSP-controlled Input section
6 selectable presets (e.g. cardioid)
5600 Watt Peak, 2800 Watt RMS
Class-D Amplifier
Multiple configurations
105 kg / 231.5 lbs Weight
Baltic Birch Cabinet

138dB Max SPL

Rated at 138dB, Flex 928A is incredibly powerful, exceeding the sound levels of many everyday situations like rock concerts or even loud machinery. It’s designed for professional applications like concerts, stadiums, and large events, capable of producing very loud and impactful sound.

Class D Amplifier

Clean, high-efficiency, and compact amplification.

FLEX 928A is one of the most powerful 2×18″ subwoofers in the pro-sound category. FLEX 928A can perform in the most demanding situations. The input board includes volume control, ground switch, preset switch, cover, end fire, an inverted stack.

Multiple Configurations

FLEX 928A

Optimize the sound system’s performance for different configurations, venues, and acoustic goals

Flexibility: You can tailor the system for indoor/outdoor use, audience size, stage placement, etc.
Improved Sound Quality: Better frequency response and coverage patterns.
Efficiency: More controlled energy dispersion, reducing wasted power and avoiding noise complaints.

Low-Pass Filter (LPF) Presets

(1–4: 80Hz to 120Hz)

These control the upper frequency limit that the subwoofers output:

Lower LPF (e.g., 80Hz) Useful for systems with larger main speakers that handle more low-end, reducing overlap and potential phase issues.
Higher LPF (e.g., 120Hz) Useful when the main speakers smaller and need the subs to cover more of the low-mid range.
Helps in achieving better crossover integration between subs and tops.

Preset 5: End Fire

1.2M

A subwoofer array configuration designed to increase forward sound projection and reduce rearward energy (cardioid effect).
Used to minimize low-frequency spill on stage or behind the array—beneficial in live sound setups.