Rebellion 15 D1 – 4,000W RMS 15" SQ/SPL Subwoofer Join the Rebellion. Built to achieve a high level of SQ/SPL, the Rebellion 15 D1 delivers extreme output without sacrificing musicality. A low 27Hz Fs and 498 oz motor provide deep, controlled bass across a wide range of music. Whether you’re chasing numbers or want daily-driver bass at EXTREME levels, the Rebellion is a great choice. #WeDontStop Key Highlights Power: 4,000W RMS (competition-ready headroom) Impedance: Dual 1Ω (D1) – flexible wiring options Voice Coil: 4" high-temp D1 Motor: 498 oz for strong motor force and control Low Fs: 27Hz for deep, musical extension Xmax: 25mm one-way for clean, high-level output Thiele–Small Parameters Fs 27 Hz Qes 0.591 Qms 7.124 Qts 0.546 Sd 730.62 cm² Sensitivity (SPL) 87 dB Re 1 + 1 Ω (dual coils) BL 28.471 Tm Xmax (one-way) 25 mm Motor 498 oz Voice Coil 4" D1 Power Rating 4,000W RMS Wiring Options (Dual 1Ω) Parallel: 0.5Ω (requires half-ohm-stable amplifier) Series: 2Ω (broader amp compatibility) You may interested in: Audio Ace Rebellion 18" Subwoofer Ideal Boxes Daily musical: Ported enclosure tuned in the low–mid 30s Hz for a balance of SQ and output. SPL/demo: Larger net volume with tuning in the upper 20s–low 30s to leverage the low Fs.