186FIND

ENCLOSURE RECOMMENDATIONS: 186FINDX8-552A
Driver: 186FINDX8-552A (186FIND) — 18" Woofer
Key T/S: Fs=33.0Hz, Qts=0.35, Vas=174.2L, Sens=96.0dB
Power: AES 1800W / Cont 3600W / Peak 7200W
Xmax=8.40mm, Sd=1256.0cm², Bl=30.2T·m
RECOMMENDED ENCLOSURE TYPE: Bass Reflex (Vented)
PORT RECOMMENDATION: Slot port (full-width or L-shaped internal duct) — provides large cross-sectional area needed for high air displacement; reduces port noise at high SPL
  a) High SPL
     Net Volume: 135 liters
     Tuning (Fb): 37 Hz
     Est. -3dB: 34 Hz
     HP Filter: 29 Hz (24dB/oct recommended)
     Round Port: 125mm dia × 99mm long
     Slot Port: 338mm W × 75mm H × 263mm L
     Port Velocity: 20.2 m/s
     Notes: Strong mid-bass impact, reduced cone excursion, maximum output
  b) Balanced Response
     Net Volume: 160 liters
     Tuning (Fb): 33 Hz
     Est. -3dB: 30 Hz
     HP Filter: 23 Hz (24dB/oct recommended)
     Round Port: 125mm dia × 120mm long
     Slot Port: 338mm W × 75mm H × 305mm L
     Port Velocity: 17.7 m/s
     Notes: General-purpose PA/subwoofer, even response, good transient behavior
  c) Extended Low Frequency
     Net Volume: 190 liters
     Tuning (Fb): 29 Hz
     Est. -3dB: 25 Hz
     HP Filter: 20 Hz (24dB/oct recommended)
     Round Port: 125mm dia × 144mm long
     Slot Port: 338mm W × 75mm H × 356mm L
     Port Velocity: 15.4 m/s
     Notes: Deep bass extension, requires proper system protection below tuning
--- Summary ---
The 186FINDX8-552A is a 18-inch high-output woofer driver designed for professional subwoofer systems requiring high sensitivity (96 dB 1W/1m) and controlled low-frequency behavior. The motor and suspension are optimized to maintain consistent performance at high drive levels, with controlled excursion and reduced thermal compression during long-term operation.
In bass reflex enclosures, the driver performs best in net internal volumes of 135 to 190 liters, tuned between 29 and 37 Hz. This alignment provides a balanced combination of low-frequency extension, cone control around resonance, and efficient port loading. Lower tuning improves deep bass extension but increases excursion below tuning, requiring appropriate high-pass filtering. Higher tuning increases sensitivity and output in the upper bass region while improving mechanical control.
The driver is intended for use with high-power amplification (approx. 1800 W AES / 3600 W continuous) and DSP control. A high-pass filter in the range of 20–29 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 25–100 Hz, making it suitable for integration with mid-bass or full-range systems.