183FIND

ENCLOSURE RECOMMENDATIONS: 183FINDX8-297
Driver: 183FINDX8-297 (183FIND) — 18" Mid-Woofer
Key T/S: Fs=32.0Hz, Qts=0.42, Vas=329.5L, Sens=97.07dB
Power: AES 600W / Cont 1200W / Peak 2400W
Xmax=5.90mm, Sd=1225.4cm², Bl=21.14T·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: 215 liters
     Tuning (Fb): 37 Hz
     Est. -3dB: 34 Hz
     HP Filter: 29 Hz (24dB/oct recommended)
     Round Port: 125mm dia × 35mm long
     Slot Port: 338mm W × 75mm H × 130mm L
     Port Velocity: 13.6 m/s
     Notes: Strong mid-bass impact, reduced cone excursion, maximum output
  b) Balanced Response
     Net Volume: 250 liters
     Tuning (Fb): 34 Hz
     Est. -3dB: 31 Hz
     HP Filter: 24 Hz (24dB/oct recommended)
     Round Port: 125mm dia × 38mm long
     Slot Port: 338mm W × 75mm H × 136mm L
     Port Velocity: 12.4 m/s
     Notes: General-purpose PA/subwoofer, even response, good transient behavior
  c) Extended Low Frequency
     Net Volume: 275 liters
     Tuning (Fb): 30 Hz
     Est. -3dB: 26 Hz
     HP Filter: 20 Hz (24dB/oct recommended)
     Round Port: 125mm dia × 52mm long
     Slot Port: 338mm W × 75mm H × 166mm L
     Port Velocity: 11.3 m/s
     Notes: Deep bass extension, requires proper system protection below tuning
--- Summary ---
The 183FINDX8-297 is a 18-inch high-output mid-woofer driver designed for professional 2-way and multi-way systems requiring high sensitivity (97 dB 1W/1m) and controlled low-frequency behavior. The driver uses a balanced motor-suspension design that provides good cone control while maintaining usable output across its operating bandwidth.
In bass reflex enclosures, the driver performs best in net internal volumes of 215 to 275 liters, tuned between 30 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. Note: these enclosures are sizable for a 18-inch driver, a result of the driver's high acoustic compliance (Vas=329.5L). More compact cabinets can be designed — smaller net volumes are achievable with active DSP correction, accepting some reduction in output and sensitivity below the tuning frequency.
The driver is intended for use with high-power amplification (approx. 600 W AES / 1200 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 26–1500 Hz, covering bass through upper-mid frequencies for direct integration with a compression driver or tweeter in a two-way or multi-way system.