• Long-excursion, vented-spider 18” in deep-tuned cabinet
  • 15mm Birch with clever bracing brings lightweight yet rigid cabinet construction
  • Double baffle board with flush mount transducer
  • SIS pre-wired for very high damping and further reduced distortion (with ALC)
  • Dedicated protection in combination with SDP modules (with ALC)
  • Durotect™ scratch-resistant coating
  • Stand mount adapter


BF181 The BF181 is a front-loaded subwoofer system, for both permanent and portable applications. Featuring a single 18” long-excursion high-power woofer (with vented double-spider frame), the BF181 delivers high quality, tight and accurate sub-bass response. 

The Signal Integrity Sensing™ pre-wiring ensures complete cable/connector compensation between the BF181 and ALC. Typical applications for the BF181 include sub-bass extension of main sound systems, used in multiples depending on the application and low frequency requirements.

The deep-tuning makes the BF181 an ideal highpower HiFi-reproduction system for classical, acoustical and jazz music, in combination with a VR8 or VR12 (on standmount).

The 4 ohms nominal impedance makes for a good amplifier loading, when used in singles.

For full system performance, the BF181 needs to be driven by an ALC controller-amplifier. Driven by the ALC, the BF181 delivers maximum sound quality and output power with dedicated and inaudible (power and excursion!) protection (SDP circuit).
Dimensional Drawing »

Technical Specifications

Frequency Response
+/- 3 dB 33 Hz – 200 Hz
+/- 10 dB 27 Hz –
Sensitivity (SPL 1W/M) 98 dB
Nominal Impedance 4 ohms
Maximum RMS power 1000 W
Maximum peak power 7000 W
SPL program/peak (nom.) 128dB / 136dB
Dispersion H x V (array) omni

Physical Specifications

System subwoofer, front loaded
Drivers LF 1 x AW18.4 18″ vented
Cross-over frequency 36 Hz recommended
Connectors 2 x Speakon NL4 input / link
Physical dimensions mm
Height 628
Width 596
Depth 712
Weight (approx.) BR181 56.2kg
Weight (approx.) BF181i 48.6kg
Warranty 6 years limited