Enclosure Type: Band Pass
Driver Alignment: Subwoofer
Bass Type: Subwoofer
Crossover Type: DSP
Impedance: 8 Ohm
Sensitivity: 99 dB
Cutoff -3 dB: 30 Hz
Diaphragm Material: Paper
Build Complexity: Novice
Radiation Type: Monopole
Type of Use: Public Address
Placement: Outside
Bass Driver Size: 21 inch
Cost of Parts: $1030

folded, double 21” band-pass subwoofer kit


Driver Choices

You may choose one of the following 3 drivers:

21LW1400 - For cost effective solution
- Ceramic magnet
- 4” interleaved sandwich voice coil (ISV)
- Double silicon spider (DSS)
- Double demodulating rings (DDR)
- 1500W AES power handling

21NLW9000 - For high power handling and lightweight box
- Neodymium magnet
- 5.3” interleaved sanwitch voice coil (ISV)
- Triple silicon spider (TSS)
- 1800W AES power handling

21NLW9600 - Highest efficiency, increased motor-strength and maximum impact
- Similar mechanic characteristics like 21NLW9000 model but with augmented strength magnet for an outstanding 43.5! Bl factor

The Enclosure

  • The enclosure should be made of baltic birch plywood (18mm thickness)
  • Bolts are M6x35mm
  • M6 T-Nuts are recommended
  • Handling, rigging and connectors are user’s choice
  • It’s recommended to damp the cabinet interior well
  • A damping example can be viewed in the images
  • A high density dampening material, such as Dacron or other synthetic fibers, is required for better performance
Internal View
Exploded View
Front View
Rear View
Top Section
Rear Section
Side Section
Details: Part D and F
Eighteen Sound is a leading designer and manufacturer of high quality professional audio loudspeakers, developing state-of-the-art transducer technologies and using the most advanced production techniques, located in Reggio Emilia, Italy.
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