PASpeaker-Base

Subwoofers

Horn subwoofers

A flaring sound channel couples the diaphragm to the air. Very high efficiency, but large dimensions at low frequencies; bass horns are usually folded.

How horn works
Folded bass horn in cross-section Side section: the driver works from a compression chamber at the top right onto the horn throat. The horn path runs to the left, is folded through 180 degrees at the enclosure wall and leads back to the right to the horn mouth. Its cross-section increases from throat to mouth. Compression chamber Horn throat Fold Horn path Horn mouth largest cross-section
Schematic section through a horn enclosure. The drawing shows the principle, not the dimensions of a specific build plan.

Plans

Link to section “Plans”
  • 18″ Horn Partially verified

    18 Sound 18H

    A folded bass horn for an 18-inch driver. 18 Sound names three suitable drivers and supplies complete controller settings for two of them.

    Dimensions (H × W × D)
    815 × 590 × 820 mm
  • 18″ Horn Partially verified

    B&C S18H

    An 18-inch bass horn made from 18 mm board. The document consists of drawings; no specifications are given in the text.

    No performance data published

  • 18″ Horn Partially verified

    Precision Devices PD-H118A

    An 18-inch bass horn with three drivers named by the manufacturer. The datasheets for all three options are in the plan.

    No performance data published

  • 18″ Horn Partially verified

    Speakerplans 1850 Horn

    A folded bass horn for an 18-inch driver with high efficiency. Four drawings contain dimensions, angles, mitres and panel lengths.

    Low-frequency extension
    50 Hz
    Sensitivity
    105 dB
    Dimensions (H × W × D)
    956 × 636 × 750 mm
  • 18″ Horn Partially verified

    Speakerplans 186 Horn

    A folded bass horn for an 18-inch driver with an emphasis on clean sound. The two views give different heights.

    Low-frequency extension
    51 Hz (-3 dB)
    Dimensions (H × W × D)
    – × 600 × 750 mm (incomplete)
  • 15″ Horn Partially verified

    Speakerplans HD 15 Horn

    A compact 15-inch horn for the 52 to 180 Hz range. It does not replace a subwoofer and according to the designer is intended for large stacks.

    Low-frequency extension
    52 Hz
    Dimensions (H × W × D)
    578 × 472 × 578 mm