135 Hz Midbass Horn

About the 135 Hz Midbass Horn

The Inlow Sound 135 Hz Midbass Horn is a DIY/front-loaded midbass horn design by Inlow Sound. The documented version uses a B&C 8PE21 8-inch professional low-frequency driver and is intended to reproduce roughly the upper-bass and lower-midrange region. The designer reports a nominal 3 dB down point of approximately 135 Hz and about three octaves of useful bandwidth with the single-driver configuration. The horn is described as having a quick, realistic presentation and a smooth predicted SPL response. Inlow Sound also describes an enlarged variant that adds approximately seven inches of length, uses a mouth with internal dimensions of about 21.25 x 21.25 inches, and accommodates four B&C 8PE21 drivers per horn wired in parallel. The page further discusses a modified configuration reaching approximately 80 Hz, but this should not be confused with the baseline 135 Hz design. The available information describes a design/plan and optional construction rather than a conventional mass-produced loudspeaker model.