Bass Reflex Alignments: Compliance Alteration

After discussing computation of discrete alignments such as B4, BL4, LR4, IB4, and CD4, this new article in the "Computation of Bass Reflex Alignments" article series explores the real-world situation where it becomes impossible to have a system design that exactly matches a certain driver Qt, normally described as an alignment error (or misalignment). The technique presented allows designers to modify tuning towards a desired target response function.

In the fourth article from Claus Futtrup in his series about the invention, concept, and historical perspective of loudspeaker bass reflex alignments, he explores the Critically Damped Fourth-Order (CD4) bass reflex alignment. This alignment remains one of the least known and hasn't been discussed in literature related to loudspeaker design, even though it allows for interesting output properties. This article was originally published in Voice Coil, August 2024.

The new Genelec 1237A and 1238A Smart Active Monitors (SAM) are tri-amplified systems featuring AutoCal and GLM technologies and powerful Class D amplification. The 1237A and 1238A monitors feature on-board intelligence to automatically tune the frequency response to compensate for acoustical room influences, as well as achieving perfect alignment of levels and distance compensation at the listening position.