Description

Overview

This is a modeling study, not a build — no wood was harmed. The goal is to choose an enclosure alignment for a 10” driver before committing to a box, by comparing sealed, ported, and bandpass options in WinISD.

The interesting result is always the same: the alignment with the lowest -3 dB point is rarely the one with the best transient behaviour. Group delay and excursion tell the real story.

Findings

  • Sealed: best group delay, gentlest rolloff, least output
  • Ported (32 Hz): most output, watch port velocity at power
  • Bandpass: deceptively low extension but heavy group delay near tuning

Specifications

Driver 10" woofer modeled
Sealed Vb 28 L (Qtc 0.7)
Ported Vb 45 L tuned 32 Hz
Excursion limit ±8 mm Xmax

Build Guide

Enter the driver parameters

20 min

Compare alignments

40 min
  • Watch group delay near tuning — a low -3 dB point is worthless if the bass arrives late and smeared.

Check port velocity and power

30 min

Pick the alignment

Discussion

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