Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
Maybe measure the box and the port? Open it up and check for items inside that will displace internal volume too. You'll want to offset the displaced volume for any internal components, like for the woofer, midrange, tweeter and crossover. You can measure box dimensions and calculate volume, then knowing port size you'll know what the Helmholtz frequency is. Check those things and write back here.