Box Size and Tuning
Getting high performance from your SoundQubed subwoofers depends largely on the box size and tuning. Without enough air, a subwoofer will “choke” and the performance will suffer noticeably! Tuning your sub enclosure incorrectly can also lead to funky impedance changes (box rise). Changing your amp settings to compensate for a lack of response is a common first step toward accidental subwoofer damage.
The different pieces of an audio system depend on each other to perform well. It’s always best to treat an upgrade to one part of your system as if you were designing a new system. Don’t waste time and money “upgrading” your subwoofers without giving them a good home with the right box size and tuning.
SoundQubed subwoofers in the same series operate with the same motor, spiders, suspension throw, and power handling. Because of these common parts, each sub within a series requires the same airspace, and will have similar response characteristics. The table below lists the volume required for different combinations of subwoofers, as well as the port area and length.
Specifications in the table below are for ported enclosures. Port area refers to the area of the opening in square inches. Measurement of the physical port length is taken down the center of the port, rather than along any of the walls. All volume measurements must account for the displacement of the material used to build the box.
Sealed enclosures (for HDS2 and HDS3 woofers only) require about half the net volume.
All volumes are after vent, and subwoofer displacement (net volume). This chart is for box size and tuning in the 35-40Hz range. Get started building your box now by downloading cut sheets for diy enclosures!