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Message: <blockquote data-quote="Tzs503gp" data-source="post: 1191655" data-attributes="member: 19443">It’s a general misconception. You can use any QTS in a sealed box. You cannot (shouldn’t <img class="smilie smilie--emoji" loading="lazy" alt="🤷‍♀️" title="🤷‍♀️" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f937-2640.png" />) use higher QTS (circa 0.5plus) in a ported box.QTS less than 0.4 has a stiff suspension. Putting such a driver in a sealed box only makes it better damped, and harder to drive depending on box volume.As the QTS spec gets higher, suspension gets softer. You shouldn’t use a QTS 0.6 driver in a ported box because the open box cannot damp the driver effectively. A low QTS driver has a stiff suspension and doesn’t need an air cushion behind it to damp the driver, thus making it suitable for ported use, but doesn’t make it unsuitable for sealed application.</blockquote>