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<blockquote data-quote="adio" data-source="post: 1318840" data-attributes="member: 563568">like this:<img src="http://www.hometheaterhifi.com/volume_11_3/images/svs-pb2-ultra-subwoofer-rear-panel.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />In addition, there is a subsonic filter knob, with settings of 25 Hz, 20 Hz, 16 Hz, and bypass. These are used with port blocking foam plugs to allow customizing the sub to suit your taste and room. 25 Hz with no plugs will yield the highest overall SPL, while a 16 Hz setting with two plugs will give you some serious bottom trolling extension. It should be noted that in room, at each of the settings, plenty of bass was still apparent below the filter point.andTuning Options:The PB2-Ultra is a bass reflex design, and venting is accomplished with three widely flared 4&quot; rear discharge ports. The rated tune point with three ports open is 25 Hz, and lower states of tune can be achieved by plugging one port (20 Hz) or two ports (16 Hz), and adjusting the tune switch accordingly.<img src="http://www.hometheaterhifi.com/volume_11_3/images/svs-pb2-ultra-subwoofer-rear-panel-closeup.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />1.)&nbsp;&nbsp; if i were to make one of these boxes, do i really need to have those subsonic filters&nbsp; when i change the tuning??2.) has ANYONE attempted to make these types of enclosures or enclosures with switchable tuning in general??3.)&nbsp; is there ever such a thing as &#039;too big&#039; for a sealed box for HT if i plug up all the ports???</blockquote>

[QUOTE="adio, post: 1318840, member: 563568"] like this: [IMG]http://www.hometheaterhifi.com/volume_11_3/images/svs-pb2-ultra-subwoofer-rear-panel.jpg[/IMG] In addition, there is a subsonic filter knob, with settings of 25 Hz, 20 Hz, 16 Hz, and bypass. These are used with port blocking foam plugs to allow customizing the sub to suit your taste and room. 25 Hz with no plugs will yield the highest overall SPL, while a 16 Hz setting with two plugs will give you some serious bottom trolling extension. It should be noted that in room, at each of the settings, plenty of bass was still apparent below the filter point. [SIZE=24px][B]and[/B][/SIZE] Tuning Options: The PB2-Ultra is a bass reflex design, and venting is accomplished with three widely flared 4" rear discharge ports. The rated tune point with three ports open is 25 Hz, and lower states of tune can be achieved by plugging one port (20 Hz) or two ports (16 Hz), and adjusting the tune switch accordingly. [IMG]http://www.hometheaterhifi.com/volume_11_3/images/svs-pb2-ultra-subwoofer-rear-panel-closeup.jpg[/IMG] 1.) if i were to make one of these boxes, do i really need to have those subsonic filters when i change the tuning?? 2.) has ANYONE attempted to make these types of enclosures or enclosures with switchable tuning in general?? 3.) is there ever such a thing as 'too big' for a sealed box for HT if i plug up all the ports??? [/QUOTE]

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