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<blockquote data-quote="bladebarrier" data-source="post: 6204689" data-attributes="member: 603808">As said prior, apples to oranges, but let&#039;s pretend it&#039;s apples to apples for a second.Your theory on +3 db for a ported is correct in a sense. Your theory that two sealed subs would also create +3 db due to cone size is also correct. Then power handling could also be doubled.Here&#039;s where it breaks down into real world application:A ported sub designed for spl will out do two sealed subs, because your port tuning can be adjusted much higher than if you tuned for SQ. You can achieve peaks that are far higher with a ported box than the theoretical +3db a port implies. Bandpasses are even better at it, but they tend to be very large, and far more complicated a design, so we&#039;ll leave those out for now.The second thing to consider, is can your alternator really put out the juice you think it can? When you start going above 2k watts, you really need to consider that voltage drop may actually be making your amps run much lower than you think they are.Basically, for spl, ported &amp;gt; 2xsealed, assuming you want peak resonances.If you want overall smooth frequency output at the lowest hz (30 and below), then 2 sealed with adequate power supplied by a proper alternator, will out do a ported. Honestly, there&#039;s very little real music that exists below 30hz, and you can still achieve good results down to 25-30hz with a low tuned ported box, using less current, and outperform the sealed.Of course, if you&#039;re looking for pure SQ, go sealed.If you want output, try modifying your port tuning or box size, and stick with a ported enclosure. You could also try a single Fi BTL instead, or similar sub, which is more designed for output than the Q&#039;s are.Also, you&#039;d have twice the budget for your 15 if you only buy one, so you can get the best single driver for you money instead of two lesser ones.--Just my thoughts</blockquote>

[QUOTE="bladebarrier, post: 6204689, member: 603808"] As said prior, apples to oranges, but let's pretend it's apples to apples for a second. Your theory on +3 db for a ported is correct in a sense. Your theory that two sealed subs would also create +3 db due to cone size is also correct. Then power handling could also be doubled. Here's where it breaks down into real world application: A ported sub designed for spl will out do two sealed subs, because your port tuning can be adjusted much higher than if you tuned for SQ. You can achieve peaks that are far higher with a ported box than the theoretical +3db a port implies. Bandpasses are even better at it, but they tend to be very large, and far more complicated a design, so we'll leave those out for now. The second thing to consider, is can your alternator really put out the juice you think it can? When you start going above 2k watts, you really need to consider that voltage drop may actually be making your amps run much lower than you think they are. Basically, for spl, ported > 2xsealed, assuming you want peak resonances. If you want overall smooth frequency output at the lowest hz (30 and below), then 2 sealed with adequate power supplied by a proper alternator, will out do a ported. Honestly, there's very little real music that exists below 30hz, and you can still achieve good results down to 25-30hz with a low tuned ported box, using less current, and outperform the sealed. Of course, if you're looking for pure SQ, go sealed. If you want output, try modifying your port tuning or box size, and stick with a ported enclosure. You could also try a single Fi BTL instead, or similar sub, which is more designed for output than the Q's are. Also, you'd have twice the budget for your 15 if you only buy one, so you can get the best single driver for you money instead of two lesser ones. --Just my thoughts [/QUOTE]

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