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<blockquote data-quote="SHO&amp;#039;NUFF" data-source="post: 8832916" data-attributes="member: 688375">YesYesNo, you can add blocks of wood or something to take up space inside the box as well. You can also face the subwoofer backwards, meaning basket and motor on the outside to increase the volume inside the box. As long as the subwoofer has a vented pole piece there will be no difference in performance.Yes, for more reasons than just the mass difference between the speakers.No, you can build a box that will get loudest your speaker is capable of, but you won&#039;t like the way it sounds. SPL boxes typically have a huge spike in response at the natural resonant frequency of your car. You probably want to tune low 30&#039;s for music.Yes, decreased output, the speaker moves a lot more because there&#039;s less pressure helping control the speaker. There&#039;s more pressure in a ported box than a sealed box at the tuning frequency. There will be popping sounds of the voicecoil hitting the backplate if it goes too low with too much power.NoPartsExpress has books on building boxes. My favorite is the loudspeaker design cookbook.</blockquote>

[QUOTE="SHO'NUFF, post: 8832916, member: 688375"] Yes Yes No, you can add blocks of wood or something to take up space inside the box as well. You can also face the subwoofer backwards, meaning basket and motor on the outside to increase the volume inside the box. As long as the subwoofer has a vented pole piece there will be no difference in performance. Yes, for more reasons than just the mass difference between the speakers. [I]No, you can build a box that will get loudest your speaker is capable of, but you won't like the way it sounds. SPL boxes typically have a huge spike in response at the natural resonant frequency of your car. You probably want to tune low 30's for music.[/I] Yes, decreased output, the speaker moves a lot more because there's less pressure helping control the speaker. There's more pressure in a ported box than a sealed box at the tuning frequency. There will be popping sounds of the voicecoil hitting the backplate if it goes too low with too much power. [I]No[/I] PartsExpress has books on building boxes. My favorite is the loudspeaker design cookbook. [/QUOTE]

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