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<blockquote data-quote="Electrodynamic" data-source="post: 7357716" data-attributes="member: 548723">Tapered transmission line enclosures to supplement the acoustical suspension deficit? The OP is asking about porting a driver that should not be ported, let alone advising a transmission line enclosure that will not have the same effect in a vehicle as it does in a home. Same thing as horn loaded enclosures - you&#039;ll get right at the same bandwidth and SPL in a vehicle as you do a listening room with a horn because when it&#039;s installed in a car you&#039;re going from high pressure at the throat to low pressure at the mouth then immediately into a high pressure environment (AKA: a vehicle). It simply will not work.You can&#039;t port the TW5 just like you can&#039;t port the BM mkIII&#039;s. Well, I should say should not instead of can&#039;t because technically you can do whatever you want to do irregardless of what the manufacturer suggests. Flat out, the suspension of the TW5 will not handle a larger enclosure or different type of enclosure while maintaining the power handling that JL specifies within their recommended enclosure sizes. You can plot it in WinISD and it may tell you that it will work ported, but power handling goes down the drain if you try to port it or use it IB...or try to use in any other type or size of an enclosure other than what JL recommends....and on Qtc, use what JL recommends, not what WinISD says to use. You can place the driver in a larger enclosure if you absolutely have to, but power handling will go down substantially. In a car audio environment there is no reason to put the driver in a larger enclosure unless you want an over-exaggerated bottom end and greatly reduced power handling. In a vehicle, hitting your target F3 (it should be in/around the mid 40&#039;s) is the most important aspect. Qtc is valid for home applications, but not so much for cars due to the +12 dB/octave gain you get starting at approximately 45 Hz.</blockquote>

[QUOTE="Electrodynamic, post: 7357716, member: 548723"] Tapered transmission line enclosures to supplement the acoustical suspension deficit? The OP is asking about porting a driver that should not be ported, let alone advising a transmission line enclosure that will not have the same effect in a vehicle as it does in a home. Same thing as horn loaded enclosures - you'll get right at the same bandwidth and SPL in a vehicle as you do a listening room with a horn because when it's installed in a car you're going from high pressure at the throat to low pressure at the mouth then immediately into a high pressure environment (AKA: a vehicle). It simply will not work. You can't port the TW5 just like you can't port the BM mkIII's. Well, I should say [I]should not[/I] instead of can't because technically you can do whatever you want to do irregardless of what the manufacturer suggests. Flat out, the suspension of the TW5 will not handle a larger enclosure or different type of enclosure while maintaining the power handling that JL specifies within their recommended enclosure sizes. You can plot it in WinISD and it may tell you that it will work ported, but power handling goes down the drain if you try to port it or use it IB...or try to use in any other type or size of an enclosure other than what JL recommends. ...and on Qtc, use what JL recommends, not what WinISD says to use. You can place the driver in a larger enclosure if you absolutely have to, but power handling will go down substantially. In a car audio environment there is no reason to put the driver in a larger enclosure unless you want an over-exaggerated bottom end and greatly reduced power handling. In a vehicle, hitting your target F3 (it should be in/around the mid 40's) is the most important aspect. Qtc is valid for home applications, but not so much for cars due to the +12 dB/octave gain you get starting at approximately 45 Hz. [/QUOTE]

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