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<blockquote data-quote="Papermaker85" data-source="post: 8466901" data-attributes="member: 572595">why not do 6 12s ported? 4th order only uses one wave. if your gonna go through all that trouble why not and transmission line or a wave guide?the higher the ratio the peakier the woofers will be like varying the ports surface area and loading the port by using a much less internal airspace. your basically compound loading the driver(a similar effect as bandpasss which IS compound loading) and using the port to increase displacement. the biggest thing with a ported box is getting the rear wave correct. wish i still had pics of the wave guide i done for my dad. although you can never get all the the bandwidths frequencies in perfect phase its still much more efficient that a typical ported box thats typically 5-60 degrees out of phase.. im not saying they **** or they aren&#039;t good i just think its such waste use just the front wave when a good driver can be ported and using the 1/4 length waveform wave guild gives you HUGE efficiency gains.</blockquote>

[QUOTE="Papermaker85, post: 8466901, member: 572595"] why not do 6 12s ported? 4th order only uses one wave. if your gonna go through all that trouble why not and transmission line or a wave guide? the higher the ratio the peakier the woofers will be like varying the ports surface area and loading the port by using a much less internal airspace. your basically compound loading the driver(a similar effect as bandpasss which IS compound loading) and using the port to increase displacement. the biggest thing with a ported box is getting the rear wave correct. wish i still had pics of the wave guide i done for my dad. although you can never get all the the bandwidths frequencies in perfect phase its still much more efficient that a typical ported box thats typically 5-60 degrees out of phase.. im not saying they **** or they aren't good i just think its such waste use just the front wave when a good driver can be ported and using the 1/4 length waveform wave guild gives you HUGE efficiency gains. [/QUOTE]

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