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<blockquote data-quote="Doxquzme" data-source="post: 8896237" data-attributes="member: 689267">Push-pull and compound (isobaric) are two different things. Many moons ago, I had a pair of M&amp;K 12&quot; low frequency drivers units, face to face using the full size spare tire well (about 1.65 cu ft) of a 1980 Mustang fastback LX 5.0. powered by a RF Punch 500.2, it putout prestigious amounts of bass, blew people away that it did what it did in such a small sealed box. I currently have a bass reflex sub in my home theater setup that I built many moons ago, using dual 15&quot; JBL synthesis 15&#039;s pulled from an acquired sub pulled from a closed cinema in San diego, in a 6 cu ft box tuned to 24hz and though it&#039;s like 25 years old (and soon to be replaced by the same configuration using dual 18&quot; ultimax drive units tuned to 16hz) it puts out and always has. It is essentially 50% more than a single driver in half the box size as one driver would be in twice the size box, but still 50% less than if you had 1 driver each in their own 12 cu ft cabinets.There is a place for their use and if you have the money, they can produce some outstanding output in a very small enclosures. Remember, of course, this was done back when you needed HUGE boxes to get the job done. The JBL&#039;s would normally be in their own 10-12 cu ft box each, now doing almost the same amount of work in a 6 cu ft box. Lots of fun with compound (isobaric)loaded setups - just not that practical anymore as advancements in driver tech&nbsp; have created great drivers that work in some pretty small boxes.</blockquote>

[QUOTE="Doxquzme, post: 8896237, member: 689267"] Push-pull and compound (isobaric) are two different things. Many moons ago, I had a pair of M&K 12" low frequency drivers units, face to face using the full size spare tire well (about 1.65 cu ft) of a 1980 Mustang fastback LX 5.0. powered by a RF Punch 500.2, it putout prestigious amounts of bass, blew people away that it did what it did in such a small sealed box. I currently have a bass reflex sub in my home theater setup that I built many moons ago, using dual 15" JBL synthesis 15's pulled from an acquired sub pulled from a closed cinema in San diego, in a 6 cu ft box tuned to 24hz and though it's like 25 years old (and soon to be replaced by the same configuration using dual 18" ultimax drive units tuned to 16hz) it puts out and always has. It is essentially 50% more than a single driver in half the box size as one driver would be in twice the size box, but still 50% less than if you had 1 driver each in their own 12 cu ft cabinets. There is a place for their use and if you have the money, they can produce some outstanding output in a very small enclosures. Remember, of course, this was done back when you needed HUGE boxes to get the job done. The JBL's would normally be in their own 10-12 cu ft box each, now doing almost the same amount of work in a 6 cu ft box. Lots of fun with compound (isobaric)loaded setups - just not that practical anymore as advancements in driver tech have created great drivers that work in some pretty small boxes. [/QUOTE]

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