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Message: <blockquote data-quote="quackhead" data-source="post: 7810340" data-attributes="member: 573547"><p>LOL..now you mention Passives and the guys say WTH?  These guys are getting phenomenal numbers with high power single 12" setups (example) and tuning of the ports/placement of the ports/type of port all comes into play. It is not uncommon to see just everyday groundpounders with a couple of 12" subs and 2,000 watts of power feeding them producing mid 140's or better in spl. Class D is a boon in efficiency...A/B was what? High 60's pecentage wise in efficiency with a good amp at 4 ohms? The cheaper Class D's now days can get close to 80% efficiency at 1ohm loads....so yeah, i eat my words, times have changed a lot.</p></blockquote><p></p>

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