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In Reply to: RE: but.... posted by Green Lantern on May 17, 2016 at 20:53:26
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I'm assuming by "gunned" you mean Peter Gunn alias John Kruczek in Pennsylvania. He states that after his mods, the efficiency of gunned Maggies goes up to over 90 db so they should be much easier to drive. I recently got a pair of Gunned MMG's and based on the way they perform, I believe him. I was driving them with ease using a 60 watt Conrad Johnson stereo amp and it sounded great. Then I switched to my CJ Premier 8's mono blocks with 300 Watts each and that really woke them up! Hope you have fun and enjoy the system.
Ask John to provide you with a proper free-field measurement that shows nominal 90db sensitivity over the full range of the speaker.Dave.
Edits: 05/18/16
I don't know that he gets the full 90 db sensitivity but his XO is not spaced by an octave like the original so can produce more midrange energy, and the bracing bumps up the bass output - particularly reduces bass compression.
I measured 2-3 db difference going from the passive TIV XO to passive line level 1st order symmetrical measured at 100hz or so.
I explained the technical aspects of his claim years back on this forum.
Switching from a passive speaker-level crossover to a line-level crossover is a completely different topic.
Dave.
IIRC I think the PG XO lets the bass panel operate significantly higher up - by an octave or so and at 1st order Which is why I think he gets higher output at the same power in the midrange.
It doesn't help that Magnepan specifies the baseline sensitivity of their speakers with a 2 watt input at a single frequency. (Much confusion and incorrect relative comparisons result.)
I explained all of this and the Magnestand crossover "re-alignment" configuration years ago.
You do remember, yes? :)
Dave.
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