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In Reply to: MMG OWNERS ,PREPARE TO BE AMAZED : APOGEE CALIPER CROSSOVER ADAPTED TO MMG posted by Jacques T on March 9, 2007 at 22:28:52:
Here a quote from Northcreek audio ,from the similar apogee stage crossover :Comments on the original design:
One thing about Apogee was that we were very particular about crossover component selection, and we selected only by ear. Apogee at the time of the Stage's production was quite possibly the only manufacturer in the world using 12 AWG inductors in their woofer circuits, and in fact 12 AWG inductors were not available on the world market until several years later. Likewise, the Sprague and ASC capacitors were chosen by ear simply because they sounded better than any other capacitors available in their day, and still sound better than the great majority of metallized capacitors in use today. Likewise, Apogee was the only high end audio company using Ohmite 1% mil-spec resistors; everyone else was using (and in most cases continue to use) sand cast resistors. Apogee's crossovers were probably the most expensive in production in their time, and would still cost an order of magnitude more than the great majority of crossovers produced today.
The original crossover design was a simple Linkwitz-Riley second order with the woofer in reversed phase. This type of network allows for the gentlest blending of the different drivers throughout the crossover region and also required the fewest crossover components. The second order high pass also protected the tweeter ribbon from overexcursion, and in fact the ribbon will begin to twist at high excursion long before it goes into a failure mode.
Both the planar magnetic woofer panel and ribbon tweeter were the most advanced produced at that time. There have been some advances in planar magnetic technology since then, largely to increase the efficiency of the drive unit. The tweeter ribbon and its longer siblings still represent the state of the art and remain the best ever made.
The Apogee Stage was superbly designed loudspeaker, considered among the best sounding loudspeakers available in its day, and still much better sounding than the vast majority of loudspeakers produced today. What really amazes me is that the loudspeaker was designed almost completely by ear; the time-windowing measurement equipment that is commonplace today had not been developed in 1988, and this loudspeaker is virtually impossible to measure by conventional means.
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Follow Ups
- Re: MMG OWNERS ,PREPARE TO BE AMAZED : APOGEE CALIPER CROSSOVER ADAPTED TO MMG - JaquesT 10:25:50 03/11/07 (0)
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