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[Kyle_Keating]

   Simple Question , Which one wins ? Or mabey not so simple    Ill get to hear the McCauley next week , 2 of the driven by 2 powersoft K20's in a stadium so should be fun.

Is the M421 an isobaric design? Meaning each pair of 21's are loaded front to back in the same baffle? Or is this a quad loaded horn?

[Art Welter]

Is the M421 an isobaric design? Meaning each pair of 21's are loaded front to back in the same baffle? Or is this a quad loaded horn?

Kyle,

The M421 is an isobaric tapped horn, photos of the isobaric chamber which contain the drivers loaded front to back are visible in the review linked in post #4.

Art

[Kyle_Keating]

Kyle,

The M421 is an isobaric tapped horn, photos of the isobaric chamber which contain the drivers loaded front to back are visible in the review linked in post #4.

Art

Thanks Art, I see it now, the left front drive has been removed in this picture. Is the chamber between the pair of drivers part of a horn or just an isolated volume?  And are the woofer in or out of phase in this alignment?
https://soundforums.net/attachment.php?attachmentid=1579&d=1308795096

[Art Welter]

Is the chamber between the pair of drivers part of a horn or just an isolated volume?  And are the woofer in or out of phase in this alignment?
https://soundforums.net/attachment.php?attachmentid=1579&d=1308795096

The isobaric chamber between the drivers is isolated from the outside atmosphere. The two drivers and the air in the isobaric chamber combine as one driver driving the tapped horn. The two drivers face the same direction and are wired in the same polarity, positive voltage makes both drivers go the same direction.

[Kyle_Keating]

The isobaric chamber between the drivers is isolated from the outside atmosphere. The two drivers and the air in the isobaric chamber combine as one driver driving the tapped horn. The two drivers face the same direction and are wired in the same polarity, positive voltage makes both drivers go the same direction.

Thanks Art

[drew gandy]

Thanks Art

And to add to Art's calculations comments earlier, isobaric systems tend to use up precious cabinet space (usually in the name of shrinking cabinet size, go figure) with the chamber of air and other parts necessary to fit the pair of drivers together.  That means that the Danley likely has an even greater "total cubic space" advantage than might appear on paper.  But, this is not to say that there aren't other advantages to the isobaric configuration.  McCauley may very well have gone with this configuration because they couldn't find (or manufacture) a single 21" with the parameters they wanted. 

[ProSoundWeb Community]