Hi, I notice in Troels' Faital 3WCs + Spendor's Classic 3 ways, an MTW arrangement is used, with the midrange driver surface mounted in the former.
Is the MTW arrangement used primarily for improving time-alignment? Does it cause other problems? And does surface mounting a midrange negatively affect diffraction from the mid and/or tweeter?
I'm gathering ideas for a simple 3-way, and surface mounting would seem to make the woodworking easier.
Is the MTW arrangement used primarily for improving time-alignment? Does it cause other problems? And does surface mounting a midrange negatively affect diffraction from the mid and/or tweeter?
I'm gathering ideas for a simple 3-way, and surface mounting would seem to make the woodworking easier.
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I believe the technique is used to manipulate the degree angle of the summed forward lobe.
In the case of the tweeter above the mid, both mounted flush (sans a waveguide on the tweeter) the forward lobe would most likely point toward the floor as the acoustic centers aren't aligned (tweeters' A/C being forward of the mid). Inversion of the drivers basically flips the lobe direction upward in a mid above tweeter alignment (both flush mounted).
This is a good way to handle alignment issues in a passive loudspeaker. A DSP controlled loudspeaker can accomplish this w/electronic delays.
In the case of the tweeter above the mid, both mounted flush (sans a waveguide on the tweeter) the forward lobe would most likely point toward the floor as the acoustic centers aren't aligned (tweeters' A/C being forward of the mid). Inversion of the drivers basically flips the lobe direction upward in a mid above tweeter alignment (both flush mounted).
This is a good way to handle alignment issues in a passive loudspeaker. A DSP controlled loudspeaker can accomplish this w/electronic delays.
