Planar Speaker Asylum

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RE: top end is a touch shrill now

Posted by JBen on February 17, 2012 at 08:58:54:
This "shrill" may be turn out to be a common thing with raised MMGs. I am just speculating but I am researching it these days. It is hard for me to be sure because my MMGs are of the original design. These have somewhat different "stringing", with less tweeter runs (6 vs 8 in newr models).

For years, I left my MMGs on the floor and standing straight, 90 degress. Though I tested raising them early on, they were not yet as optimized as today. So, I did not catch the "shrill" thing earlier.

Last year, I started raising them (long story). The "shrill" started showing up. The measurements mainly indicate a peak at and around 3khz...smack in the area were the ear is very sensitive. (There's another peak further up close to the 6khz range, but less strong)

If this is related at all, for now, I can suggest what PG must have discovered very early on. A slight tilt backward. PG has always said that they sound better this way. I can only say that when raised, MINE stop displaying the peak as they are progressively tilted. At just around 4-5 degrees, it pretty much goes away.

There is a price for me to pay if I tilt. I am fighting to avoid it here with no tilt.