125 Hz Shearer hump sticking out
[QUOTE=Hz lover;291727]another year has passed, and I finally got the Shearer up
It's really nice sounding with only the 125 Hz Shearer hump sticking out. QUOTE]
You know what? "That 125 Hz Shearer hump sticking out" is characteristic of the Shearer W bin horn which was originally designed by RCA for their own in-house RCA Photophone theater market & incidentally licensed to MGM to be manufactured by Jim Lansing as the Shearer Horn. RCA furnished _within their crossover networks_ a filter network to even out and reduce this 125 Hz hump. The the level of attenuation in this narrow spectrum was adjustable to accommodate any acoustic aberrations in this narrow spectrum otherwise contributed by the theater auditorium.
Other than that, with the W bin sitting on the floor, there is a virtual image below the floor which acoustically doubles the single W bin horn mouth area, and the low frequency response will be the same as a horn of twice the size of the single W bin elevated above the floor. Simply stated, the low frequency response is more robust with the W bin on the floor.
Cheers, herki
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Cats always need to know everything
Quote:
Originally Posted by
JBL 4645
Dizzy(Gillespie) is about 8 months old and believe me, he's already explored all the inside of the speaker.;) [QUOTE/]
Now, This is (Robert) who came into the house in the palm of my hand at the age of four weeks _ tiny as a little mouse on his little back to have his tummy caressed. He is very intelligent & polite. He waits for his food sitting there with his tail curled around his front paws. herki[QUOTE/]