The JBL 4412 acoustic pink noise response at the listening position on the speaker axis in our control room at Greenledge Studios on May 17, 2005, after JBL left speaker was refoamed, HIGH=-1 MID=-4, measured using PRAXIS @ 1/12 octave, 65536 points. Raw data obtained using a calibrated Beyer MC740N Microphone set to Omni mode (green trace), and a beyer M88 unidirectional microphone (pink trace). The dip in the response at about 150 Hz is phase cancellation caused by the reflection from the front wall (specifically the wall behind the speakers), which may be corrected by a flush mounting of the speakers.
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