I was ordering some altec 909 'phrams from Bill at Great Plains, and he said they have tested flat, on axis, mounted on 511's, out to 20kHz. Probably would do the same on jbl 2370 flares, which also compensate for the falling CD response by narrowing the vertical dispersion as frequency increases. A "rebuilt" pair with new innards will run maybe $350-400/pair, and handle something like 75 watts, about 112dB/watt eff. Less $$$ than NEW jbl's. 2 bolt mounting only, I'll be trying a pair in my quasi-4 Pi Pro's on the H-290 horns soon. Samps, beat up 908's with blown coils are CHEAP, new 909 'phrams will cost ~$160/pair, and they are easy to change, then the drivers are "good as new":)
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