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My acoustic ceiling...

is not a porous absorber!

Being synthetic fabric under tension, it's rather of the membrane type with 26 cm air space behind and partially filled with rock wool to improve the broad-band effect.

alpha values for 20 cm air space + rock wool are

125 Hz - 0.72
250 Hz - 0.65
500 Hz - 0.71
1000 Hz - 0.75
2000 Hz - 0.84
4000 hz - 0.94

You said: "When it comes to getting practical benefits, a lot less than 100% efficiency can still be very effective."

Recommendations, such as

http://www.tonmeister.de/foren/surround/texte/SSF_01_1_E_2002_v2a.PDF

require the level of first reflections to be 10 or 15 dB below the level of the direct sound. Are commercial absorbers capable of doing that and what thickness do you need to address 200 Hz? Note that the figure 15 dB is based on speech, music needs between 18 and 25 dB!

Klaus

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