About the integrity of the 100 to 5000Hz range, where the ear is most sensitive :
With the Pi Midhorn, rather than the JBL 2012H which shows a smooth but ascending curve from 100 to 2500Hz, why not use the really audiophile FE208E Sigma FOSTEX speaker which has a flat response from 100Hz to 5K with an average 97dB efficiency ? Or the less expensive FE206E ?http://www.fostexinternational.com/docs/speaker_comp/FE-E-Sigma-Series.shtml
http://www.fostexinternational.com/docs/speaker_comp/FE-Series.shtml