Just until Christmas... I have up here a 10+ minute 24/96 FLAC file of one of my orchestral recordings. A Rachmaninov movement that's dramatic with chimes, bass drum, percussion, etc. Lots of ultrasonic energy to 37KHz on the bell harmonics. Good resolution testing material. Grab a copy while it's here!
http://www.sendspace.com/file/t4sbvt
http://www.sendspace.com/file/t4sbvt