We have measured a set of horizontal plane Head-Related Impulse Response (HRIR). The impulse responses were acquired in an anechoic chamber using a KEMAR manikin at four different loudspeaker distances – 3m, 2m, 1m and 0.5m – reaching from the far field to the near field. The loudspeaker was positioned at ear height and the manikin was rotated with a high-precision stepper motor in one degree increments. Besides the raw HRIRs also datasets are available which have been compensated for the use with specific headphone models.
All measurements are freely available for download under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 license. The measurements are described in detail in the companion Wiki or in the AES Engineering Brief
Hagen Wierstorf, Matthias Geier, Alexander Raake and Sascha Spors, A Free Database of Head-Related Impulse Response Measurements in the Horizontal Plane with Multiple Distances, 130th Convention of the AES, London, May 2011.
You can download the database in various formats here.