In the summer of 2003 the Littoral Acoustic Demonstration Center (LADC) conducted a calibration experiment to measure the acoustic energy output of an industrial seismic exploration array in a frequency range up to 25 kHz. A standard acoustic propagation model, RAM (Range-dependent Acoustic Model by M. Collins), was adapted to model the broadband (up to 1000 Hz) waveguide transfer function for a 21-element moving seismic exploration source array generating acoustic data. Notional source signatures for each airgun in an array were generated by the calibrated airgun modeling package Gundalf, which is based on original theoretical work by Ziolkowski, Hatton, Laws, and others. The package allows modeling of the very close bubble interactions from each airgun in an array. Experimental and simulated data demonstrate good agreement in the frequency range up to 300 Hz. Factors responsible for the discrepancies between measured and modeled data in the higher frequency region are discussed. Environmental implications of variations in the acoustic energy distribution with seasonal and geographic changes in the propagation environment are addressed. [Research sponsored by the Industry Research Funding Coalition through the International Association of Geophysical Contractors.]