Here you can download some of the US-English acoustic models I trained using my Sphinx Wall Street Journal Training Recipe.

Models are available using different amounts of training data, number of senones, continuous vs semi-continuous, HMM topologies, and number of Gaussians per state. They all are using the 40 phone set from the CMU dictionary (without stress). Except where indicated, I trained using 1s_12c_12d_3p_12dd acoustic features. All models were trained on 16kHz audio, except for the narrowband ones which were downsampled 8kHz audio.

The garbage phone models have an extra X phone added for use in garbage modelling. I replaced 10% of the words in the training transcripts with a garbage word with a pronunciation consiting of the X phone repeated for each phone in the real word's pronunciation. I'm not sure if this is the best way to do this, but it seems to work.