It's been quiet a while since I used processing and I'm currently relearning it. I have some knowledge with image processing but not with audio processing. 

I need to apply an impulse response of an audio that is 48kHz ( http://www.openairlib.net/sites/default/files/auralization/data/audiolab/york-minster/stereo/minster1_000_ortf_48k.wav) to an audio file that is 44.1kHz. it could be someone speaking for example. If I'm using the correct term, I need to convolve two audio file together so it would sound like someone is speaking inside of a cathedral. What I don't know is how I go about doing this. I looked at minim library since it's the only audio library that I remember using and I found an example that applies an impulse response of  a low pass filter to an audio file. Is there a way to do the same but with two audio files?

I would appreciate if someone could help me out as this is important. Thank you.