I'm starting to do a lot of serious audio testing, and the HP 3325A would be very cool to have. I could generate tones using software, such as the very popular NCH Tone Generator, and there are ...

Stéphane Pigeon. The site contains various “test” files for audio benchmarking, a tone generator you can use to create .wav files, and a testing section to see how well-trained your ear is ...