The quality of an audio file plays an important part in the cost of the job. Obviously, clear sound is welcomed and many times will cost less. Yet, sound with background noises, multiple unintelligible sections, and speakers who are cutting each other off or too far from the microphone may result in higher per minute/hourly rates. Some individuals don't mind paying more for transcription, but for those money conscious people,
It really is much simpler to contract a transcription rates and say you've got a job with clear audio, the speakers identify themselves, and the conversation flows nicely than telling them there is "some" background noise, "some" of the speakers don't identify themselves, and there are "some" areas that may be challenging to understand.
This raises an automatic red flag that the audio is not great quality and it could end up costing you more than expected since most transcriptionists will quote a rate once they have listened to a sample of "awful sound."Follow these rules and you'll never need to pay additional for lousy sound again. The transcription service will not be unhappy with the quality and you may be happy with the price. It's a win/win situation.