If I have an idea why you'd be asking about slew rate, I'd answer the question. Much like transformer kVA or damping factor, these are specifications that mean nothing on their own and were promoted as a way to play the specs game by a certain manufacturer in the '80s and '90s (they also liked to talk about maximum current delivery without telling anyone that a tweeter can be burned and smoked by even the smallest amplifier...) because that manufacturer knew that the average consumer had no idea what these specifications meant but they could be bandied about by both dealers who knew the consumer had no idea what they meant and the consumer who wanted to try to make some sort of qualitative judgement based on a numbers game. The highest slew rate in the world doesn't guarantee any specific type of performance parameter any more than the highest tire pressure means anything by itself when choosing a car. Simply looking at the distortion levels of any of our amplifiers at high frequencies and maximum power will indicate that they have enough voltage slew to handle just about any AUDIO-BASED signal you throw at them.
In short, the hundreds and hundreds of design decisions made in the overall topology and scheme of the amplifier as a whole make the product. So if you ask what the slew rate is because of ______, it'll lead me to understand exactly what it is you're trying to find out.
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