It s how much power they draw that is important.
Elder amp draw.
You could also get a current or power meter between the amp and the socket.
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They will base the wire size and circut breaker on whatever current draw you give them.
Ot general amp draw of a car stereo.
Find out what the current draw of the 200 amp unit you will be buying is and let the electricians know.
If your amp draw is high unloaded there is an issue with the system as it is currently running.
A high unloaded amp draw signals an issue with the drive motor over tensioned drive belt bad bearings in the front and or rear rollers and or an over.
The issue is not going to be the belt and deck at least not entirely more on that later.
The kenwood head unit with built in 4 channel amp that i used for my son s boombox consumed 0 5a at very low volume and 1 to 2a at reasonably high volume.
Many amps have the max power draw on the back near the power cord.
This was the average current draw taken with a slow responding dvm so i would expect much higher peak current draw but did not measure it.
In some cases like circular and table saws amperage draw can approach 15 which may make a standard 15 amp circuit marginal.
An amp running at at a low stage volume may only be putting.
Obviously the max power draw only happens with the amp dimed so a meter would be the best way to find the power drawn under given conditions.