Is louder better?

...prefer Breakfast in America, but some ST better than none...*S*
To each....*S*

Agreed, this older stuff makes the image in the mirror really annoying.
The aids certainly restored mids in a satisfactory fashion...

...esp. when spouse proclaims "You haven't heard anything I've said!" in a much closer proximity....

Saying 'what?' is tantamount to "Kill me Now..." *L*

(Think of it as an 'onboard inline eq with nifty functions...."The best amp you own....You Wear!*VBS* (nft applied for). ;)

There are some general guidance documents on setting up studio monitoring systems for level. Many adopt Bob Katz* approach (1). I came across the following link which is a bit easier to follow (2).
The size of the room is very important, since the -20dB point will need to be at somewhere between 75dB for a smallish room (UK lounge :-) ) to 85dB for a big room which is a big range difference.
* Well known mastering engineer.

When you have a system setup like this, it is surprising how many recordings "snap into focus! In terms of loudness they sound right. Obviously, most systems can go louder, but I've observed that when doing so, although everything is louder, it seems less right. Bear in mind, that domestically available recordings are mixed for domestic consumption, not PA levels of energy. I feel that a system that sounds right at PA levels is probably not right.

(1) https://www.digido.com/portfolio-item/level-practices-part-1/ and https://www.digido.com/portfolio-item/level-practices-part-2/
(2) https://www.gearslutz.com/board/mastering-forum/1024714-depth-bob-katz-k-system-tutorial.html

I dunno... in my late 20’s I put together a car stereo featuring a 2700w amp driving a pair of extremely efficient 15” subs. Tended to make people sick to their stomachs, and no one wanted to ride with me twice. So... maybe not always?

https://boomspeaker.com/noise-level-chart-db-level-chart/

This is a solid resource I send to people.

On previous forums, I've seen posters siting 90db or something crazy like that. Above all, go see an audiologist and have your hearing tested. I've known folks who had terrible hearing and top notch systems. 

I'm surprised the elephant in the listening room hasn't been mentioned: loud cost more money. Doesn't everyone like loud once in awhile? Not a big believer in a "correct" listening level unique for every recording. That said, sure lots of speakers sound best at a certain level for THAT specific room. (Least appreciated factor when designing acoustical treatments for a room.)

Many less expense systems are as competent as others with the difference being the ability to play at concert levels. Cheap ribbons or cheap electrostatics beat cheap boxes any day of the week. As prices increase, things are't that simple.  (But this is another topic)