Yes.......and Yes/No.
This is kind of a "loaded" question. Depends on how you're using it in a sentence (Ludwig Wittgenstein: words get their meaning through their use).
As an "adjective" I would have to say yes. I am a hi-fi enthusiast because I love the reproduction of music with high fidelity. Therefore, yes, I am enthusiastic about the reproduction of music in high fidelity.
As a "noun" I would have to say yes, but it must be qualified, because I am not enthusiastic about equipment as such. Let me explain.
Like everyone else here, I love my music. My "hi-fi" exists in my home to reproduce music as well as my budget will allow (and I know high cost alone doesn't mean quality). Don't get me wrong, I like the equipment I have and I feel proud and lucky to own it. Proud? Well, I spent a lot of time doing my homework to spend $X to get the best sound I could for $X, so I'm proud I did a good job. I took the time to research, drove hundreds of miles, and auditioned a variety of products. I'm proud I put the effort into such an important purchase. But am I enthusiastic over equipment? The answer is no. To me, the equipment is a means to an end. Sure, I look to see what's out there, and in fact tonight I drove 3 hours round trip to hear a set of speakers. But do I desire, crave, or lust for a better hi-fi? Am I looking to replace and upgrade constantly? Is my focus when listening to music on the music, or is it on its reproduction? When I listen, am I enjoying the artists making the composers work come alive, or am I listening to how awesome my hi-fi reproduces the sound? Like I said, the answer is both yes & no.
This also makes me thing about what "critical listening" means. Critically listening to the sound reproduction? Or critically listening to the performance that was captured? Depends on what you're listening for.
As you can see, I've just used 8 question marks in my reply.....so obviously I really don't have any answers, so please don't take offense to my remarks. I'm really not worth your effort. My first degree was in
philosophy. It took me several years to realize that what was really important was not having the answers, but asking the right questions. Thought provoking?