Someone is probably going to get upset, but in a nutshell yes. It depends on what you are going to use the website for. E-commerce, I would absolutely not do that. If you are a local realtor, I don't think it matters at all. Zip Zero!
A ".com" is the top of the food chain. If you don't believe me, just search the internet for a few of the things in your pantry, your hygiene products, or even your local dealerships.
There is nothing wrong with using a "-" like dj-equipment.com. Be creative. I would not use the business structure LLC in your domain name, as it too has an inferior stigma to it. (I know plenty of Fortune Companies use LLC, but so does Joe the shade tree mechanic!). ABC-Inc, and ABC-LP would be fine.
I consider a domain as a foundation to a businesses name.