Yes, the noise cancelling headphones can be used without music too. Over the past few decades, the technology has come quite a long way, especially for personal listening devices such as headphones.
If you already have the best quality of speakers, then you just need an amplifier with a preamp and it converts the weak electrical signal. The ideal preamp will always be liner and have high input impedance.
When it comes to the audio reproduction, then you must concern about specific things like power amplifier and preamplifier.
DJ controller might come with tons of confusing connections and you must understand how to connect DJ controller to speakers.
