The quick answer is “Yes, of course you should.” The more complex answer is “But only if you need it.” Your iPhone has an equalizer built in, although it’s not exactly easy to find.
The Lumia 950 and Lumia 950 XL offer a built-in sound equalizer with 14 presets. If that's not enough, you can use the custom setting to satisfy your needs. The equalizer page isn't very obvious to ...