Do you need a new head unit when running amp and subs?

You don't necessarily need a new head unit when running an amplifier and subwoofers, but it can enhance your audio system's performance. If your current head unit has low power output, lacks the necessary preamp outputs, or doesn't support the features you want (like tuning options or Bluetooth), upgrading may be beneficial. However, if your existing head unit meets your needs, you can still use it with an amp and subs by connecting them properly.