Final answer:
The statement in the question is False. A subwoofer is not always necessary for a monitor mix, and a wedge monitor can be sufficient in some cases.
Step-by-step explanation:
The statement in the question is False.
Using a subwoofer (or sub) is not always necessary when providing extra low end for a monitor mix. In some cases, a wedge monitor (also known as a floor monitor) can be sufficient to reproduce low frequencies. A subwoofer is typically used when additional bass reinforcement is desired, such as in live concerts or studio recordings.