Great audio is about more than a single component. Speaker placement, the interior of the vehicle and the condition of the system all shape what you hear.
A muddy sound, rattling or sudden distortion can be a sign that something needs attention. Keeping speakers clear of dust and debris, using good source audio and avoiding constant max-volume listening can help.
When the system needs more than a quick check, a professional installation can bring better balance, clearer sound and more useful modern features to the drive.