Mode II comes with 4 sizes of ear tips and getting the best fit is important in ensuring you enjoy the best audio experience. Take the time to find the ear tips that best fit your ear. The ear tips should fit snugly in your ear but still feel comfortable. It is not uncommon to use different sizes for left and right.
When you have selected well-fitting ear tips, fine-tune your EQ settings from the Marshall Bluetooth app to create your custom sound.