IMG_1353 Full size 1920 × 2560 pixels Couf Bass Gets Mini Overhaul The second octave vent that is used from A2 and upwards. Note the smaller opening. Previous image Next image Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Δ This site uses Akismet to reduce spam. Learn how your comment data is processed.