You can find copies of JBL manuals on JBLPro.com. These manuals are in PDF format, and you can view them online or download them from the support section of the website.
JBLPro.com offers a product category list on the home page of the website. From this list, you can find your product by selecting the category under which it would be found and clicking on the link below its image. In the media library section of the page, you can click the plus sign next to the user guides link to expand the menu and access the manual for your product.