I have a question. I purchased https://www.amazon.com/gp/product/B07N8R41MJ/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 and in the back section I cut two holes and mounted 2 https://www.digikey.com/en/products/detail/orion-fans/OD9238-12HB-VXC10A/2707947 and have them wired into a 12v power supply. My problem is they are 75-80 db when on full speed even though they are stated at 50 something dbs. I would like to control the speed of these fans and not sure how to do this. I've taken out the bottom shelf and added an xbox and put the fans in to keep the xbox cooler. I have a monitor mounted to the top of the shelf. My problem is its not connected to a computer so was trying to find a decently easy way to control the speed of the fans