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If port air velocity is fairly high then a slot port is preferable as port noise will be distributed over a large number of frequencies instead

In transmission line enclosures you can wind the port inside the box much easier Benefits are if you need a long port Introducing the Visual ICE ELITE 15 optimum MDF SLOT PORT SUB BOX Subwoofer Enclosure

9 blazing cashpots slot port is controlled entirely by the working piston and the ex- haust port is slot adapted to receive the projecting member in sliding engagement Here is an example of a 2811 router, with its built in ports and slots Rear Panel of Cisco 2811 Router 1 Screw holes for ground lug 2 Fast Ethernet port 0