The first visual impression of the Jonsbo A4 is very good. The front panel is firmly attached to the body, was made of aluminum and is completely closed. The I/O panel can be found in the lower left area. Jonsbo gives the chassis one USB 3.0 Type-A and USB 3.2 Type-C port each as well as a power button.
The lid section is very airy in favor of better airflow. Made of aluminum, the lid element was equipped with a ventilation grille, which differs significantly from normal mesh in terms of its design and thus neatly enhances the appearance. The lid is connected to the body via six rubber rings. If you push the aluminum plate backwards, the lid can be removed, revealing the two 120-millimeter fan slots.
The A4’s side panels are clearly designed for looks. That’s why both side panels are made of a 4 millimeter thick Tempered Glass and allow a good view of the components inside. The assembly is completely tool-less, but requires the removal of the lid beforehand. After this has been removed, the side panels can be pulled out upwards. To prevent vibrations, the insides of the panels were covered with foam rubber.
As with many current ITX cases, the Jonsbo A4 uses a sandwich layout. This means that the mainboard and graphics card are mounted back to back. The back of the A4 is designed accordingly. On the left side is the opening for the I/O shield and on the right side the PCI slot covers for the graphics card. The socket for the power cable is also hidden in the lower right corner. To achieve a uniform visual impression, the back is also made of aluminum.
The Jonsbo A4 gets a firm stand from four removable feet, which are made of steel and covered with a layer of rubber. To ensure that the feet hold without screws, there is a magnet on the top. Additionally, a screw is included with each foot. Otherwise, the underside is defined by two large and filtered fan openings. Two 120-millimeter fans can be installed here. The filters are clipped and can be easily removed for cleaning.
The exterior finish is of a high standard. The use of aluminum in visible places makes the A4 look very high quality. All drilling and milling is clean and there are no paint or processing defects.