A Closer Look - Outside

At first sight, the be quiet! Light Base 900 DX has similar dimensions as other big dual-glass enclosures out there, and it clocks in at just under 16 kg. For those who like the same experience but in a smaller form factor, there is also the Light Base 600 series. As we have the white variant, almost all aspects have that color except for the screws which are black. On top of that, there is a silver stripe to visually divide the exterior shell.


From the front, you can clearly see that strip acting as a transition between the glass and plastic. This is also where you will find the IO, which consists of two white USB-A 3.0, one white USB-C and an audio combo jack. On top of that, the Light Base 900 FX has a dedicated LED toggle as well as a reset switch. The IO is centered on that strip and arranged symmetrically. In the rear, you can see that the motherboard is upright, with a bit of room below the expansion slots, so you should have no issues with cooling interfering with your motherboard.


The main glass panel is also framed in white and is close against the glass in the front. It would have been nice to have mitred edges on the glass so that it would look as clean as possible - especially as you could be resting the case on its side. The opposite panel is perforated to allow for airflow and as you can already see, a dust filter has been embedded to keep grime out. There are four rubber caps which you will have to remove when attaching the feet to the case. You will need those, if you are planning to use the Light Base 900 DX on its side.


In the rear, there are eight expansion slots. Each of these are protected by an individual, vented cover. be quiet! has designed this component to be rotatable 90°, so that you may install your GPU upright with the use of a separately available riser cable. Above that, you will find a fan mounting position for a 120 or 140 mm unit. Alternatively, there is enough clearance to install a radiator of identical dimensions. Last but not least, to the left of this and behind the motherboard tray, there is a PSU bay with two sets of mounting holes. While the flexibility to install a unit any way you like is nice, you should probably ensure that your intake fan is facing outward to have direct access to cool outside air.


The top of the case is also meant for venting, with a design that complements the solid components of the case. It has an embedded white dust filter which you may easily remove for cleaning. The design looks great, and the dust filter is well engineered too, but it is also quite restrictive in terms of airflow. Underneath that cover, there is an opening with a fan or AIO mounting bracket. One of the big selling points of the Light Base 900 DX is the fact that it can hold up to three 420 mm radiators of which this is one mounting spot. Alternatively, you may opt for three 120 or 140 mm fans as well. The removable bracket is a nice touch as it allows you to prep your elaborate cooling outside the confines of the chassis. Unfortunately, you will always have to do so, as the design of the case opening blocks access to the mounting holes, so even if you just want to slap some fans in here, you will have to take that extra step.


The underside of the case looks just like the top, including the be quiet! branding. The fact that it is identical is a necessity as you will expose this part of the case depending on how you opt to place your whole system.


At the center of the ability to use the be quiet! Light Base 900 DX upright, on its side or on its head are removable plastic feet. They are labeled to tell you which way to twist them to unlock them. Considering these are made of very soft plastic, you have to be really mindful to not twist the wrong way, as it will tear the clip apart.