What the Eris speakers try to do is make it as simple as possible for you to get a linear frequency response in your home studio. Obviously every room is different so this is no easy task, but Presonus have taken a lot of the guesswork out of it for the end user. There is a three stage switch that allows you to tailor the sound of your monitors to suit the space you are working in. So, whether your monitors are near the walls of the room, or more central, you can adjust the low frequency response at the flick of a switch to match their positioning and take away the increased low frequency response you get from placing speakers in a corner.
Given a small room, once you have set the acoustic space controls and got you input gain set to a level that suits the rest of your system, you should find these to be a very workable pair of monitors. They do not deliver too much volume, as it is not needed for near-field monitoring, nor do they create a false low frequency delivery to make them sound bigger than they actually are. The front ported design allows them to be used close to a rear wall, but being of the slotted nature, the porting doesn’t tend to chuff as air is expelled from the cabinet, keeping physical operation noise to a minimum.
In all, these monitors tick all the boxes for a pair of home studio speakers in their price range. I wasn’t overly excited about the gain and EQ pots on the rear of the unit, but then again, you really only need to set them once and never really touch them again. So, with that in mind, the flat design of the knobs is probably a good thing in that it stops them from getting damaged if you move the speakers about.