The XL is for Xtra Loud!
If your monitoring environment requires reproducing high volume levels (or if you just like to crank things up to "11"), then the Event Tuned Reference 8XL is for you. It uses the same driver and cabinet components as the original TR8, but features two extra powerful amplifiers that delivers a full 150 watts to each monitor (100W to the low frequency driver and 50 watts to the high frequency driver). The TR8XL also incorporates a high-performance toroidal power transformer, which gives the system superior electrical and mechanical noise characteristics. So now you can have that great, accurate Tuned Reference sound, all the headroom you need for live tracking, and the extra "oomph" for the band that wants to hear their opus played backed really loud!
The name Tuned Reference comes from the monitors being precision tuned to provide flat frequency response and uncolored sound, thereby giving the user a true sonic reference for mixing. The design ensures that mixes created on a Tuned Reference monitor will translate accurately to other playback systems.