The URS N4 series equalizer is very broad banded and musical. It is a must have tool for recording and sweetening drums and bass. It is smooth and silky and a little goes a long way. It has a hi-pass filter with four frequencies- 27Hz, 47Hz, 82Hz, 150Hz and 270Hz. It has a lo-pass filter with five frequencies- 3.9k, 5.6k, 8.2k, 10k, 12k, and 18k. The Low Band is selectable peak or shelving and is selectable with five frequencies- 33 Hz, 56 Hz, 100 Hz, 180 Hz, and 330 Hz. The Low Mid band has ten frequencies - 220Hz, 270Hz, 330Hz, 390Hz, 470Hz, 560 Hz, 680 Hz, 820 Hz, 1k and 1.2k. The High Mid band has ten frequencies - 1.5k, 1.8k, 2.2k, 2.7k, 3.3k, 3.9k, 4.7k, 5.6k. 6.8k and 8.2k. The "Hi-Q" button on the mid bands selects a narrower bandwidth. The High band is selectable peak or shelving and is selectable with six frequencies- 10k, 3.3k, 4.7k, 6.8k,10k, and 15k. Main Features: Pro Tools 8.x and Leopard OSX 10.5.x compatibilityPro Tools 7.4.x and Leopard OSX 10.5.x compatibilityPro Tools 8.x and Tiger OSX 10.4.x compatibilityPro Tools 7.x.x and Tiger OSX 10.4.x compatibilityPro Tools 7.x.x M-Powered version compatibilityFull Windows XP and Vista support!Full Pro Tools TDM support for Pro Tools|HD Accel and Pro Tools|HDFull 192 kHz support for TDM, RTAS and AudioSuite versionsFull ProControl, Control|24, Command|8 and Digi 002 supportFull ICON Console Control Surface support — including center section Dynamics panelSupports Mbox, Digi 001, Digi 002, Digi 002 Rack, Pro Tools|24 MIX, Pro Tools|HD and Pro Tools|HD Accel and M-Audio Interfaces.Audio Units support for Logic Pro 8.x thru 6.x, Digital Performer 6.x thru 4.x, Bias Peak 6.x thru 4.x, Abelton Live 7.x through 6.x, Final Cut Pro and more!VST support for Mac and PC Cubase, Nuendo, Sonar, Abelton Live, Acid, Sound Forge, Reaper, Wavelab, Bias Peak and more! Registration InformationSerial Number