Located 30 feet underground, the trapezoidal rooms can be accessed by the studios and mastering rooms to add rich reverberation to a vocal. Each of the chambers has thick concrete walls and ceilings. Sound from the studio is sent to speakers in the echo chambers, which is then picked up by microphones and returned to the recording media. With speakers on one side and microphones on the other, the chambers can provide reverberation lasting up to 5 seconds. Capitol Studios also features an on-site mastering department with five dedicated mastering rooms and two Neumann lathes used to cut lacquer for vinyl. Their team also has access to the legendary echo chambers, analog tape machines and digital technology, as well as proprietary custom-built gear, handmade in-house by Capitol's technical and engineering staff. Artists like Pink Floyd, the Bee Gees, the Beach Boys, R.E.M., Deep Purple, Glass Animals, N.W.A., Red Hot Chili Peppers, Miley Cyrus, and Selena Gomez have all had projects mastered at Capitol Studios. Vinyl mastering is a specific craft. The characteristics of the format require the engineer to pay particular attention to decision that precede the cutting process related to the mix, EQ, compression, and timing. Capitol Studios mastering department includes two vintage Neumann lathes used to cut lacquer in all formats including 7", 10" and 12". Their vintage lathes have been used to cut such notable albums as Pink Floyd's "The Dark Side of the Moon", the Bee Gees' "Saturday Night Fever" (soundtrack), Paul McCartney's "Band on the Run", George Harrison's "All Things Must Pass", John Lennon's "Plastic Ono Band", Ringo Starr's album "Ringo 2012", and Boston's debut studio album "Boston". For the last 27 years, Paula Salvatore, Vice President of Capitol Studios, has managed the studios. Arthur Kelm is the VP/General Manager and Chief Engineer and Patrick Kraus, from Universal Music Group, is the SVP, Head of Studio, Production and Archive Services. Recording activity at the studios could become hampered by the proposed construction of a nearby condominium building and underground parking lot, which would involve heavy equipment working within 18 feet of the underground chambers.