from here:
http://www.prosoundweb.com/article/...t_las_sports_arena_with_bruce_springsteen/P4/
Power Amplification
Amplification for the house system comprises Phase Linear 700 amps built to Clair Brothers’ specifications.
The grounding and output stabilizing network was modified to make the output “electronically a little beefier,†and the chassis fabricated from steel rather than aluminum.
According to Jackson, “The basic ‘Phase’ has a lame output network. If it goes, it makes the amp tend towards oscillation, which is compounded by the inter-amplifier capacitance of the long feeds we run up to the speakers. The long cable runs also reduce the damping factor by adding unwanted impedance to the amplifier.â€
Clair Brothers used to hang the amplifier racks with the speakers, but if an amp or speaker blew during a show there was no way to re-patch it until after the performance. Instead, it was decided to run heavier (12-gauge) cable, and keep the amplifiers on the ground.
There are 14 amplifier racks with four Phase Linears in each. The top amp in the rack drives the highs in four cabinets (two cabinets per side); the second amp down the mids in four cabinets; and the third and bottom amp the bass (one cabinet per side). The two top amps are loaded to about 350 watts into 8 ohms per side, while the bass amps are rated at about 700 watts into 4 ohms per side. All amps are transformer isolated from the console.
Look like 700B used here
http://www.prosoundweb.com/article/...t_las_sports_arena_with_bruce_springsteen/P4/
Power Amplification
Amplification for the house system comprises Phase Linear 700 amps built to Clair Brothers’ specifications.
The grounding and output stabilizing network was modified to make the output “electronically a little beefier,†and the chassis fabricated from steel rather than aluminum.
According to Jackson, “The basic ‘Phase’ has a lame output network. If it goes, it makes the amp tend towards oscillation, which is compounded by the inter-amplifier capacitance of the long feeds we run up to the speakers. The long cable runs also reduce the damping factor by adding unwanted impedance to the amplifier.â€
Clair Brothers used to hang the amplifier racks with the speakers, but if an amp or speaker blew during a show there was no way to re-patch it until after the performance. Instead, it was decided to run heavier (12-gauge) cable, and keep the amplifiers on the ground.
There are 14 amplifier racks with four Phase Linears in each. The top amp in the rack drives the highs in four cabinets (two cabinets per side); the second amp down the mids in four cabinets; and the third and bottom amp the bass (one cabinet per side). The two top amps are loaded to about 350 watts into 8 ohms per side, while the bass amps are rated at about 700 watts into 4 ohms per side. All amps are transformer isolated from the console.
Look like 700B used here
