Electro-Voice EV Sentry I Components: SP12C Woofer, T35 Tweeter, crossover.

The crossover layout and input transformer taps indicate that these components are from the Sentry I, NOT the Sentry IA which was 8Ω only.   The drivers are very high efficiency types, featuring the SP-12C full range woofer and a T35 compression horn tweeter.  

There are no model numbers on the drivers, they've been identified from EV literature.   

 These components were removed from a Mono monitoring setup in a TV broadcast Control Room.  All are in very good condition.  The specs are for the drivers, not the system. 

• SP12 C Cast frame 12 inch woofer with  Whizzer cone
• Freq response:  37hz -10Khz, +/- 6db
• EIA Sensitivity Rating: 100db 1 watt at 1Meter

• T35A Compression Horn Tweeter
• Freq response:  3500 hz -15Khz, +/- 3db
• EIA Sensitivity Rating: 104 db 1 watt at 1Meter

EV Sentry 1000 crossover, with 16Ω, 150Ω and 600Ω taps.

The specifications are from an EV brochure.  Please note that these measurements include a cabinet:

• Frequency Response: 30 - 20,000 Hz
  
• Impedance: 16-150-600 ohms
  
• Power Handling Capacity: 20 watts
   

ARCHITECTS' AND ENGINEERS
SPECIFICATIONS
The speaker system shall be an Electro-Voice Sentry (specify I or II) studio monitor speaker system or equivalent. Frequency response shall be flat within:: 3 db from 30 to 20,000 Hz. Power handling capacity shall be 20 watts continuous program level, and 40 watts for momentary peaks.

A 12-inch low- and mid-frequency range cone speaker, a very-high-frequency driver (utilizing the Sonophase principle of throat design), and a high-frequency crossover network shall be provided, each selected for specific performance so that when combined in a Sentry (specify I or II) monitor cabinet, specified frequency response is assured.