EV Sentry I Monitor Components

Judging from the crossover layout and input transformer taps, these compontents are from the Sentry I, not the Sentry IA which was 8Ω only.   The drivers look like the SP-12 and T35, but the woofer frame is wrong and there are no markings on either driver to indicate the actual model.   

 These components were removed from a Mono monitoring setup in a TV broadcast Control Room.   All are in very good condition.   

• Cast frame 12 inch woofer with a Whizzer cone
• Compression Horn Tweeter and driver
• EV Sentry 1000 crossover
• Baffle board with grille 

Here are some of the specifications from an old EV Sentry I brochure.  Please note that these measurements include a cabinet:

• Frequency Response: 30 - 20,000 Hz
  
• EIA Sensitivity Rating: 49 db
  
• Impedance: 16-150-600 ohms
  
• Power Handling Capacity: 20 watts
  
• Finish: sanded and sealed
  
• natural birch
  
• Size:   
  • 21-1/2 inches high (at rear), 37 inches wide,
    
  • 16-3/8 inches deep at top
• Weight:  82 pounds
   

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.
EIA sensitivity rating shall be 49 db.

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.