Electro Voice Sentry III specifications

Category : Speakers

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Tech nical data

Special equipment

Notes Variants

• Manufacturer: Electro Voice
• Model: Sentry III
• Years of construction: Finished box 1972-1984, from 1985 as a kit
• Manufactured in: USA, Switzerland
• Color:
• Dimensions:73.5 x 92 x 53 (W x H x D)
• Weight: 71 kg
• Factory price approx.: 3.400 DM (per box)

• Type of construction: 3 way, bass reflex with high-frequency protection
• Chassis:
  • Woofer: 15 inch, finished box 815 9062, kit DL15W, 2.5" voice coil, foam surround
  • Midrange driver: Horn SM120 with driver 1823, kit 1824M (1" neck diameter, 2" voice coil)
  • Tweeter: Horn ST350A ferrite magnet round under Cover cover (1" neck diameter, 1" voice coil), ST350B ferrite magnet angular kit
• Load capacity (manufacturer's specification of nominal/musical b.): 50 W Sine / 500 W
• Efficiency (manufacturer's specification): 97 dB/2.45V/m (average value 300-2000 Hz)
• Frequency response (manufacturer's specification):
  • 40-18000 Hz ± 3dB (manufacturer's specification)
  • 28-18000 Hz (manufacturer's specification, with equalizer SEQ 3 and closed lower reflex channel)
• Cut-off frequencies (manufacturer information): 600/3500 Hz
• Nominal impedance (manufacturer information): 6 ohms

• Woofer: 15 inches, ready-made box 815 9062, kit DL15W, 2.5" voice coil, foam bead
• Midrange driver: Horn SM120 with driver 1823, kit 1824M (1" neck diameter, 2" voice coil)
• Tweeter: Horn ST350A ferrite magnet round under cover (1" neck diameter, 1" voice coil), kit ST350B ferrite magnet angular

• 40-18000 Hz ± 3dB (manufacturer's specification)
• 28-18000 Hz (manufacturer's specification, with SEQ 3 equalizer and closed lower reflex channel)

• Optional SEQ equalizer for step-down to 28 Hz with closed lower reflex channel

• Discussion Woofer 815 9062 , B15, DL15W: Always 815 9062 in the finished box, in the kit, according to an Electro Voice brochure from 1986, the B15 is called TT. Whether there has ever been a TT marked like this is quite uncertain. There are neither pictures nor an EDS (EngineeringDataSheet) as proof of existence. Perhaps the risk of confusion with the 15B was too great and it was renamed. In a prospectus from 1989, the DL15W is mentioned as the TT of the Sentry III. There are pictures of this and an EDS from EV. Unfortunately I have no brochures from 1987/8.
• Discussion tweeter ST350A/B: Both versions have a ferrite magnet. There is no EDS from EV for the ST350A, but there are many pictures and a video showing the round ferrite magnet under the hood. https://www.youtube.com/watch?v=siLw6EgSDmE
• Discussion Midrange driver 1823/1824M: The 1824M has a lower efficiency and the crossover therefore has a changed voltage divider: 2.5/13 ohms. 1823 with voltage divider 3.5/8 Ohm .
• In the finished box, the crossover was tacked on the inside to the upper rear wall, for the kit it was possible to purchase a crossover on a board.
• Measurements of HiFi-Selbstbau.de certify the Sentry III finished box with 815 9062 TT as a case that is much too large for the parameters. The omnidirectional behavior of SM120 with 1823 MT driver and HT SM350A, praised by EV, is hardly available after that.

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