ESC
III Highboy

III Highboy

BrandRectilinear
ManufacturerRectilinear Research Corporation
FunctionSpeaker
Produced1971-1975
CountryUnited States
Form FactorFloorstanding
Signal PathPassive Hardware
Dimensions45.7 × 88.9 × 30.5 cm (W × H × D)
Weight70lbs
Frequency Response20Hz-18kHz ±4dB
Treble2" Paper Cone (x2) (Part #ST-2)
Treble2.5" Paper Cone (x2) (Part #T-3, Voice Coil: 0.56", 3oz Ferrite Magnet)
Midrange5" Paper Cone (Philips AD5061/M8, Voice Coil: 1")
Bass12" Paper Cone (Part #P-12KFH)
Impedance (Nominal)8Ω
Crossover Frequencies500Hz, 3kHz, 11kHz
Minimum Recommended Power (RMS)20W
Power Handling (RMS)100W
Enclosure TypeBass Reflex
Enclosure Construction0.75" Particleboard
FinishOiled Walnut
MSRP (1973)$279
Connections
  • Input · Binding Post (Universal)
Controls
  • Midrange Level · Rotary Pot
  • Treble Level · Rotary Pot
NotesModel name changed with introduction of "Lowboy" variant. Updates to crossover made.