Clearance Item

ESS 689-1220 12" Cast Frame Woofer Speaker

Brand:| Model: 689-1220
Buy a speaker with the engineering quality and transient response to match the ESS AMT-1 Air Motion Transformer—the ESS 689-1220 12" cast frame woofer.
  • Treated and reinforced paper cone with rubber half-roll surround
  • Attractive, sturdy cast aluminum frame keeps components in alignment
  • Pure copper 2" voice coil wound on black aluminum former provides high power handling
  • Linear suspension system and bumped back plate for maximum bass
  • Highly conductive/fatigue resistant woven tinsel leads
  • Superior transient response guarantees highly accurate sound reproduction
  • Drop-in replacement for the ESS AMT Monitor speaker system
Part # 
Weight: 11 lbs.  
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Product Details

ESS 689-1220 12" Cast Frame Woofer Speaker

How do you find a 12" woofer that matches the speed, accuracy, and audiophile performance of the ESS Air Motion Transformer? Look at the ESS 689-1220 12" cast frame speaker! The ESS 689-1220 incorporates fine engineering and uncompromising materials, resulting in an accurate, reliable, and eminently listenable bass woofer.

A treated and reinforced paper cone, combined with a high-strength 40 oz. ceramic magnet and 2" copper voice coil, provides ultra-fast transient response that really makes music come alive. The woofer's cast aluminum frame is strong and rigid—necessary if you want to enjoy music for years to come.

Product Specifications
  • Nominal Diameter12"
  • Power Handling (RMS)200 Watts
  • Power Handling (max)400 Watts
  • Impedance4 ohms
  • Frequency Response29 to 1,500 Hz
  • Sensitivity91.5 dB 1W/1m
  • Voice Coil Diameter2"
  • Magnet Weight35 oz.
Thiele-Small Parameters
  • Resonant Frequency (Fs)24 Hz
  • DC Resistance (Re)3.9 ohms
  • Voice Coil Inductance (Le)0.73 mH
  • Mechanical Q (Qms)4.9
  • Electromagnetic Q (Qes)0.52
  • Total Q (Qts)0.47
  • Compliance Equivalent Volume (Vas)6.69 ft.³
  • Maximum Linear Excursion (Xmax)6 mm
Materials of Construction
  • Cone MaterialTreated Paper
  • Surround MaterialRubber
  • Voice Coil Wire MaterialCopper
  • Voice Coil FormerAluminum
  • Basket / Frame MaterialCast Aluminum
  • Magnet MaterialFerrite
Mounting Information
  • Overall Outside Diameter12.375"
  • Baffle Cutout Diameter11.125"
  • Depth5.625"
  • # Mounting Holes4
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume3.31 ft.³
  • Sealed F341 Hz
  • Vented Volume9.14 ft.³
  • Vented F321 Hz
ESS 689-1220 12" Cast Frame Woofer Speaker
  • BrandESS Labs Inc.
  • Model689-1220
  • Part Number264-622
  • UPC844632092701
  • Product CategoryWoofers
  • Unit of MeasureEA
  • Weight11 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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ESS 689-1220 12" Cast Frame Woofer Speaker

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ESS 689-1220 12" Cast Frame Woofer Speaker

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