Manuals & Resources

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.
This Product Is No Longer Available
Comparable Items Can Be Found Here:
Part # 264-622
  • 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

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.

View similar products to the ESS 689-1220 12" Cast Frame Woofer Speaker
in the Woofers product category.


ESS 689-1220 12" Cast Frame Woofer Speaker

Product Q&A

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ESS 689-1220 12" Cast Frame Woofer Speaker

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