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
ESS 689-1220 12" Cast Frame Woofer Speaker is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Audax Polydax woofer replacement/ Very HappyThe foam on the Audax Polydax, after all too many years, crumbled to the touch, so time to replace. These are used on quality home built speakers using Rega Jupiter CD players, Marsh Sound Design pre amp and a Balanced Audio Technologies Amp at 200 watts. They are similar in some design aspects to the Audax Poydax which is why I purchased them. They are well constructed and the frames are well finished. I'm very pleased at how quickly they broke in and produced quality sound from the start. I believe they are made in the USA, and you can tell in the quality. Lastly, Parts-Express replied to my question on woofers promptly and gave me options that made sense. So great product and support
Date published: 2012-04-27
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  • clientName_PartsExpressInternational

Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
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ESS 689-1220 12" Cast Frame Woofer Speaker

What cabinet volume is needed to get a -3db of 25hz and 30hz using this woofer and the matching passive radiator?  What is the optimum cabinet size to get the best low frequency response?

Asked by: proaudio
This is a bit of a tricky woofer to model with a passive radiator. The optimal volume that Bassbox spits out is almost 9 cubic feet. You can go much smaller, such as 2,5 cubic feet and still get a tuning frequency around 27 Hz with 100 grams of weight added to the PR. With no weight added, the tuning frequency rises to about 31 Hz.
Answered by: MattP
Date published: 2014-10-06

Can these replace ALL 12" ESS woofers? The ones I would be replacing are #680-0019 because I can't find a recone kit anywhere.

Asked by: Dood
These are designed to replace the ESS AMT woofers although in the right application they can work for others as well.
Answered by: MattP
Date published: 2014-07-07

Is this product a direct drop in for the ESS AMT1b speaker as well as for the ESS monitor speakers

Asked by: Johnzel
I think these are all the same woofer for the tower or the front firing hiel with the passive 12 on back,memory from 1977 has sorta faded, i put two ess 10's and two hiels on the back deck of 1978 sirocco and vented the box. small craig amp cassette deck for it's day it ruled
Answered by: digitalhaven 53
Date published: 2011-11-18
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