ESS Large Bookshelf Speakers - $325 (Eugene)

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condition: like new
make / manufacturer: ESS
model name / number: PS 9a

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ESS model: Performance Series PS-9a
Manufactured in USA 1978-83

For over forty-five years ESS has been on the cutting edge of audiophile sound reproduction
One of the most popular ESS Performance Series models... the 1978 ESS PS 9a speakers utilize a high quality 8" woofer with the Larger bezel mounted Air Motion Transformer Tweeter...
A large labyrinth (internal cabinet volume) and a high quality woofer provides lower bass frequencies. The result is spot-on accuracy... superior sound reproduction and extended Dynamics

Technical overview
German Scientist Oskar Heil's Famous *Air Motion Transformer (*A.M.T.) tweeter
* A.M.T: Accordion-like folded Metalized Mylar pleats 0.0005 inch thick suspended within a powerful opposing magnetic field ...
Applied audio signals react to the magnetic field and stimulate the Mylar membrane.
The bellows-like motion of the folded pleats "squeezes" air out five times faster then the air motion of a conventional cone / dome tweeter
* See diagram above

Drivers per cabinet:
Bass frequencies: One 8” High performance Woofer
High frequencies: One (Patented) Heil Air Motion Transformer Tweeter
Acoustic suspension (Sealed cabinet) design

Frequency Response: 29 Hz - 22 kHz
Sensitivity: 89 dB / 1 Watt / 1 Meter
Allowable Input Power: 150 Watts (Clean)
Dimensions: 19 1/2" tall x 10 1/2" deep x 11 1/2" wide

The ESS PS 9a's provide Audiophile dynamics and amazing sound-staging and imaging in a pristine condition walnut cabinet

Near Mint condition
5-way binding post (Banana-jack) upgraded connections added
* Stands not included
Please CALL for information / Audition
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post id: 7753422489



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