InnerSoundESL Electrostatic Stereo Power AmplifierusedInnerSound ESL Electrostatic Stereo Power Amplifier  (15220)Product: InnerSound ESL Electrostatic Stereo Power AmplifierProduct SKU: 15220Serial Number: CEX30449Voltage: 100V / 120V / 220V / 240VCosmetic Description: 8/10 Excellent condition with minimal vi...1512.00

InnerSound ESL Electrostatic Stereo Power Amplifier (15220) [Expired]


no longer for sale


Product: InnerSound ESL Electrostatic Stereo Power Amplifier

Product SKU: 15220

Serial Number: CEX30449

Voltage: 100V / 120V / 220V / 240V

Cosmetic Description: 8/10 Excellent condition with minimal visible cosmetic wear including a scuff mark and faint rub marks on the top cover, and a small scuff on the front faceplate to the left of the InnerSound logo. These blemishes are not readily visible and do not detract from the overall wonderful appearance.

What is Included: Amplifier, Manual, Power cable, Factory packaging (not original)

Functional Notes: Operational condition of this item is excellent, fully tested and no issues found.

Age: Unknown

# of Owners: 1

Tobacco Exposure: No

Service History: None

MSRP: $2995

Other Notes: "An amplifier must deliver more current as the impedance of the speaker decreases. This requires a larger power supply and output devices that can pass large amounts of current. Such parts are costly, so modestly-priced amplifiers are only designed to drive relatively high impedance loads -- like 8 ohm speakers. Better amps use superior parts and can handle 4 ohm loads.

But few of even the best amplifiers can handle the very low, 2 ohm impedance of an ESL well. Many otherwise fine amplifiers find themselves unable to pass sufficient current through their output stages to drive an ESL at high frequencies. This is known as "current clipping", and results in poor high frequency performance. Tube amplifiers are particularly bad in this regard due to their relatively high, 4 ohm output impedance.

The InnerSound Electrostatic Amplifier ("ESL amp") solves this problem by using a massive output stage. Each output transistor is capable of delivering 250 watts -- and there are eighteen of these per channel. As a result, it can deliver a staggering 135 amps of current with a combined power rating of 4,500 watts per channel! The output impedance of an amplifier must be lower than the impedance of the speaker, or current clipping will result. With so many output devices, the output impedance of the ESL amplifier is virtually zero. Current clipping simply is no longer an issue." - Roger Sanders, InnerSound

Reviews:  Stereo Times

Shipping: Cost to ship this item within the contiguous United States is a flat rate of $65- including packaging and insurance. For all other locations including Hawaii, Puerto Rico and Alaska, please request a quote prior to purchase. Items with factory packaging will be double boxed. When factory packaging not available re-usable shipping box with custom injected-foam mold will be used. (for all items over 10 lbs). Note that all items valued over $500 will require a signature upon delivery.

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