Innersound ESL Amplifier (Sanders Sound Systems)

For Sale (only)

Bought on Audiogon in 2011, tested briefly then stored since then.

Just had this ESL amplifier Factory Serviced by Coda Industries, the original manufacturer of the Innersound ESL for Roger Sanders of Innersound!

(See invoice which provides 2 year P&L warranty. Hard copy of invoice will be sent with amplifier)

Coda provided a NEW shipping box too!

NOTE to clarify any confusion about branding names:

The Innersound ESL was originally factory produced by Coda Technologies.

I emailed Roger Sanders about getting the amp re-capped and Roger directed me to Coda Technologies for all repair work, explaining to me that Coda was the OEM for the Innersound line.

Coda Technologies produces many brand name amplifiers and they have their own corporate brand names for their amplifier lines.

From my extensive phone conversations with Doug Dale, manager at Coda Technologies, they totally understand the amplifier lines which they manufacture and were able to source original equipment (OEM) parts for the refurbishment. Doug is satisfied that this particular ESL is now restored to factory specs.

Buy with confidence, this factory refurbished ESL has been re-capped, tested at the factory and found to be operating at like-new specifications.

Refreshed and ready for decades of service!

Sanders Sound Systems formerly Innersound, the designer, is justifiably proud of the elegantly straitforward engineering that went into the ESL.

This amplifier will power ANY type of speaker with effortless ease and detail revealing transparency.

The amplifier load of electrostatic speakers can be highly variable so the ESL was designed to be MORE ROBUST and less sensitive to the impedance variations in conventional dynamic speakers.

https:// forum.audiogon.com/discussions/innersound-esl-amplifier-good-choice

Compare to its latest sibling amplifier:

https:// sanderssoundsystems.com/products/amplifiers/esl-mark-ii-amplifier

Specfications from manual:

Rated Power

2000 VA/channel, 20Hz to 20KHz, both channels driven into an electrostatic speaker of up to 4nF capacity

600 Watts/channel, 20Hz to 20KHz, both channels driven intoa resistive 4 ohm load

300 Watts/channel, 20Hz to 20KHz, both channels driven intoa resistive 8 ohm load

Bandwidth

-3dB at 5Hz through 100kHz

Distortion

Less than 0.01% from 10 Hz to 30KHz at full ouput, both channels driven.

Gain

26dB

Bandwidth

5Hz through 100kHz

Slew Rate

50 Volts/microsecond

Input Impedance

47kOhm unbalaknced or balanced

Noise

More than 100dB below rated output

Output impedance

Less than 0.01 ohms from 20Hz to 20kHz

Dimensions

17 inches wide by 5.5 inches tall by 14 inches deep

Weight

41 pounds