ESL Electrostatic vs Hegel H20
The H20's power @ 8ω is 200W against the ESL Electrostatic's 360W, its damping factor >1000 against >600, and its thd 0.006% against 0.080%. Both share signal-to-noise (100 dB).
AI-generated product photo — not official manufacturer imagery.
ESL Electrostatic
InnersoundAmplifiersPower AmplifiersDiscontinued
Estimated price (community-sourced)
$2,500
Around — community and catalog average, updates slowly
About the ESL Electrostatic
The Innersound ESL Electrostatic Stereo Power Amplifier is a specialized solid-state amplifier engineered by Roger Sanders for driving demanding electrostatic speakers. It employs a massive output stage with 18 bipolar transistors per channel, each rated at 250W, enabling peak current delivery up to 135A and preventing current clipping at high frequencies common in ESLs. Operating at high voltage (±92V rail), it provides effortless, clear sound with low distortion and exceptional stability into reactive loads below 1 ohm. Originally priced at $2995 with a 5-year warranty, it features both balanced XLR and unbalanced RCA inputs, runs cool and silently without fans or protection circuits, and excels with planar magnetic speakers as well. Production has ceased, with designs continued by Sanders Sound Systems.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 360W @ 8Ω
- Power @ 4Ω
- 600W @ 4Ω
- Amplifier Class
- AB
- Damping Factor
- >600
- Minimum Impedance
- 1Ω
- Input Sensitivity
- 1.0V RMS
- Input Impedance
- 50Ω
- Max Input Voltage
- 92.0V RMS
Analog Output
Analog signal output specifications
- THD
- 0.080%
- SNR
- 100 dB
- Output Voltage
- 92.0V RMS
- Output Impedance
- 0.4Ω
- Max Output Voltage
- 92.0V RMS
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- RCA, XLR
- Analog Outputs
- Speaker binding posts
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 430 × 140 × 360 mm (W × H × D)
- Weight
- 18.5 kg (41 lbs)
Key Specifications
Power: 360W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions