Evolution 403e vs Evo2250e
The Evo2250e's power @ 8ω is 250W against the Evolution 403e's 400W, its power @ 4ω 500W against 800W, and its output impedance 0.06Ω against 0.055Ω. Both share damping factor (>100).
AI-generated product photo — not official manufacturer imagery.
AmplifiersPower AmplifiersMultichannel AmplifiersDiscontinued
About the Evolution 403e
The Krell Evolution 403e is a three-channel power amplifier rated at 400 watts per channel into 8 ohms and 800 watts per channel into 4 ohms. It uses Krell’s Active Cascode and Current Mode topologies, together with Evolution CAST circuitry, and provides balanced XLR, single-ended RCA, and CAST inputs for each channel. Outputs are provided through Krell binding posts. The amplifier has a 6,000 VA power supply using two 3,000 VA transformers and 188,000 µF of filter capacitance, with a 100 V/µs slew rate, output impedance below 0.055 ohms at 20 Hz, and a damping factor greater than 145 at 20 Hz and 125 across 20 Hz–20 kHz. It measures 17.3 × 9.8 × 26.1 inches (W × H × D) and weighs approximately 190 pounds (86.2 kg). It is intended for demanding high-end multichannel music and home-theater systems.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 400W @ 8Ω
- Power @ 4Ω
- 800W @ 4Ω
- Amplifier Class
- AB
- Damping Factor
- >100
- Minimum Impedance
- 4Ω
Analog Output
Analog signal output specifications
- Output Voltage
- 57.0V RMS
- Output Impedance
- 0.055Ω
- Max Output Voltage
- 160.0V RMS
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- XLR, RCA, CAST
- Analog Outputs
- Krell binding posts
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 438 × 248 × 662 mm (W × H × D)
- Weight
- 79.2 kg (175 lbs)
Key Specifications
Power: 400W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions