Krell DUO 300 XD
Image source — © Krell
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Model name
DUO 300 XD
Input sensitivity (mV)
2.4
Input impedance (balanced) (Ω)
200000
Input impedance (single-ended) (Ω)
100000
Output impedance (balanced) (Ω)
0.007
Output impedance (single-ended) (Ω)
0.007
Max current (A)
16
Output power (8Ω) (W)
2 x 300
Output power (4Ω) (W)
2 x 500
Gain (dBu)
26.2
Frequency response low +/- 3dB (Hz)
0.5
Frequency response high +/- 3dB (Hz)
100000
Signal to Noise Ratio (dB)
98
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
0.045
Max power consumption (W)
N/A
Damping factor
1140
Dimensions (mm)
434 x 194 x 536
Weight (kg)
36.4
Official link
The five-channel KRELL Chorus 5200 amplifier, using the new Krell iBias technology, ensures the operation of output amplification stages in pure class A at any output power, but with efficiency close to classes G and H. Class A differs from AB in the absence of switching distortion and, as a result, higher-quality sound.
The Krell DUO 175 XD weighs 31.8 kg, develops 2 x 175 watts at 8 ohms of load, has a signal-to-noise ratio of 115 dB and reaches a peak current of 13 A (the dumping factor of the amplifier is 210 units). The XD (Extended Dynamics, Xtended Dimensionality, Extended Detail) scheme provides excellent resolution over the entire spectrum of audible frequencies and brilliant dynamic characteristics.
The amplifier uses XD technology (lowering the output impedance for better control of speakers and more accurate music playback) and iBias technology (which allows you to combine Class A sound qualities with the dynamics of classic Krell amplifiers, as well as the efficiency and low power consumption of Class G and H amplifiers).
The KRELL KSA-i400 is capable of developing 400 watts when operating on a load with a nominal resistance of 8 ohms. For a 4 ohm load, the maximum power is doubled, and for a 2 ohm load, the amplifier is ready to reach 1.6 kW. When the load resistance drops to 1 ohm, the KRELL KSA-i400 is capable of delivering a peak current of up to 62 amperes. The amplifier implements the most advanced patented technologies of Krell iBias, XD and Sum-Max.