Chord BERTTI
Image source — © Chord
What is it?
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Model name
BERTTI
Input sensitivity (mV)
780
Input impedance (balanced) (Ω)
100 000
Input impedance (single-ended) (Ω)
100 000
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Max current (A)
N/A
Output power (8Ω) (W)
75
Output power (4Ω) (W)
N/A
Gain (dBu)
30
Frequency response low +/- 3dB (Hz)
5
Frequency response high +/- 3dB (Hz)
100 000
Signal to Noise Ratio (dB)
87
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
0.008
Max power consumption (W)
240
Damping factor
N/A
Dimensions (mm)
590 x 235 x 256
Weight (kg)
3.75
Official link
Thanks to the use of an original low-distortion amplifier stage circuit and our patented horizontal field-effect MOSFETS, the Chord Electronics SPM 1050 MkII power amplifier is able to cope with the most "finicky" speaker systems. The electric power supply of the amplifier is provided by a 2-kilowatt high-frequency switching power supply unit, which uses a unique dynamic coupling scheme of bipolar power arms developed by us.
The compact analog amplifier Chord Alto features the proprietary ULTIMA amplification, which provides high-transparency sound with low distortion for both studio near-field monitors and headphones.
Chord Etude is the first sample of a new circuit concept, invented by the head of Chord Electronics, John Franks. Based on theoretical work on circuits with proactive forward communication instead of reverse — and Bob Cordell, the author of a textbook on amplifier circuit design, was a consultant to Chord Electronics on these issues — and ultrafast key power supplies, John Franks moved Chord amplifiers forward. Following the Etude, new circuit solutions are embodied in the ultra-expensive flagship amplifiers of the Ultima series. So, Chord Etude has lived up to expectations.
The output stage uses 32 MOSFET field-effect transistors in each channel, double-crystal, with a horizontal structure. These transistors are developed by Chord Electronics and are manufactured exclusively for ULTIMA amplifiers by a British manufacturer of microelectronic devices.
The ULTIMA 6 is the most compact stereo power amplifier in the Full Size series, introducing a new circuit design approach with proactive error correction using feedforward direct communication. The ULTIMA 6 offers 180 watts of perfectly pure output power and completely new ULTIMA circuit features to match the world's most advanced Chord Electronics DACs.