Chord BerTTi Stereo Power Amplifier - Silver

Fifty-Five Watts, Built Like Nothing Else

The BerTTi is a Chord Electronics amplifier, which means it looks like no other component on the shelf and is engineered to match. Fifty-five watts into 8 ohms, from a chassis 235mm wide weighing 3.75kg.

The circuit is Chord's ULTIMA dual-feed-forward topology, taken from the company's reference amplifiers. Feed-forward error correction is an unusual approach, and it is why the numbers below look the way they do.

Frequency response runs from 5Hz to 100kHz, holding within half a decibel across all of it. That is a bandwidth most amplifiers many times this size and this price never manage to reach at all.

Inside the Chassis

Distortion measures 0.008% and signal-to-noise 87dB A-weighted. Chord trades the headline noise figure for its correction topology, and the very wide bandwidth is where the benefit of that trade actually shows itself.

Both a stereo pair of balanced XLRs and a stereo pair of gold-plated unbalanced RCAs are fitted, so the BerTTi takes a professional or a domestic source without needing an adapter of any kind.

It measures 59mm high, 235 wide and 256 deep, and weighs 3.75kg. Chord covers US-distributed product with a 5-year warranty, and that cover transfers with the product if you sell it on.

Who Is This Amplifier Best For?

• You want something you will actually look at — Chord builds its casework from machined aircraft-grade aluminum, and the BerTTi looks like nothing else you can put on a shelf at any price.
• Your speakers are efficient — fifty-five watts is plenty for a sensitive pair in a normal room, and the ULTIMA topology matters more here than raw output does.
• You care about bandwidth — 5Hz to 100kHz within half a decibel is wider than amplifiers many times this size manage, which keeps phase behavior tidy inside the range you hear.
• You might sell it one day — Chord's 5-year US warranty transfers with the product, which is unusual and worth real money at resale.
• You want separates — volume and input switching live in the preamp or streamer/DAC ahead of it; choose from our preamplifiers

How Does It Connect to Your System?

Connect your preamplifier by balanced XLR or unbalanced RCA. Speakers go to the outputs. At 235mm wide it sits comfortably beside another half-width component.

Keep the original packaging. Chord's warranty terms ask for it, along with the original receipt, if you ever need to make a claim.

Pairs Well With

Here are some great companions:

• Preamplifier: Required, and the natural next decision — see our Preamplifiers.
• Speaker Cables: Carry the current properly — see our Speaker Cables.
• Interconnects: Balanced XLR is the better run from preamp to amp — see our Interconnect Cables.
• Audio Rack: Give the amplifier a proper shelf — see our Audio Racks.

Frequently Asked Questions

How much power does it make?

55 watts into 8 ohms.

What is ULTIMA topology?

Chord's dual-feed-forward circuit with error correction, taken from the company's reference amplifiers. It is an unusual approach to keeping distortion low across a very wide bandwidth.

Does it take balanced inputs?

Yes. A stereo pair of balanced XLRs and a stereo pair of gold-plated unbalanced RCAs are both fitted.

How wide is the bandwidth?

5Hz to 100kHz within half a decibel, with distortion of 0.008% and signal-to-noise of 87dB A-weighted.

How big is it?

235mm wide, 256mm deep and 59mm high, weighing 3.75kg.

What warranty does it carry?

Five years on US-distributed product, and the cover is transferable. Keep the original receipt and packaging.

See It in Action

An introduction to the BerTTi and where it sits in Chord's range:

A hands-on test with a pair of loudspeakers:

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