Chapter Precis 250S Integrated Amplifier

Retail $9,995 CAD

(with Nevo remote)

Silver or black finish

Contact us for sale price

Product Manual

Brochure

The Chapter Précis Integrated amplifier is a new ‘state of the art’ audiophile two-channel line stage integrated amplifier. The Chapter Précis is the integration of key aspects of the award winning Couplet Power amplifier and Preface Plus pre-amplifier. Hence its name, Précis - ‘an abridged version of the original work...’

Our objective is to provide a product capable of great musicality and realism whilst boasting exemplary technical specifications. By bringing together engineers and designers with a lifetimes experience in audio and power systems design we believe this objective has been more than achieved. The Chapter Précis is able to handle all of today’s high-resolution sources, with the fidelity that you would expect of any Chapter product.

Our goal, as always, is to produce a true reference quality integrated amplifier. A product that can be held in the highest regard from both objective and subjective perspectives.

After several years of research and development, we believe that we have succeeded in fulfilling the requirements of even the most discerning audiophile.

Design Features

Finest Part Selection: The Précis uses our own semi-discrete input and output stages. The electrolytic capacitors are all ultra low ESR Panasonic Gold series, with bulk energy storage courtesy of a bank of High quality, low ESR Samwha caps. These are Custom made by Samwha for Chapter. On the power supply we use the finest sounding discrete regulators in the preamplifier section and our own custom screened mains transformer. At Chapter we also use the finest full immersion gold Printed Circuit Boards with 3oz copper weight and ‘Melf’ surface mount precision resistors.

Wide bandwidth: This is important in preserving the vital H.F. phase information essential to stereo sound staging and realism. The pre amp stage was designed specifically for its speed of response, further improved by a high-speed differential input stage. Frequency compensation of the integrated amplifier is achieved in such a way as to allow excellent phase and gain margin into complex amplifier loads without compromising high frequency phase or power bandwidth.

Balanced ground layout: Cancels the ground currents that can cause Inter-modulation distortion and crosstalk in a conventional stereo design.

Full Immersion Gold Printed Circuit Boards: Audio signals travel on gold track. As you would imagine, compared to copper, full immersion gold is very expensive to manufacture, but the sonic benefits are hugely tangible in terms of space, air and dynamics.

Custom Designed Differential Volume Control: At Chapter we auditioned many different volume pots, all of which had their own traits. Instead of designing electronics to counter the sonic signature of any particular pot, we have designed our own, using a series of precision resistors and relays. This gives us unprecedented levels of resolution with complete volume repeatability.

Unique D Class Amplifier stage: Delivering 225 watts into 8 ohms and 450 Watts into 4 Ohms, the unique self oscillating design, is free from load dependency and has a THD signature that does not alter with frequency within the audio band, so whatever the load and whatever the level, your Précis amplifier will deliver stunning audio quality, guaranteed.

Specifications

Output Power:  225 Watts into 8 ohms, 450 watts into 4 ohms RMS both channels driven

THD + N:  Less than 0.01% at 1KHz. 22Hz to 22KHz bandwidth

IM Distortion:  Better than -80dB (19+20KHz dual tone test - 1 KHz product at 50W output into 4 ohms

Signal to Noise:  Better than -120dB (22Hz to 22KHz bandwidth).

Frequency response:  DC to 48KHz +0 - 3dB

Cross talk (channel to channel):  -100dBv below 50KHz

Cross talk (Pre amp stage):  -100dB at 1KHz, -90dB at 20KHz, -90dB at 100KHz 1V RMS Input

Common mode rejection ratio:  Less than -90dB (1kHz @ 0dBV)

Gain range Minimum to maximum

-86dB to +12dB (Pre-amp output)

-86dB to +38dB (Amplifier output)

Audio inputs

Impedance (unbalanced) 47K Ohms

Impedance (balanced) 94K Ohms

Audio outputs

Pre amplifier stage - Balanced Less than 20 Ohms.

Power amplifier stage Less than 0.04 ohms.

Input sockets

One pair of XLR for balanced line operation

4 pairs of RCA Phono for single ended operation

Output sockets

1 Pair of XLR for Balanced Line operation.

1 pair of RCA for Unbalanced Tape Loop operation.

1 Pair of WBT speaker binding posts per channel

Finish Fully bead blasted, anodized aluminum alloy casework.

Power on/off Switch and indicator. IEC mains input socket .

Weight Approx. 25 Kg

Size 390 x108 x300 mm (WxHxD) approx.

Note: Although the information given is in good faith, Chapter Electronics reserves the right to

improve specifications and details without notice.