Audio T Verdict
The ATC P2 is a serious stereo power amplifier for demanding passive loudspeakers, larger rooms and systems where control, dynamic headroom and neutrality take priority over additional features.
Its true dual-mono construction delivers more than 300W per channel into 8 ohms with both channels operating. Separate power supplies, signal paths and return paths help minimise interaction between the left and right channels.
Balanced XLR and unbalanced RCA inputs make the P2 easy to partner with a suitable pre-amplifier, while its gain matching with the smaller ATC P1 allows the two models to be considered together in compatible multi-amplifier systems.
This is a power amplifier only, so source selection and listening volume must be controlled by a separate pre-amplifier or a suitable variable-output source.
ATC P2 Dual-Mono Stereo Power Amplifier
The ATC P2 is a high-output stereo power amplifier designed to drive challenging passive loudspeakers with control, clarity and generous dynamic headroom.
It produces more than 300W per channel into an 8-ohm load with both channels driven, doubling the stated output of the smaller
ATC P1 power amplifier
.
The P2 is particularly suited to larger listening rooms, lower-sensitivity loudspeakers and systems expected to reproduce wide musical dynamics without strain.
A Pre-Amplifier Is Required
The P2 does not provide source selection or a conventional listening-volume control. It must be partnered with a suitable pre-amplifier or source component offering a properly controlled variable output.
More Than 300W per Channel
ATC specifies a maximum continuous output of more than 300W per channel into 8 ohms at one percent total harmonic distortion, measured with both channels driven.
Measuring both channels simultaneously provides a meaningful indication of the amplifier’s ability to maintain its output during real stereo playback.
The additional power can help preserve control during demanding bass passages and musical peaks, particularly with speakers that present a difficult electrical load.
True Dual-Mono Construction
The left and right amplifier channels use separate power supplies, signal paths and return paths within the same enclosure.
This reduces interaction between the channels and allows the power demand from one speaker to have less influence on the output available to the other.
ATC specifies crosstalk of better than 100dB between 10Hz and 20kHz, supporting precise stereo separation and stable placement of instruments and voices.
Grounded-Source Class A/B Amplification
The P2 uses ATC’s discrete MOSFET grounded-source Class A/B output-stage design, developed alongside the amplification used within the company’s active loudspeakers.
Three pairs of MOSFET output devices are used per channel, supported by substantial low-noise power supplies and large passive heatsinks.
The design is intended to combine high output capability with wide bandwidth, low distortion and accurate transient response.
Low-Noise Power Supplies
Each channel has its own custom-made 400VA low-noise transformer.
Providing dedicated power supplies helps the P2 maintain its rated performance from both channels while reducing inter-channel modulation through the supply.
The amplifier can deliver peak current exceeding 15 amps under ATC’s stated conditions, helping it control demanding loudspeaker drive units.
Wide Bandwidth and Low Distortion
ATC specifies a frequency response extending from below 2Hz to beyond 400kHz at the stated minus 3dB points.
The unusually wide circuit bandwidth is intended to maintain accurate phase response and clean transient behaviour throughout the audible frequency range.
Total harmonic distortion is specified below 0.002 percent under ATC’s stated measurement conditions, with an A-weighted signal-to-noise figure exceeding 115dB.
Balanced XLR Inputs
A stereo pair of balanced female XLR inputs allows the P2 to connect to compatible pre-amplifiers and variable-output source components.
Balanced connections can be beneficial when using longer cable runs or installing the amplifier in an environment where electrical interference may be present.
Unbalanced RCA Inputs and Link Output
Conventional unbalanced RCA inputs allow the P2 to partner a wide range of stereo pre-amplifiers, music streamers and DACs with suitable variable outputs.
A stereo RCA link output passes the incoming signal onwards to another compatible power amplifier. This can simplify appropriate bi-amplified or tri-amplified systems.
The link output does not provide an independent volume setting, crossover or separate listening zone.
Gain Matched with the ATC P1
The P2 is gain matched with the 150W ATC P1, allowing the two amplifiers to be considered together where a compatible loudspeaker supports external bi-amplification.
For example, the P2 could provide greater power for the bass section while a P1 drives the midrange and high-frequency section.
Bi-Amplification Requires Correct Wiring
Only use separate amplifiers with loudspeakers specifically designed for external bi-amplification. Any terminal links must normally be removed before the amplifier outputs are connected.
Incorrect wiring can connect two amplifier outputs together and cause equipment damage.
Matching ATC Pre-Amplifiers
The
ATC CA2 Mk2
provides analogue source selection, volume control, MM and MC phono playback and headphone listening in a compact partnering pre-amplifier.
The reference
ATC SCA2
offers fully balanced outputs, additional source connections and a more substantial pre-amplifier platform for higher-level systems.
A compatible streamer or DAC with a genuine variable output may also be used, provided its output behaviour and connection requirements are fully understood.
Matching Passive Loudspeakers
The P2 is designed for larger rooms and loudspeakers that require substantial clean power or present a challenging load.
Suitable ATC partners include the
ATC SCM19
and
ATC SCM40
,
although amplifier matching should always consider the room, listening distance and desired playback level.
Read
Audio T Swansea’s ATC SCM40 review
for more information about the speaker’s performance and amplification requirements.
P1 or P2?
ATC P1
- More than 150W per channel into 8 ohms
- True dual-mono construction
- Suitable for many medium-sized rooms
- Balanced and unbalanced inputs
- 17.55kg cabinet
View the ATC P1
ATC P2
- More than 300W per channel into 8 ohms
- Larger dedicated power supplies
- Greater current and dynamic headroom
- Suited to larger rooms and difficult loads
- 23.35kg cabinet
Installation and Ventilation
The P2 weighs 23.35kg and should be placed on a rigid equipment support capable of carrying its weight safely.
Leave clear space around the amplifier and its heatsinks so heat can escape naturally. Avoid enclosed cupboards and do not place heat-sensitive equipment directly above it.
Connect the pre-amplifier and speakers with all equipment switched off, then begin listening with the pre-amplifier volume set low.
System Matching
Well Suited To
- ATC CA2 and SCA2 pre-amplifiers
- Large and demanding passive loudspeakers
- ATC SCM19 and SCM40 systems
- Larger listening rooms
- Longer listening distances
- Balanced or unbalanced analogue systems
- Compatible bi-amplified installations
Check Before Buying
- A pre-amplifier or variable output is required
- No source selection or volume control
- No phono stage, DAC or streaming
- The amplifier weighs 23.35kg
- Its heatsinks require clear ventilation
- Bi-amplification requires compatible speakers
Setup Guidance
- Switch off every component before connecting cables
- Use balanced or unbalanced inputs as appropriate
- Check speaker polarity carefully
- Begin with the pre-amplifier volume low
- Use stable, load-rated Hi-Fi furniture
- Keep the heatsinks unobstructed
Browse our range of
Hi-Fi amplifiers
,
passive loudspeakers
,
music streamers
,
digital-to-analogue converters
and
interconnects and speaker cables
, or explore the complete
ATC range at Audio T
.
Key Features
- High-output stereo power amplifier
- More than 300W per channel into 8 ohms
- Full output specified with both channels driven
- True dual-mono construction
- Separate 400VA low-noise transformer for each channel
- Three pairs of MOSFET output devices per channel
- Peak current output exceeding 15 amps
- Grounded-source Class A/B output stages
- Balanced stereo XLR inputs
- Unbalanced stereo RCA inputs
- Unbalanced stereo RCA link output
- Gain matched with the ATC P1
- Frequency response extending beyond 400kHz
- Low-vibration chassis with aluminium front panel
- Large passive heatsinks
- Hand built in the United Kingdom
- Six-year ATC warranty, subject to current terms
Frequently Asked Questions
How powerful is the ATC P2?
ATC specifies more than 300W per channel into 8 ohms with both channels driven.
Does the P2 include a volume control?
No. It requires a suitable pre-amplifier or source component with a properly controlled variable output.
Are the XLR inputs balanced?
Yes. The P2 provides one stereo pair of balanced female XLR inputs.
What is the RCA link output for?
It passes the incoming analogue signal to another compatible amplifier for an appropriate multi-amplifier installation.
Can the P2 be used with the ATC P1?
Yes. The P1 and P2 are gain matched for use in compatible externally bi-amplified or tri-amplified systems.
Which ATC pre-amplifier matches the P2?
The CA2 Mk2 provides a compact analogue option, while the SCA2 is ATC’s reference partnering pre-amplifier.
Does the P2 include digital inputs or streaming?
No. It is an analogue power amplifier with balanced XLR and unbalanced RCA inputs.
How large and heavy is the P2?
It measures 142mm high, 453mm wide and 338mm deep including its terminals, and weighs 23.35kg.
Why Buy From Audio T?
- ATC pre-amplifier and loudspeaker matching advice
- Comparison with the smaller ATC P1
- Balanced and unbalanced connection guidance
- Pre and power system demonstrations
- Loudspeaker power and impedance matching
- Bi-amplification and terminal-link guidance
- Interconnect and speaker-cable recommendations
- Equipment-support and ventilation advice
- System installation and setup assistance
- Ongoing upgrade support
Contact your local Audio T store
to discuss matching the ATC P2 with your pre-amplifier, loudspeakers and listening room.