Audio T Verdict
The Nytech CPA402 is a compact dual-mono power amplifier designed for listeners who value musical communication, careful analogue engineering and long-term serviceability over an inflated feature list.
Although its rated output of 40W per channel into 8 ohms may appear modest beside many modern amplifiers, the figure doubles to 80W per channel into 4 ohms with both channels driven. This indicates a power supply designed to deliver useful current as the loudspeaker load becomes more demanding.
The CPA402 contains two substantially independent mono amplifier channels within one enclosure, including separate power-supply transformers. Only the common earth arrangement is shared, helping reduce interaction between the left and right channels.
It is the natural partner for Nytech's CP202 pre-amplifier, which provides source selection, volume control and coordinated power switching. RCA inputs also allow the CPA402 to work with other suitable pre-amplifiers, streamers and DACs with safe variable analogue outputs.
The three-pin XLR connections require a little explanation. They are not conventional balanced audio inputs. Nytech uses the XLR connector for an unbalanced signal and its remote power-control arrangement, allowing the CP202 to switch the power amplifier between operating and standby modes.
Audio T Cardiff has used the CP202 and CPA402 combination extensively when demonstrating and reviewing turntables, phono stages and loudspeakers. Its strengths lie in refinement, timing, stereo separation and its ability to make the musical performance feel coherent rather than simply impressive on paper.
The CPA402 will not suit anyone looking for built-in streaming, digital inputs, a phono stage or front-panel volume control. It is a focused analogue power amplifier that must be partnered and installed correctly. In the right system, that simplicity is precisely the point.
Nytech CPA402 Dual-Mono Power Amplifier
The Nytech CPA402 is a pure analogue stereo power amplifier, hand-built in South Wales and designed to partner the Nytech CP202 pre-amplifier.
It provides the speaker-level amplification required to drive a pair of passive loudspeakers, while source selection and listening volume are controlled by a separate pre-amplifier.
Its compact 218mm-wide enclosure contains two substantially independent mono power-amplifier channels, separate power-supply transformers and direct high-current loudspeaker connections.
A Pre-Amplifier Is Required
The CPA402 is a power amplifier rather than an integrated amplifier.
It does not contain source selection or a listening-volume control. It must be connected to the Nytech CP202 or another compatible pre-amplifier, streamer or DAC with a properly configured variable analogue output.
- No front-panel volume control
- No source selection
- No moving magnet or moving coil phono input
- No internal DAC
- No digital audio inputs
- No network music streaming
- No Bluetooth connection
- No headphone output
Dual-Mono Construction
The CPA402 is effectively built as two mono power amplifiers within a single enclosure.
The left and right channels use separate amplifier sections and separate power-supply transformers, with only the system earth arrangement shared between them.
This reduces the extent to which the electrical demands of one loudspeaker channel can affect the other.
Good channel independence can help preserve stereo positioning, image stability and the separation between instruments during complex musical passages.
40W Per Channel into 8 Ohms
The CPA402 delivers 40W RMS per channel into an 8-ohm loudspeaker load with both channels operating.
Power output should not be assessed in isolation. The loudspeaker's sensitivity, impedance curve, crossover design, room size and listening distance will all affect the practical result.
With a suitably sensitive loudspeaker in a normal domestic room, 40W can produce considerable listening levels and dynamic range.
80W Per Channel into 4 Ohms
Output rises to 80W RMS per channel into 4 ohms with both channels driven.
The doubling of rated power as the test load falls from 8 ohms to 4 ohms demonstrates the amplifier's ability to deliver additional current when required.
This can help the CPA402 maintain control where a loudspeaker's impedance falls below its nominal figure during demanding sections of music.
Power Output Is Only Part of Loudspeaker Matching
A loudspeaker labelled as 8 ohms may fall considerably below that figure at particular frequencies.
Audio T can help assess sensitivity, minimum impedance, room size and preferred listening level before recommending the CPA402 for a particular pair of loudspeakers.
Designed for Musical Coherence
Nytech's stated design priority is to allow the listener to concentrate on the performance rather than the equipment.
The CPA402 avoids unnecessary signal processing, digital control and additional circuitry. Its role is simply to take the pre-amplifier signal and provide the voltage and current required by the loudspeakers.
Audio T Cardiff has used the CP202 and CPA402 combination as a reference point when assessing a variety of turntables, phono stages and loudspeakers.
That experience has shown the pairing to be particularly effective at preserving musical timing, instrumental texture and the relationships between performers.
Pure Analogue Design
The CPA402 contains no digital signal processing, software platform, network module or app-based control.
Nytech uses traditional analogue circuitry and conventional wire-ended components selected for performance, reliability and future serviceability.
There are no firmware updates, online accounts or streaming services to configure.
Once connected to the pre-amplifier, loudspeakers and mains supply, the amplifier is intended to perform a single job consistently.
Hand-Built in South Wales
Nytech manufactures its current equipment in South Wales using a deliberately small-scale production process.
Each amplifier is assembled by skilled analogue electronics engineers rather than passing through a conventional high-volume assembly line.
The straightforward construction also allows the amplifier to be maintained and repaired rather than treated as a disposable sealed product.
Natural Partner for the Nytech CP202
The CPA402 was developed specifically to partner the Nytech CP202 pre-amplifier.
The CP202 provides source selection, listening-volume adjustment and a dedicated headphone amplifier. Its unbalanced analogue output is carried through three-pin XLR connectors designed to work with the CPA402's matching inputs.
The CP202 can also place compatible Nytech power amplifiers into standby from its front power control or remote handset.
Inserting headphones into the CP202 automatically mutes the connected Nytech power amplifier, preventing sound from continuing through the loudspeakers during private listening.
Unbalanced XLR Input Connections
The CPA402 provides a three-pin female XLR input for each channel.
These sockets do not carry a conventional balanced audio signal. Nytech uses the XLR connector for an unbalanced signal and the additional power-control function required by the CP202 and CPA402 system.
The audio input sensitivity is 0dBu, equivalent to approximately 0.775V RMS.
The XLR Inputs Are Not Conventionally Balanced
Do not assume that the CPA402 offers a fully balanced signal path simply because it uses XLR connectors.
Connection from a third-party balanced pre-amplifier may be possible with a correctly wired cable, but pin configuration and power-control behaviour must be understood before connection.
Speak to Audio T before ordering a cable for a non-Nytech pre-amplifier.
Nytech Power Control Through XLR
Nytech uses the XLR connection to carry both the audio signal and a control function.
Within the matching system, pin 2 can be connected to signal earth on pin 1 to control the CPA402's operating state.
This allows the CP202 to switch the CPA402 between normal operation and its low-consumption standby mode.
A special Nytech control cable is required for this arrangement.
RCA Analogue Inputs
Professional RCA input sockets are also provided for conventional third-party pre-amplifiers and variable-output sources.
This gives the CPA402 broader system compatibility without requiring the Nytech power-control connection.
Suitable sources may include:
- An analogue pre-amplifier
- A DAC with a safe variable analogue output
- A network streamer with pre-amplifier functionality
- A mixing or studio controller with an appropriate output
- A compatible integrated amplifier with a pre-amplifier output
Never Connect a Fixed-Level Source Directly
Most CD players, phono stages and conventional DACs provide a fixed-level output with no listening-volume control.
Connecting one directly to the CPA402 can produce full amplifier output and an extremely high sound level.
Confirm that the connected component offers a safe variable output before use.
0dBu Input Sensitivity
The CPA402 is designed to reach its intended output from a line-level input of approximately 0.775V RMS.
This closely matches the nominal output specification of the Nytech CP202.
A third-party pre-amplifier does not need to produce several volts to drive the CPA402 successfully, but its volume control should provide a smooth and usable adjustment range.
An unusually high-output source may make the system become loud very early in the volume-control travel.
Direct Loudspeaker Outputs
The main loudspeaker outputs connect directly to the left and right power-amplifier sections.
High-current 30A terminal posts accept several common cable terminations:
- 4mm banana plugs
- Spade connectors up to approximately 6mm
- Bare loudspeaker wire up to approximately 6mm
The connection should be tightened securely without excessive force.
Check Loudspeaker Polarity
Connect the positive amplifier terminal to the positive loudspeaker terminal and repeat the same arrangement for the negative connection.
Reversing one channel places the loudspeakers out of phase, weakening central imaging and often reducing bass impact.
Actiport Connection
The CPA402 also provides Nytech's Actiport loudspeaker connection through a locking four-pole Neutrik Speakon socket.
The connector carries the main loudspeaker outputs in a secure format designed to reduce wiring mistakes within a compatible Nytech active system.
It should not be treated as an ordinary additional speaker output or connected to unsupported equipment without the correct cable and system configuration.
Optional Active Crossover Capability
An internal connection allows a suitable two-way active crossover board to be installed.
With the appropriate crossover module, the CPA402 can operate as a two-way active loudspeaker monoblock, providing separate high-frequency and low-frequency amplifier feeds to a compatible active-capable loudspeaker.
A stereo active system would normally require two CPA402 amplifiers, with one amplifier assigned to each loudspeaker.
Active Operation Requires Specialist Configuration
The crossover board must be designed specifically for the connected loudspeaker and installed correctly.
Nytech describes its current active systems as being under continued development. Availability and loudspeaker compatibility must be confirmed with Audio T and Nytech before purchase.
Low Standby Consumption
The CPA402's standby consumption is specified at less than 0.3VA.
This allows the matching CP202 to place the amplifier into a low-consumption state when the system is not being used.
The amplifier can then return to operation through the Nytech control arrangement without requiring a separate switch on the standard front panel.
Special-Order Front Power Button
The standard CPA402 is designed around the coordinated power-control system used with the CP202.
Nytech can also supply a version with a front-panel power button by special order.
This may be useful when the CPA402 is being partnered with a third-party pre-amplifier that does not support Nytech's control connection.
Availability and production requirements should be confirmed when ordering.
Compact Half-Width Enclosure
The CPA402 is only 218mm wide, allowing the amplifier and matching CP202 to be placed side by side on a conventional equipment shelf where appropriate.
Its enclosure is 330mm deep including the rear sockets, so additional room must be allowed for the mains cable, interconnects and loudspeaker connections.
The amplifier weighs approximately 7kg, reflecting the two power-supply transformers and dual-mono internal construction.
Ventilation Requirements
Nytech recommends allowing at least 25mm of clear space on each side of the amplifier.
The CPA402 should be placed on a firm, level shelf with adequate airflow.
Do not cover the amplifier or install it in a tightly enclosed space where heat cannot escape.
Allow approximately 50mm to 75mm behind the enclosure for cable connectors and to prevent tight bends in the interconnects and loudspeaker cables.
Real-Wood Finish Options
The CPA402 is available with real-wood side panels that complement its black artificial-stone front panel and aluminium casework.
Welsh Walnut
A distinctive natural timber with considerable grain variation. Each pair of side panels will have its own character.
American Walnut
A darker and more traditional walnut finish that works particularly well with similarly finished loudspeakers and furniture.
Light Oak
A lighter natural finish suited to contemporary rooms and pale wood equipment racks.
Black Ash
A darker and more understated option that visually blends with black Hi-Fi components.
Other timber options may be possible by special order. Natural wood varies in colour and grain, so the supplied product will not be identical to every sample photograph.
CPA402 or an Integrated Amplifier?
Choose the CPA402 When
- You already own the Nytech CP202 or another suitable pre-amplifier
- You want separate pre-amplifier and power-amplifier components
- A dual-mono amplifier architecture is important
- You may upgrade the pre-amplifier separately in future
- You want Nytech's optional active-system upgrade path
- Compact half-width components suit the system
- Pure analogue and repairable construction are priorities
Choose an Integrated Amplifier When
- You want source selection and volume control in one enclosure
- You do not already own a suitable pre-amplifier
- A simpler one-box system is preferable
- You require built-in streaming or digital inputs
- You need an integrated phono stage
- Space for two separate components is limited
CPA402 or a Higher-Powered Amplifier?
Choose the CPA402 When
- The loudspeakers offer sensible sensitivity and impedance
- The system is used in a normal domestic room
- Musical timing and refinement matter more than headline wattage
- You prefer a compact dual-mono design
- You want a close system match with the CP202
- 40W into 8 ohms and 80W into 4 ohms provide sufficient headroom
Consider More Power When
- The loudspeakers have very low sensitivity
- The impedance falls to unusually demanding levels
- The listening room is particularly large
- Very high listening levels are routinely required
- The loudspeaker manufacturer specifies substantially more power
- The system must reproduce very large dynamic peaks at distance
System Matching
Well Suited To
- The Nytech CP202 pre-amplifier
- Compatible analogue pre-amplifiers
- Streamers and DACs with safe variable RCA outputs
- Many medium-sensitivity standmount loudspeakers
- Many medium-sensitivity floorstanding loudspeakers
- Pure analogue Hi-Fi systems
- Compact separate pre and power amplifier installations
- Potential Nytech active loudspeaker systems
Check Before Buying
- A suitable pre-amplifier is available
- The source output is genuinely variable
- The XLR cable is wired correctly for Nytech's unbalanced input
- Loudspeaker sensitivity and minimum impedance are appropriate
- The equipment shelf supports the 7kg weight
- At least 25mm ventilation is available on each side
- There is sufficient space behind the amplifier for cables
- Active-system compatibility has been confirmed where relevant
Connection and Setup Guidance
- Switch off the complete system before connecting or disconnecting the CPA402.
- Connect the amplifier only to a suitable pre-amplifier or safe variable-output source.
- Reduce the pre-amplifier volume before switching on.
- Use the matching Nytech XLR control cables with the CP202.
- Do not assume that the XLR inputs are conventionally balanced.
- Confirm third-party XLR cable wiring with Audio T before connection.
- Use the RCA inputs with a conventional unbalanced pre-amplifier output.
- Do not connect a fixed-level CD player, phono stage or DAC directly.
- Connect each loudspeaker with the correct positive and negative polarity.
- Ensure no loose wire strands can short the speaker terminals.
- Use the Actiport connection only within a correctly configured compatible system.
- Allow at least 25mm of free space on each side for ventilation.
- Allow approximately 50mm to 75mm behind the amplifier for cables.
- Place the amplifier on a rigid and level equipment shelf.
Nytech Products and Audio T Guides
These Audio T links provide useful product information, system examples and guidance about separate pre-amplifier and power-amplifier systems.
Key Features
- Pure analogue stereo power amplifier
- Dual-mono internal architecture
- Separate left and right amplifier sections
- Separate power-supply transformers
- Only the system earth shared between channels
- 40W RMS per channel into 8 ohms
- 80W RMS per channel into 4 ohms
- Both channels driven for rated power
- 0dBu or approximately 0.775V RMS input sensitivity
- Unbalanced three-pin XLR inputs
- Nytech remote power control through XLR
- Conventional RCA analogue inputs
- 30A direct loudspeaker terminal posts
- Compatible with 4mm banana plugs
- Compatible with suitable spade connectors
- Compatible with suitable bare loudspeaker wire
- Four-pole Neutrik Speakon Actiport connection
- Internal connection for an optional active crossover board
- Potential two-way active monoblock operation
- Low standby consumption below 0.3VA
- Special-order front-panel power control available
- Pure analogue circuit design
- Traditional wire-ended components
- Designed to be serviceable and repairable
- Hand-built in South Wales
- Compact 218mm-wide enclosure
- Real-wood side-panel options
- Welsh Walnut finish option
- American Walnut finish option
- Light Oak finish option
- Black Ash finish option
Frequently Asked Questions
What is the Nytech CPA402?
It is a pure analogue dual-mono stereo power amplifier designed to drive passive loudspeakers from a separate pre-amplifier.
Is it an integrated amplifier?
No. It has no source selector or listening-volume control.
Do I need a pre-amplifier?
Yes. The CPA402 must be connected to the Nytech CP202 or another suitable pre-amplifier or source with a safe variable analogue output.
How much power does it produce?
It delivers 40W RMS per channel into 8 ohms and 80W RMS per channel into 4 ohms, with both channels driven.
Is 40W enough?
That depends on the loudspeaker sensitivity, impedance, room size and listening level. Many suitable domestic loudspeakers can be driven very effectively with 40W.
Can it drive 4-ohm loudspeakers?
Yes. Nytech specifies 80W RMS per channel into a 4-ohm load with both channels driven.
Is it a dual-mono amplifier?
Yes. It uses separate mono amplifier sections and separate power-supply transformers within one enclosure.
Does it contain a DAC?
No. It accepts analogue audio signals only.
Does it have a phono stage?
No. A turntable requires a separate phono stage and pre-amplifier.
Can I connect a streamer directly?
Only when the streamer has a safe variable analogue output and can provide reliable volume control.
Can I connect a CD player directly?
Most CD players have fixed-level outputs and should not be connected directly. Use a suitable pre-amplifier unless the CD player provides a verified variable output.
Are the XLR inputs balanced?
No. The three-pin XLR sockets carry an unbalanced signal and support Nytech's power-control arrangement.
Can I use a balanced pre-amplifier?
Possibly, with a correctly wired cable. Ask Audio T to confirm the pin arrangement and suitability before connection.
Why does Nytech use XLR connectors?
The connector provides a secure audio connection and allows the matching CP202 to control the CPA402's standby state.
Does it have RCA inputs?
Yes. A stereo RCA input is provided for compatible third-party pre-amplifiers.
What is the input sensitivity?
The specified line-level sensitivity is 0dBu, equivalent to approximately 0.775V RMS.
Which speaker connectors can I use?
The terminal posts accept suitable 4mm banana plugs, spade connectors and bare loudspeaker wire.
What is Actiport?
Actiport is Nytech's four-pole locking Speakon loudspeaker connection for use within a compatible active loudspeaker system.
Can the CPA402 be used for active loudspeakers?
Potentially. An optional model-specific crossover board can convert it into a two-way active monoblock, but system compatibility and availability must be confirmed.
How many CPA402 amplifiers are required for a stereo active system?
A two-way stereo active arrangement would normally use one CPA402 for each loudspeaker.
Does it have a front power switch?
The standard version is intended to be controlled by the Nytech CP202. A front-button version may be available by special order.
How much power does it use in standby?
Standby consumption is specified at less than 0.3VA.
Does it need ventilation?
Yes. Nytech recommends leaving at least 25mm of clear space on each side.
Can I stack the CP202 directly on top?
The products are often shown together, but adequate ventilation and a stable support should be maintained. Side-by-side placement may be preferable where shelf space allows.
What are the dimensions?
It measures 218mm wide, 330mm deep including the rear sockets and 90mm high including the feet.
How much space is required behind it?
Allow approximately 50mm to 75mm behind the amplifier for the mains cable, interconnects and loudspeaker connectors.
How much does it weigh?
The amplifier weighs approximately 7kg outside its packaging.
Which finishes are available?
Nytech currently lists Welsh Walnut, American Walnut, Light Oak and Black Ash. Other wood options may be possible by special order.
Where is it made?
It is hand-built by Nytech Audio in South Wales.
Can it be repaired?
Nytech designs its current analogue products to be serviceable and supported over the long term.
Where can I hear it?
Audio T Cardiff can arrange demonstrations of Nytech equipment with suitable sources and loudspeakers.
Why Buy From Audio T?
- Nytech demonstrations at Audio T Cardiff
- Extensive experience with the CP202 and CPA402 combination
- Advice matching the amplifier to suitable loudspeakers
- Loudspeaker sensitivity and impedance checks
- Nytech XLR cable and power-control guidance
- RCA connection advice for third-party pre-amplifiers
- Safe variable-output configuration
- Interconnect and loudspeaker cable matching
- Equipment placement and ventilation advice
- Guidance about Actiport and optional active operation
- Finish and special-order timber advice
- Direct comparison with suitable integrated amplifiers
- Home demonstrations may be available by arrangement
- Part exchange may be available on suitable existing equipment
- Ongoing setup and system support
Contact Audio T Cardiff to arrange a demonstration or discuss matching the Nytech CPA402 to your pre-amplifier and loudspeakers.