Audio T Verdict
The Naim CI-NAP 101 is a compact, rack-mountable mono power amplifier for professionally planned custom installations. Its combination of high-output low-impedance amplification and separate 70 V and 100 V line outputs makes it suitable for demanding passive subwoofers, integrated loudspeakers and distributed speaker systems.
This is one amplifier channel, not a stereo power amplifier. Its left and right RCA inputs are combined to mono, while the stereo RCA outputs allow the incoming line signal to be passed to another amplifier.
Correct output mode, speaker load, transformer-tap total, filter setting, ventilation and control method must be established before installation. The CI-NAP 101 should be specified and commissioned by an experienced custom-installation retailer or integrator.
Naim CI-NAP 101 Mono Power Amplifier
The CI-NAP 101 is the dedicated mono amplifier in Naim's CI Series. It is designed for discreet residential, commercial and marine installations where a single high-power channel, a passive subwoofer channel or a high-impedance loudspeaker circuit is required.
In low-impedance mode it is rated at 500W into 8 ohms and 800W into 4 ohms. Dedicated high-impedance outputs provide 150W on a 70 V line or 240W on a 100 V line, with galvanic isolation through toroidal audio transformers.
One Mono Channel
The two RCA input sockets do not represent two amplified channels. Left and right analogue signals are summed internally to feed one mono power-amplifier channel.
A conventional stereo system normally requires two CI-NAP 101 amplifiers, one for each channel. A single unit can instead power one passive subwoofer channel or one mono loudspeaker circuit.
Three Installation Applications
Low-Impedance Loudspeakers
- One mono amplifier channel
- 500W into 8 ohms
- 800W into 4 ohms
- Euroblock loudspeaker connection
- Suitable for compatible passive speakers and subwoofers
70 V Line System
- 150W rated high-impedance output
- For compatible 70 V transformer-equipped loudspeakers
- Selectable 50Hz or 120Hz high-pass response
- Supports planned parallel speaker distribution
- Transformer-tap total requires installer calculation
100 V Line System
- 240W rated high-impedance output
- For compatible 100 V transformer-equipped loudspeakers
- Selectable 50Hz or 120Hz high-pass response
- Suited to distributed speaker installations
- Requires correctly rated cable and professional commissioning
Low-Impedance Power
The low-impedance output is intended for conventional passive loudspeaker loads. With 500W available into 8 ohms and 800W into 4 ohms, the amplifier can provide substantial output from a single 1U chassis.
Power ratings alone do not establish compatibility. The loudspeaker's nominal and minimum impedance, sensitivity, continuous power handling and required sound-pressure level must be considered together. Audio T can help match the amplifier to the intended loudspeaker or subwoofer system.
The product description refers to demanding low-impedance applications, but Naim's published continuous-output specifications are stated at 8 ohms and 4 ohms. Any proposed load below 4 ohms should be approved for the exact installation rather than inferred from the headline power figures.
70 V and 100 V Loudspeaker Lines
High-impedance speaker systems allow multiple transformer-equipped loudspeakers to be connected along a distributed cable run. The CI-NAP 101 provides dedicated 70 V and 100 V Euroblock outputs so it can be used in the line standard appropriate to the project.
Only the selected output system should be used. A 70 V or 100 V line is not connected like a conventional 4-ohm or 8-ohm loudspeaker circuit, and ordinary passive speakers must not be connected directly unless they have the correct line transformer and tap setting.
The sum of all loudspeaker transformer taps must remain within the amplifier's available line power with suitable design margin. Cable type, route length, fire rating and local installation regulations must also be included in the project specification.
High-Voltage Speaker Outputs
A 70 V or 100 V loudspeaker line can carry hazardous voltage. Installation, termination and testing should be completed only by a competent person using components approved for the chosen line system.
Disconnect mains power before working on any input, output or trigger wiring. Never move a Euroblock connector between output modes while the amplifier is operating.
Selectable High-Pass Filter
In high-impedance operation, the CI-NAP 101 offers a selectable high-pass response at 50Hz or 120Hz. This can reduce low-frequency energy sent to distributed loudspeakers that are not intended to reproduce deep bass.
A high-pass filter is not a subwoofer crossover. When the amplifier is used with a passive subwoofer, the upstream audio-video processor, pre-amplifier or system controller must provide the required low-pass filtering, level alignment and any delay or room-correction settings.
Stereo RCA Input with Mono Summing
The analogue input consists of left and right RCA sockets with a published input impedance of 47 kilohms. The amplifier combines these inputs to mono, allowing both channels of a stereo source or processor feed to contribute to the single amplified output.
Where the upstream processor provides a dedicated mono subwoofer or zone output, the connection and summing arrangement should be confirmed during system design. Avoid using unapproved splitter or combining leads, as electrically joining source outputs can cause faults.
RCA Line Outputs for Daisy-Chaining
Stereo RCA line outputs allow the incoming analogue signal to be passed to another CI-NAP 101 or compatible downstream device. This supports systems that need several mono amplifiers to receive the same programme feed.
These RCA sockets are line-level connections and do not power loudspeakers. The number of devices that can be linked and the resulting source load should be checked for a large installation.
Level Control
A rear-panel level control allows the CI-NAP 101 to be balanced against other amplifier channels or adjusted for the loudspeaker zone it serves. It is an installation setting rather than a substitute for the system's everyday volume control.
Begin commissioning with the upstream level reduced. Set gain structure using appropriate test material and measurement, then secure normal volume control through the processor, streamer or automation system.
Music Sensing, Trigger and Instant-On Operation
The amplifier can detect an input signal and return to standby after 20 minutes without music. Its standby consumption is specified at 0.5W.
A wired trigger input and output support automated power control. Naim identifies the trigger connection as compatible with 5V to 12V signals, while the published specification lists 12V automation. The instant-on switch overrides both music sensing and trigger control when continuous operation is required.
Trigger voltage, polarity, connector wiring and control-system behaviour should be verified before connection. The trigger output may be used to pass the control state to another compatible component.
No Network Streaming or Direct App Control
The CI-NAP 101 is an analogue power amplifier without a network input or built-in music streamer. Its published connections are RCA audio, Euroblock loudspeaker outputs and wired automation.
App-based source selection and playback require a separate network component such as the CI-Uniti 102. The amplifier itself is controlled through signal sensing, wired trigger, instant-on operation and its standby button.
Compact 1U Rack Installation
At 44.5mm high, 440mm wide and 300mm deep, the CI-NAP 101 occupies 1U in a standard 19-inch equipment rack. Its 8.9kg weight, rear wiring, connector clearance and cable support must be allowed for in the rack design.
A temperature-controlled fan manages cooling, but ventilation openings and the fan path must remain unobstructed. Naim instructs installers to leave at least 5cm of ventilation space around the unit and limits operation to an ambient temperature between 5°C and 35°C.
Do not place the amplifier in a sealed cabinet without calculated airflow. Rack shelves, neighbouring heat sources and cable bundles should not block the ventilation path, and the installation must remain accessible for mains disconnection and servicing.
Universal Mains Supply
The universal power supply accepts 100V to 240V AC at 50Hz or 60Hz. Nominal power consumption is 100W, maximum consumption is 1500W and standby consumption is 0.5W.
The CI-NAP 101 is a Class I product and must be connected to a correctly earthed mains outlet using the supplied or approved mains lead. Circuit capacity, sequencing and power distribution should be planned for the maximum possible system demand rather than nominal consumption alone.
System Planning
A CI-NAP 101 can partner a CI-Uniti 102, an audio-video processor or another suitable analogue source component. The complete design must provide programme selection, volume control, bass management where required and the correct mono signal path.
For a passive-subwoofer system, confirm enclosure impedance, power handling, low-pass filtering and equalisation. For a 70 V or 100 V system, document every speaker tap, line load, cable route and zone level before commissioning.
Where several amplifiers are daisy-chained, also plan trigger sequencing, ventilation and mains capacity. Clear labelling of each amplifier, source feed, output mode and loudspeaker circuit will simplify future maintenance.
Key Features
- Single-channel mono power amplifier
- 500W into 8 ohms
- 800W into 4 ohms
- 150W for a compatible 70 V loudspeaker line
- 240W for a compatible 100 V loudspeaker line
- Stereo RCA inputs combined to mono
- Stereo RCA line outputs for daisy-chaining
- Euroblock loudspeaker outputs
- 50Hz or 120Hz high-pass response in high-impedance mode
- Rear-panel level control
- Music sensing with automatic standby after 20 minutes
- Wired trigger input and output
- Instant-on mode
- Temperature-controlled fan
- Universal 100V to 240V mains supply
- 1U 19-inch rack-mountable chassis
Technical Specifications
- Product type: Mono power amplifier
- Number of channels: One
- Power output into 8 ohms: 500W
- Power output into 4 ohms: 800W
- 70 V line output: 150W
- 100 V line output: 240W
- Analogue inputs: Stereo RCA, combined to mono
- Input impedance: 47 kilohms
- Line outputs: Stereo RCA for daisy-chaining
- Loudspeaker outputs: Low impedance, 70 V and 100 V Euroblock connections
- High-impedance isolation: Toroidal audio transformers
- Analogue gain: 29dB
- Total harmonic distortion and noise: Less than 0.008 percent at 1kHz
- Signal-to-noise ratio: 110dB, A-weighted
- Low-impedance frequency response: 3Hz to 70kHz at minus 3dB
- High-impedance frequency response: 50Hz or 120Hz to 25kHz at minus 3dB
- Level adjustment: Rear-panel level control
- Automatic standby: After 20 minutes without an input signal
- Wired automation: Trigger input and output, 5V to 12V compatible
- Cooling: Temperature-controlled fan
- Mains supply: 100V to 240V AC, plus or minus 10 percent, 50Hz or 60Hz
- Nominal power consumption: 100W
- Maximum power consumption: 1500W
- Standby consumption: 0.5W
- Rack format: 1U, 19-inch rack mount
- Dimensions: 44.5mm high by 440mm wide by 300mm deep
- Weight: 8.9kg
- Operating temperature: 5°C to 35°C
- Storage temperature: Minus 20°C to 60°C
- Minimum ventilation clearance: 5cm
Select and wire only the output mode appropriate to the loudspeaker system. High-impedance line design, low-impedance load calculation, ventilation, mains provision and system commissioning should be completed by a competent installer.
Frequently Asked Questions
Is the correct product name Nait CI-NAP 101?
No. The manufacturer name is Naim CI-NAP 101. NAIT is Naim's integrated-amplifier range and is not part of this model name.
Is the CI-NAP 101 a stereo amplifier?
No. It has one amplified mono channel. Its two RCA inputs receive left and right line signals and combine them to mono.
Do I need two units for stereo?
Yes, a conventional two-channel system normally requires one CI-NAP 101 for the left channel and one for the right, with an appropriate separate feed to each amplifier.
Can it power a passive subwoofer?
It can power a compatible passive subwoofer in low-impedance mode. The upstream processor must provide suitable low-pass filtering, level control and any required equalisation or delay.
Does it have a built-in subwoofer crossover?
No adjustable low-pass crossover is specified. Its selectable 50Hz or 120Hz filter is a high-pass function for high-impedance operation, not a subwoofer low-pass filter.
Can I connect ordinary speakers to the 70 V or 100 V outputs?
Not directly. Those outputs require compatible transformer-equipped line loudspeakers with correctly selected taps. Ordinary low-impedance speakers use the appropriate low-impedance output.
Can the low-impedance and line outputs be used together?
They should be treated as alternative operating modes. The installer must select and wire only the output system approved for the project.
What are the RCA outputs for?
They pass the stereo line-level signal to another compatible amplifier for daisy-chaining. They are not amplified loudspeaker outputs.
Can the Focal and Naim app stream directly to it?
No. The CI-NAP 101 has no network input or built-in streamer. App-based playback requires a separate network source such as the CI-Uniti 102.
How does it switch on automatically?
It supports music sensing and a wired trigger input. An instant-on switch can override both systems when continuous operation is required.
Does it require rack ventilation?
Yes. It has a temperature-controlled fan and Naim specifies at least 5cm of clearance around the product. The rack design must provide an unobstructed airflow path.
Can I install it myself?
A simple low-impedance system still requires correct load, wiring, ventilation and gain setup. A 70 V or 100 V line installation should be designed and commissioned by a competent custom installer.
Why Buy From Audio T?
- Correction and confirmation of the exact Naim CI model
- Low-impedance speaker and passive-subwoofer matching
- 70 V and 100 V line-system design guidance
- Transformer-tap and amplifier-load planning
- Advice on source summing, daisy-chaining and gain structure
- Trigger-control and system-automation checks
- Rack, ventilation and mains-capacity planning
- Support for Focal integrated-loudspeaker projects
Contact your local Audio T store
with the source, processor, loudspeaker models, required output mode, zone layout and rack details so the installation can be specified correctly.
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