Audio T Verdict
This Audio T listing is for a pair of Naim NAP 350 monoblock power amplifiers. Each amplifier drives one loudspeaker channel, so a conventional two-channel stereo system uses one NAP 350 for the left speaker and the other for the right.
Each fully regulated Class A/B monoblock is rated at 175W into 8O and 345W into 4O. A true balanced XLR input, Discrete Regulator supplies, Statement-derived NA009 output devices and substantial short-term current capability make the pair suitable for carefully matched, demanding passive loudspeakers.
The pair still requires a source, volume-controlled preamplifier, two equal speaker cables and passive loudspeakers. Each monoblock also needs its own mains connection, ventilation and stable equipment support.
Naim NAP 350 Monoblock Power Amplifiers - Pair
The NAP 350 is the monoblock power amplifier in Naim's New Classic 300 Series. Separating the left and right power-amplifier channels into individual full-width enclosures gives each channel its own transformer, regulated power supplies, input stage, output stage, heat sink and mains feed.
This product page and its stated price cover two NAP 350 amplifiers. One unit alone is a single audio channel and cannot drive a normal stereo pair of loudspeakers without a second matching monoblock.
Designed For
- Reference New Classic 300 Series stereo systems
- The Naim NAC 332 preamplifier
- Compatible balanced preamplifiers with XLR outputs
- Selected legacy Naim preamplifiers using the correct adaptor cables
- Demanding passive loudspeakers matched by impedance and sensitivity
- Systems requiring one dedicated amplifier chassis per channel
- Carefully planned multi-amplifier installations
Important Limitations
- The listing includes two monoblock amplifiers
- A separate volume-controlled preamplifier is required
- No streamer, DAC, phono stage or headphone output is built in
- Each monoblock needs its own mains socket and support position
- The pair weighs 33kg before cables and equipment shelves
- DIN or RCA preamplifiers require the correct adaptor cables
- The NPX 300 and 555 PS DR do not power the NAP 350
Two Monoblocks in This Package
A monoblock contains one amplifier channel. In this pair, one NAP 350 receives the preamplifier's left-channel signal and drives only the left loudspeaker, while the other receives the right-channel signal and drives only the right loudspeaker.
The two chassis are not bridged together and do not share a power supply. Each uses one XLR interconnect, one speaker cable and one mains lead. Channel assignment should remain consistent from the preamplifier output to the correct loudspeaker.
Pair Price, Not a Single Amplifier
The Audio T product title identifies this listing as a pair. The package therefore provides the two NAP 350 monoblocks required for stereo. References to an individual amplifier's output, weight, dimensions or accessories are per chassis unless explicitly described as a pair total.
175W into 8O from Each Monoblock
Each NAP 350 is rated at 175W into 8O at 0.1 percent THD+N, rising to 195W at the 1 percent distortion reference. The published 4O output is 345W at 1 percent THD+N.
Short-term specifications include 610W into 2O under Naim's stated burst test and a plus or minus 42A peak-current figure into 1O for 1ms. The associated 1.7kW value is peak test power intended to describe transient capability, not continuous output.
Fully Regulated Class A/B Architecture
Each NAP 350 is a pure Class A/B linear power amplifier operating from fully regulated Naim Discrete Regulator supplies. Separate regulated supplies serve the amplifier circuitry, including the balanced XLR input stage.
The design uses a newly developed high-current output stage with double drivers and paired power transistors. A triple-transistor constant-current source is used within the voltage-gain stage.
Eight NA009 Transistors per Chassis
Each monoblock contains eight Naim NA009 power transistors developed from the Statement programme. Four are used within the regulated power supplies and four within the output stage.
The devices are mounted on ceramic insulators to reduce capacitive coupling. Across this stereo pair, there are two complete and electrically independent sets of power-supply and output-stage hardware.
One Balanced XLR Input per Monoblock
Each NAP 350 has one true balanced XLR input with a published impedance of 47kO. The left and right XLR outputs of a NAC 332 or other compatible preamplifier connect to the corresponding left and right monoblocks.
One XLR-to-XLR balanced interconnect is supplied with each NAP 350. The Naim logo on the supplied XLR plug should face upwards when the connector is correctly inserted.
There Is No Input Selector
The XLR socket on each monoblock accepts one channel from the preamplifier. Source selection, channel balance and volume control all take place upstream. Connecting a fixed-level source directly can produce uncontrolled full output and must be avoided.
Legacy DIN and RCA Compatibility
Suitable adaptor cables allow the pair to work with compatible preamplifiers that provide DIN or RCA single-ended outputs. Naim publishes a 34kO input impedance when a single-ended legacy adaptor lead is used.
These adaptors are not the standard XLR-to-XLR leads supplied with the monoblocks. The preamplifier output configuration, pin assignments, channel routing and signal-ground arrangement should be confirmed before ordering cables.
No External Power-Supply Upgrade
Every NAP 350 contains its own audio and standby power supplies. There is no Burndy power-supply input, and neither the NPX 300 nor the 555 PS DR connects to the monoblocks.
An NPX 300 can upgrade compatible 300 Series source or preamplifier components such as the NAC 332, but it does not replace either NAP 350 mains connection. The monoblocks also provide no DC power output for a preamplifier.
Speaker Cable Requirements
Naim recommends NAC A5 or Super Lumina speaker cable, fitted in the correct direction. The two channel runs should be equal in length and connected with consistent positive and negative polarity.
Unlike some earlier Naim amplifier designs, the NAP 350 does not mandate a minimum speaker-cable length. The manual advises avoiding runs shorter than 2m and states a recommended maximum of 20m per channel.
No 3.5m Minimum for the NAP 350
The older 3.5m minimum often associated with Classic Naim power amplifiers should not be copied onto this product. For the NAP 350 pair, use equal runs, avoid sub-2m lengths and remain within the recommended 20m maximum unless Naim provides different project-specific guidance.
Naim Speaker Connectors
Each monoblock is supplied with one custom Naim loudspeaker connector pre-installed in its output socket. The connector provides the intended electrical interface and supports the amplifier's safety compliance.
Speaker cables are not included. Audio T can terminate the amplifier ends with the supplied Naim connectors and fit suitable loudspeaker-end plugs while maintaining equal cable lengths, direction and polarity.
Optical System Automation
Each NAP 350 includes an optical 3.5mm system-automation cable. With a compatible preamplifier such as the NAC 332, these connections synchronise power and Naim-logo brightness across both monoblocks.
The signal runs from Remote Out on the preamplifier to Remote In on each amplifier. Remote Out on a NAP 350 can pass control to additional compatible amplifiers where the system design requires it. Optical control avoids adding an electrical ground path between products.
Automatic Standby and Music Sensing
Auto Standby is the default setting. Each monoblock enters standby after 19 minutes without an input signal, where its consumption falls below 0.5W. Music sensing can wake it when a new input signal is detected.
The rear-panel Instant On setting keeps sensitive audio circuitry powered and disables automatic standby. Both amplifiers should be configured consistently so the stereo pair enters and leaves its operating states together.
Two Internal Supplies per Monoblock
A large toroidal transformer and linear supply serve the audio circuitry within each NAP 350. A separate efficient switch-mode supply enables the low standby-consumption figure.
Soft-start circuitry manages the initial current demand at power-up. Because the pair contains two substantial transformers, each amplifier needs a correctly rated mains connection and the two Power-Line Lite leads supplied with the pair.
Cooling and Ventilation
The NAP 350 uses aluminium-alloy heat sinks and fan-assisted thermal management. The fan is designed to activate when sustained high output raises the temperature, so the cooling system should not be described as unconditionally silent in every operating condition.
Keep every heat outlet unobstructed and do not place the monoblocks in a closed, unventilated cabinet. Never stack the two amplifiers directly on one another or on other Naim components.
Support, Weight and Placement
Each NAP 350 weighs 16.5kg, giving a combined amplifier weight of 33kg. Each chassis measures 91.5 x 432 x 317.5mm including its feet and needs its own stable equipment-support position.
A pair can be placed on separate Fraim levels or side by side with suitable spacing and support capacity. Keep the power amplifiers a reasonable distance from source and preamplifier circuitry to reduce possible magnetic interference or hum.
Logo Brightness, Reset and Service Port
Logo brightness can be controlled from a compatible preamplifier through system automation or adjusted locally at each NAP 350. The two units should be set together for consistent appearance.
Holding the rear brightness button for three seconds resets the amplifier, so normal brightness changes should use brief presses. The micro-USB connection is for service updates only and is not an audio input or charging socket.
System Switching Sequence
Make all XLR, automation and loudspeaker connections while every component is disconnected from mains power. Switch on sources, external source supplies and the preamplifier before powering the two NAP 350 amplifiers, with the volume turned down.
System automation can sequence the pair from a compatible Naim preamplifier. Otherwise, both monoblocks must be placed into or taken out of standby individually. Disconnect both from mains power before changing cables.
Supplied Accessories
Naim specifies the following with each NAP 350: one Power-Line Lite mains lead, one XLR-to-XLR balanced audio interconnect, one optical system-automation cable, one custom Naim speaker connector, documentation and a cleaning cloth.
As this Audio T listing contains two monoblocks, the stereo pair requires two sets of these unit-level accessories. Speaker cables, a preamplifier, source components, loudspeakers, legacy input adaptors and equipment supports are separate.
Key Features
- Pair of New Classic 300 Series monoblock power amplifiers
- One dedicated amplifier chassis per stereo channel
- Fully regulated Class A/B architecture
- 175W into 8O from each monoblock at 0.1 percent THD+N
- 345W into 4O from each monoblock at 1 percent THD+N
- 610W short-term burst rating into 2O
- Plus or minus 42A peak-current capability
- One true balanced XLR input per monoblock
- Eight Naim NA009 power transistors per chassis
- Optical system automation and automatic standby
- Heat-sink and fan-assisted thermal management
- One Power-Line Lite and balanced XLR cable supplied per monoblock
Frequently Asked Questions
Does this listing include one NAP 350 or two?
It includes a pair of NAP 350 monoblocks. That means two amplifier chassis, one for the left channel and one for the right channel.
Can one NAP 350 drive a stereo pair of speakers?
No. One NAP 350 is a single-channel amplifier and drives one loudspeaker. Two are required for conventional two-channel stereo.
Is the 175W rating for the pair?
No. Each monoblock provides 175W into 8O at the stated 0.1 percent THD+N reference. The pair provides one independently powered 175W channel to each loudspeaker.
Does each amplifier need mains power?
Yes. Every NAP 350 contains its own transformer and power supplies, so the stereo pair requires two mains connections.
Are the XLR cables included?
Naim supplies one XLR-to-XLR balanced interconnect with each monoblock, providing the two channel cables required for the pair. Legacy DIN or RCA adaptor cables are separate.
Does the pair include speaker cables?
No. Each monoblock includes its custom Naim speaker connector, but equal-length speaker cables and any loudspeaker-end plugs must be selected separately.
Does the NAP 350 require 3.5m speaker cables?
No. Naim advises equal lengths, avoiding runs below 2m and keeping within a recommended maximum of 20m per channel.
Can the NPX 300 power the NAP 350?
No. Each NAP 350 has its own internal supplies and mains lead. An NPX 300 can upgrade compatible source or preamplifier components, not the monoblocks.
Can the NAP 350 work with a non-Naim preamplifier?
Potentially. It requires a compatible volume-controlled output, with balanced XLR preferred. Output level, grounding, pin assignment and any single-ended adaptor must be confirmed before connection.
Is the cooling system completely silent?
The heat-sink and fan system is designed for quiet operation, but the fan can activate during sustained high-output use. Both amplifiers require clear ventilation.
Can the two amplifiers be stacked?
No. Each 16.5kg chassis should have its own stable, ventilated equipment-support position, with suitable spacing when placed side by side.
What does the automation cable control?
With a compatible Naim preamplifier, it synchronises standby operation and logo brightness. It carries control data rather than audio.
Why Buy From Audio T?
A NAP 350 pair requires careful channel assignment, two mains feeds, suitable loudspeaker matching and correctly terminated equal-length speaker cables. Audio T can verify every connection and calculate the required rack capacity before installation.
Your local store can also demonstrate the monoblocks with a NAC 332 and suitable loudspeakers, configure optical system automation, prepare NACA5 connections and plan ventilated Fraim support for the complete 33kg pair.
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