Naim NAP 155 XS Power Amplifier

Naim NAP 155 XS Power Amplifier

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Naim NAP 155 XS Power Amplifier

The NAP 155 XS is the entry point into the separate power amplifier range from Naim, and forms the most cost effective of the XS models. Constructed from slimline alloy casework for electromagnetic screening and durability, the NAP155XS is the perfect match for the NAC155XS pre-amplifier.

The foundation of any quality power amplifier is the size and capacity of it's DC power supply - an amplifiers job is to modulate the power consumed from the mains supply in harmony with the audio input signal, so any deficiencies in the power supply area will compromise performance. The NAP155XS is built according to well established Naim practices with a very large toroidal transformer feeding dual bridge rectifiers and a bank of high capacitance reservoir capacitors, enabling the loudspeakers to draw large transient currents if necessary during musical peaks. The NAP155XS has separate transformer windings for both left and right hand power amp channels, as well as a separate winding and power supply to feed the NAP155XS pre-amp.

High current NPN output transistors run in class AB mode for both efficiency and linearity are bolted to a castellated aluminium heat sink for efficient heat removal, whilst additional thermal protection is provided to a case mounted thermistor which detects over temperature hazards and shuts the amplifier down if necessary. A symmetrical amplifier circuit with thermally tracked differential input pair transistors is very linear, producing very little distortion and high slew rate. Hum and noise are vanishingly low at all power output levels right up to 60W into 8 ohms.

On the rear panel is the mains on/off switch and fused IEC mains input, twin loudspeaker outputs accepting 4mm binding posts, a four pin DIN audio input and a 24V dc power output suitable for powering the NAC 155 XS.



Analogue Input  1 x 4-pin DIN 
 Input Impedance 18kΩ 
 Gain  +29dB
 Frequency Response -3dB at 3Hz - 50kHz 
Power Outputs   Naim pre-amplifier
 Minimum Load Impedance  
THD  0.013% 
 Signal-to-Noise Ratio  100dB
 Speaker Outputs  L & R, 4mm “banana” sockets
 Power Output 60W/channel, 8Ω 
 Transient 260VA 
Mains Supply 100V, 115V, 230V; 50 or 60Hz 
Power Consumption (quiescent) 16vA
Power Consumption 330VA (max.)
Dimensions (HxWxD) 70 x 432 x 301 mm
Weight 7.9kg

Providing your item is in stock, the order is usually dispatched within 24 hours. Please remember that postage and packing is completely free for orders over £50*. Out of stock items will be dispatched as soon as they become available, out of stock items can take between 4 to 21 days for dispatch.

Deliveries usually take 1-3 working days. The majority of orders are sent via our couriers'; Interlink Express on a next-day-delivery service. Smaller, low value or light-weight items are normally posted using Royal Mail Recorded or Royal Mail Special Delivery.

Once your product has been dispatched, you will be notified via email and sent a unique consignment number, you can use this number at to check the status of your delivery. If you have provided a mobile telephone number, Interlink's Predict service will notify you by text (and email) of a one-hour delivery window. If the window they suggest is inconvenient, you can change the date of delivery to a later one via text or email.

*We ship free of charge to mainland UK addresses, excluding the Scottish Highlands or 'Out-Of-Reach' Scottish locations. Please consult the post-codes below to see if your location falls within this category. If you are still unsure, please contact us on 01432 354921. We also ship to Northern Ireland, Channel Islands, Scilly Isles, Scottish Isles and Scottish Highlands, however delivery to these locations will incur a charge and can only be sent via a 2-day service.

Shipping CostsMainland UK (Next-Day)Offshore/Out-of-reach (2-day)Northern Ireland, Channel Islands, Isle of Man, Scottish Islands, Scilly IslandsRepublic of Ireland (2-day)
Under £50 Orders £7.50 £12.50 £15.00
Over £50 Orders FREE £19.99 £29.99
Surcharge Orders £50.00 £69.99 £79.99
Saturday Delivery £12.99 N/A N/A
Sunday Delivery £12.99 N/A N/A
Saturday by 12 Delivery £35 N/A N/A


Post codes exempt from the free delivery service include:

Scottish Highlands Post Codes: AB30-38, AB41-42, AB44-56, FK17-99, G83, IV1-28, IV30-39, IV52-54, IV63, KW1-14, PA21-33, PA34-40, PH15-26, PH31-41, PH49-50
Islands Post Codes: HS1-9, IV40-51, IV55-56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE1-3
Northern Ireland: All BT postcodes
Channel Islands Post Codes: JE, GY
Scilly Isles Post Codes: TR21, TR22, TR23, TR24, TR25

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