NVA S150 Stereo Power Amplifier
Handmade in Great Britain, designed to be used with NVA passive pre-amplifiers. The S150 offers a taste of 'high end' performance at a price that is lower than many 'entry level' integrated amps. This exceptional value is achieved through our minimalist design ethos and modern distribution model.
The S150 can be upgraded to S300 specification, at any time, by paying just the difference. Read more
For operational stability this amplifier must only be used with NVA low capacitance speaker cable. Use of other makes of speaker cable will invalidate our warranty. For optimum sound quality, we recommend use of our low capacitance interconnect cables.
- Bespoke all-acrylic case with anodised aluminium heatsink
- New! High quality Toroidy transformers
- New! High quality Vishay capacitors
- Power Output - 60w
- Power Supply - 150va
- Dimensions - w240mm x h160mm x d240mm
"Many people talk about a ‘valve’ sound or a ‘solid state’ sound, because both have their advocates and both have their benefits. That doesn’t have to mean pleasant distortion or added emphasis, simply that some of the best valve amplifiers have a magic touch with vocals and some of the best solid state manage the same with bass, dynamics and transients. The NVA amplifiers seem to offer the best of both worlds". Richard Bowles review at The WAM Forum (read full review)
NVA sells, and ships, direct to users. This saves you around 40% compared to buying through a dealer. We are so confident in the quality of our products and designs that we offer a 30 day no quibble returns policy. Listen to NVA in your own system, in your own room (by far the best way to judge any item) for up to 30 days. If you’re not delighted, return it to us for a refund.
How it Works
First, you purchase the item(s). Once your order is delivered, the 30 day trial begins. To return the item(s) within that 30-day period, contact us by email. We will provide you with a return authorisation number (RMA). You then return the item(s) to us by your choice of courier. Alternatively, we can arrange to have the item(s) collected from you by DHL Express (UK only). Our collection service requires a minimum of 24 hours notice and the cost is £15 per box. Once we've received your return, you will receive a refund within 7 to 10 days.
The returned item(s) must be in the same condition that you received them in. If there are signs of user-related damage or missing accessories, then we may deduct a portion of the refund.
For full details, please see our Returns Policy
There are two main groups of power amplifiers in an NVA system:
- Stereo: Two channel amps - inc. S80, S150 & S300.
- Mono-block: Single channel amps (in matching pairs) - inc. M300 & M600.
P50 Pre-amp plus Single Stereo Power Amp
Stereo models are the most common and integrate power supply and two channels of amplification in a single unit. This set up forms the entry point into an NVA pre/power system with the P50 pre-amp and S80 power amp.
P50 Pre-amp plus mono-block power amps
Mono-block power amps are actually two boxes, and come in matched left / right pairs. Each channel is completely independent of the other, and results in less interference between left and right channels, giving better stereo imaging, but the greatest advantage is that each channel has its own power supply, or dual power supplies in the case of the M600. This results in greater dynamics and incite into the music.
The P50 preamp has three sets of outputs per channel, so we can support bi-amping (and also tri-amping for speakers with this capability).
For example, we can add the M300 or M600 mono-block power amps to a system that contains a single stereo power amp. Now our stereo power amp is driving just the tweeters, relieving it of the low frequency current needed to drive bass units. The result is lower distortion, more detail and sweetness. Each mono-block drives only a single bass unit and much less crossover. This results in much less inter-modulation giving better bass and mid-range.
If we already have mono-block amps, we can either add a stereo power amp to replicate the above system, or we can add a 2nd set of mono-block amps to give even greater performance.
Some multi-driver speakers have 3 sets of speaker terminals, allowing you to use separate amps for bass, midrange and treble units. The principles and benefits are the same as bi-amping.
When bi-amping is not possible
Not all speakers can be multi-amped, some have only a single pair of binding posts. In this case we can not obtain better sound with multi-amping. Instead we must simply use better amplifiers, for example a pair of M600 mono-blocks.
Multi-amping vs single amping
What's better? S150 + M300s or a single pair of M600s? If your speaker has a complex or high-order crossover, or has a uneven impedance curve (especially around the crossover point) then multi-amping is probably the better route to take. In fact, we would always recommend the multi-amp route for speakers with 3rd or 4th order crossovers, as each amplifier then 'sees' less crossover. If your speaker has simple (low-order) crossover networks, and even impedance curves, then we recommend either solution.
Typical upgrade path
Start with P50 preamp and a stereo power amp S80 / S150 / S300. If your speakers are below average sensitivity (<88db) and / or have a 3rd or 4th order crossover, choose the S150 or, even better, the S300. Buy the best interconnect and speaker cables you can afford.
Add a Balanced Mains Unit to supply your system. UK mains quality can be poor, so there's a very good chance you won't be hearing your system at it's full potential until you try our BMU.
Upgrade your P50 pre-amp to SA specification. We fit a superb 23 step Seiden switch with Audio Note load resistors. More transparency and detail.
Bi-amping - add a set of M300 or M600 mono-block power amps to drive your speakers bass units and use your existing S80 / S150 / S300 to drive the tweeters only. Better bass and midrange. More scale and resolution. Sweeter treble.
Upgrade interconnects and speaker cables with our Cable Trade-In Scheme.