Boasting 35 watts per channel, the AXA35 is 40% more powerful than the smaller AXA25. This not only means it’s better at filling larger rooms but also in delivering a richer, more dynamic sound at lower volumes. Covering the history of Cambridge Audio and the evolution of its budget offerings would serve only to prematurely wear the keys of my already battered keyboard. If you’re interested, I wrote on the subject at length in my AX series summary. If you’re not, the review herein is strictly dedicated to the AXA35 amplifier and will also detail the AXA25. On paper the two amplifiers are very similar with only a 10W jump in output power and specification improvements setting them apart, but in practice they are two very different amplifiers. The AXA25 is a very indirect successor to the A1 and to an extent my A5, whereas the AXA35 is cut from the same cloth as the proceeding Topaz AM10 and the Topaz receivers.

The AXR100 mostly mirrors its brother's spec sheet, building on it with a 100-watt output as well as twin optical and single coaxial inputs. The rest of this review focuses on the AXA35 exclusively as I don’t have an aXA25 for comparison. The AXA35 has plenty of useful facilities for a budget amplifier in the contexts of an aptly specified hi-fi system. When compared against a 2004 era Cambridge A5, years of inflation and cost prioritisation mean the omission of a preamplifier output and the second pair of speaker outputs for bi-wiring, not that bi-wiring offers any real-world advantage. There’s no true tape monitor in the newer amps either, nor an option to bypass the tone controls. You do get a remote though, which the A5 didn’t have.

The preamp appears similar if not identical to the AM10. It is responsible for most of the noise in the amp’s output – 79.8dB signal to noise ratio (A-wtd, ref 0dBW). It’s a bit of a shame Cambridge didn’t spec up the preamp a bit to better match the performance of the output stage. Nevertheless it is well designed with NE5532s unsurprisingly making up the basis of its audio circuitry and input selection and volume control handled by digital logic.

The frequency response is relatively flat. There’s a gentle roll-off below 100Hz and above 10kHz, but it’s only 0.2dB down at 20Hz and 20kHz, the limits of the audio band. In reality this won’t be audible, so any characteristic sound will be due to its limitations in power, component-level tuning and preamplifier noise more than anything else. Having said that, the AXA35 arguably sounds clearer and has a more neutral tonal balance, doing more than enough to justify a five-star rating at this price point. It looks and sounds the part, and if this is just a hint of what the rest of the Cambridge Audio’s AX range has to offer, we’re in for a sonic treat. One of the key differentiators is the user interface. The AXA25 has old-fashioned analogue knobs for bass, treble, volume and balance. I presume that it is a fully analogue component design, though I don’t have one here so I can’t lift the lid to say for sure. The AXA35 has a digital interface as evidenced by the push-button input selection and digitally-controlled volume, complete with volume level display and tone and balance controls hidden behind a simple menu system. Assuming I’m right about the AXA25’s implementation of good old-fashioned potentiometers, the better AXA35 should be a significant jump in performance without the channel mismatch and noise issues associated with cheaper analogue pots. Speaking of the tone controls. They are of the shelving type and cut and boost at 100Hz and 10kHz respectively. They’re not subtle as a result, but as this amp is likely to be paired with smaller bookshelf speakers or less capable floorstanders they will be more useful than controls that adjust the 20Hz and 20kHz frequency extremes. Cambridge do not give a spec into a 4Ω load, which is unsurprising given that the power supply isn’t built to drive difficult or low impedance loads. Larger reservoir caps, for example, would have given the AXA35 a significant bump in headroom and a bit more grunt. It’s not uncommon to see 4700UF caps as a minimum on the PSU rails of a DIY-built Gainclone. You could up the voltage too – the LM3886 can handle peak input voltages of +/-94V, and comfortably up to +/-40V with ample cooling, which the AXA35 certainly provides.

I can’t help but feel it could have been better engineered in places too. A bigger power supply would vastly improve the performance of the amplifier, and a better preamp would give the amplifier a chance to show what it is really capable of. Neither are difficult to design, and neither should add significant component cost to the product. If you’re competent in electronics and DIY-minded though, the older AM10 and the AXA35 are perfect candidates to form the basis of a DIY Gainclone.

There’s a shortage of high-quality hi-fi electronics at the budget end of the market, so it’s good to see Cambridge Audio produce an amplifier with the musicality and all-round appeal of the AXA35. Naturally for a receiver, the 85-watt AXR85 has FM/AM tuners, which is bolstered by a built-in Bluetooth receiver, three analogue RCA inputs, a phono stage and a 3.5mm aux input. Recording, subwoofer and 6.3mm headphone outputs are correct and present too. More uniquely at this price, the AXR85 boasts two zones for driving two pairs of speakers simultaneously. Otherwise the amps are functionally similar, broadly speaking. One reviewer referenced past Cambridge amps as having “something of the biscuit tin about them” with “casework that wasn’t what you’d call well-damped”. Neither comment I feel is justified based on my experience with multiple iterations of the A1, the A5, early CD players and the first models in the Azur range.Pressing the power button brings the amp out of standby and, after a few seconds, the speakers are connected with the clunk of a substantial relay. I was surprised to learn that, just like the AM10, the AXA35 doesn’t remember the previous volume setting when the power is cycled. It does remember the settings for balance, bass and treble, so this is a daft omission on Cambridge’s part. The AXA35 has plenty of power to fill a mid-sized room providing you’re using efficient speakers. Most budget amps of the ‘70s and ‘80s were this way, and they survived many a party. The A1, the amplifier that revived the Cambridge brand after the Audio Partnership takeover, was only 25 watts per channel and it can make a lot of noise with the right speakers. A Marantz PM6006 UK Edition will get you greater subtlety and refinement and it can also be partnered with more expensive speakers. Perhaps not surprising considering it is a little more expensive – and it started life a fair chunk more expensive. It’s true to say that the new casework is better, but examples of poorly damped biscuit-tin casework are more prevalent in boutique British equipment at several times the price of any Cambridge. Poorly built casework and preschool electronics design aside, some of that gear is ugly enough to offend a blind man’s sense of aestheticism. As well as being more powerful, the AXA35 also improves internal component quality, giving improved sonic detail and realism with less distortion. The toroidal power transformer and separate pre/power amp circuit boards are features usually only found in much more expensive amplifiers, making the AXA35 something of a giant-slayer.

With revised cabinet bracing, the distinctive Q Acoustics cabinets have been made even better. With reduced cabinet resonance, the sound becomes less coloured and truer to how it sounded in the studio/concert venue. Uprated audiophile grade crossover components improve the transparency of sound still further. Prices valid in stores (all including VAT) until close of business on 28th November 2023. (Some of these web prices are cheaper than in-store, so please mention that you've seen these offers online.)

Yet another top class budget standmount from Q Acoustics. It delivers a fabulous sound for the money." 'What Hi-Fi? Sound & Vision magazine'. 5-star review. The woofer units are carefully designed to balance clear, articulate mid-range with powerful bass. The multifibre cones are attached to the chassis by fluted rubber surrounds. These effectively damp unwanted resonances, making the speakers sound exceptionally smooth and life-like.