Q Acoustics Concept 500 floorstanding speakers

What happens when a successful entry-level speaker brand goes upmarket? HFC finds out

It is hard to believe that it is now over a decade since Q Acoustics first began selling speakers. As a brand developed under the banner of Armour Home Electronics in 2006, it has successfully managed to swiftly migrate from newcomer to become the new benchmark for entry-level speakers (see our Group Test starting on p24). Even when it pushed its designs slightly upmarket with the arrival of its first Concept models in 2014, it delivered speakers that remain some of the best at their price points today. With barely any speaker markets left to conquer under £1,000, it was inevitable that eventually the brand would move more upmarket.

Instead of moving up just one increment, the Concept 500 pitches into more rarefied territory altogether. A long time in development has resulted in an extremely sophisticated loudspeaker that’s still undeniably a Q Acoustics product. This has meant taking technologies and design features recognisable on its lower-cost models and developing them more for the upmarket sector.

Nowhere is this more apparent than the cabinet design. The Concept 500 takes the ‘Gelcore’ (see boxout) system first seen on its Concept 20 and 40 models and runs with it. Whereas the more affordable 20 and 40 limited its application to the vertical sides of the cabinet, the Concept 500 uses it on every surface including the top and bottom. Furthermore, instead of the two layers of MDF with a single layer of gel, here it is beefed up with three layers of MDF and two layers of gel. The result is a speaker that promises a level of rigidity and damping that is way beyond more conventional cabinet construction arrangements.

The cabinet boasts extensive internal bracing, calculated in order to ensure the maximum effectiveness. Q Acoustics refers to it as “point-to-point bracing” meaning that stiffening is only applied between the relevant points rather than at locations convenient to the manufacturer. There is also a series of Helmholtz resonators fitted to reduce stray energy emission. This is an exhaustively engineered and immensely solid enclosure.

The drivers are also true to the company’s ethos and outwardly look very similar to those used in its more affordable speakers. A 28mm soft dome tweeter is joined by a pair of 165mm mid/bass drivers in a woofer/tweeter/woofer layout that is visually almost identical to the much more affordable 3050 floorstander (HFC 398). The mid/bass units boast a significantly beefed up voice coil and considerable attention has been paid to isolating them, while the tweeter is completely decoupled from the cabinet. This extends to all drivers being mounted to the reverse of the front panel and results in all fastenings being invisible.

Sound of silence
During development, the drop in noise from the cabinet revealed that notionally silent components in the crossover became audible in the absence of noise from elsewhere. A full re-work of the crossover was the result, with components that drop the noise levels to Q Acoustics’ and design consultant Karl-Heinz Fink’s satisfaction. Even judged by the standards of a £4,000 loudspeaker, the attention to detail that’s on show here is impressively fastidious.

It also looks the business, too. The industrial design manages to look about right at the price while keeping a family resemblance to its more affordable Concept siblings. Two features in particular help it to carry this off. The decision to blend a lacquered cabinet finish with a real-wood inlay section at the rear is very eye catching indeed. The wooden section lightens what would otherwise be a fairly dark and oppressive-looking floorstander (finished in black gloss) and is a rich, distinctive style twist. The other is the chrome foot section, which adds stability to the speaker and provides a little extra point of detail. The build quality is excellent and even the slightly prosaic grilles are smart.

Tweeter output can be adjusted to better work in the space in question as can bass output. There’s a sizeable bass reflex port at the rear, which can be tweaked for the amount of bass output via a large two-piece bung. When both sections are used, the port is almost completely blanked off but removing the centre section allows for a degree of flow through.

Sound quality
Connected to a Naim Supernait 2 and Naim ND5 XS network audio player (HFC 352), I find that leaving the treble output flat and keeping the outer section of the foam bung in place in the bass reflex rear port yields the best results in my listening room. After a little time living with the Concept 500, it becomes clear that the extensive work on the cabinet has produced a floorstander that sounds like six beautifully integrated drivers suspended in free space.

The lack of colouration makes well-recorded material sound startlingly immediate. A 16/44.1 rip of David Gilmour’s This Heaven rises from complete silence and generates a soundstage that is solid, three dimensional and filled with instruments that have nigh-on perfectly tonality. When Gilmour’s vocals arrive, they are locked centre stage between the speakers and are so believably real that you realise that what you previously thought was pretty accurate reproduction was some way wide of the mark.

This realism is aided in no small part by the extremely effective integration across the frequency response. Even when provoked with the less than stellar recording of Foo Fighters’ album One By One, it remains exceptionally balanced and refined. This makes it extremely easy to listen to for long periods and while it shines with high-resolution material – a 24/96 file of Craig Armstrong’s Crash is simply superb – what is more notable is the level of performance it brings to less polished productions.

This transparency means that it will reproduce any harshness or aggression further up the audio chain, but partnered with any sensitivity this is an impressively forgiving speaker. It won’t be a magic bullet to improve a poor system, because it’s highly likely that the failings you are trying to deal with will instead become even more apparent. This is hardly the fault of the Concept 500, but it is certainly something that it’s important to take into consideration. While you need to think about the sonic presentation of any partnering equipment you team it up with, the good news is that you won’t need to have huge reserves of power to hand. Rated at 90dB, the sensitivity is usefully high and although impedance dips to a minimum of 3.7ohm, nothing during my time with it suggests that this is in any way a difficult speaker to drive.

It has no difficulty in demonstrating enormous scale when required. Switching to vinyl via a Roksan Radius 7 (HFC 423) and spinning the newly released Catalog boxset from Kraftwerk, the Concept 500 is a fabulous partner. The sheer depth and impact it brings to the new mix of Aero Dynamic is utterly addictive. Q Acoustics quotes a roll-off at 41Hz, but in a normal lounge – even with the bungs in place – I suspect it goes quite a bit lower than that, and with the same effortless lack of boxiness and colouration as the upper registers. Even very deep, fast basslines don’t seem to result in any bloat or overhang, and provided that some attention is given to its positioning in the room, it remains fast yet controlled at all times.

Perhaps most importantly, the Concept 500’s proficiency doesn’t get in the way of its ability to have fun. Listening to the joyous Waste A Moment by The Kings Of Leon, I notice the wonderful interplay between the Followill brothers and that superbly natural tone with the instruments and vocals, but more than anything else there’s an infectious level of enjoyment. There’s a simple sense of joy that stems from the presentation being so unadorned. The beauty of this is that music doesn’t need to be especially ballistic for it to make itself felt and the slow, simple Blues of RL Burnside’s Too Bad Jim has a joyous playfulness and infectious sense of timing.

This is an outstanding speaker that shows an all-round depth of talent that would be impressive even if the price were considerably higher. Its ability to remain transparent so that you can simply get on with enjoying the music is something that Q Acoustics can be very proud of, as it redefines expectations at the price. It’s comparatively unfussy about its environment or the electronics that integrate with it as part of a system and should be top of any shortlist if you’re looking to spend £4k on a floorstander. ES

Product: Q Acoustics Concept 500
Price: £4,000
Origin: UK/China
Type: 2-way floorstanding loudspeaker
Weight: 42kg
Dimensions (WxHxD): 400 x 1,150 x 350mm

● 28mm soft-dome tweeter
● 2x 165mm mid/bass driver
● Quoted sensitivity: 90dB 1W/1m (6ohm)

Distributor: Armour Home Electronics
Telephone: 01279 501111
Website: qacoustics.co.uk

Read the full review in HFC 427