As with the latest A3 hatch, the new cabriolet is based on the Volkswagen Group's modular MQB platform architecture, and is powered by range of updated but familiar and essentially off-the-shelf VW Group engines.
At 4421mm in length, this latest version of A3 soft-top is slightly longer (by 183mm) than the model it replaces, as well as being 28mm wider (at 1793mm). However, with a 15mm reduction in overall height, from 1424mm to 1409mm, the new A3 cabriolet is more squat and purposeful-looking than before, and has what Audi describes as a 'coupé-like stance'.
Despite the increases in length and width, the A3 cabriolet is actually lighter than before, thanks in part to the new MQB architecture and aluminium-hybrid body construction (which includes an aluminium bonnet), and also to revisions to the range of engines. The body-in-white weighs 30kg less than before, and the entry-level model has a kerb weight of just 1440kg. The third gen A3 received a mid-life facelift in 2016, focusing directly on improved interiors, more standard equipment and minor work to the lights and bumpers, which was also replicated across the second generation cabriolet so the whole A3 range has the same shelf life.
The engine range, same as the rest of the A3 range, consists of three petrol and three diesel options. The entry-level petrol is the 1.4 TFSI cylinder on demand (CoD) unit, which produces 148bhp and 184lb ft and promises a 0-62mph time of 8.9sec. It's an exceptionally refined powerplant which is incredibly quiet at idle and around town, and therefore ideally suited to drop-top use.
Its fuel-saving cylinder cut-off technology also means it's impressively frugal, offering 54.3mpg combined and emitting 119g/km of CO2 on 19in alloy wheels. Its relatively small capacity means it lacks outright top-end go, but it's a pleasant and rewarding engine to use.
The second petrol option is the 2.0-litre TFSI, which produces 188bhp and 236lb ft. While its gutsier delivery and claimed 0-62mph time of 7.3sec (6.9sec if you opt for the quattro version) is perhaps better suited to the idyllic sporting ethos of top-down motoring, it's not expected to be a big seller in the UK. The same 2.0-litre unit has been given a working over by Audi Sport who has managed to eek out 305bhp for the S3 version which tops the range.
The diesel options consists of a 108bhp 1.6-litre unit, which heavily focuses on economy and low emissions making it perfect for the hatch and the saloon but less so for a top-down cruiser. The rest of the range consists of a 2.0-litre oilburner in two variants - 148bhp and 181bhp - both of which are available with Audi's quattro four-wheel drive system.
On the road, the A3 cabriolet is a competent if not exactly engaging steer. The inevitable compromises of the cabriolet's roof removal are dealt with in reasonable fashion, although there's no hiding the fact that some rigidity and ride refinement have been sacrificed.
Scuttle shake is kept to a well concealed minimum but there's detectable movement through the body when dealing with larger intrusions and over more challenging road surfaces. It's never terrible, but there's no getting away from the fact that you're dealing with an essentially compromised chassis. If the option of lowering the roof is an acceptable trade-off, however, you should have no cause for serious complaint.
That roof, incidentally, which opens and closes in 18 seconds at speeds of up to 31mph, comes in two versions. Entry-level SE models get a standard hard-wearing fabric roof, but a more sound-absorbent 'acoustic' soft-top is available as an option, or as standard on higher spec models.
So the A3 cabriolet drives acceptably well, it's slightly bigger (but also slightly lower) and slightly lighter than before, and comes with the appealing option of a clever, cleaner version of petrol engine. It also gets a slightly bigger boot - 320 litres with the roof closed compared with 260 litres in the old A3 cabriolet - and, according to Audi, 'generous space' for four passengers.
That we'd take some issue with. While the front cabin is spacious enough (although the driver's elbow can fight for space with the passenger's arm during manual gearchanges), the two rear seats really aren't the most accommodating. Anything bigger than a medium to large-sized child will want for shoulder and legroom on anything but short journeys, even with the distraction of a top-down, wind-in-their-hair experience.
There are four trims to choose from - SE, Sport, S-line and S3. Entry-level models get a wealth of standard equipment, with 16in alloys, xenon headlights, heated wing mirrors, cruise control and rear parking sensors all included on the outside, while inside there is air conditioning and Audi's MMI infotainment system complete with a 7.0in retractable screen, DAB radio, Bluetooth and USB connectivity.
Upgrade to Sport and you'll find larger alloys, dual-zone climate control, sat nav and numerous aluminium interior detailings added to the package, while topping the standard A3 Cabriolet range S-line models gain a lower, tauter suspension, a sporty bodykit, LED head and interior lights, and additional storage space and conveniences.
Those pining for a fast cab can choose the 305bhp S3, which gets its own trim which incorporates the S-line model's specification and adds 19in alloy wheels, adaptive dampers, an Audi Sport breathed on suspension, heated front seats, a Nappa leather upholstery and an aggressive body kit.
Overall, the A3 cabriolet fills its brief pretty well. It's a stylish product which is exceptionally well executed both inside and out. The inevitable dynamic compromises made in the name of roofless motoring, allied to artificial steering free of much in the way of meaningful feedback, blunt the model's appeal to the enthusiast driver, but otherwise this compact convertible is a measured success.
If you aspire to a premium open-top driving experience, then Audi's latest drop-top should be on your shortlist, alongside the equally beguiling BMW 2 Series and 4 Series Convertibles and the Mercedes-Benz C-Class Cabriolet.