Wadia’s 861, and latterly the 861se, CD player has been pretty much a permanent feature around these parts, not least because the only player I’ve heard that seriously surpassed its performance cost five times as much, while few others even got close. Until recently, that is. The arrival of the Audio Research CD7 marked the first machine to equal both the price and musical merits of the Wadia, whilst the arrival of SACD, and more recently the D3 versions of the Esoteric machines to play them on, has offered up another challenge.
With that in mind, and somewhat frustrated by the lack of developments from the parent company, our 861se made a long (and extremely fruitful) trip to the Great Northern Sound Co, for their seriously extensive modification programme. Ex-Wadia engineers, they do a fantastic job that I’ll be reporting on in Issue 62, but in the meantime, what should happen along but the latest offering from Wadia themselves.
Dubbed somewhat archly the 581se, the new machine is visually almost identical to the old, further adding to the confusion. It uses the same monolithic construction, digital volume control and offers the same digital input and switching options*, indicated by an i suffix and £500 premium over the £9950 cost of the standard version. But look a little closer and you’ll see differences that whilst subtle, hint at important changes. Not least are the slots cut in the side and bottom panels, to improve cooling. Then there’s the fact that the display actually sits in the middle of its window, while the remote is half the size and ten times as useful (bear in mind that the original was the biggest and most useless remote ever, requiring you to stand right in front of the machine to get it to respond, and having so many identical buttons that spotlighting was a prerequisite for operation).
But these changes are much more than skin deep, internally embracing four key areas of system performance.
*These are even more relevant today, especially given Wadia’s outreach strategy based on the 170 iTransport, a neat little dock that extracts a digital signal from your iPod.
I’ll sketch over these fairly quickly, due to the limitations of space, but it will give you some idea:
1. The power supply section has been totally revised, now featuring six separate and independent supplies for different sections of the circuitry, and upwards of 30 local regulation stages. These include a sophisticated new switch-mode architecture developed to provide individual supplies for the transport, display and digital sections. As before, there is also extensive internal mechanical isolation, while extensive inductive filtering on the charging caps, as well as careful shielding and positioning ensure that the switching supply has no deleterious effects, either internally or externally. The complete power supply arrangement delivers a noticeably cleaner ground plane.
2. A new, patent pending clock circuit has been implemented, that includes its own voltage regulation built right beside it on the board. Wadia’s research showed that jitter performance was significantly influenced by fluctuations in oscillator temperature and voltage. By attacking both variables with heavy regulation and thermal compensation, accuracy has been improved to the point where it is measured in single parts per million.
3. Not content with simply including DSD decoding, Wadia further developed the format, creating a parallel processing algorithm operating at 64bits and 2.8 MHz, that corrects deficiencies in the rise time of the original encoding, delivering improvements in phase accuracy and a 124dB S/N ratio.
4. The new SwiftCurrent 3 output topology moves from an i/c based implementation in the 861, to a discrete Class A circuit in the 581se. That’s why it needs all those slots! In order to avoid loading the DAC’s output, resulting in non-linearities, the circuit itself is a decoupled current mirror design. The new layout also provides three separate paths per channel, meaning that the positive and negative legs required for the balanced outputs are distinct from the single-ended path, allowing Wadia to ensure that both balanced and singleended outputs deliver identical levels without resorting to an extra gain stage before the RCA sockets.
Okay, so it reads like a wishlist of audio upgrades to the existing circuit, but that’s exactly what it is, helping to explain why it took so long to arrive. The end results are both sonically and operationally impressive. In use, the 581se certainly runs noticeably hotter than its predecessor, while it also seems more sensitive to support, the Stillpoints component stand delivering an even greater benefit than it did with the 861; that discrete output stage perhaps? I’ll mention again the remote control, which is now sensibly sized, nicely laid out and operates flawlessly from distance. In fact, the only (unavoidable) step backwards is the sluggish disc handling imposed by the inclusion of SACD. The transport and optics are derived from a Sanyo model with extensive modifications, whilst decoding is carried out by a monolithic Sony chip, in combination with Wadia’s proprietary Digimaster 2.5 algorithm. As well as the digital volume control, you also get balance and a choice of three decoding profiles, each offering subtly different levels of extension and focus. I generally preferred the meat, substance and sense of flow that came with Algorithm A, but it’s worth following Wadia’s clear instructions as regards comparing the three, as you will have your own preference and there are also instances in which an alternative setting offers better results. In addition, it’s worth noting that (as with the 861) you can adjust the 581’s maximum output level to match the overall gain of your system. This is important in any situation, but especially so if you are using the player as a digital pre-amp, ensuring that you run the volume control near the top of its range and don’t risk losing resolution. Finally, and in its own way most welcome of all, the 581 doesn’t suffer the protracted warm-up of its predecessor, sounding far less leaden from switch-on and achieving near full performance overnight; a blessing for reviewers and the eco-sensitive alike.