DiGiCo Is Keen To Stay True To Its Manufacturing Roots
The audio industry recognizes that if digital processing technology is to become the standard for the mixing of live sound, the consoles are going to have to get smaller, cheaper, easier to build, and easier to run. Suddenly, small is beautiful.
It’s against this backdrop that DiGiCo launched its SD8 a couple of months back. Since the official unveiling in September, the board has been named Best Sound Product Of The Year at LDI and Most Innovative Product In The Live Industry at the SIEL tradeshow in Paris. The company shipped 75 consoles in October alone, barely two months after completing its initial, pre-production run.
Other console manufacturers have found—to their cost—that while it may make sense on paper to outsource the production of smaller, cheaper desks to China, such a move carries with it the risk that the fruits of your R&D labor will be meticulously reverse-engineered and illegally copied. That’s one reason why DiGi-Co is building the SD8 on a dedicated production line at its plant in Glenrothes, Scotland.
The area is better known for golf and malt whisky and seems, on the face of it, an unlikely place to be building state-of-the-art audio hardware. Yet over the past two decades, the region has become something of a center for hi-tech innovation, earning itself the nickname ‘Silicon Glen’. Companies such as DiGiCo are spoiled for choice when it comes to sourcing specialist services such as high-density PCB assembly from third-party manufacturers located nearby.
This is important because, as DiGiCo rightly boasts, its SD series of consoles is the first to use Super FPGA (Floating Point) technology for the audio signal path. “The biggest processing density required of a digital console is the matrix—inputs, outputs, signal path, and so on—not the effects,” pointed out Dave Webster, DiGiCo’s marketing director. “Other companies might be
United they stand (from left): Dave Webster, marketing director; John Stadius, technical director; Moira Kinloch, operations manager; and Colin Munro, production manager. using [Analog Devices] SHARC FPGA technology for their effects, but we’re using TigerSHARCs, which are much more powerful, for the really demanding tasks.”
Webster added that the company’s D5 live mixing console, still a favorite among sound engineers the world over, uses 39 SHARC processors, while the SD8 requires only a single TigerSHARC for what amounts to about 90 percent of the power. He reveals that DiGiCo’s technical director, John Stadius, began working on the technology behind the SD series six years ago and that, although the first console in the line—the SD7—only saw the light of day in 2007, the nature of FPGA makes future product development more straightforward.
“It’s incredibly easy to scale up and scale down with FPGA, far more so than with DSP,” Webster said. “Essentially you use the same code—it’s just a question of scale. You’re always writing to one chip, rather than multiples of the same chip as you do with DSP. That’s one reason we were able to come up with the SD8 so quickly after the SD7.”
As well as enabling greater processing power, DiGiCo’s use of Tiger-SHARC processors also puts that power on a smaller footprint—a vital issue for concert venues wanting to maximize revenue by installing extra seats, for example. The company’s PCB designs use three different kinds of component packaging: traditional through-hole soldering, surfacemounting, and ball-grid arraying for the Tiger SHARCs.
Webster said, “With a Tiger-SHARC you’ve got more than 1,500 connections—the equivalent of pins—sitting in a space that is just 40mm square. So the space-saving that the ball-grid array gives you is enormous.”
LOOK AND FEEL
All this clever engineering under the hood would be meaningless, of course, if the face the SD8 presents to the outside world were not suited to its role in life. The console may offer up to 60 mono or stereo channels—the equivalent of 120 channels on a DSP-based device—in an appealingly compact package, but that package still needs to be affordable and usable.
One reason the SD8 is so affordable is that it is cheaper to make than its bigger stablemates. “Whereas our larger consoles like the SD7 have a modular construction, the SD8 uses a one-piece housing which is more costeffective to manufacture,” explained Colin Munro, production manager at Glenrothes. “The new desk also has some onboard I/O, which means it takes less time to test—typically 24 hours compared with three days for one of the bigger units.”
Once assembled and tested, the SD8 is also an aesthetic departure from previous DiGiCo designs in a number of ways. “There is only one central touchscreen, which obviously represents a cost saving,” Webster said. “But it’s important to remember that this console will generally be driven by a single operator. And if you want to add a second screen, there’s space to the left of the screen for you to place a laptop, on which the key parameters can be duplicated in real time.”
To the right of the screen, meanwhile, is a further space that is the result of DiGiCo listening to the comments of end users in smaller venues such as multi-use theaters, colleges and places of worship. “That space is for an external control device,” Webster explained. “Engineers in smaller venues often like to have simple, central control over things like house lighting. They don’t have a separate person to do that, so they need control on the console. This allows them to design their own controller and place it where it can be accessed easily.”