As longstanding audio solutions provider to the Canadian Government, GerrAudio and Engineering Harmonics recently created a custom podium microphone for the interim House of Commons – their solution was to adapt DPA’s 4081 mics and DPA TSM 4001 shockmount to the cut-outs of the Parliament’s existing podium units.

‘When you’re working with such a high-level client, there are no compromises,’ says Engineering Harmonics Senior Consultant/Partner, Martin Van Dijk. ‘There were really specific requirements for how the microphones worked, how they picked up the sources and, obviously, for their sound quality. Given the need for a clean aesthetic and simple solution, body-worn and standard gooseneck podium microphones were both out of the question.’

Additional challenges were presented by the space itself – a glass-roofed structure built inside a courtyard in the Parliament’s West Block. Also, the mics were to be used not only so the members of Parliament (MP) could hear each other, but also to capture proceedings for interpretation, broadcast and archival purposes.

Prototype DPA mic for Canadian Government‘There couldn’t be anything sticking up from the podiums and MPs don’t – and won’t – wear lavalier mics,’ says GerrAudio Technical Sales Manager, Geoff Maurice. ‘Given the need for clarity and intelligibility, and for a product invisible to cameras in the House, Martin was searching for a very specific type of microphone in a form factor that wasn’t publicly available. And he wanted it to be DPA.’

Van Dijk knew his specific needs required a high degree of cooperation from the microphones’ manufacturer if he was to create a truly custom solution that met the performance requirements. ‘That prompted me go to a brand with a proven ability to build something that provided studio-grade performance in terms of noise floor,’ he says. ‘I knew DPA also wouldn’t just put one of its existing products in a different housing. The company really put effort into engineering this microphone, and GerrAudio helped facilitate that.’

The initial stages of the custom mic began with Maurice creating a prototype. ‘We started with a DPA TSM 4001 shock mount, which fits the existing cut-outs in the millwork,’ he explains. ‘I took one apart, cut some bits and pieces out of it, hot glued an existing DPA 4081 microphone inside of it, and added foam for damping. The 4081 reduces the noise floor and increases rejection, which helped get the pattern we were looking for. Initially, I was concerned about changing the cardioid pattern by placing that element against a boundary element. But, after testing, we discovered that, rather than break apart, the pattern shifted upward off the surface, which worked to our advantage.’

To ensure all the Commons’ requirements were met, GerrAudio built a mock-up of the podium to test the prototypes. ‘MPs typically speak from between the podiums, not from directly behind their own,’ continues Maurice. ‘For redundancy, we mounted two microphones at the outer corners of each podium and turned them towards the outside of the podium to catch the speaker in the middle. After mounting the prototypes in the appropriate configuration, we ran the signal to a mixing console and recorded speech from different angles and heights before sending the recordings to Engineering Harmonics for further review.’

Once Maurice and Van Dijk were satisfied with the prototype, they approached DPA directly to work with the brand’s product development team. Van Dijk ‘had confidence that we’d end up with a solution that met all of the requirements; and that’s what happened. Once they developed the solution, they sent technical details and recordings for us to review, until they refined it to a perfect prototype’.

The pair then flew to DPA’s headquarters in Denmark to establish final proof-of-concept. Manager René Mørch and his team continued testing in the company’s studio and other internal test areas. ‘The team built a mock-up of the podiums and had some competitors’ microphones there so we could do some comparisons in situ and really listen critically to the results,’ Van Dijk says.

DPA delivered more than 400 custom elements for installation in the Commons where the installation was handled by Ottawa-based engineering firm, Applied Electronics. ‘They used a standard DPA capsule, integrated it with a better acoustic guide, and made a beautiful new model of microphone for the House of Commons,’ Maurice says. ‘Inevitably, they made it more robust, controlled, quiet, and much sleeker looking, too. We’re extremely happy with the result. The government has been using the system for months now and, even though the interim space is acoustically challenging, they have a high-quality microphone with great speech pickup.’

‘The broadcast team on The Hill are also very happy with the consistency and quality,’ Van Dijk adds, ‘but the best compliment I received was from one of our American counterparts working on the project – someone who’s also worked for the US Government. He emailed me to ask how we got such pristine sound and was flabbergasted to find out we used a mic in the podium, rather than a lavalier.’

‘It’s great to see that companies are willing to go that extra mile, but also that they understand what it means to do that. ‘I’ve had dialogues with technicians working for different governments around the world, and they regard Canada’s Parliament as a benchmark. We had to get it right, and DPA and GerrAudio helped us do that.’

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