USA - Originally established over 200 years ago in Raleigh, North Carolina, Edenton Street United Methodist Church (ESUMC) is reputed for its for its famous pipe organ, its alluring chandelier and its majestic stained-glass windows that dominate the sanctuary. To that, can now be added Martin Audio’s O-Line optimised micro line array, which blends discreetly into the 27” thick sandstone walls. This aesthetic, slimline, columnar solution was recommended and installed by local production house, RMB Audio.
The installation team were as fastidious in removing the old public address system, which had served the church so dutifully over an astonishing seven decades, as they were in installing the new rig, comprising two hangs of 16 O-Line modules.
The former system had originally been integrated within the chandelier during a rebuild of the church following a fire, back in 1957. But according to RMB founder, Cooper Cannady, there was now clearly a need for higher SPL and a significant upgrade in speech articulation. Although Martin Audio’s dedicated DISPLAY prediction software indicated a 12-box solution, Cannady recognised that by increasing this to 16 cabinets - driven in in two-box resolution from a pair of Martin Audio iKON iK81 multichannel amplifiers - he would not only gain both floor and balcony coverage, but be able to avoid reflections back from the balcony fascia.
“The frequency response of O-Line [85Hz-18KHz] in a large voluminous space such as this better reduced LF resonance,” he notes. “At the same time, the sidelobe-free close spacing of five 21mm HF drivers ensured uninterrupted audio at the adjacent left and right pulpits, even though they are positioned slightly in front of the upstage O-Line hangs. This is what often creates the problem with other systems, where you can’t have the speech articulation you want because of the proximity of the mics.”
Explaining this further, he says: “Within 12-15ft of the arrays is a lectern and with celebrants on Lavaliers or head mics and they are able to walk in front of the O-Line without any problems with feedback whatsoever. For human articulation, O-Line is always the ‘go to’ solution.”
The challenges extended well beyond the thickness of the walls themselves. Installation of the O-Line wall bracket had required stonemasons with knowledge to confidently drill into the walls for threaded rod fitting.
As for the cabling, several 500ft reels were required to accommodate viable flow paths for the difficult runs behind the scenes, particularly around the pipe organ. Dave Clemmer, ESUMC Audio Steward (and long-time collaborator with RMB Audio), emphasised the task of “crawling around pipe organ lofts with hundreds of feet of signal cable runs—through 27” thick walls, concrete and existing empty conduit.”
As such, he says, a new rule of thumb was established on this project: “Measure four times, drill once”. However, the RMB Audio tech team were already entirely familiar with the facility prior to installation, having frequently augmented the Church’s productions by bringing in Martin Audio CDD12 or CDD15 for the more progressive worship services, featuring a full band. “Now with O-Line they can replicate what we were doing for them earlier,” explains Cannady.
Reflecting on an installation which respects the heritage of the building, Cooper Cannady says that due to the forgiving nature of O-Line virtually no tuning was needed, despite sound swirling round a high elevation ceiling. “The room is very settled because with so much stained glass, the ceiling vault starts so high up the wall. We were fortunate in that respect, as were that not the case, it could easily have introduced reflections elsewhere.”
