Dennis Burger: At the end of our previous post in this series, I teased the fact that one pair of speakers at the back of the room ended up driving the decision-making process for the entire Atmos surround sound speaker system. It’s worth digging a little more deeply into exactly why that’s the case.
Just to remind you what the geometry of our demo space looked like, here’s an overhead view of the back of the room. The rear wall is at the top. You can see a rough approximation of what we thought our seating may look like, as well as the canted walls that made the outside of the booth look so great, but crunched us a bit in the demo space.
If we had gone with seven ear-level speakers, that would have meant four speakers in the back of the room, at positions marked A and B. But this would have caused problems for anyone sitting in the back row. Someone sitting next to speaker A on one side of the room wouldn’t have really been able to hear speakers A and B on the other side, and the speakers at the front of the room—for dialogue and screen sound effects—would have been drowned out. Sometimes more isn’t necessarily better.
What I really needed was a speaker I could position somewhat closer to the points marked C, but a little higher on the wall so as not to overwhelm any one seat in the back row. The extra height was also added to accommodate anyone standing in the back of the room, so they wouldn’t block the surround sound effects for anyone sitting in front.
I desperately needed a speaker that would project its sound out into the room authoritatively, while also spreading its sound out less like a spotlight and more like a floodlight.
I also needed an in-wall solution, for reasons discussed in our previous post. One speaker came immediately to mind: GoldenEar Technology’s Invisa MPX MultiPolar in-Wall speaker. The MPX’s bass/midrange drivers don’t point straight out into the room, as do those of most speakers. One of the drivers is rotated a bit to the right, the other a bit to the left. Combine that with the company’s High-Velocity Folded Ribbon tweeter (which squeezes air sort of like an accordion to create low-distortion, room-penetrating high-frequency sounds, rather than pushing air like a normal dome tweeter), and you have the makings of everything I needed here—wide, deep, enveloping sound that wasn’t diffuse.
And with that piece of the puzzle solved, the rest of the speaker system started to fall into place. To match the sound of the MPX, I specified three of GoldenEar’s Signature Point Source (SPS) in-walls for the front left, right, and center speakers, and four of the company’s Invisa 650 in-ceilings for the overhead channels.
We also had just enough space at the front of the room for subwoofers, so I opted for a pair of SuperSub X subs. Why two subs for such a small space? It wasn’t so much about producing enough volume as it was about delivering rich, even bass in such a weird acoustical environment and making sure every seat in the room experienced the same level of bass.
With those decisions made, I called GoldenEar’s Vice President of Marketing and Sales, Jack Shafton, and asked him if I could take him on a virtual tour of our most current 3D design for the booth. I wanted a second opinion from an industry expert, just to make sure I had made the right choices given such compromises. I also wanted his advice on exact speaker placement.
Here’s Jack with his reactions to seeing the 3D renderings for the first time, along with some thoughts on what makes GoldenEar’s architectural speakers unique:
Jack Shafton: When Dennis shared his plan for this booth at CEDIA, my first reaction was, “YIKES!” GoldenEar always uses a fully enclosed sound room for our own trade-show demos, so this was certainly a new challenge. We agreed that this room would never be ideal, but could certainly be done effectively using the Invisa speakers and SuperSubs. Dennis hit on one of the reasons the Invisa MPX was such a good choice: It’s a direct radiator (important for today’s surround formats) with very wide dispersion. But I would also mention that the power handling and efficiency of the speaker are of great importance given the semi-open nature of this sound room.
That’s just one speaker, though (well, two in the case of this room). As for why GoldenEar’s Invisa speakers were the right choice overall, remember that this system needed to impress consumer electronics industry members, not the average consumer who has never heard a great-sounding home theater. One thing that I think sets our in-wall and in-ceiling speakers apart is that we design them using the same drivers and technology employed in our award-winning Triton tower speakers. There is no good/better/best stratification in the GoldenEar architectural speaker lineup; just the best of everything we do. The folded-ribbon tweeter offers exceptional dispersion, amazing fidelity, and great power handling, and it is found in every Invisa speaker. Combine that with our mid/bass driver
GoldenEar Invisa MPX
technology, crossover design, and GoldenEar speaker voicing, and the result is exactly what Dennis needed to blow people away in a space that had no business sounding as good as it did. Of course, the two SuperSubs helped a lot, as they provide big sub performance in a tiny, vibration-cancelling design.
DB again: In addition to confirming my speaker choices, Jack gave me some helpful advice in terms of placement, especially of the front speakers and overhead channels. That guidance was invaluable given the weird geometry of the room. Mind you, the odds you’ll be installing a cinema sound system in a room as compromised as ours are slim. The lesson to be learned here is that when taming a problematic home cinema space, you’ll sometimes find that solving your most daunting problems first makes all of the other pieces fall into place.
Still, as amazing as GoldenEar’s speakers are, if we had merely slapped them in the walls and ceilings and provided them with power, they wouldn’t have sounded their best. In our next post, I’ll be discussing how Trinnov’s Altitude 16 home theater preamp/optimizer helped us tame some of the room’s worst acoustical problems and give the GoldenEar speakers room to shine.
Jack Shafton is a 40-year veteran of the consumer electronics industry who has been
involved in the design, manufacture, and marketing of some very successful specialty
audio products, including two highlighted in Stereophile’s “100 Most Important Audio
Products in the Last 40 Years.” Jack’s love of music and movies, combined with a
passion to bring better sound into everyone’s home, has been the driving force in his
commitment to help the industry grow. He also loves fast cars and
cats. (Sorry, dog lovers.)
Dennis Burger is an avid Star Wars scholar, Tolkien fanatic, and Corvette enthusiast
who somehow also manages to find time for technological passions including high-
end audio, home automation, and video gaming. He lives in the armpit of Alabama with
his wife Bethany and their four-legged child Bruno, a 75-pound American Staffordshire
Terrier who thinks he’s a Pomeranian.