Originally Posted by johnty
The Denver area finally got its first Dolby Atmos installation in an AMC theater with an ETX screen.
The most obvious changes in the auditorium were two rows of five speakers on the ceiling and six(!) large subwoofers hung from the ceiling in the back of the theater. The movie was G.I. Joe in RealD XL 3D.
I sat in the middle/middle of a virtually empty theater to critically listen to the new sound system. The “Leaf” logo had a nice dimensionality but lacked the ethereal any-point-in-the-room quality I was expecting. The movie made constant use of the (very hot) surround channels. I didn’t exactly have to strain to hear the screen speakers but I’ve never heard surrounds turned up to such a high level. I chalk it up to “new toy” syndrome where AMC wanted to make sure their upgrade was noticed. The bass was exemplary with the rear subs quite obvious at times.
I was surprised that I only heard the side surrounds from speakers directly to the left and right of me. I didn’t hear sound move along the wall as things panned front to back or vice versa.
From the White Paper link in the first post of this thread, it appears that any speaker/channel/amp configuration is okay in an Atmos installation:
“In contrast to using all 64 output channels available, the Dolby Atmos format can
be accurately rendered in the cinema to other speaker configurations such as 7.1,
allowing the format (and associated benefits) to be used in existing theatres with no
change to amplifiers or speakers.”
The question is, did AMC reconfigure it’s surrounds to “one speaker-one amp” or did they just add the ceiling and subs and call it day? How can a person know if they’re going to a full-blown Atmos theater or one I would call Atmos-Lite? Anything in Dolby licensing that requires one surround speaker per channel before an auditorium can display the Atmos logo?
Unrelated question: How are most surround speakers wired to one physical 5.1 or 7.1 channel? If I’ve got nine right surrounds on one wall, wiring them in parallel would drop the impedance too low for the amp. If they’re in series it’s too inefficient. Do most theaters already use more than one amp for a set a surrounds?