PERFORMANCE COMPARISON TABLE
|Cabinet||Driver||Extension (Hz)||Low Bass Output (dB)||Mid-Bass Output (dB)||Bass Quality||Mid-bass Rating|
Reference Level movie output is approximately 125dB at 31.5Hz according to Dolby Atmos specifications.
GSG recommended Reference Level movie output is 125dB at 18Hz (after room gain is included).
Overbuilding a system by approximately 6dB will make it sound stronger and cleaner.
Any system that achieves reference level for movies will be sufficient for video games.
"Highly Compressed Pop Music" has peaks of approximately 110dB SPL even at a Very High Level.
"Orchestral Music Concert" has peaks of approximately 116dB SPL.
"Very Loud Music" has peaks of approximately 120dB SPL.
"Extremely Loud Music" has peaks of approximately 126dB SPL.
"Rock Concerts" have peaks of approximately 130dB SPL (front row Metallica show for example).
In room, subwoofers will provide a couple of Hz extension below the tuning frequency of the cabinet.
Examples of required extension:
- 32-foot pipe organ (16Hz)
- Some digital effects in synthetic bass tracks (16Hz)
- Lower limit for just about all Dubstep, EDM, Trance (20Hz); very little content from 20-27Hz
- Lower limit for just about all music as well as the lowest note on an 88 key piano (27Hz)
- Lower limit on a 5 string bass guitar (30Hz)
- Lower limit for most other music (38Hz)
Reading the Table and Room Gain
Output levels in the table above are "2pi space", which is roughly the output that they will provide outdoors.
In room, SPL will be higher depending on room size.
Differences of 1-2dB are not significant.
Output will vary based on room. Some rooms have a lot of room gain, others do not.
For a small room, room gain is typically around +3-5 dB at 30HZ, and +6-8dB at 20Hz.
For a medium size room, room gain is typically around +2-3 dB at 30HZ, and +5-6dB at 20Hz.
For a large size room, room gain is typically around +1-2 dB at 30HZ, and +2-3dB at 20Hz.
Two co-located subwoofers provide roughly +6dB, two non-co-located subwoofers provide roughly +3dB.
Four co-located subwoofers provide roughly +12dB, four non-co-located subwoofers provide roughly +6dB.
Eight co-located subwoofers provide roughly +18dB, eight non-co-located subwoofers provide roughly +9dB.
Multiple subwoofers have the added advantage of smoothing out peak and dips in the frequency response caused by room modes.
It is almost always better to use two medium subs vs. one mega-sub if space and placement allows.
Low Bass Output and Mid-Bass Out
These are rough limits based on usable driver excursion and/or amplifier voltage limits of the Behringer NX lineup.
With higher voltage amplifiers, greater output may be possible in some cases (this is particularly true for the LaVoce drivers which are only available in 8 Ohm).
Bass Quality and Mid-bass Rating
These are subjective ratings independent of the output level.