Cabinet Driver Extension (Hz) Low Bass Output (dB) Mid-Bass Output (dB) Bass Quality Mid-bass Rating
MartyCube 460HO 18 117 120 Good Average
MartyCube UM18 18 118 119 Good Average
MartyCube PA460 18 109 122 Excellent Excellent
MartyCube TBW100 18 116 126 Excellent Excellent
MartyCube SAF184.03 18 117 125 Excellent Excellent
Mini-Marty 460HO 16 118 120 Good Average
Mini-Marty UM18 16 120 119 Good Average
Mini-Marty PA460 16 112 120 Excellent Excellent
Mini-Marty TBW100 16 115 126 Excellent Excellent
Mini-Marty SAF184.03 16 116 125 Excellent Excellent
Full Marty 460HO 14 116 120 Good Average
Full Marty UM18 14 119 119 Good Average
Full Marty PA460 14 110 118 Excellent Excellent
Full Marty TBW100 14 114 126 Excellent Excellent
Full Marty SAF184.03 14 115 125 Excellent Excellent
21-Cube 21DS115 17 120 129 Excellent Excellent
21-Cube 21SW152 17 120 128 Excellent Excellent
21-Cube SAN214.50 17 120 126 Excellent Excellent
MBM-18 PA460 25 114 122 Excellent Excellent
MBM-18 TBW100 25 123 127 Excellent Excellent
MBM-18 SAF184.03 25 123 126 Excellent Excellent
21-MBM 21DS115 26 127 129 Excellent Excellent
21-MBM 21SW152 26 126 128 Excellent Excellent
21-MBM SAN214.50 26 124 126 Excellent Excellent



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.

Music Levels

"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).

Music Extension

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.

Multiple Subwoofers

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.