Attenuating out of band energy emitted from seismic sources

A seismic source for marine seismic acquisition, comprising: a barrel; an igniter coupled to a base of the barrel; a mixture supply coupled to the base of the barrel, wherein the mixture supply provides a combustible mixture to the base of the barrel; and an actuator coupled to the igniter, wherein the actuator controls an ignition of the igniter, and wherein the ignition is configured to combust the combustible mixture such that the combusted combustible mixture displaces a volume of water surrounding the barrel at a rate less than 2.9 x 106 m3/s3. 8309973_1 (GHMatters) P88384.AU.2 27/10/2016 DISPOSE SEISMIC SOURCE IN BODY OF WATER SEND A COMMAND TO THE SEISMIC SOURCE TO RELEASE A GAS TO DISPLACE A VOLUME OF WATER AT A RATE THAT IS LESS THAN 2.9 X 106 m3/s3