Arnold Krille <arnold(a)arnoldarts.de> ... This is complicated. The various options are discussed at: http://www.ambisonia.com/wiki/index.php/Bass_management#What_to_do_with_one… and: http://www.ambisonia.com/wiki/index.php/Bass_management#What_to_do_with_the… Ignoring the LFE-channel is not recommended as it may contain stuff not present elsewhere. Adding it to W is good, but it will then end up in the main speakers and these may explode. (The solution to this is to incorporate a limiter.) You could also carry it forward as a separate channel and feed it only to the subwoofer at the end. Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/