What material are you listening to when you note the lack of LFE? Unless it is a Dolby Digital 5.1 or DTS track (with a dedicated LFE track going to the sub), there won't be any information going to the sub in a system with the speakers all set to large - stereo (analog or PCM digital) and Dolby 2.0 material will only have a signal going to the sub if the speakers are set to small so that some crossed over material is fed from them to the sub.

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