When listening to undecoded 2-channel UHJ material, the rear information is folded down over the front stage at 3dB down, so that the soundstage retains some degree of 'distance' between front and rear. For example, a sound panned around the listener in surround will, when auditioned undecoded, appear more distant as it passes across the 'rear'; in addition, the interchannel phase relationships associated with rear localisation make the sound attempt to appear behind the listener as a result of a form of 'aural decoding'. However, while this is generally effective in the case of Ambisonically-mixed content, in the case of material recorded with a soundfield microphone (SFM) system the ambience, for example in a concert-hall, may be sufficiently high in level when undecoded to make the recording appear over-reverberant, where this is not the case when the UHJ is decoded into surround. This has been cited in the past as a criticism of some SFM recordings by some record reviewers: the problem can be ameliorated by careful mic array positioning (e.g. a position closer to the musicians).