DTS ES
DTS ES is an extended digital surround format intended to compete with Dolby Digital (THX) EX. DTS ES adds an extra matrix-encoded surround back channel that can be played through one or two speakers from behind the audience.

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- DTS ES 6.1 Discreet is the only true 6.1 surround format available.
- Requires 6 or 7 speakers and a subwoofer and a compatible receiver or preamp.
- Encoded material is backward compatible to DTS.
- Decoder hardware for DTS ES is very expensive.
- Extra speakers might be difficult to place in most living rooms.
To decode DTS ES you will need a DVD encoded in the format and a DTS ES-capable decoder (receiver or pre-amp/processor). There are few receivers or pre-amps capable of decoding this format today and the ones that exist are expensive.
A probable downside for the extended surround formats is the extra speaker requirement and the space they might take, especially when seating might be back up against the wall.
