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It is the same reason, to use EBA ALL the speakers used by that preset must support EBA, so in this case it is your rear DSP5500's that veto EBA.
Carl,

Thanks, was forgetting that Trifield mixes to the rears, looking at the Trifield preset there is no option to switch off the rears and run Trifield across the front 3 only.

Tried taking the 5500's out of the Mconfig file and as you say EBA suddenly appears in Trifield.

Also note that in the tooltip in Mconfig, EBA stands for Enhanced Boundary Alignment and not Enhanced Bass Alignment.

Regards

David

861v6 ID41, HD621, G98, MC200, DSP7200, DSP7200HC, DSP5500 (rears), D2500; Oppo BDP83, PS3,
- Other rooms 3100, F80