Best "pseudo" multi channel from 2 ch sources

The only one I like is Trifield on the Meridian processors.

Meiwan wrote: If you are playing redbook cds mainly, the centre/rear channels will just be duplicates of the 2 main channels.

Not so. There are many systems that will extract ambiance information for surround and interpolate a center and these include the ubiquitous Dolby and dts processes. However, the OP is advised to try them before buying since they vary considerably in their capabilities and configurabilities.

Kal

IMO I have found no processor that surpasses the Angstrom 200.
I have the Anthem d2v processor, but for 2 channel sources I still use my Angstrom. It provides a fuller sound stage than just 2 channel alone. It also produces great 2 channel as well. There was one listed on AGON a day or so ago. PS, I have a $2000 DAC that does not out perform the Angstrom!! However, this unit a ten years old does not have the latest bells and whistles, but for DTS and 2 channel surround, it excels.

Either the Spread Spectrum Technologies Trinaural processor or the Miles Tech M86 (5 channel) or the M44 (3 channel) processor will do what you want using a 2-channel source. Both of these are analog domain processors; no need to go digital if you don't wan't to.

Full disclosure: I'm selling a Miles Tech here.

In HT, the center does more work than any other channel. The rears do the least. You can get away without a sub if your mains can handle the work.