It's an old stereo version of the 1176 plain and simple.

I don't want to sound like a shill for UA, but if you are seriously interested in a two channel or stereo 1176, check out their new 2-1176. Its a lot cheaper than two 1176 units and it seems like it might be a bit nicer than the old 1178

Thanks man for your info. I would like to dig a little deeper info this unit Coz' I can buy it around $1,000 . If you have any link that point to the detail info please let me know.

An 1178 is a mono or stereo [but probably best not used dual mono because like the RNC it has only one set of attack and release controls] compressor/limiter.

It, like most of the "silver faced" UREI products of that time has a transformerless input which is great for cutting costs on manufacturing, but not so great for getting that "1176" sound we've grown to know and love.

They still have their uses... I quite like them for compressing the snot out of a pair of stereo room mics on drums, or doing a parallel compression bus on a drum kit and smashing it through the 1178... a friend of mine will actually use one across the stereo bus from time to time as he says it makes his records "sound like a KISS record" but I've never been all that into the sound of an 1178 across the mix bus.

All in all... pound for pound, dollar for dollar... I think the Toft ATC-2 is a much better way to drop $1,000... the equalizer in the thing is quite cool, and the compression in many ways can sound very similar to the compression from an 1178... with the added bonus of being new, which means it probably won't require maintenance for the next several years.

I hope this is of some assistance, best of luck with your search.

Peace.