Well I replaced my old 80's Uher amp yesterday with a more current Pioneer one.
...I don't hear the difference

Not sure if I should just send it back to amazon or keep it.
Shroom, trust your ears and go with what you feel is best. There's nothing wrong with reverting back to your old gear.
Over the past 6 months I have gotten more into digital music. I have looked at a lot of digital playback solutions. Overall, the Bryston Pi is the best solution I have found, plus it hits a price point that even most non-audiophile people can justify. For me digital music is all about flexibility, so I have been using USB out of my laptop. I feel that this offers the greatest flexibility; there's a wealth of great content on archive.org. So all the recent focus on digital prompted me to pick up some gear. I obtained a McIntosh C47 preamp and MC152 amp. The DAC section of the C47 is pretty impressive and supports everything up to DSD256, as well as DXD 352.8kHz & DXD 384kHz, and everything else in between. Overall, it offers an excellent mix of analog and digital inputs and represents a great value at the price point. The capabilities of the DAC really are cutting edge. I haven't had a lot of time with the phono stage; however, early impressions place it as being very competitive with phono preamps in the $4K and up range. One of the best feature of the phono section is the ability to change the cartridge loading on the fly using the remote. Plus there are two inputs that cover both MM and MC cartridges. It was a toss up between this model and the C52. The only gain with the 52 is the meters, which I don't see the point of on a preamp, and the EQ controls on the front that I would just keep flat anyway. The 47 has bass and treble controls, but again, they will remain flat. The DAC section is identical. I really like the clean understated esthetics of this model.
The MC152 amp matches perfectly with the C47. Despite its compact size, it weighs in at 75 pounds. It features those famous McIntosh autoformer transformers, that ensure that it produces a minimum of 150 watts at any frequency with both channels driven even into a difficult 2 ohm load. Based on a recent review, the MC152 unit under review was bench tested at 253 watts per channel into an 8 ohm load and 225 watts into a 4 ohm load. Pretty impressive for an amp with a very conservative rating of 150 watts per channel. So far, I have been highly impressed. Great detail, dynamics and a very wide soundstage. Most importantly, it just sounds natural and right. This product also represents a great value at the given price point.
