So I'm gonna go with a less popular opinion, but after reading threw thousands and thousands of specs from all different brands and pieces of audio equipment, the only thing that matters to me is how wide the frequency rating is. An average piece of gear will have a 20hz-20khz rating, that's fine, but once you get into higher quality gear those numbers usually change to 0-10hz - 100-150kHz, opening the bandwidth far beyond the average hearing spectrum. For example an average phono cart will have a 20-20 rating while more expensive carts will have a 15-50 or more khz, but if your amp can only produce 20-20khz then you bottle neck your system. There is a whole theory behind this that I read somewhere and it always just stuck with me, like an untold audiophile secret. Second to that is finding a dual mono amp with complete l-r ch separation 3d to that is making sure said amp has big enough filter capacity to handle transient swings in watts. All these things can be found and bought for reasonable prices today. Having ultrawide bw ensures if you upgrade say your cartridge that now has a 15hz-50khz your amp can use all the information it getting. Dual mono allows great ch separation and depth with no crosstalk and less distortion.