Equalization for vinyl nirvana

To be fair to graphic equalizers, I admit that my opinion of them is now based on old data.  Once I had heard several that were commonly available in the "old days", meaning more than 20 years ago, I gave up.  Plus, the trend for the past 30 years has been away from electronic methods of altering the frequency or tonal balance of the output, which has resulted in the total absence of tone controls from modern preamplifiers.  It's fair to say I am not up to date on the latest best equalizers.  But it seems that the OP is interested in two devices that fiddle with the RIAA equalzation curve; they are not typical graphic equalizers, which was partly my point. 

Clearthinker, the two devices that the OP says he would consider buying to solve his problem are not classic equalizers. Both afford ways of messing with RIAA equalization. Actually, though I personally wouldn’t go there, either of those devices is preferable to a typical graphic equalizer, all of which s&&k. These days we also have equalization that acts in the digital domain. I’d be interested to hear what that does. Very expensive.

I would do a lot more listening using a much wider variety of musical genres and the highest quality recordings in my collection, before I would think of adding an equalizer.  And if there are consistent deficiencies in tonal balance, a told to me by my ears and brain, I would first wonder about the room EQ, then tonearm and cartridge, again before thinking about an equalizer.  Of the two devices you reference in your OP, one (Sun Valley) seems to be a way to make slight alterations in the RIAA equalization curve, and the other (Decware) seems mainly to be a way to enhance bass response from vinyl.  All the LPs we own that were recorded after the mid- to late 1050s were made with the RIAA curve in mind.  Yet not all of us sense the same problems that you sense, so it is unlikely that the RIAA filter per se is a problem. Those two devices are both interesting toys, and who is to say that you would not like either of them?  Not me.  But first I would look elsewhere for a cure to your malady, as I noted above.  I admit, that approach can end up being more expensive than just buying an equalizer.  By the way, conventional "graphic equalizers" that offer a series of narrow band filters in the audible frequency range, are a definite no-no, in my own experience of them.