Please Help Me Refine My Recording Setup
@iternabe that's right. 4 XLR inputs. For me, in retrospect, the audio interfaces at this level are pretty similar in quality - I'd spend the money on the Mics. Audio processing tools are very sophisticated nowadays - you just need a low noise preamp, and I think most offerings are similar. I did buy a used Tascam and a used Zoom H4n before settling on a Zoom H4n Pro. The former two were crazy noisy. Check the noise specs before purchasing, but I think most new stuff nowadays is fairly decent, especially if they are usb interfaces, and not dedicated "handy" recorders.
I use a Blue Yeti USB mic as input plugged into my Mac running GarageBand. Sound output through Edifer bluetooth speakers. It works OK, but I'm not entirely happy with the sound. I've lived with it because I only record to get the perspective of a listener, which does in fact reveal a lot that I cannot hear when playing. I'm not recording for other people to listen to me play; it's just for my edification.
Garage Band comes with a bunch of equalizers, and I use the Grand Piano one with some modifications. The Yeti mic is on the cardioid setting, and the gain is turned down to zero, as even a little gain results in clipping. (The Edifer speakers aren't great, either, producing a muffled though accurate sound.)
Any suggestions for improving my current set-up or another one that's equally simple?
AaronSF Edifier speakers are good for general use. I am not sure they can be considered accurate, though. Good quality studio monitors are designed for fidelity. It’s a big decision to buy them, because of size, and cost.
Alternatively, you can start with using a good pair of open back headphone. I have several pairs of Sennheisers. The HD600 is most accurate and neutral, but its high impedance requires a headphone amp. The HD558 (or 598) has lower impedance, and is quite good, too. When you EQ, judging the result through the headphone will make sure you are adjusting for good sound, not adjusting to compensate for deficiency in your speaker.
Also, have your tried moving the mic farther away? That should give you better headroom to avoid clipping.
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iternabe Thanks for your response. I appreciate it.
My set-up is designed so I can use it in conjunction with my practice, hence I didn't mention headphones. I have some Grado 325sx's, and yes, the sound is much improved through them, but as I'm listening while practicing, turning the recording on and off, stopping at problem areas and working on them, then listening some more, etc., I find the Edifer speakers more suitable to my purposes. I'm not recording for other people to listen to, just for me to approximate what a listener might hear so I can see where I hesitate, where my articulation is uneven, how consistent my tempi are, where I'm using too much rubato, etc.
I have tried placing the Yeti mic in lots of different places, in and out of the piano, and the best placement so far has been inside the piano about 1/2 back from the front, in between the treble and upper treble. Putting it outside the piano has always resulted in inferior sound.
I know better speakers would help, but it's a balance between the convenience of a blue-tooth & usb setup on the one hand, and a more complicated arrangement of better mics and better speakers. My current arrangement is light-years better than the crappy Tascam recorder I was using!
I'm also relatively naive about the intricacies of GarageBand. I know it is overkill for what I'm doing, but I don't really know of a simpler alternative. For instance, I can adjust the gain a little in GarageBand to improve the sound, whereas adjusting gain at the Yeti even a little results in clipping. (I'll try listening through my Grados and seeing if I can adjust the gain better.)
And as I said I have tweaked the equalizer to maximize piano sound.
I can live with my set-up fine, but all the responses here made me think maybe someone has a way I could tweak things or do something different without going whole hog into sound engineering. 
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@Pallas I don't know if you have finalized your recording setup or not. Just want to report a recent upgrade that worked really well for me.
I typically record digitally from the output of Pianoteq. But I did set up a large condenser microphone (Marantz MPM-3000). It picks up the metronome, room reverb, and ambient sound. It's a superb vocal microphone, but worked only okay for the piano. And it's mono.
Last week I acquired a pair of Behringer C-2 ($50, Sweetwater via eBay), and a Focusrite Scarlett 2i2 4th Gen ($140 used via Guitar Center). They worked superbly well. Other than the ambient sound being picked up by the mic, the piano sound between the mic recording and digital output from Pianoteq is almost indistinguishable to my untrained ear.
The Berhinger C-2s are small condenser microphone more suitable to pickup sounds from musical instruments. Condenser mic (without built-in amp) need 48v power. That's why an audio interface with at least 2 XLR inputs and can supply 48v to both is needed. Focusrite Scarlett 2i2 is a popular amateur choice for that. The 3rd gen will work just fine. But the 4th gen has improved signal to noise ratio.
A portable field recorder that has XLR input and 48v can work with the C-2 as well. But since I record to a computer, using an audio interface and merge the audio and video in realtime is real convenient.