Reddit mentions of InstallGear 1ft Shielded 1 Male to 2 Female RCA Y Adapter Splitter Connector (2 Pack)

If you have the space for it a 5.1/7.1 home theater receiver will actually provided the easiest, cheapest, and best subwoofer integration since it's guaranteed to implement a proper crossover that high-passes the C-Notes (improving their power handling and clarity about the xover point) and low-passes the subwoofer. Accessories4Less is reliable and has great refurb deals. They'll also put out more clean power than your typical compact Class D amp.

Of course, there's not always space for something like that.

Compact amps with subwoofer out are annoyingly hard to find. The SMSL AD18 and Q5Pro have subwoofer output, but are a bit pricy. They don't get super super loud, but should be plenty loud enough for practice or as monitors I guess! Keep in mind that their sub outs aren't high-passed so the C-Notes will still play full-range.

Alternately you could choose any old amp, and simply control the volume upstream from the amp. Then you won't need a subwoofer out on the amp.

(RCA splitter) --> (inline volume control) --> (piano)

The amp would go into one set of RCA outputs and the sub into another.

You could of course skip the inline volume control if you can simply do it on the piano!

> Main goal is to get distortion free power that won't starve the speakers, so I'm thinking it should probably put out 40 watts per channel at a minimum? I could be wrong there, parts express has the cnotes rated at 60 watts RMS.

If you're going with a class D amps in the $100 range, look for amps rated at around 100W per channel -- typically based on the TDA7498E like the SMSL SA98 and Topping PA3. That "100W" rating is at 10% distortion. However, they'll do 50W at nice low distortion levels, giving the C-Notes about as much clean power as they can take.

However, if you're just using these for practice from a distance of several feet you don't need to go that big. A "50W" class D amp will give you around 25W of actual clean power, which is pretty damn loud at close range and is only ~3dB less than a 50W amp and 6dB less than a 100W monster.

Infinity Reference 5 channel amp - $239.99

[4 AWG amp kit] (https://www.amazon.com/Rockville-RWK4CU-Copper-Complete-Installation/dp/B019Z3RCG2/ref=sr_1_6?ie=UTF8&qid=1550159767&sr=8-6&keywords=4+awg+amp+kit) - $49.95

9 wire - $24.95

Additional RCAs - $19.99

4 channel LOC - $23.34 - You need this because you're keeping your factory radio

RCA splitter - $7.45 - To get the 4 channel LOC to 6 channels for the amp's input. There's maybe other ways you could do this, but this is what I would do because it'd be the simplest to swap the radio in the future.

Infinity Reference 6.5" for the doors - $56.95/pair x 2 = $113.90

Infinity Reference 3.5" for the dash - $48.70

= $528.37 + Installation which will easily run between $200 - $350

If you'd like to spend a bit more you might ask about sound dampening on the doors. Or you might save the extra and put it towards replacing the radio in the future.

So first, to connect your DAC to your computer, you'll need a usb A to B cable like this one. Most printers come with one of these, so you may have on laying around that you're not using. Plug the A (regular USB) end into your laptop, and the B (the square one) into the USB input on the DAC.

Next, you'll need two RCA splitters like this, one for the left channel, and one for the right. Plug one into each of the outputs on the DAC (male end into dac, 2 female ends hanging free).

To connect the subwoofer, you just need a regular RCA cable like this. Just run one side of the cable from one of the ouptuts of the spitter connected to the left channel on the DAC to the left input of the sub, and the same for the right (after this, you should have one output used on each of the two splitters).

Finally, to connect your speakers, I think the simplest way would be with the RCA to XLR cables (sadly, you'll need two of them, so you'll have to pick up another). Just run one from the free output on each of the splitters on the DAC outputs to the XLR input on the appropriate speaker (left or right).

Obviously, for each cable, get whatever length is convenient for the positioning of all your components.

I have that FiiO. The USB input is only for power, unfortunately.

There are similar DACs that do USB, but none with two RCA outputs. Your best bet is to use one of those and hang 2 RCA y-adapters off the RCA output.

https://smile.amazon.com/Signstek-Coaxial-Converter-Convert-Analogue/dp/B00FEDHHKE/

https://smile.amazon.com/InstallGear-Shielded-Adapter-Splitter-Connector/dp/B01CT68CRU/

yes, you can use them to run a signal to your powered sub.

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you are going to split each l/r "Pre Output" RCA via a Y cable. then you are going to take a regular RCA stereo pair back into to the "Main Input" and the second leg of the each Y goes via a second RCA Stereo pair to the Input of your sub. this allows the volume control on your sansui to control the volume on the sub.