Looks for Headphone Tube Amp

USB from computer to E30 should work fine.  The Toppings will probably require some hours of playtime to break in and sound their best so try not to judge too quickly.  Let us know what you think. 

@soix i hope it’s alright I keep running questions by you. If not, just lmk and I’ll stop blowing you up for advice haha

any RCA cables you’d recommend to connect the L30 & D30?

also, any USB to lightening male/male cables you’d recommend to connect D30 to a MacBook?

No prob whatsoever. I’m just hoping this all works out well as everyone’s tastes are unique.

Anyway, you’re probably gonna hate me for this, but to me cables matter like tires matter on a sports car — underspend and you can ruin the whole experience, so what’s the point? That said, if I’m you I get an Apple USB 3 adaptor ($30) and either an AudioQuest Cinnamon ($80) or DH Labs ($70) USB cable. And, to make it worse, I’d also strongly consider getting an iFi Purifier3 ($129) to insert between your computer and DAC because computers are very noisy sources for music and will degrade your listening experience. You can always return it if I’m a liar.

The only thing I’m not sure about is the USB 3 adaptor for the MacBook because I don’t use a MacBook, but you need a way to get from the Thunderbolt/Lightning port to USB and this is the only thing I know that does it unless there’s another/better option. Anyway, that’s my rabbit hole if you choose to jump in.

@soix i’m definitely going to jump in! This is all super helpful. I really appreciate your advice.

I was looking for a record system last year and tons of folks  had the same perspective on cables as you. Haha I think it simply means your opinion is in good company w me: I'm a believer in good cables after reading everyone's responses. I definitely want to invest in making this as nice as I can on my budget.

Slowly been assembling everything, i should be finished by the end of next week. I’ll keep you posted on how it all sounds when i've assembled It all! Thanks, again, for all your advice!

Yeah, don’t thank me til you’ve heard everything hooked up and run in a bit.  Realized I forgot to include interconnects — I think 0.5m Cullen Cable Copper Series RCA for $85 should work very well and hopefully not break the bank.  Look forward to hearing your impressions.