Gotcha.
Ok so now that that's out the way, going back to our previous conversation... Why do you insist on saving up more money for the A70 over the A30? Just out of curiosity. A30 is more than enough power for the Hifiman planars right? In fact the A30 itself is probably overkill, from what I can tell numbers wise.
More power doesn't mean better sound though right? Having more power than needed won't make it sound better.
That's what someone over at ASR told me anyway.
Is there some other essential advantage to the A70 over the A30 outside of more power?
Why not suggest the Topping L30 II if transparent power is the goal?
My thought process over the years have changed from, ''let's get what I think is needed and don't overshoot for extra'' to ''let's get what will overkill what I really need in case I decide to get something else that might require that ''extra'' I'm currently overlooking''.
A good example of that have been my Studio Monitors path. Started over two decades ago on Gennies 1031 in a professional studio to get myself a set of Behringer B2031 for my house. My mix was all over the place when I was working home and had to cross reference all the time on supposedly way less proficient system. I won't go step by step about my whole path but the point I'm trying to put across is, today, you're here on Head-fi talking about an affordable amp to feed your tiny GAS for something that will bring very small improvement compared to what's possibly achievable if planed on long term. ''Tomorrow'', you'll turn around and realize that you spent 400$ on something that is not worth 100$ anymore and it's way under-built for what's needed at your present moment. While I love my Nano's I know for a fact that there's way better built out there and the Nano's are just momentarily helping me reconciliate with the idea that Headphone can be proficient too if used in a correct manner.
So to come back to your question, my idea is that (and thats only my POV that nobody need to share) , If the L70 pro is borderline capable if you , one day, want to upgrade to a power hungry set of cans, why not invest the extra 300$ and make sure you have your base covered ? Cause lets be honest, the technology will evolve but given the specs of those devices, other then the power that will most probably always be a thing that some cans demand, you will never hear a -140 db noise floor nor will you ever notice a -120db crosstalk nor will you ever hear over 100 db of dynamic range. All of that is just way pass human hearing capacity.
So other then going electrostatic with a completely different type of power amp, I don't see you EVER retiring an A70 pro and it's 17W per channel at 16 ohm if you stay in the current state of devices that are available to us ( again, except electrostatic and a very VERY few Monsters out there ) .
In the end, it's your money and you do whatever you want with it but I personally prefer to stay put and not jump on a set of Audeze LCD-X just because it's the next baby step-up in my personal preference book and wait to get what I really need and be over with it. Just like I did with my Lipinski L-707 a few years ago and my Rythmik F12 this year.
I'm done buying 4 years crap and jumping into the next hype train over and over again.
EDIT: just look at what use to be considered the reliable workhorse for mids , the HD650. It appeared in 2003 and just recently been retired as what's best at what it does. That's almost a 20 years life span. And those example goes on and on.