I owned both the Audioengine A5+ and Klipsch R-15PM at the same time and was able to do some direct comparisons between the two. As far as sound quality, there is not enough difference between the two to justify one over the other. Instead you should make your decision on based on the sound...

Looks like the Ultrasone HFI-15G and eGrado might be worth looking into. 

I'm searching for an alternative the Koss Porta Pro and Sennheiser PX 100-II. Basically I want an open, lightweight, on-ear, portable headphone similar the aforementioned two. I like the sound signature of the Porta Pro okay, but find it lacking in fine detail. The PX 100-II is more detailed to...

I do wish there were more reviews out there. Especially comparisons with the Audioengines. Would you give a brief description of how they sound?

Pretty pictures: https://tinhte.vn/threads/phau-thuat-adapter-chuyen-tu-lightning-sang-3-5-va-tai-nghe-lightning-cua-iphone-7-co-chip-dac.2643511/

Sadly, I am not. I have heard good things about them, but never had the chance to hear them myself. 

To answer your first question about using your Audioengine D1 with the A5+: yes, in most cases using a DAC like the D1 will improve the sound quality. As to your second question about amps: in your case the D1 is a headphone amp, not a speaker amp, so it should not be a proble. Just use the RCA...

If the AV40 is too big then the A2+ is probably your best bet. You can get them refurbished directly from Audioengine for $200 if helps them fit your budget a little better. Like I said in my previous post though, Audioengine should be releasing the update to the A2+ the HD3 in the near future...

The best advice I can give you is buy from a place with a good return policy. The A2+ is a very polarizing speaker. You either love it or you hate. Without trying it it is hard to know on which side you will fall. So on returning it just in case you do not fall in the love camp. That said, as an...

I have been doing a lot of research on powered speakers lately and the Adam Audio F5 seems to favorite of a lot of reviewers. But it looks like it would beover your budget at $750 AUD. The Airmotiv 5s is a cheaper alternative to the F5, but I could not find a AUD price to see if it is in your...

A Google Shopping search for wireless Sennheiser Momentum turns up prices between $450 and $500. Sellers are saying February 2015 as availibity. Seems like Engadget is probably right about price.

Just get the SE215, it sounds like they will suit your needs pretty well. Are they the best you can get? No. But they are a well rounded IEM. They aren't the best at any one thing, but they do enough things well most people will be happy with them.

From The Wirecutter: From CNET

Why do you want to pick up a pair of ATH-M50? If you are looking to upgrade the ATH-M50 is not a big enough upgrade over the MDR-V6 to be worth it IMO. You would be better off putting your money towards something better if you want to upgrade. If you are just looking for a second pair of...

refurb, 30 day warranty, still seems like a good deal.