features filters for the advanced review search function

[CottonCandyLover]

I was looking for a headphone amp today and tried to use the search function. Filtering by Sinad was not very useful to me, because the good modern headphone amps peform pretty much flawless in the audible range.

I would have loved to filter for the features I would want in my amp:
- internal power supply
- balanced inputs
- 4.4mm output
- ladder / digital volume control

I think people would benefit from an added features section in the reviews and the search to make it faster / easier to find what you are looking for.
It would also be possible to just add more values to filter by like channel balance, power output etc.