If you google GR07, the first picture is of them fitted in an ear. You want the cable strain relief to point forward and then wrap around the back of your ear. If there is no bass, then you have no seal. This will be the case with any IEM you buy - it's imperative to get them fitted properly for the best response. If they are just sitting on the outside of your ear, they will not only sound terrible but fall out. These are non-deep insertion tips, so there is no risk of damaging your ears. In order to use them with your NI AK1 you'll need an adapter like the one in your picture above, they can be found on Amazon or Ebay. Try searching for 1/4" to 1/8" Adapter or TRS adapter. With a proper seal, these have the best bass of any non-deep insertion IEM I've heard to date apart from Sony's former flagship EX1000. If you are a one who enjoys 'quality' bass, the kind that is well textured, extended and doesn't ruin any other aspects of the FR, then yes...they are about as 'basshead' as you can get in an IEM. If you only want bass, then yes...you'd have to look elsewhere. No monitor-type headphone is going to have out of control, forward bass. You'll likely know when you have a good fit, and after that just give them a week...you are entirely used to the DT770's signature so you need to let your ears adjust to the GR07. Also as you may have read, these require some burn-in to tame the treble if that becomes a problem for you. I believe 75+ hours is recommended.