Your impression sounds like a Jh16 to me, if you drive on a high output source like iMac. Jh16 IS in "bass-always on" mode. It's not for listening all genres of music. The bass does cover some of the upper mids and upper treble. But jh Audio does create a peak at 8k to balance the overall brightness. I think the best thing to do is to switch to a Jh13, don't go with Jh3a since its not going to make any sound signature change.
Also if you want more clarity and detail you should boost above 11k, not 8k cuz it will more your jh 16 more compressed with very forward instruments.
Here is a eq setting I use (not random, I spend weeks trying to make my jh16 sounds most neutral and accurate to my ears), if you still have them you can try, but you will need a UI or software that can choose exact frequency band and Q values.
200hz -2 db q:1
2000 +3 q:1
3000 +2 q:1
8000 -6 q:1.2
13000 +1 q:1
14000 +2 q:1
15000 +3 q:1
Above 16000 +4 q:1
You can also reduce 1-2 db at 10000 if you think this setting sound a bit bright.
Now it should sound smoother and very detailed with punchy bass. You don't need to do anything to bass now because you already balanced high frequency.
If my description is the sound of JH16's then I wonder how everyone is praising the clarity and accurate bass reproduction. Looks like we have mixed opinions here.
I don't like flat sound but I don't like boomy compressed-congested either.
We are not talking about Dr. Dre beats are we ?