Bass-heavy multi-driver IEM?

Westone 3? I own them and love them. I briefly tried TF10's as well. I'd say they are very close overall. TF10 has slightly more detail, W3 has slightly more bass quantity. 

 

W3, also has more mid bass and a midbass hump.  Have you tried eq'ing for your TF10

Earsonics SM3

Any reason why you want to stick to multi-drivers? And by that, do you mean BAs? I listen to a lot of trance, dubstep, house and d&b, generes which to my ears sound better on dynamic driver based IEMs.  Also, if you're after more bass, dynamic drivers may well be the best way to go.

 

I'd naturally recommend the FX-700, or the FXT90 as a more cost effective option. I'd also recommend checking out bass heavy IEMs such as the IE8s or Atrios. If you want to stick with BAs however, I'd recommend the SM3, which I found to be very good with dance / electronica (though far less so that then JVCs).    

 

 

Go with shure, there excellent for bass

or you can get a JH16 pro with 4 bass drivers

or... better yet you can buy my 10 Driver UM Zeus with its 4 sonion 3300 bass drivers, its really toooo much bass for me man.

For multi-drivers, I'd also say the W3.

Hippo VB not multiple drivers but INSANE bass/sub-bass. If not go for SM3's