[ecnar]

Which IEM has the largest drivers? I know the Sony MDR-XB90 has 16mm drivers. Are there any larger than that for an IEM? If so, do they have more bass response?

 

[squallkiercosa]

Driver size doesn't translate in stronger bass response. Some of the newer IEMs come with micro drivers and their bass response are the same or even better than old bigger drivers. Stop wasting your time. 
 
Check out this thread
http://www.head-fi.org/t/573826/the-basshead-club

 

[rooster7618]

My Denon AH-C300 have two 11mm drivers in each ear, not sure it can get much bigger than that. Their bass response is huge, but that's what they were designed for. 

 

[ecnar]

Thanks, I am actually just curious to know how big IEM drivers can get. I have the Sony MDR-XB60 GOLD. they have 13.5mm drivers and have nice bass.

 

[mc21]

aurisonics asg-2 has a 15mm dynamic in it. Don't know of anything bigger than that but I guess you already named a 16mm