I bought a pair of SE 530 (can be had for a decent price for NOS on ebay). I then had these fitted to a pair of custom ear molds.
The sound is superb (2 base drivers and a tweeter) and the custom airmold ensures that bass extension is full and solid.
The sound is superb (2 base drivers and a tweeter) and the custom airmold ensures that bass extension is full and solid.