Finally managed to get some Ortofon tips... I will add myself to those who think they are the best tips for the 334s. I take larges, and they are just about perfect. Everything sounds a bit clearer and more transparent, even over my former favorite tips-- Sony's previously-standard EX series silicones. For me, they help the earphone bodies stay more securely in place in my ears (they used to slowly back out sometimes), and just generally feel more comfortable. I will have to see if they give up any isolation, but the sound traits are great so far....
With the Ortofon tips now, along with the ALO cable, I would say these are anything but treble rolled-off.