Hi, Just finished looking at this excellent thread comparing IEMs http://www.head-fi.org/forum/thread/478568/multi-iem-review-100-iems-compared-westone-um3x-turbine-pro-copper-added-08-18. Being new to quality IEMs I have a question. I have been fortunate to have been in the States last month and picked up some proper new IEMs cheaply (Klipsch S4, Sennheiser CX300 II, MetriFi170, and I got so excited I ordered some Soundmagic PL-30s online (spent under $120 for all - the S4s cost the most by far - I went on a shopping spree!) Anyway - why do some earbuds hate it when I turn the equalizer on with my Zune HD (Klipsch S4 sounds muted and aweful with it on - excellent without) and some do better (170s sound much better with the equalizer on). If earbuds need an equalizer, does it mean they are not good quality? The 170s on rock setting sound very close to the S4s to me - a little brighter - I almost prefer them infact - they were only $10. Secondly, will getting an amp (like Fiio E5 make my earbuds sound better - is it worth the money and inconvenience of charging and carrying it around? Thanks for reading my newbie questions. I should add that I eneded up with 4 pairs of IEMs and not one really good pair because I found the CX 300 IIs for $40 (they are $139 in Canada at my Futureshop) so I couldn't pass those up, the MetroFis were $10 - not bad for Ultimate Ears, I lost the receipt for the S4s so I couldnt return them after I tried them, and after looking online I decided because I like the wider soundstage the CX 300s have, the bass of the S4s, and the crispness and clarity of the 170s, the Soundmagic PL-30 seem to have all of these for $20 - I had to get them too.