Custom IEM of PKs

I am testing the Custom earpieces from
http://www.customearsets.com/, a professional hearing aid and pro-audio company located in NYC midtown. Starting their bussiness more than 20 years, they help a lot of famous artists doing their customer earpiece.
The earpieces improves PK2 a lot. With the earpiece PK2s are Shure-like sound, very very nice. Bass is improved and there is much more detail at mid range. When PK1s working with those earpiece, there are more details than PK2(with earpiece). For PK1, the bass part is a little too much, but this problem can be solved by adding resistors and controlling the length of the in-ear-tube. After I connect 75ohm ER4P-4S adaptor to those custom-IEM-PK1s, booming bass vanished. Sound become balance, neat, smooth and detail.
They ask $105 for each pair. Headfiers can call them and tell them you are head-fi member and maybe they will give you some discount.
RADIO PARTNER CUSTOM EARSET, INC.
243 W. 30th Street
New York, NY 10001
1-800-321-3364 / 212-967-7628
Fax: 212-967-9609
Reviews:
http://www.customearsets.com/Reviews/reviews.html