lol , i jus noticed tat 330 n 660 spec r 99% da same...   only diff(1%) is 330(open type) n 660(closed type)

330
Type: Dynamic , semi-open
Driver: Ø40 mm, neodymium
Sensitivity: 96dB SPL (1mW)
Frequency Response: 10-30,000Hz
Max. Input Power: 100mW
Rated Impedance: 150Ω
Ear Pads: Leatherette 
Cable: 3-meter (9.8 ft.) coiled, single-sided cable
Connector: Screw-on gold plated stereo mini plug
Headphone Caliper Pressure: Approx. 6 N
Net Weight (with cable): 300 g (10.58 oz)

660
Type：Dynamic, Closed-back
Driver: Φ40mm, neodymium
Sensitivity: 96dB SPL (1mW)
Frequency Response: 10–30,000Hz
Max. Input Power: 100 mW
Rated Impedance: 150 Ω
Earpads: leatherette
Cables: 3-meter (9.8 ft.) coiled, single-sided cable
Connector：Screw-on gold plated stereo mini plug
Headphone Caliper Pressure: Approx. 6N
Weight (with cable)：250 g/ 8.8 oz

tis is interesting from Superlux... im getting more exticed nw !

Hello guys...I am thinking on grabbing those HD381.    From the review its mentioned it poorly built quality. Anybody who have the HD381 could share his/her personnel opinion on the build quality. 

And regarding the SQ, if compare HD381 with Hippo Grove or Sound Magic PL20 or PL21.  any one who have these could share some thought.

Thanks. 

huh? what? compare with multiple drivers IEM and it is comparable?
they are serious or joking?
then those ppl who bought those IEM will consider stupid because of buying overprice IEM???
all those big company such as UE, westone, Shure definitely going to close down soon because of superlux??

Yes, yes I am.   I cancelled my order but went back and order again. 
I don't have any IEM/headphone that is neutral though, so all I can do is tell you which one(Gumstick or C30) makes my IEM sound like what, the best to my abilities that is. 

Jus saw on TV, M'sian artist using Superlux products (681 & 660) in a video clip...

wei, u got artist customer ar bro Trio ???

Bro camry, who are those people in the picture? Local artist?

can anyone here tell me wats the diff between HD668b and HD681, cos these 2 cans really impressed me...... pls give me some guidance.~~

hmm........ which will u recommend as if i use the headphones for music like R&B and some others bassy song? 

or like i shld place it as "all-rounder"....~~^^

price differ greatly?

OMG!!!! just watched american idol replay and saw Marc Anthony wearing Superlux HD-330 !!!!