After owning both HD681 and HD668B for quite a some time, I’ve been wonder regarding the rest of superlux products such as HD660 and HD330. They look pretty much identical with beyerdynamics headphones especially the HD660 where it looks exactly like the beyerdynamics DT770 pro. The price different is obviously large hence the question pops on whatever it actually performs the same with the DT770? Regardless HD660 has it’s own merits through. For female vocal lovers out there, this would be the best headphone you ever own at RM150 price range.



Unlike any other superlux headphones that I received so far, this one comes along with a solid, black colored headphone case which is pretty useful for portability purposes during travel. Inside contains the 3.5mm to 6.3mm plug audio adapter and the HD660 itself. Another unique feature for HD660 is that coiled cable are being used on it instead of regular straight cable that you normally get with the HD668B or the HD669. Coiled type cable did give some benefits over the straight ones through. One of them is that it prevents the wire to be clogged up whatever you’re listening to music,etc. However the cable on HD660 is undetachable unlike the ones from HD668B and HD669, meaning that you need to be extra careful on using the HD660 otherwise it would be difficult to fix it up whenever the cable issues comes up. By the time of writing, the HD660 has been burned in no less than 50 hours which personally I think it’s sufficient enough to show the readers out there what HD660 can perform on various genre of music out there.



I start off by listening to “SAKURA” by Monkey Majik. I found out that the vocalist sounds really sweet with this headphone. The sound separation between the vocalist and the musical instrument is clearly noticeable for the most part. Clarity wise, comparing with the superlux HD668B, isn’t that but the differences are pretty small to say the least. The bass is shallow to me taste through, but the sweet mids alone already covers off the lacking that I find throughout the song is playing.

Next would be “Fly Me To The Moon” by Olivia Ong. The mids sound very sweet and forwarded as well, way better then what I experienced earlier with “SAKURA”. The acoustic detail is clearly noticeable especially during the guitar solo performance being played at that time. The soundstage is pretty narrow to me through. The only good explanation for this is because HD660 is actually a closed design headphone. In theory the soundstage it produces would be smaller compared to the likes of semi-open and full opened headphones such as HD668B hence the reason why I’m experiencing this with the HD660. Minor sibilant can be heard from time to time though but that doesn’t actually ruin the great listening moment that I had with the HD660.

My only main concern on HD660 is that among any superlux products I tried so far, this includes HD681, HD688B and the HD699, HD660 produces the least bass which certainly will not entertain you when comes to any bass oriented songs you came across to. This reminds me of the Audio Technica ATH-AD700 which can produce the best mids you can find at it’s price range while at the same time I find that it lacks bass which is needed in some songs I usually listened to.

I did tried two of my headphone amplifier available at that time, the internal amp you found on the the maverick D1 and also darkvoice THA332 tube amp on the HD660. I do find out that with darkvoice it gives an improvement on the bass impact and a hell lot on the mids as well. On another hand however, the ones from maverick D1 give insignificant improvement to the HD660 which through this I can conclude that a more powerful headphone amp is needed to drive the HD660 to it’s real potential.

Overall, I do think that the HD660 is pretty satisfying to listen to especially if you’re an avid vocal jazz listener where the headphone performs best at. I do surprise that such a closed design headphone could produce such a low amount of bass, an opposite on what any other closed design headphone can do such as the beyerdynamic DT770. However this is how HD660 performs right now. I do believe that with a longer burn-in process, the sound signature would change to a degree that it might solve that bass shy problem that the HD660 suffers right now.

P/S : A big thanks to Trio for lending his HD660 for couple of days for this article. Also note that the article has been collecting dust since last year hence the reason why I didn't use the objective 2 headphone amplifier to test it out with the HD660.

Not sure. I always thought 681 and 669 will be the one instead since HD660 only sounds great on certain genres only due to it's sound signature it produces

@ertai : yes it has the best mids among all the superlux headphone I tried so far. If only the bass can be a little bit stronger...

Then getting HD669 would be a good choice for your needs. If you want cheaper alternative then HD681 would be sufficient

Haven't heard HD440 myself but HD660 is more on vocals but the bass impact is weak. Terrible for movies and games absolutely

Superlux announces two new headphones which is HD681MKII and HD662MKII

HD681MKII



http://www.superlux.com.tw/productInfo.do?...esource_zone_li

HD662MKII



http://www.superlux.com.tw/productInfo.do?...c&level=2&lv0=1

No idea. So far no one ever managed to get their hands on those

IMO I think HD660 would suit you well, vocal sounds great with it. Although HD668B is better on classical on the trade off on vocal music is just dramatic ( recessed mids to give in more treble ) hence I wouldn't recommend the HD668B in your case.

And yes HD660 is somewhat sensitive when comes to amplifier. Sadly FiiO E6 isn't enough to max it up from my experience. However through the mids still sounds good even without proper amplification on the headphones so you should be ok in the end I think.

Spend those money on DAC instead. Those give you the most benefit atm since amp at that price range doesn't give much difference on superlux

HD660 is really good on mid-range freq hence it should be good on the songs you want to listen to.