Perfect Sound d901b


Headphoneus Supremus
Pros: Bass extension and impact/slam is present and superb, easy to drive, comfortable enough, it's pretty.
Cons: Bass overpowers mids a bit, design is too "Beats-like", clicks and bangs due to metal enclosure, too sensitive and earpads ARE NOT replaceable!
I still don't know why I keep buying headphones, really! I thought I was done but no, headphones like this one have to pop up on my radar and I'm weak enough that I have to buy them! Even though I already had what I considered my prefered headphones (Ultrasone Signature Pro/DJ and MrSpeakers Mad Dogs) I still wanted to try these just because I read they were very bassy. Being a Signature DJ owner (and a Denon D5000 owner as well), I wanted to try them and verify if indeed it would satisfy my "basshead" needs from time to time.
Let's get this out of the way, I'm happy to report that they do indeed satisfy! 

Perfect Sound Dido D901 Stats:
Driver Diameter40mm
Driver TypeDynamic Speaker
Impedance @ 1kHz16 Ohms
Connector Type3.5mm
Cord Length1.3 meter
Headphone Typeover-Ear
Package Contents:
  1. Headphones
  2. Good looking usable stand
  3. Green 3.5mm to 3.5mm cable
  4. 3.5mm Stereo Female to 6.35mm (1/4) converter
Design, Comfort and build:
Before delving into the sound, let's talk a bit about the headphone's looks. I have to say that, to me at least, they LOOK STUNNING. All metal construction, ear cups look spectacular from any angle, the white color gives it a nice contrast, it has a bunch of different etchings with the perfect sound name, spiders, shapes, etc. and they look a bit different from other headphones, that is until you really step in close and tell yourself: "heeeeyyy wait a minute! These are basically Beats made with metal/chrome parts and a cool comfortable headband!" I mean, the cups (and earpads) look similar, yokes as well, etc. Yeah, a bit disappointing. Even more disappointing is that they fold "incorrectly" (the wrong way). Maybe they just wanted to not make them TOO SIMILAR to the Beats! 

Like a lot of headphones lately, these guys also have dual inputs so you can use either side which is cool depending on your arrangement.
So in my eyes, although good looking, the design is not a strong suit for these...
One of my main nitpicks with MOST headphones is the comfort factor. If they are NOT comfortable I don't care how awesome they sound, I wont keep them. Even though these are mostly made of metal and the earpads don't really articulate that much, they are actually comfortable (at least I find them more comfortable than the Ultrasone line.) They don't clamp as much so that's probably why they feel good while wearing them. No pressure up top (unlike headphones such as Yamaha Pro 500) either. Overall I like how they feel and I can listen to them for hours!
Now regarding build... shake, rattle and roll... I guess one of the downsides of building a mostly all metal headphone is that every time you move harshly you will hear clicks and bangs all over the place. Heck, when you pick them up you might think you broke something since they make all sorts of sounds. I have to say though at the same time they feel robust, and look like they seem to be built to last. Time will tell! (at least I don't expect to break like the usual Beats do!)
Now to the most important thing... These impressions are done using/listening my usual test songs with my usual home setup consisting of: Nuforce Icon HDP --> Lehman BCL
Damian Marley - Welcome to Jamrock
Thrice - To Awake and Avenge the Dead
Miguel Bose - Este Mundo Va
Kaskade - Fire in your Shoes
Blink182 - Kaleidoscope
Jon Cleary - When you Get back
Mima - Oigo Voces
Esperanza Spalding - What a Friend
Sara Bareilles - Vegas
Killswitch Engage - Fixation on the Darkness
Juancho - Pillala
Boston - More than a Feeling
J-King y Maximan - Ella me Pide Something
Calvin Harris - Feel so Close
Three Six Mafia - Late Night Tip
Orquesta Macabeo - Me Repito
Let's start by saying: Daaaaamn! Be careful when using these cans. They are SENSITIVE AS HECK! At times I thought that these guys wanted to blow up my ear drums! They go loud pretty fast from either my set-up, straight from a FiiO X3 or my phone! SO again, just a warning if you are planning on getting these! LOL
These have MONSTER BASS! Extension is superb (I can "feel" these rumble at 15Hz), sub-bass is plenty powerful (almost headache inducing when playing Three Six Mafia - Late Night Tip) and mid-bass has enough impact to take care of low bass notes, double kick drums, etc.! Reggaeton music excels on these headphones, as well as Hip Hop and bass heavy songs. They definitely are boosted (i.e. mid-bass with respect to sub-bass) and I feel that they are not super fast since there's definitely a bit of "smearing" into the mid range. Still completely understandable though, these were made for bass-heads so I wont cry too much about that. 
Even though bass is indeed boosted, I don't find the mids too recessed at all, upper mids in particular (since I feel lower mids are a bit "laid-back" possibly due to the bass eating a bit of it up!). Playing tracks from Esperanza Spalding, Sara Bareilles, Fiona Apple, and other singer/songwriters, I don't feel I miss either any detail, clarity, or resolution. They sound splendid which is a bit surprising. In fact, I can say that mids on the Dido's are more up-front and in-your-face than my Signature DJs. Tracks such as "When you get back" by Jon Cleary sound very very good and fun. Piano notes are rendered beautifully to my ears, so I have listened to a lot of Ms. Bareilles as well. And talking about "in-your-face", I feel the highs have more air as well (compared to the Sig DJs). It seems there is also a bit of a boost in treble (2-4Khz) as well since sometimes violins sound a bit, I dare say, unnatural, but other than that, highs are NOT ear-piercing, they are NOT shrill, they don't "introduce" sibilance, they are detailed, extended and make the headphones just fun overall. Having these qualities (bit of a boost up-top, air) actually helps with imaging as I feel they also excel on that front and on some non-bassy tracks I actually prefer these over the Signature DJs.
Very good bassy presentation, Good upper mids (female vocals sound excellent and so do pianos, acoustic guitars, etc.), Good highs (no sibilance, energetic but never shrill) and Sound Stage/sound separation is very good (I find them better than the Signature DJs in non-bassy tracks) and all of these traits make the Perfect Sound Dido D901s one of the best basshead headphones I've tried!
If I were to order closed BASSHEAD cans by preference (the ones I have tried)
Comfort: Denon D5000 (modded or not) --> Denon D600 --> Beyerdynamic DT 770 Pro80 --> Perfect Sound D901 Dido --> Ultrasone Signature DJ --> Monster N-Pulse --> M-Audio Q40 (with Beyer pads) --> JVC HA-SZ2000 --> Spider PowerForce --> Panasonic RP-HTF600-S --> V-MODA M100 --> Yamaha Pro 500 --> Skullcandy Mix Master Mike
(this is taking into consideration both earpad and headband feel)
Sound Quality: Ultrasone Signature DJ == Denon D5000 with Lawton Mods --> Perfect Sound D901 Dido --> Yamaha Pro 500 --> V-MODA M100 --> Monster N-Pulse --> Denon D600 --> M-Audio Q40 --> Beyerdynamic DT 770 Pro80 --> Panasonic RP-HTF600-S --> JVC HA-SZ2000 --> Skullcandy Mix Master Mike --> Spider PowerForce
(note, ALL of these have from good to great sound and some are "special" on specific genres, but when nitpicking, this is how I would choose them)
If you are indeed reading this is probably because you are bored, or a basshead so that means that you are not looking for neutral, for analytical or cold sound, you are looking for BASS BASS BASS! Again I say, these cans deliver!
Just like on my Yamaha Pro 500 review, If you ask: "well, why should I choose these instead of the M100s, Denon D600s or any other "bassy" headphone?
And the answer is always, depends on what you are looking for... Some people like different styles, some people have different ear/head shapes, some people like more/different accessories, some people might value comfort more than anything else, etc. As above, if only interested in the best sound, I WOULD rate these VERY HIGHLY over most basshead headphones I've tried with the exception of the Ultrasone Signature DJs and the Denon D5000.

The other usual question would be: "So should I pay $800 for basshead headphones?"
And I would say... if you can get the Ultrasone Signature DJs for similar price, well... go for those! :p
But in reality the law of diminishing returns is VERY real and you might find similar enjoyment from the V-moda M100s or even the Monster N-Pulse headphones (which I do liked QUITE A LOT and got them cheap!), it's up to each individual to choose whether they like the design, whether they can actually hear the differences and then decide if the difference in price is worth it or not.
I have to say though, to me, and after side by side compares, THESE ARE WORTH every penny!
As always YMMV, it all depends on taste! Hopefully I could provide an idea with these impressions and whenever one has a chance to test all or any of these headphones I have mentioned, do it!!!
Always trust your ears.
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One of my favorite movies ever! Had it in VHS, DVD, etc. Also have the CD soundtrack! (Discovered bands like Lustre there... VERY underrated band, only 1 CD though I think). Anyway, I even knew most of the dialog... still do actually! "Empire Records open till midnight This is Mark!.... ... ... MIDNIGHT!!!" :wink:
A tour sounds like fun! :wink:
GREAT job @gelocks !! We had a BLAST reviewing these for, @warrenpchi and me.  A terrific read and nicely laid-out too!! 
Thanks Mike!


1000+ Head-Fier
Pros: Sound, easy to drive, portable
Cons: Cable, design see below.
Okay, my friend saw these at the newport show just recently and was lent a model. The company Perfect sound originated in taiwan and the term "dido" stands for spider in taiwanese. The director is a nice taiwanese man that works with the company to build headphone drivers for other companies such as akg, senns, dr dre etc etc.
Design - The d901b is a closed headphone with a metallic finish that looks astonishing, the cups look like it could belong in a display room OR some kid with a silver spoons' room. The headband is pretty high quality and seems quite stable. The right and left side of the headphones I feel as if they could've done better on the movement of the head size adjustment, but not much to complain here. A small complaint that I have is the cable. The cable was one of the reasons why my first impression / look was "another monster headphone?" (I haven't dissected the cable and or don't plan on doing so). The cups do have a nice feel to them but if your ears are immensely large like mine, you may have to do some adjustments to get the perfect fit.
Pricing - This is for sale @ moon-audio for 780, quite a decently marked price point.
Sound - I'm sure you're all waiting for this. How does it sound? Well let me give you headphone similarities first. First headphone it comes similar too is an ad2k. The sound is VERY energetic so for dubstep lovers this is definitely the headphone for you the sound isn't bright nor is it dark and on some tracks it could be either or. Bass, very amazing bass one of the most impactful energetic bass I've ever had, actually the bass is somewhat quite similar to the tg334s. Also, I listen to a lot of kpop/jpop/jrock so this headphone seems to have been built around that (it's what I feel at least). The one thing I really love about this headphone is the treble, such sparkly treble I feel as if there could be a giant clash in the high frequencies and destroy my ear but it just stays so impactful, detailed and doesn't go haywire. Most of the music I listen to has harsh treble and or has a very peaky voice and even in headphones like the lcd-3 I still feel as if theres quite a bit of sibilance - this headphone? - NONE I was actually very surprised of how there was no sibilance on my "sibilant spot" in the song even when I was expecting it to come waiting for my finger to turn down the volume. Now for the midrange, I just love it's energetic appeal it's always thrusting impact guitar strums and voices right in my face while not covering up the lows nor the highs I just don't see anything wrong with it. The one thing this headphone really excels at is the guitar, this could be due to the metal chassis that adds towards the sound factor giving it a metallic sound which I love and at this very moment still love.
This is just my 2 week or so review, I may update later down the road.
Amps / Dacs driven - DX100 / AK120 / Leckerton UHA6 - OPA 209 - 627 / iPhone 4s / Liquid Glass stock, some other tube that my friend had.. forgot / nuforce HDP. Dynamics are very good with this headphone as well, and is driven pretty easily with a 4s for extreme portability.
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