First of all, you may not realize how huge these things are. They are massive. How big? Well... Roughly the same size as the K7** series from AKG. But without the small "nub" that can be found in the AKG design -- instead the driver enclosure extends back roughly an inch. I can almost guarantee a "holy crap" moment when you unbox them.
 
Audio Chain & Other HPs:
 
ODAC + Objective 2 (1/4 jack, rear mounted power, 1x gain) > TS-671, K7XX, ATH-TAD400
 
Ergonomics:
 
The clamping force is pretty tight at first, but it loosens to a comfy hug over time. You can always stretch 'em if you're in a rush. The velour pads are pretty comfortable. Not top of the line, but more than adequate. The cups swivel to fit. The cable isn't removable, but I don't consider that a problem at this price point. The 1/4 jack is a nice touch. Less crosstalk never hurts.
 
<-- Ratings:
 
Note that I set audio quality, comfort, and design a bit lower than what is displayed. This is a glitch that hasn't been fixed for years... Fix your crap, Head-Fi.
 
Materials & Electrical:
 
Well.. They're cheap. Don't discount fit or build issues. My pair has an overly tight swivel joint, but it's still usable. Just don't beat up on them too much. I think the first failure point will be the elastic in the headband.
 
These don't act like 120 ohm headphones on the gain knob -- if I were guessing I'd put them around 80. -shrugs-
 
Sound:
 
The selling point on these is their balance in heavy mixes -- they're my favorite all 'rounder. I sold my other headphones; these are what I'll use until I get some HD600s or Hifimans.
 
Unlike most headphones, which emphasize or drown out certain parts of a mix, these seem to allow perception of all tracks at once. I doubt they are flat F.R. headphones, but some sort of magic is at work in the sound signature. I'm pretty sure the midbass is recessed, but I find that satisfactory when listening to most consumer oriented audio because it emphasizes midbass. The midbass that they possess feels pretty tight too.
 
They're only detailed in the treble. Mids and bass aren't muddy, but they aren't "detail monster" grade. Every now and then during burn in/ear adjustment/pad adjustment they would sound hollow (like someone humming music in a public restroom) but that went away -- it turned into more of a concert hall sound. Visualizing my place in the hall puts me in the center of the second or third row.
 
Treble is sparkly and clean. I love it. Great with guitars.
 
Mids are warm-average and improve with break in.
 
Mid-bass is passable, but sub-bass is right where I want it. Good stuff -- especially for an open air set. There is a lot of punch, but not gobs of volume. I can hear the bass in Metallica's "...And Justice for All," which is astounding.
 
Soundstage is great. So is separation. I am particularly fond of where the vocalist is placed -- close enough to feel intimate, but far enough to sound like the singer isn't right in front of your face.
 
They leak sound like crazy. If you need desktop speakers in a pinch, hook these up and crank them.
 
Conclusion:
 
Blah blah great for the price blah blah. You've heard it all before. I won't bother hyping them. They're cheap enough to try without crying over if you hate them, so buy a pair.

Initial Impressions
 
Out of the box they are not impressing me. At all. Hopefully aggressive burn in with white noise will fix them. Otherwise they are headed for the return heap as defective. I'll update this after 12 hours or so. I won't even bother comparing them with my other 'phones unless the harmonics I mention settle down.
 
Sound
 
Treble:
Rolled off.
 
Mids:
Recessed and intruded upon slightly by the massive bass.
 
Bass:
The redeeming quality. Deep, punchy, and fulfilling.
 
Sound Stage:
It's difficult to hear anything over the painful frequency imbalances and harmonics.
 
Misc. Characteristics:
There seems to be a strange harmonic somewhere within the earbud's sound sig. I'll work on pinning it down, but it is horrid. It truly sounds like worn automobile brakes squealing (or really long and piercing cricket chirps). This song seems to trigger it constantly; I haven't heard any other headphones exhibit the same trait.
 

 
Creature Comforts
 
Build Quality:
These things are very impressive. They seem to be a blend of metal and plastic, and shouldn't break easily. They also have pleasant heft for a pair of cheap IEMs.
 
Comfort:
Even though the large disc shaped driver seems unwieldy, it rests in the natural curve of my ear and takes the weight off my ear canals. This will vary from person to person; I find it extremely comfy.

Because headphones are credentials on this site I'll list a few that I own. I'm a sucker for budget performers. I'm running a Sabre U2 Asych DAC to an O2 Amp. Because measurements.
Yamaha HPH-200, M-Audio Q40, Sennheiser PC360, Samson SR850, Samson SR950
 
If I had to sum up the sound of the DBI 700 in a few words I'd have to choose...
 
Fun V or U balance with minimal compromise and unforgiving treble.
 
Once you get past the fact that the stock earpads are medieval torture devices and replace them with something less painful, you can start appreciating the headphones. Since sound seems to be the most interesting thing about them I'll jump straight to that. If you don't know they're nigh invincible already I don't know where you've been reading.
 
Treble:
Very lifelike. Cymbals and other percussion have a unique closeness and sparkle. At first the cymbals sounded fake or grainy compared to other headphones. I thought about my experiences with cymbals in person and concluded that other headphones were wrong instead. Double bass drums have a remarkably powerful prat. Bass guitars benefit from the boosted treble in texture and harmonics.
 
Unfortunately, if a vocalist or mix is moderately sibilant it is painfully reproduced. The levels of sibilance aren't unrealistic, though. I think the phones are too honest for their own good. I had to lower my listening volume in comparison to my Sennheisers, which are extremely forgiving of such elements.
 
I tried to hate the sibilance, but its honesty to the music is slowly winning me over. I'm not saying that the 700s are neutral. They do, however, present a sound similar to a mouth-close-to-mic live performance with all the upsides and downsides included. Hopefully a pad swap and some foam pads over the driver instead of thin cloth will dull it a little... If not I'm damping the suckers.
 
Update: The treble's impoliteness seems be tamed a tiny bit by doing secondary burn in with Blue/Violet/Purple noise at HIGH volume. These headphones respond well to EQing. You'll find peaks around 8 and 10k.
 
Mids:
Nothing really special. They're tastefully balanced and possessing the proper presence for the intended sound sig.
 
Bass:
Punchy and fun midbass with enough subbass to balance things out. Very well executed. Detailed. These are NOT BASS LIGHT. I'd say they're halfway to bassheadphones. It's obvious in the sound, but not head rattling. The bass rarely bleeds into the mids and is, I think, at the point all consumer headphones should shoot for.

My audio chain is MP3@320 or FLAC > HiFimeDIY USB Isolator > HiFimeDIY Sabre U2 > Fiio 6" cable > Objective2 w/ 16v 400mA adapter > M-Audio Q40.
 
There isn't much I have to add to other reviews... They really aren't that great for anything other than bass and moderate detail levels elsewhere. At $60 they would be worth buying.
 
I advise buying a pair of Samson SR950s instead.

My audio chain is MP3@320 or FLAC > HiFimeDIY USB Isolator > HiFimeDIY Sabre U2 > Fiio 6" cable > Objective2 w/ 16v 400mA adapter > SR950.
 
The SR950s are fairly detailed headphones possessing a well designed V or U shaped sound signature. They can output massive amounts of clean bass. Without mid bleeding. Massive.
 
Whatever the sound sig is, it is very pleasing when listening to most music. They don't do classical well, but everything from metal, pop, and rap to rock is covered. The vocals remain surprisingly forward for a mild V/U shaped sound signature, and the highs are crisp.
 
They isolate well, have a heavy clamping force, and use velour pads. Comfy for me, but an easy fix is the classic box stretch.
 
The closest comparison I can make is the M-Audio Q40. Quite simply, the SR950 blows them out of the water. Cleaner bass, better overall sq, no overt sibilance, velour pads. The lack of a removable cable is their only loss in comparison.
 
I'd buy them again just for listening to metal/alternative/genres with heavy elements... That seems to be the area where they shine.
 
The sound/price ratio is excellent.

My audio chain is MP3@320 or FLAC > HiFimeDIY USB Isolator > HiFimeDIY Sabre U2 > Fiio 6" cable > Objective2 w/ 16v 400mA adapter > HPH-200.
 
If you are looking for a ~$100 on ear open can that has detailed but punchy bass (a rarity), a nice soundstage (nothing to rant about), and a well tuned mid-high range these are your best bet. They will probably pair best with a neutral or cold amplifier... Otherwise I think the bass could be unbalanced. It doesn't seem to bleed into the mids. Sibilance only shows up if it is not dealt with by the musician's mixing team.
 
The HPH-200 can handle pretty much every genre acceptably. Their utility keeps them from excelling at particular things... though the bass can get that crunchy edge for low electric guitar tunings and electronic music.
 
Comfort with the HPH-200 is good - velour! It beats the tar out of similar on ear headphones (hem, Grado).
 
The closest comparison I have is a Grado SR80i, which makes some vocals more smooth/lush at the expense of bass response and comfort. I'd pick the HPH-200 over the SR80i for everything that isn't all about vocals.
 
Buy it if you can.

When I received these earbuds I was not expecting much. I read reviews on the FX1X and FX3X, and both were laced with caveats. The few posts I found on the 101s said (more or less) that they were the least riddled with problems from the XX product line. In the end, I purchased them on a whim to have a pair of "fun" IEMs.

First Impressions:

The packaging is a royal pain to open. It's nigh upon bulletproof. The cable feels cheap, but has acceptable levels of microphonics. BE WARNED. The headphones themselves sound like crap out of the box. The treble is tinny and uncomfortably loud; the bass lacks extension/clarity. I immediately started them on a break in period of 12 hours at a volume above comfortable listening levels.

Post Break In:

That 12 hour period changed their sound somewhat, and more use will likely continue the trend. I cannot say anything objectively (as my ears may have adjusted), but subjectively it seemed like the tin can treble and shallow bass were helped mildly. The treble is forward, followed by recessed mids and a solid bass extension. In the words of another reviewer, "These earbuds are good for one thing - spewing gobs of bass." Of course, that sound is achieved with stock tips.

Recommended To:

People looking for a fun and cheap pair of IEMs with a "V" shaped sound signature, metric tons of bass, and a small soundstage.