First off before I start this review, I would like to thank Mark McGonigle from MonoPrice for staying in touch with me to make this review happen.

Packaging:
Packaging for the headphones was very clean, straight to the point of what you would be buying if you saw this product on a store shelf, professional. The cardboard on the box has a nice matte black finish that will catch your eyes as that was the first thing I noticed when I took these out of the shipping box when I received them.


Unboxing The Goods:
First thing you'll notice once you open the box are the headphones them self and a 1/4" adapter, underneath the plastic shell they're sitting in is the 11.5 ft and 50" inch long 3.5mm M/M cable.

Included in the Box:
1x MHP-839 Pro Headphones
1x 11.5 ft long 3.5 mm M/M audio cable
1x 50 inch long 3.5 mm M/M audio cable
1x 3.5 mm F to 1/4" M adapter plug



Specifications:
Model Number: MEP-839
Driver Unit: 50 mm
Impedance: 40 Ω
Sensitivity: 100 +/- 3 dB / 1mW (S.P. L at 1 k Hz)
Frequency Response: 20 Hz to 20 kHz
Wire Length: 3500 mm (11.4')

First Impressions:
After opening them up and inspecting them a bit the first thing I noticed was the build quality and how sturdy the plastic was, nothing felt cheap to me. Very well built.
I listened to them for a few minutes straight out of the box. They had a warm sound signature to them but nothing really stood out at that moment.

Another thing to mention is one of my thoughts that came into my head was of how similar these look in comparison to the Kicker HP541 headphones, I believe these are an exact replica of the Kicker headphones without the Kicker branding of course.

Headphone driver's of the Kicker HP541's and the MonoPrice DJ Headphones.


Side Notes:
After unboxing them and listening to them for a few minutes, I let them burn in for very close to 100 hours now via looping Pink Noise before I started writing this review. I was listening to them as I wrote this review.

Lows:
After listening to these for a few hours now and comparing them with my AKG K81's that are my most bass heavy pair of headphones I own I would choose these MonoPrice headphones over my K81's for general music listening. The bass extension in these headphones are very pleasing to me, the bass can be a bit muddy at times but it doesn't overpower the mids or highs but smaller details seem to get covered up at times.

You'll feel the bass and hear how dynamic it is. I enjoyed the fact these weren't punchy or overwhelming like my K81's and isn't exaggerated like other mixing headphones ive tried over the years.

It would be accurate to say these would please any big fan of Electronic Dance Music such as my self but these would headphones would be better suitable to people who listen to a lot of bass-heavier genre's such as hip-hop and dubstep.

Mids:
The mids are rich but fairly balanced and detailed, a bit congested with certain genre's like Electro. The midrange makes these headphones have a warm sound that's pleasing to listen to. Male vocals sound nice but nothing will really stand out.

Highs:
The highs seem to be well balanced with the mids but sound like they start rolling off around 2-3 MHz like many other DJ oriented headphones. Vocals are clear but they sound a bit dull, don't expect to hear a large spectrum of voice detail with these headphones in comparison to semi-open or open backed headphones.

Soundstage:
As these are closed cans, the soundstage isn't the greatest especially with binaural recordings. The sound imaging is very dense, It's almost as if you were in a very large room with many doors but only one door is the exit. You're blind, nearly completely deaf, and this is a huge challenge for you to find your way out.

Conclusion:
EQ'ing these headphones can really help improve the Mids and Highs. After EQ'ing these headphones the Mids are more articulate and the Highs sounded brighter. Both male and female vocals have more presence and depth.

Overall I would give these headphones a 8.5/10, for $21.59 + shipping(Overnight is the cheapest option) you really have nothing to lose if you choose to pickup a new pair of closed back cans. These have great sound isolation, are great to wear over a long period of time without any discomfort(results may vary as I have in between small and medium ears), sound great, and have a solid build quality.

For anyone who would plan to use these for DJ'ing I wouldn't bother unless you're on a budget, they get uncomfortable to wear around the neck after a while as they rub up on the underside of your face and against your neck quite frequently specifically when you're looking down at your mixer EQ'ing a track. Pressing them against your ear for beat matching with your shoulder is comfortable and shouldn't give you any cramps or discomfort while doing so, only down side is you have to physically push the headphone a bit to position it with your ear.

Songs and mixes worth mentioning to listen to with these headphones:
Armin van Buuren - Unforgivable
Armin van Buuren - Virtual Friend (Extended Version)
Armin van Buuren - Feels So Good
Yeah Yeah Yeahs - Heads Will Roll (A-Trak Remix)
Nadia Ali - Rapture (Gareth Emery Extended Mix)
Bassnectar - The Matrix
Bassnectar - Gogol Bordello - Immigraniada
Ellie Goulding - Lights (Bassnectar Remix)
Max Enforcer & Frontliner - On The Go
Jack of Sound - A Ghost Story
Petruccio & Modulake Ft. Marie Louise - F##k It Up
Hardbass Vol 11 Cd3 Yellow (Mixed by Max Enforcer)
DJ Ravine - Supernova U18s March 12 Promo
mark5 - The Third Secret Studio Session
TrancëJay - Foreign Tunes 4
Franky2k - Disco 1
Franky2k - Resonance of Voice 14
DJ Vent - Filth That Is All
DJ Vent - Electro Mix
DJ Vent - So I Heard You Like Hardstyle

Packaging:
Well organized and detailed information on the package, the box also has a clear plastic window to preview the product inside the package so you know what you're buying.

 
Unboxing:
With the headphones you'll receive two informational papers, stickers, user manual, a small paper listing their website, Twitter, Facebook, and contact number, and last but not least; the headphones themselves.

If you want to read what's written on the papers, here's links to the pictures I took of them.
http://i939.photobucket.com/albums/ad235/EpicPie/DSC00548.jpg
http://i939.photobucket.com/albums/ad235/EpicPie/DSC00549.jpg
 
Build Quality:
The headphones feature a very simple design that makes the headphones fairly modular as the speakers come off the headband, the earpads clip onto the speaker piece(similar to some of Sennheiser products), and the cable is detachable as well. The cable uses two 1/8" plugs to plug into the right and left speaker of the headphone and a standard 3.5mm jack to plug into your DAP. The earpads and headphone pad is made out of pleather.

The headband is made from what SOL Republic calls "FlexTech" which is what makes the headband virtually indestructible(I have already bent the headband ridiculously to test this, the headband didn't even break or show any signs of stress and maintained it's shape.)

Worth noting that the build in microphone and volume control only works with certain devices that aren't i-Products. The compatibility list can be found on the SOL republic website here: http://www.solrepublic.com/culture/news/headphone-compatibility
 
Sound Quality;
Worth noting: These headphones don't have much instrumental separation.
 
Bass:
These headphones have a very accurate and boomy bass, sub-bass shines, you'll feel the vibrations on your ears from any bass heavy song or genre such as Dubstep. The bass doesn't get muddy or distorted even at higher volumes which is a plus.
 
The standard Tracks are bass oriented which is their strong point in the sound signature of the v8 sound engine that these cans have.
 
Mids:
The midrange is fairly flat and sounds congested, not a whole lot of dynamics.
 
Highs:
The highs sound rolled off and shallow. The highs are present, just not airy.
 
Soundstage:
Soundstage is some what there, the sound imaging is pretty much non-existent. Music just sounds like it's being pushing into your head, when you hear music through these headphones it doesn't sound like it's surrounding you.
 
Conclusion:
SOL Republic did a great job with designing the Tracks headphones, they're incredibly comfortable to wear over a long period of time due to the softness the earpads and headphone pad have.
 
The sound quality will appeal more to the DJ crowd as most of all DJ headphones these days seem to be very bass oriented. With the unique aesthetics of these headphones it seems to appeal more to an adult crowd that isn't as educated about high-fidelity and headphones but still want something stylish and decent sounding.
 
The Beat's line by Monster Cable has a social status effect upon the younger generation(kids, young teens, and young adults), I don't see that at all with these headphones as they aren't endorsed by celebrities. At the price of MSRP of $99.99 there are many other significantly better headphones you could pick out that would sound incredibly better compared to the Tracks headphones though I would recommend these to a bass head.
 
I believe the v10 sound engine in the Tracks HD solve the problems of the flat Mids and Highs the standard Tracks have, so the Tracks HD should be worth trying out if a retail store near you has them on their demo display. These headphones honestly don't sound as bad as the Beat's Solo's and Studio's so don't be turned away to try them.

For those of you who want to buy these, for $99.99 you can buy these at an Apple Store or Best Buy.
_________________________
Notes: SOL = Soundtrack of Life
 
I would go over the functionality of the built in volume control and the quality of the microphone but it didn't work on my Microsoft Kin.

Great headphones, after doing a few mods to them they sound incredible!
 

Edit (7/25/11): Came with a pleather carrying case which is nice. Great entry level DJ'ing headphones.

Uncomfortable to wear for a long period of time, after about an hour you'll start to feel discomfort from the pressure the headphones put on your ears. Stretching the headphones by putter them over something wide helps a lot, or just wearing them often to soften up the headband.

The hinges look cheap due to the mold marks that were on my pair, not sure if they're on every pair manufactured but makes them look cheap, the plastic is quite sturdy though.

They fold up for convenient storage and to place them into the carrying/travel case.

The wire is excessively long(in my opinion), could be a foot or two shorter. These pair of headphones would be great for a re-cable(Using a coiled cable like the one on the ATH M50's would work great for these headphones) as the drivers are very easy to access by taking off the pleather earcups which give you access to the screws.

For added comfort, you can replace the stock pleather earpads with the Sennheiser HD-25 velour earpads.

These headphones benefit a lot with a good soundcard or being amped by a desktop amp. I'm running mine through my Behringer BCD3000 midi controller as an external soundcard/headphone amplifier. Sounds phenominally

Sound Quality:
Lows:
Bass is great on these headphones, not underpowered or overwhelming, just right. Very clean sounding and great for what I primarily listen to which is usually Vocal Trance, Hands Up, Electro House, Hardstyle, UK Hardcore, Dubstep, and some other EDM genre's.

Mids:
Mids sound smooth, well extended, clean, a little bright at times.

Highs:
Highs are decent, female vocals sound smooth and pleasing.

Soundstage:
Not a whole lot compared to open cans due to them being closed back.

Overall these are fairly well rounded headphones, highs could be a little better.