Have a Shure 55? You need this.
921014
Perfect length for my needs. Very rigid, even with a heavy mic attached. This works beautifully with an On Stage QK2C Quick Release--exactly the right setup for my Shure 55 Super.
2677918
This product is made for the audiophile that wants to squeeze every bit of sonic quality out of their music that they possibly can get.

I had been using the outstanding Denon AH-D600 headphones for the past year after rocking Sennheiser headphones for the past decade+ and was amazed at how much BETTER my listening experience could get, going from a Mercedes to Rolls Royce for my ears.

With the SONY PHA-2 that Rolls just got a new set of tires.

This device isn't made for everyone and if you already have a great pair of headphones you might not get the sonicgasm you expect but there is no doubt that this amplifier will take an A grade and turn it into an A+.  Bass is easily more apparent, there is more depth to the music I listen to (and my main genre is soundtrack/classical so this is a great test case) and I can't see myself NOT using this device from now on in the office.

The main con of the PHA-2 is that you can't charge it while in usage (this makes no sense to me whatsoever) and my iPhone 5 won't charge while connected.

I really, really, REALLY like the fact that SONY is going back to their roots and has made a device that is innovative and DIFFERENT from what you normally see on the shelves of your local big box retailer.  I'm surprised the device ever got green-lit in the first place as it's very expensive and you are talking about a very select set of listeners that are going to pick this up.

***** HIGHLY RECOMMENDED
2363282
I run all of my TV and music through a barebones Sherwood stereo receiver. It does a decent enough job on the TV sound, but running vinyl sound directly into the phono input is damn near unlistenable.

Enter the Behringer. It's a night and day difference. Not the prettiest nor the sleekest looking device, and it might not pass the test of an audiophiles ear, but it does it's job very well. It majorly beefed up the sound coming through my rather lackluster stereo receiver. Incredibly happy with the purchase and the value of the product.
2302859
These things are freaking awesome! I'm a musician and a sound tech so I'm a stickler for good quality sound. The only perceivable differences because this mic and a ShureSM58 is the proximity effect is very apparent on this mic (just stand closer to the mic) and the Shure has more body (eq's will fix that). I routinely fool other sound guys because they, even after holding it, think it's a 58. The sturdiness is impeccable, the look is spot on and the price is PHENOMAL!
537197
I have a couple of these OSP DL-320s AND I have a Shure SM-58 as well. I'm not an 'audiophile' type, but I can't hear any difference between the Shure and the OSP. They are virtually identical in every way (though I should mention the parts are not interchangable).

I have a home rehearsal studio and I'm on a pretty tight budget so I bought a couple of the OSP DL-320 mics for the same price as a single Shure SM-58. I'm 100% satisfied with them. They're durable, sound great and even look like the Shure. I also bought a couple OSP DL-330 mics (Shure SM-57 clones) and I'm just as happy with those too.
3084073
I installed this to my Taylor 110, after tucking the mic for a more discreet look, and have been highly impressed in several different settings, from studio to stage, with the kind of tonal transparency that outperforms Taylor's Expression System.

In-studio, the blending of the mic with a hint of undersaddle has allowed for a more subtle bite than simply using my Behringer condenser, not to mention the fact that I'm no longer held hostage by a stationary mic for recording.  I can plug in, make myself comfortable, and play as free as a bird.

Onstage, the clarity is just as noticeable, with a fuller sound than most AE setups I have used.  This works well for recording live shows, as the line between studio and stage becomes nonexistent.

For my aims of natural music in a synthetic age, this has been a worthwhile investment.
876896
This is EXACTLY what I needed!

I run the audio from my cable box into the Line In input of my computer's audio card.  That way, I can use my Turtle Beach Stealth 450 headset to listen to my TV without disturbing my neighbors.

Unfortunately, there was a terrible buzz due to a ground loop.  It took me a while to identify it, though.  Thus began my search for an inexpensive filter.  I actually bought two filters, the other intended for the cable input.  It turns out I didn't need that one, since this one completely eliminated the buzz.

If you're looking for something cheap but effective, this is what you need.
372181
The Fiio E6 Headphone Amp allows for a drastic improvement in sound quality through your headphones. You might think your laptop or ipod give you satisfactory results, but most of the time, they don't. Especially if you have rather expensive headphones (I have the Audio-technica M50's) your Ipod/phone/computer will be unable to properly power them. This Amp allows for higher volumes, an incredible bass boost, and a great 'rock' EQ setting that brings the trebles and bass out more clearly. Highly recommend for any sort of sound enthusiast or merely for someone who wants to hear their music better.
3298639
i can't believe any of my pyle products work, since they are outrageously cheap. but i have this hooked up to the logitech bluetooth adapter for my home stereo and it not only cut out the hum issue i was having, but is producing a much louder signal overall with clearer low end.
435484
If you're like me and really can't sing, it doesn't matter what mic you have and I wasn't going to spend the money on a Shure SM58 when I can buy 4 of these for the same price.  I've used this mic with a Behringer Xenyx 802 and currently with a Yamaha MG06X and it sounds good to me and everyone else that was using it.
2597730
Had I known this little gizmo was even an option, I would've forgone the agony of trying to continuously prop up my speaker jack in some sort of contorted configuration only happened upon by blind luck.  To think of how many months I wasted continually fiddling with the little bastage.

You plug your new external adapter into a USB port, plug your speaker jack into the the slot and after selecting it as your  default sound adapter (I have Windows), oila!  Beautiful sound, baby!

Can't beat the price and ease if you're like me and your laptop input jack goes awol.
4435931
Does exactly what I need it to - the included adapter fit my Shure mic clip perfectly.  I am very happy with this purchase!
3313496
I received a 'refurbished' Shure SRH440 a few days ago.  It was just like new but the seal on the box had been opened.  At first, I liked it, but didn't love it.

But as others have mentioned, the ear pads aren't great.  Shure should bite the bullet and just build the 440s with the 840s ear pads!  I haven't ordered the Shure 840 ear pads as many have recommended (why should the user have to spend another $15 to make the product comfortable???)...instead I did the 'sock mod'...I am just NOT a fan of 'pleather'.

Swiped a black pair of socks (not too thin and not too thick, but soft) from the hubby's sock drawer and cut the top 3.75" off of each one.  Put the top (finished) end of the sock around the outside of ear cup and tucked the 'cut' end into the recess inside the ear pad.  However, it won't stay tucked without help.  I cut two 9" segments (one for each ear pad) from a TV cable (coax) and curled them into tight circles and tucked them into the recess inside the ear pad, to hold the cut end of the socks in place.  Ahhh...much better now.

Some people have said they don't feel the 440 has enough bass, but it is perfect for me...I do not like deep, heavy, booming bass.  The sound is crisp, clear, clean.  Very good isolation...outside sounds stay outside...inside sounds stay inside...just as you would expect from a circumaural, closed-back headphone.

I have seen several 440s (as well as 840s) on Ebay broken at the hinges.  The 440 is plastic, so I would recommend putting it on, taking it off, and adjusting it using equal pressure with both hands and being gentle when folding up.

While reading reviews, do note that everyone has different shaped/size heads and ears, and different hearing acuity.  I guess that is why reviews for the same model of headphones often range from 1-5 stars!

I am giving these 4 stars due to the ear pads and potential for breakage at the hinges.  I also wish that there were more cable choices instead of long coiled or long straight.  I would much prefer a 3-4 foot straight, but since there is a special connector at the end that attaches to the headphone, I haven't found any alternatives.  Some enterprising person should make different lengths and sell them on Ebay!

I think the sound is GREAT and highly recommend the 440s in the under $100 headphone class....but I am NO EXPERT!

However, check out the "NVX Audio XPT100 Studio Over-Ear Headphones w/ ComfortMax Earpad Cushions and Extra Pair of Angled Earpads", as well as a short and long cord, and padded storage container...on Amazon, which I rated 5 stars.

UPDATE 10/12/14 - In order to make the 440 more comfortable/useable:

Go to a fabric store and get a piece of 'minky' material to wrap around the headband for cushioning:

https://www.google.com/search?q=minky&client=firefox-a&hs=ROd&rls=org.mozilla:en-US:official&channel=sb&tbm=isch&tbo=u&source=univ&sa=X&ei=t_I3VP6JKIu_sQTM9oDoDA&ved=0CGoQsAQ&biw=1280&bih=807

Get Brainwavz HM5 earpads from mp4nation.net (you will need to order two).
Pleather
http://www.mp4nation.net/brainwavz-hm5-spare-earpad-1pc
or
Velour
http://www.mp4nation.net/brainwavz-hm5-velor-memory-foam-earpad-suitable-for-other-large-over-the-ear-headphones-1pc?utm_campaign=website&utm_source=sendgrid.com&utm_medium=email

I also got a short/straight cord via Ebay from China.

I STILL recommend the NVX Audio XPT100 over the Shure 440 because they have everything you need already in the package...for under $100....5-STAR...super comfortable.

Another contender is the California Silverado for $49...build quality is truly exceptional.

http://www.amazon.com/California-Headphone-Co-Headphones-Detachable/dp/B009F4BV8C/ref=sr_1_1?ie=UTF8&qid=1412961813&sr=8-1&keywords=california+silverado
3279356
this is one of the best investment i've made for the sony a55 other than a prime lens.  the built in microphone distorts bass terribly, but with this microphone i'm able to record music/concerts with no distortion.
562342
Bought this for my Sennheiser HD 558 Headphones so that I can just use any standard Aux cable (3.5mm to 3.5mm) with them instead of the awkward original 10 foot long 2.5mm to 6.3mm cable. This adapter fits perfectly into the port where the original 2.5mm cable went in, however you do have to be willing to take 5 minutes with a small screwdriver and take the left side of the 558 apart to remove the small plastic piece with the nubs that locks in the original cable, since those nubs will block this adapter from being pushed all the way in. If you feel comfortable doing that, then this adapter is a great way to make the Sennheiser 558's much more practical.
4855782
Perfect budget option for a little hi-fidelity input for your computer. No it doesn't work wonders, no it's not studio 192,000 rate recording hardware, but it's worlds better than that webcam microphone you've been using, and if you pretty much only VOIP call now, this gets rid of the annoying webcam limitations and echo cancellation failures and so forth. Everyone commented on how much better my VOIP started sounding immediately.
514968
My advice.  Buy 2 of these great cables and a 2nd sub-woofer.  Place them far left and right in your listening field and you're in 'audio heaven'.