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AKG Acoustics K701 Reference Class Headphones
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- 0 Revolutionary flat-wire voice coil technology Patented AKG Varimotion ultraprecise 2-layer diaphragm Self-adjusting cushioned genuine-leather headband Bi-wiring, high-performance cable with 1/4" jack plug Comfortable, specially shaped "3D-Form" ear pads Complete with stylish storage cradle Individually tested and numbered
- Dimension: Length: 113 mmWidth : 199 mmHeight : 212 mm
- Net Weight: 235 g
- Revolutionary flat-wire voice coil technology
- Patented Varimotion two-layer diaphragm
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This item AKG Acoustics K701 Reference Class Headphones
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|Item Dimensions||9.4 x 11.5 x 6.5 in||7.83 x 4.45 x 8.35 in||9.2 x 8.8 x 4.3 in||4.7 x 9.4 x 11.2 in||10 x 12.4 x 4.33 in||8.8 x 9.8 x 4.3 in|
|Item Weight||0.51 lb||1.8 lbs||1.46 lbs||0.62 lb||0.57 lb||1.46 lbs|
|Additional Features||lightweight||lightweight||DJ-Style||Adjustable Headband||lightweight||lightweight|
%3Cfont size%3D%222%22%3EWhether you prefer the holistic approach or like to listen analytically%2C the K 701 will turn perception into pure enjoyment%2EAKG is the first manufacturer in the world to use revolutionary flat%2Dwire technology in headphones%2C namely%2C the K 701%2E The result is a truly dramatic sound that places every musician at their correct location with pinpoint accuracy%2E This kind of agility%2C spaciousness%2C brilliant highs%2C and velvety%2C punchy bass is simply miraculous%2E These superlative open%2Dback dynamic headphones provide an outstandingly accurate sound and excellent imaging%2E Try the K 701 and find out what ingenious headphone engineering can do for you%2E%3C%2Ffont%3E
Top Customer Reviews
I narrowed my prospects to the AKG K701s, AKG K702s and AKG K712s; the Beyerdynamic DT-880 Pro Headphones (250 ohm), and the Focal Spirit Professional headphones. Of that short list, the K712s and the Focal Spirit Professional headphones cost more than I cared to spend, and the frequency response curve of and DT-880s were not as tight as the AKG K701s and K702s. Both have a flat frequency response over the majority of the musical spectrum, great reviews, and a very reasonable price for that level of audio quality.
The K701/K702 is aimed not at the iPod generation but at AKG's studio market (found on AKG's "Professional Audio Solutions" web site, "The K702's are reference, open, over-ear studio headphones for precision listening, mixing and mastering."). The K701/K702, being flat and neutral analytical reference headphones (i.e. 30Hz-10kHz +/- 3dB), only reproduce the content of the source, for better or worse. If you have the K701/702 cans powered adequately and the music source you are listening to using AKG K701/K702 cans sounds to you to be strident or muddy, or has a thin bass, or whatever, it's the musical source, not AKG K701/K702 headphones; being neutral and flat, they can only reproduce the true content of the source music. That is the purpose of studio analytic/reference grade headphones. Non-linear headphones are useless for the accurate monitoring/mixing/mastering necessary to create the highest quality artistic decisions about the musical performance.
If analytical/uncolored listening is not your goal, then these headphones aren't for you. Seek out a non-linear product that will give you a rewarding listening experience.
I chose the "Made in Austria" AKG K701 over the "Product of China" AKG K702 because through sad experience I've lost faith in the long-term reliability of anything made in China ((here's a 2012 example of the Chinese assembly quality of an AKG K242hd headphone: youtube.com/watch?v=Z_fGEK9rokw. Who knows what the interior may look like). At the time of my purchase (January 2014) I was still able to obtain the Austrian made AKG K701 headphones. In March 2014 AKG informed me that *all* AKG headphones are now being designed in Austria and assembled in China. The AKG "Professional Headphones" web page identifies only the K712 and K812 as still "Made in Austria". So it appears the AKG K701s "Made in Austria" will gradually disappear as the remaining stock gets depleted.
Using my own original studio masters (covering many genres from rock to classical) as my sound source, I found the reproduction through the K701s to be as precise as I've ever heard those recordings: extremely accurate balance across the audio spectrum, tight bass, superb imaging, neutral coloring, full natural dynamic range, no distortion. And that's straight out of the box, with no burn-in. Enjoy them right out of the box. Playing music or pink noise through them continuously for several hundred hours before using them is silly. They do not require a "substantial break-in period", and any changes that might happen over time, if any, are subtle (see my general comments below on "break-in"). That said, after about 250 hours of use, they did sound a just a tad bit smoother - most likely the result of my ears simply re-calibrating slightly from my vintage Sony MDR-V6 to the AKG K701 headphones.
While indeed very similar across the audio spectrum to the venerable and reliable Sony MDR-V6, there's a world of difference in the K701's audio performance. Although sonically almost identical in the reproduction of my masters, the MDR-V6s now feel compact, lacking the refined spatial depth and definition of the K701s. In Beethovan's Symphony No. 5 for example, it's the subtle difference between hearing the timpani rumble (the MDR-V6s) vs. hearing the individual strikes on the drum head as the timpani rumble, just as you would in the concert hall. The K701s are that good.
Physically: The leather headband is real, not imitation. They are big - almost 8 inches across and almost 8 inches tall. The cans are oversized and enclose the ear completely. Each ear piece is about 5 inches in diameter. They are comfortable to wear, but a bit snug. By design they are open to the surrounding environment and are not noise canceling. The cable is ten feet long, straight (not coiled) and terminates with a 1/4" (6.3mm) stereo phone plug. A 1/4" stereo female to 1/8" (3.5mm) stereo male plug is included. They weigh 8.3 ounces exclusive of the cable. The full audio bandwith is 10Hz to 39.8kHz. The frequency response +/- 3dB is 30Hz-10kHz. SPL is 105 dB at 1 volt into 62 Ohms. The impedance (SPL sensitivity ) of the K701/K702 headphones is rated in relation to 1 Volt, as are most studio grade cans. The impedance of most consumer grade headphones is usually rated at 1mW. For comparison of the K701/K702 to the consumer headphone reference level, the AKG K701/K702s' 105 db SPL at 1 V into 62 Ohms translates to about 93 dB SPL at 1 mW into 62 Ohms.
While my AKG K701s work with my Samsung Galaxy S4's volume set about half way, I get much better results when using the headphone circuit of my 1980s era Harman/Kardon integrated amplifier (80 Watts RMS per channel; frequency response 4Hz to 140kHz +/- 0dB). I don't think that smartphones, Ipods, MP3 players and computers can produce enough output power into a K701/K702 62ohm headphone load to drive the headphones to their full potential. The K701/K702 will benefit from suitable (not esoteric) amplification to achieve their full potential.
I would buy these AKG K701s again in a heart beat. They are a music lover's nirvana at an affordable price. If still in doubt as to the intended purpose and audio quality of the AKG K701/K702 headphones, independent reviews at audiophile sites such as KenRockwell, innerfidelity, headphone, and audiophile magazine will affirm the numerous 4 and 5 star ratings of the K701/702 found here.
A word of caution, though: If your only exposure to music has been the hypercompressed, loud, bass-heavy thumping of FM radio and such, and you like that, then you probably won't be happy at all with these exquisite headphones
Here's some general background information others have found informative.
The jury is out on this. The only formal study of which I'm aware was inconclusive and can be found on the innerfidelity web site by searching on "On the Measurement and Audibility of Headphone Break-in".I don't know of any professional audio people who give "burn-in" any credence. The subjective perception of "burn-in" is, in my opinion, the user's hearing being re-trained and adjusted to the frequency response curve of the headphone. Thus a listener coming from a headphone whose response curve boosts the lows and dips the mids (as most consumer cans do) will hear a headphone with a flat and neutral response curve (like the AKG 701/702) as having a shallow bass and a strident upper mid range. As the listener's hearing adapts over time to the uncolored accuracy of the neutral/flat headphones, the headphones miraculously "improve" after having been "burned-in", when in fact it's the listener's hearing being "burned-in" by the headphones.
Headphones with lower impedance ratings offer higher volumes at the same level of input, but they need heavier drivers to compensate for the low impedance or risk sounding muddy and distorted. The lower mass of the drivers of a higher-impedance headphone can deliver unparalleled clarity and response, but it takes more power to achieve the same loudness.
How We Hear-Consumer Headphones v. Analytical/Reference Headphones:
At low listening levels the human ear is most sensitive to the mid range (200Hz -2kHz), gradually loosing sensitivity below and above those points. If you picture the ear's frequency reception at low levels it would look roughly like a frown. At higher listening levels, the lows and highs become more pronounced less out of balance with the mid range.
The frequency response of consumer grade headphones typically looks like a smile. At higher listening levels the result is unnatural sound (lows and highs artificially boosted by the headphone's particular design). This makes most consumer grade headphones unsuitable for critical/analytical listening because the amount of boost incorporated by the individual manufacturers can be difficult to assess. Most, if not all, boost the low end significantly (+5dB or more), dip the upper mids by -5dB or more, and sometimes also boost the high frequencies. A few start rolling off the upper mids and just keep going downhill. In very broad terms, consumer grade headphones intentionally alter the audio spectrum in the low, mid, and high frequencies. Also, if headphones are underpowered, you won't hear the low and high ends accurately because of the human ear/low volume factor. Underpowered headphones don't get enough power from the source to allow the ear to hear the lows and highs at a level comparable to the midrange.
From a performer/producer/sound engineer's perspective (AKG's target market for the K701/K702), it is the non-linear consumer grade headphones that are lacking. Non-linear headphones are only used by the pros to listen to (not create) the rough mix so they can judge what the typical consumer might hear v. the artistic goal for which the musicians and producer are striving, so that they can tweak the mix without seriously compromising the artistic goal.
A sound engineer's job is to faithfully capture the sound of the music produced by the musicians. The ONLY way to do that is to monitor using amplification, speakers and/or headphones that are neutral (i.e. have a flat frequency response) over the entire audio spectrum (we'll ignore physical sound treatment of the control room for the moment). I have never met a professional who wanted to produce a mix geared to the lowest common denominator, nor geared to sound good only on the highest end audio equipment. Recording studios spend hundreds of thousands of dollars to achieve the highest degree of audio accuracy so musicians, producers, and sound engineers can make informed decisions about the mix. If the goal is a bass-heavy musical product, the flat, neutral, uncolored monitor speakers/headphones will tell the producer when the mix achieves that goal.
The working mix is also played over typical consumer equipment, in car stereo systems, MP3 devices, etc. to see if it works on what the average consumer will be using. Those with high-end and esoteric stereo systems will derive the full benefit of the musicians', producer's and sound engineer's artistic efforts. Those without will still get an enjoyable product. Studio grade analytic/reference headphones provide that flat frequency response required for artistic accuracy.
I have obsessed over audio production for years now using any equipment I could get my hands on, and after a couple weeks with these I have seen my projects go from amature to mainstream quality.
The first time I put them on they were very soft sounding, but after a half hour of letting my brain adjust I could hear every trick being used, every eq curve, every compressor and filter. They made some of the independently produced songs I used to love sound unpolished, but they made those amazing few sound so good it brought tears to my eyes.
Without a doubt, if music is important to you and you've never experienced true hi-fi, these headphones will be a life changing experience for you.
Also, I wouldn't worry too much about buying them used, they can take a beating and the noise floor actually lowers with age. Super tough cloth padding and hard leather strap, very attractive and strong enough to throw in your backpack.
The K-701's white exterior has a white iPoddish look - which some may not care for - but the construction is solid. It's distinguished by the two radial adjusting bars along the top of the phones (making for an automatic fit), and a contoured leather strip underneath. The outside of the ear cups have a wire mesh center, allowing for some free flow of sound - and creating the phones' typically bright, crystalline sound signature. The cups are lined with a comfortable velour, which can be worn easily for hours without fatigue. Indeed, there are times when you forget you're wearing headphones, though there can occassionally be pressure on the top of your head. They come with their own custom headphone stand for easy retrieval. Their straight gray cable terminates in a 1/4" jack, though a 1/8" adapter jack is included for use with portable gear.
Because of their semi-open design, they aren't your preferred design if sound leakage is an issue.
Personally, I think the 701 are an extremely attractive headphone, but ultimately it's all about sound. These headphones require an unusually long break-in period of 300 hours (or longer) to achieve their best sound. (I just tossed them in a drawer for a few days with my iTunes collection playing through them.) At first, the 701s will lack bass articulation and smoothness, and will have some sibilance; with break-in, these faults gradually vanish as the phones settle into their mature sound.
Preferences for a particular headphone sound are as individual as a pair of ears. The AKG K-701 headphones have a sound that combines characteristics of the HD-650 and DT-880. It has a preferences for the upper range, with a sweet middle and an integrated bass sound. You won't get the smoky, deep bass feel of the Beyers, nor the visceral lows of he Senns; instead, there's a feeling that bass is an natural and integral part of the recording. Still, it's fair to say that confirmed bass-heads need not apply.
The 701 exhibits a respectable soundstage, pleasing but never "in your face."
The AKG K-701 have a nice balance out of the box, but profit handsomely from a complementary headphone amplifier. Favored amps include the Woo 3 tube amp, Larocco Pocket Reference II, and Meier Aria, all of which have proven synergy with the 701. As the 701 doesn't have a powerful output without some kind of amping, it's something you'll want to think about investigating down the line. On the other hand I'm listening through the sound output of my iMac (which has iTunes as an equalizer), and the volume is perfectly satisfactory. (Headphone amps not only increase volume, but increase articulation and punch.)
If you like a clear, sparkling sound with good articulaton and a somewhat light, integrated bass, the AKG K-701 may be the headphone you're looking for. Each headphone has a serial number, and there can be a waiting list. This limited supply only adds to the 701's mystique, and it's doubtful you'll ever find them in your local stereo store.