AKG K 240 Studio and K 240 MKII test

AKG K 240 Studio and K 240 MKII

Studio headphone test

Semi-open studio classic with retro charm

The roots of the studio classic K 240 by AKG go back to the year 1975. The half-open studio headphone, which was available in the following decades in various variants, is even today still offered as new and enjoys high popularity and a loyal fan base.

Currently there are the AKG K 240 in the variants “Studio” and “MKII”, which differ only in design details and the accessories, so that we reviewed both models in this review summary. What exactly is behind his popularity?

Construction of the AKG K 240

The K 240 is a dynamic semi-open-ear headphones with ear-clasps around the circumference of the ear, delivering a modest 240 grams (minimal deviation between the two models) without a cable. A folding mechanism of the housing for transport purposes is not available.

Processing of the two AKG headphones

In both the studio and MKII versions, the plastic-dominated construction of the K 240 is more pragmatic and robust than putting on show effects. The nice retro charm of both models we cling here but once. Processing defects are not visible and should still be damaged, the exchange is easy by the screwing of the ironing mechanism and the easy to change ear pads.

AKG K 240 Studio golden

AKG K 240 Studio with its golden applications


The slightly cooler look of the MKII


The filigree, but sturdy brackets are made of coated metal.

AKG K 240 Studio and K 240 MKII

The two versions of the AKG K 240 in comparison


AKG K 240 mkII


Scope of delivery of AKG K 240 mkII and Studio

Both AKG models feature up-to-date interchangeable cables that attach to the left auricle with a mini XLR connector. The MKII variant offers in addition to the smooth cable (3 m) with 3.5 mm jack and screw adapter to 6.35 mm even an additional spiral cable, which can be stretched to about 5 m and the application radius in the studio in the truest sense of the word extended. Another plus of the slightly more expensive MKII model is the extra pair of velor ear cushions, which, in addition to a higher level of wearing comfort, may even offer an optional sound option.

AKG K 240 Studio and K 240 MKII

The jack for connecting the cable is located on the left auricle.

AKG K 240 Studio and mkII: Technology and Key Figures

The two relatively cheap models of the K 240 are identical in all technical details according to the data sheet and meet professional requirements in every respect, as shown by the data explicitly listed at the end of this test report (Link: Headphone specifications and their meaning). Although the 15- to 25,000-Hz transmission range does not surpass the human listening range as dramatically as is the case with many a reference headphone, information is not withheld from the user, and with a low impedance of 55 ohms, the K-240 duo plays confidently at any source. According to various sources, various revisions of the dynamic sound transducers have taken place over the years, so that a current AKG K 240 probably sounds a bit different from a K 240 from 1985. But more to the tonal attributes follows in the practical part of this review.

Purpose of AKG K 240 Studio and mkII

As a semi-open headphone with medium insulation properties, the AKG K 240 could be described as an all-rounder in the studio. But even though it is historically proven that headphones of this type are / were used for monitoring in the recording room, so I see his place but rather in the direction, where any crosstalk in the microphone can do no “damage”. A possible use is the supportive use in mixing and mastering as well as a listening tool for price-conscious “Bedroom Producer”.

Comfort of the AKG K 240

The AKG K 240 is an overall comfortable headphone due to its ingenious automatic size adjustment, its light weight and the generously dimensioned earcups. Only the non-breathable, body-uplifting materials are a bit sweaty with prolonged use or summery temperatures (like during my test), whereby the additional velor earpads of the K 240 MKII noticeably improve the comfort in this respect.

AKG K 240 Studio comfort

The low weight of the K 240 requires no thicker padding of the large headband. Too bad that the material is not breathable.

AKG K 240 Studio big ear cushions

The big ear cushions are sufficiently padded. Here the variant in artificial leather.

AKG K 240 Studio and AKG K 240 mkII: sound

The AKG K 240 were operated for this test on the following headphone outputs or amplifiers:

  • iPad 4
  • UAD Apollo 8 S
  • PL 2Control
  • Lake People G93

In addition to various acoustic experiments (sinus sweeps, usual DAW activities), I listened and analyzed a cross-style mix of own and foreign productions on the AKG K 240.

Frequency response

First, I would like to state that the use of velor ear pads surprisingly does not cause any significant change in the reproduction. This surprises me, because with other headphones known to me the change of the ear pads of (artificial) leather on velor causes sometimes dramatic changes in the frequency reproduction. This is not the case with the AKG K 240. Furthermore, the technical consistency of the two models of the K 240 causes an identical reproduction in all parameters. But what does an AKG K240 sound like? The half-open AKG classic plays good-natured overall and has a natural, plastic reproduction character without notable overdrawings of individual frequency ranges. In the lower basses as well as the upper treble, the playback is noticeably milder and may require a little more concentration and listening experience for proper assessment. The mid-frequency range is displayed naturally and quantitatively satisfactorily, so that vocal parts are well separated and not too much embedded, with the slightly raised lower mids having a slight tendency to heat. Despite the aforementioned subtle (upper!) Heights, dominant sibilants are by no means masked, so that one can easily recognize the need for further processing. so that vocal parts are well separated and not too much embedded, with the slightly raised lower mids having a slight tendency to heat. Despite the aforementioned subtle (upper!) Heights, dominant sibilants are by no means masked, so that one can easily recognize the need for further processing. so that vocal parts are well separated and not too much embedded, with the slightly raised lower mids having a slight tendency to heat. Despite the aforementioned subtle (upper!) Heights, dominant sibilants are by no means masked, so that one can easily recognize the need for further processing.

Impulse behavior

Transients are not as uncompromisingly reproduced as by much more expensive reference headphones, but nevertheless rendered useful, so that conclusions can be drawn for further measures for dynamics processing. Low-frequency impulses tend to compress in bass-emphasized styles, so the K 240 is of limited use in assessing this range.

Spatial illustration

The playback of the semi-open AKG headphones is extremely airy and transparent, individual sound sources can be located on the stereo stage properly. In unfair direct comparison to my much more expensive, open AKG K 812 cuts the K 240 not so bad, although the resolution is noticeably lower. This natural spatiality is in addition to the homogeneous frequency mapping in my view the secret of success of the AKG K 240.

AKG K 240 Studio and K 240 MKII

Justifiably still popular: AKG K 240!

Conclusion (4/5)

Although the comparatively inexpensive and transparent AKG K 240 (Studio and MKII) does not have the ultimate frequency response with the deepest subbass and unprecedentedly high-resolution highs, it’s all about honest skin. It provides a positive, average but still high-quality view of a mix, which can help assessments and interventions. This “average”, which is also represented by various studio monitors, is a not to be underestimated attribute in professional work and striking listening tools with overbought bass or other overdrawings. With its positive features, I see the AKG K 240 as a recommendable addition to monitoring monitors in the studio management.


  • natural reproduction character
  • transparent room impression
  • overall good wearing comfort
  • exchangeable cable
  • inexpensive


  • Little subbass
  • Body-worn materials a bit sweaty


AKG K 240 Studio and K 240 MKII

AKG K 240 Studio and K 240 MKII


  • Professional studio headphone
  • Half open
  • Dynamic
  • Circumaural
  • Cable management left, removable (mini-XLR)
  • 3 m straight cable
  • Stereo adapter 3.5 / 6.3 mm
  • Self-adjusting headband
  • Weight approx. 240 g (without cable)
  • Impedance 55 ohms
  • Sensitivity 104 dB SPL / V
  • Transmission range 15 – 25.000Hz
  • Nominal load capacity 200 mW
  • Additional equipment of the K 240 MKII:
  • Spiral cable, stretchable to 5 m
  • Velor ear cushions
  • Price AKG K 240 Studio: 55.50 (street price on 12.10.2018)
  • Price AKG K 240 MKII: 79, – (street price on 12.10.2018)

AKG K240 Studio Review – Professional Studio Headphone

AKG K240 Studio Headphones Video Review

AKG K240 MK II Video Review

Users Review AKG K 240 MK II Professional Semi-Open Stereo Headphones

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