This page does not review anything AKG makes. It counts one thing: how much of what this database says about their products came out of their own documents, and how much had to be worked out or left blank.
| Model | Impedance | Sensitivity | Source of the figure |
|---|---|---|---|
| K240 MKII | 55 Ω | 91.4 dB/mW | Converted from per volt |
| K240 Studio | 55 Ω | 91.4 dB/mW | Converted from per volt |
| K271 MKII | 55 Ω | 91.4 dB/mW | Converted from per volt |
| K361 | 32 Ω | 99.1 dB/mW | Converted from per volt |
| K371 | 32 Ω | 99.1 dB/mW | Converted from per volt |
| K52 | 32 Ω | 95.1 dB/mW | Converted from per volt |
| K612 Pro | 120 Ω | 91.8 dB/mW | Converted from per volt |
| K701 | 62 Ω | 92.9 dB/mW | Converted from per volt |
| K702 | 62 Ω | 92.9 dB/mW | Converted from per volt |
| K712 Pro | 62 Ω | 92.9 dB/mW | Converted from per volt |
| K7XX (Drop) | 62 Ω | 93.0 dB | Not published |
| K872 | 36 Ω | 97.6 dB/mW | Converted from per volt |
| K92 | 32 Ω | 98.1 dB/mW | Converted from per volt |
| N5005 | 18 Ω | 98.6 dB/mW | Converted from per volt |
Impedance is almost always printed. Sensitivity is the one that goes wrong, because a decibel figure means two very different things depending on whether it is per milliwatt or per volt — about five decibels apart at 300 Ω and eighteen at 16 Ω. The conversion is here.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| K240 MKII | 15 - 25000 | not printed | not printed |
| K240 Studio | 15 - 25000 | not printed | not printed |
| K271 MKII | 16 - 28000 Hz | not printed | not printed |
| K361 | 15 - 28000 Hz | not printed | not printed |
| K371 | 5 - 40000 | not printed | not printed |
| K52 | 18 - 20000 | not printed | not printed |
| K612 Pro | 12 - 39500 Hz | not printed | not printed |
| K701 | 10 - 39800 Hz | not printed | not printed |
| K702 | 10 - 39800 Hz | not printed | not printed |
| K712 Pro | 10 - 39800 | not printed | not printed |
| K872 | 5 - 54000 Hz | not printed | not printed |
| K92 | 16 - 22000 | not printed | not printed |
| N5005 | 10-40kHz | not printed | not printed |
AKG prints a frequency range for all 13 models here whose sheets have been read.
Not one of those ranges comes with a tolerance in decibels. Without a ±dB figure a range says nothing about how loud the headphone is at either end of it, which puts AKG with the majority: of the 490 models across this database whose maker prints a range, 58 print the tolerance.
The rows are not even called the same thing twice: 3 different headings across 13 models (“Audio frequency bandwidth”, “Audio frequency bandwidth (Hz)”, “Frequency response”).
1 further model of theirs in this database has no page left on their site at all, so there is nothing to read for it either way. That is counted separately from printing nothing, because it is a different fact.
No measurement is published here — only what was printed. The whole count, maker by maker, is in the frequency response audit.
The hardest of the 14 to drive is the AKG K612 Pro: 6.6 mW and 0.89 V for a 100 dB SPL peak. Their impedances run from 18 to 120 Ω, which matters because the voltage a headphone wants rises with impedance while the power falls.
277 of the 280 sources here reach 100 dB on all 14, and the cheapest of them is the Apple USB-C dongle (US) at $9. “Reaches” means the maker’s own published power figure is enough at that load; it is not a judgement of how it sounds.
On hiss the count is smaller, because most of the industry does not publish a noise figure at all: of the 83 sources here that do, 82 stay under the threshold of hearing on it. The one to watch is the AKG N5005 at 116 dB/V — the more sensitive the in-ear, the more of the amplifier’s own noise you hear.
Their lowest impedance is the AKG N5005 at 18 Ω, so a source wants an output impedance at or below 2.2 Ω to satisfy the one-eighth rule on everything they make. 134 of the 169 sources that publish an output impedance manage that.
These counts use figures the source makers published themselves. A product that publishes nothing is not counted as a pass anywhere above, which is why the three numbers differ so much. The collection matcher runs the same arithmetic over whatever you actually own.
Almost everything this site says about AKG came from them. That is not the normal case and it is worth saying out loud.
The rule used here is the same for every maker and is described on the manufacturer index. Every figure behind it can be opened on the product page it came from, with the document it came from linked.