Part III Precaution warning: M15 born for audiophiles
If you are not an audiophile, you had better not to take the M15 home. We are really serious. Just let me give you an example, even though it is not so relevant about this topic. For a Ferrari born for the race track, even if it is extremely expensive, but its high fuel consumption, hard and low underpan depend that it is not suitable for commonly using. Because Ferrari's target users are those who like to race on the track.
Similarly, the M15 is designed for those audiophiles who pursues the ultimate sound quality, because only they are willing to pay a high price to buy a product that is more expensive, heavier, and has more heat than ordinary players.
Behind the M15, there are many interesting stories.
A normal company would not like to promote and advertise blindly, calling on consumers who are not its target users to buy their own products. Because the consequences of this are that not only can you make no money, but it will also lead to many bad reviews and negative spreads to the company and products. In this way, companies may have to spend ten times or even more the cost to eliminate these negative effects.
You can take a look at Figure 2 and Figure 3 to see how high the power is of the M15. Two AK4499 DAC chips consume much more power than that of other DAC chips. Although we have made a lot of efforts in heat dissipation, it will still cause much heat than the M11 Pro.
The power consumption of 1 AK4499 ≈ 2 AK4497 ≈ 4 AK4490 ≈ 40 AK4376. This shows how high is the M15’s power consumption. (Figure 2)
The output power of the M15 at 300 ohms ≈ 3 times the same load as the M11 Pro. (Figure 3)
Below is the most complicated heat dissipation craftsmanship we adopted on the M15 among Chinese players. For the first level, we used graphene material to pass its internal heat to the aluminum frame. (Figure 4)
For the second level, the heat of the AK4499 chip is transferred through thermal conductive silicone to the copper shield with good thermal conductivity. (Figure 5)
With great efforts of engineers, the M15’s heat dissipation capacity has been significantly improved. (Figure 6)
It is reasonable for consumers to expect that manufacturers can do better in power consumption and heat dissipation. Therefore, in the part that does not affect the sound quality, we chose the Exynos7872 SoC which has low power consumption yet strong performance. It is the most excellent chip far ahead than that among all Chinese players currently.
Moreover, it should also be noted that the comparison between heat generation and power consumption must be under the same premise. In other words, only if two players have similar output power and configuration can the power consumption comparison be meaningful.
On the contrary, if we compare the M7 with low output power and a very power-saving DAC chip with the M15 in terms of the battery life and heat generation, it is definitely the M7 will gain the upper hand.
Furthermore, the M15 is indeed the hottest one in FiiO's player product line. When compared with similar products of other brands, the M15 is still better at power consumption and heat generation control.
Lastly, I would like to remind you that any object that can generate heat, even if the heat generation value is small, would rise in temperature if being put in a well-sealed environment. Therefore, when you use electronic products, especially HIFI players with obvious heat generation, you must be careful not to use them in the bed or an inclosed leather bag for a long time.