Comparison Astell&Kern A&ultima SP1000M vs Astell&Kern A&ultima SP1000

The amount of built-in memory installed in the player.

This parameter directly determines how much music and other content can be stored in the device without resorting to memory cards (especially since some models do not support such cards at all). For comparison: the size of one MP3 file usually does not exceed 20 MB, the same composition in lossless format has 3-4 times more volume, a film in standard quality takes on average from 700 MB to 2.5 GB, in HD 720p — up to 5 – 6 GB. Thus, in terms of data storage, the more internal memory, the better. On the other hand, the price of the player directly depends on the storage capacity. Thus, some models are available in several modifications, differing in the amount of memory and price.

When choosing, note that part of the memory will inevitably be occupied by software firmware and pre-installed applications; sometimes this part turns out to be quite significant — for example, in models with an OS on board (see above), several gigabytes can be occupied. Also note that memory cards in terms of gigabytes of volume are cheaper than built-in drives, and from the practical point of view, in most cases they are not inferior to them. So it makes sense to specifically look for a player with a large amount of internal memory, first of all, if this model does not work with memory cards.

Now there are players on the market with such a memory capacity: up to 8 GB, 16 GB, 32 GB, 64 GB and more. However, there are also models without built-in memory, designed for use only with memory cards.

The maximum size of the memory card that can be used in the player. This parameter is directly related to the card type (see above): each type has its own volume limits. At the same time, the ability to work with capacious media is limited not only by the type of card, but also by the player's hardware. Therefore, many models have a lower capacity limit than the memory card suggests — for example, 128 GB in a model that supports the SDXC format (the theoretical maximum for which is 2 TB).

Note that the reverse situation also occurs — for example, when a device with a maximum capacity of 16 GB only supports microSD cards (theoretical maximum is 4 GB). This usually means that the player can work with newer formats (in our example, at least microSDHC), but for some reason this point is not mentioned in the official specifications (for example, the manufacturer could make a mistake in the documentation).

The ratio between the level of the useful signal (clear sound) and extraneous noise, given by the player at the output. This parameter directly characterizes the quality of the built-in amplifier: it mainly takes into account the intrinsic noise of electronic circuits, and the higher the signal-to-noise ratio, the less these noises and the clearer the sound.

Note that in the case of players, this characteristic is often not particularly critical: the noise of the amplifier can be lost against the background of ambient sounds, especially in an urban environment, and for such situations even the most modest indicators, at the level of 70 – 80 dB, are enough. At the same time, for Hi-Fi models (see "Type") this moment is one of the most important; in the most advanced devices, the signal-to-noise ratio can exceed 120 dB.

The coefficient of harmonic distortion produced by the player.

This parameter directly characterizes the amount of distortion introduced by the device into the original sound: the lower the coefficient, the clearer the sound, the less such distortion. It is impossible to completely eliminate them, but they can be reduced to a level that is practically not perceived by a person. So, it is believed that distortions at the level of 0.5% are already invisible even to an experienced listener. At the same time, in modern audio technology, there are also much lower values \u200b\u200b- up to ten thousandths of a percent. In the case of players, such indicators play mainly an advertising role — they are a sign of a high level of the device.

Note that the coefficient of harmonic distortion is indicated mainly for Hi-Fi players (see "Type"), for which the maximum purity of sound is critical; in conventional models, it is of secondary importance.

The player supports Bluetooth technology.

This technology was developed for direct wireless communication between various devices. The ways in which it can be used can vary; in the case of players, the most common option, which is almost mandatory for any model with Bluetooth, is to broadcast sound to wireless headphones, speakers or other similar devices (aptX is highly desirable, see “Functions/capabilities”). In addition, other methods of using Bluetooth may be envisaged - in particular, exchanging files with other devices and remote control (player or from the player); the specific set of additional functions should be specified separately. And Bluetooth versions (the latest of which at the end of summer 2021 is Bluetooth 5.0) indicate the advancedness of the device and its increased capabilities.

The capacity of the battery installed in the player.

Theoretically, a larger battery can provide longer battery life. However, in fact, battery life will depend not only on the capacity of the battery, but also on the power consumption of the player, and it is directly related to the functionality. Therefore, when evaluating battery life, it is better to focus not on battery characteristics, but on the operating time directly stated in the characteristics (see below). And only models with similar characteristics can be compared with each other in terms of battery capacity — for example, media players on Android with approximately the same screen sizes.

The maximum time the player can operate on one battery charge in audio playback mode. You should pay attention to this parameter first of all if you have to use the device for a long time without the ability to recharge the battery. At the same time, note that manufacturers usually indicate an “perfect” operating time: at a constant relatively low volume, without working with the screen and other additional functions that also consume battery. And this means that in fact the battery life of the player may be somewhat lower than stated. Nevertheless, this parameter allows you to fairly accurately assess the suitability of the player for long-term work without recharging, and is also quite suitable for comparing different models with each other.

The time required to fully charge the battery in properly powered players.

In this case, we mean the battery charging time from 0 to 100% when using a standard charger (or a third-party charger with identical characteristics). Accordingly, in practice, this indicator may differ from the declared one, depending on the specifics of the situation. However, in general, it is quite possible to evaluate different models and compare them with each other.

Also note that an increase in battery capacity inevitably implies an increase in charging time. To compensate for this moment, special fast charging technologies can be used - however, they affect the cost and require the use of specialized memory.

The type of connector used to charge the player’s built-in battery, or more precisely, to connect an external charger. The role of such a device can be played by a network or car adapter, a power bank, or even a USB port of a PC or laptop. As for specific connectors, the most common options are:

- microUSB. A smaller version of the USB connector designed for portable devices. It appeared quite a long time ago, but does not lose popularity in our time and is used by many manufacturers.

- MiniUSB. Similar to the connector described above, which differs only in the size and shape of the socket - for this interface they are slightly larger than for microUSB. Because of this, the connector is less common.

- USB C. A miniature USB connector, positioned, among other things, as a potential successor to microUSB. Unlike its predecessor, it has a double-sided design, thanks to which the plug can be inserted into the socket on either side.

— Lightning. Apple branded connector. Like USB C, it has a reversible design, while being somewhat more convenient and reliable, but the use of Lightning is limited to products from Apple itself.

- Branded. A connection connector that does not belong to generally accepted standards and is used to a limited extent - in equipment from one or several manufacturers. However, due to general standardization, this option has practical...ly disappeared from the scene.