Comparison Dali Katch G2 vs Dali Katch

— Bluetooth. Wireless technology for transmitting sound from mobile phones, tablets, etc. Allows connecting a device wirelessly at a short distance from the signal source. The quality and overall capabilities of Bluetooth depend on the version:

Bluetooth 4. Each version brings improvements over the previous one. For instance, version 4.0 integrated three standards: traditional Bluetooth, high-speed channel, and a power-saving mode for small data volumes. This optimized channel usage and battery consumption. In version 4.1, interference resistance was enhanced near 4G LTE modules. Version 4.2 mainly offered overall improvements in speed and security.

Bluetooth 5.0. One of the most significant innovations of the Bluetooth 5.0 standard was the expansion of the BLE ("Bluetooth Low Energy") mode capabilities: when necessary, the device can increase range by reducing speed, or speed up transmission by reducing range. Additionally, several enhancements were made for simultaneous operation with multiple connected devices.

— Bluetooth 5.1. A substantial upgrade in version 5.1 was the ability for precise positioning of the signal transmitter (receiver). While previous versions could only determine distance, version 5.1 can also determine direction. This improved navigation functionality, enhancing smart home systems, locatin...g connected devices, etc. Additionally, improvements again addressed power-saving and simultaneous operation with multiple connected devices.

— Bluetooth 5.2. The next update after 5.1 in the Bluetooth 5 generation. The main innovations in this version were a range of security enhancements, additional power consumption optimization in LE mode, and a new audio signal format for synchronizing parallel playback on multiple devices.

— Bluetooth 5.3. The Bluetooth v 5.3 wireless communication protocol was introduced at the beginning of 2022. Innovations speeded up the channel agreement process between the controller and the device, implemented fast switching between low duty cycle and high-speed mode, improved bandwidth and connection stability by reducing susceptibility to interference. In case of unexpected interference in Low Energy mode, the channel selection procedure for switching is now faster. The 5.3 protocol does not present fundamental innovations, but several qualitative improvements are evident.

— Bluetooth 5.4. Introduced in early 2023, the version increased the range and data exchange speed. Also, Bluetooth v 5.4 enhanced the BLE power-saving mode. This protocol uses new security features to protect data from unauthorized access, has increased connection reliability by selecting the best channel for communication, and prevents connection losses due to interference.

— Mini-Jack (3.5 mm). Standard Aux audio input for connecting speakers to an audio signal source — for example, a laptop or smartphone.

— USB. Presence of a USB port allows connecting USB flash drives, mobile phones, MP3 players, and other similar peripherals to portable speakers. Therefore, such models have a built-in player and enable using connected gadgets solely as storage devices.

— Card reader. Like the above-described USB, this feature implies the presence of a built-in player in the speaker system. A card reader allows using memory cards as storage where songs can be recorded.

— FM receiver. An integrated tuner, allowing the speaker system to function as a full-fledged FM radio receiver — this range is popular among music radio stations (particularly due to the ability to broadcast sound in stereo format).

The ratio of the level of the useful signal (the actual sound being reproduced) to the level of extraneous noise provided by the speaker amplifier in normal mode.

Any amplifier inevitably creates its own noise; You cannot get rid of them, but you can reduce their level. The higher the signal-to-noise ratio, the cleaner the sound will be, the less noticeable extraneous interference will be. However, it is worth keeping in mind that the signal-to-noise ratio is far from the only parameter that affects sound quality, and its high value does not guarantee pleasant sound from the speakers.

The SPL (Sound Pressure Level) parameter determines the sound volume of portable acoustics. This indicator is expressed in decibels (dB). The higher the SPL, the louder and farther the sound produced by the speaker travels. It is important to consider that decibel is a non-linear quantity. In other words, increasing the volume from 20 dB to 40 dB or from 40 to 80 dB does not mean increasing it by 2 times. Therefore, when making an assessment, it is most convenient to refer to comparative tables of noise levels in special sources.

The presence of a passive radiator in the design of the speaker system.

Such an emitter is a speaker cone that does not have its own coil and magnet — in other words, it does not produce sound itself, but only vibrates from the sound of other speakers. Like the phase inverter (see above), this part is intended to improve sound pressure and sound depth, especially at low frequencies; at the same time, the advantage of a passive radiator is the absence of a tube, due to which the design is simpler and more compact than with a phase inverter.

The range of audio frequencies reproduced by the audio system. The wider the range, the richer the sound, the more details the speakers can convey, especially in the low and high frequencies. At the same time, we note that the average human ear is able to hear sounds in the range of about 16 – 20,000 Hz, and it makes no sense to provide a wider range in speakers — a person simply will not hear it. Also note that a wide frequency range alone does not guarantee good sound quality.

Initially, sound transmission via Bluetooth involves quite strong signal compression, which can greatly spoil the experience when listening to music. To eliminate this drawback, various technologies are used (the most popular of which is the aptX codec). Of course, to use any of the technologies, it must be supported not only by the sound system, but also by the Bluetooth device with which it is used.

- aptX. A Bluetooth codec designed to significantly improve the quality of audio transmitted over Bluetooth. According to the creators, it allows you to achieve quality comparable to Audio CD (16-bit/44.1kHz). The benefits of aptX are most noticeable when listening to high-quality content, but even on regular MP3 it can provide a noticeable sound improvement.

- aptX HD. This codec is a further development and improvement of the original aptX technology, allowing you to transmit sound in even higher quality - Hi-Res (24-bit/48kHz). According to the creators, this standard allows you to achieve signal quality superior to AudioCD and sound purity comparable to wired communication. The latter is often questionable, but it can be argued that overall aptX HD provides very high sound quality. On the other hand, all the advantages of this technology become noticeable only on Hi-Res audio - with quality 24-bit/48kHz or higher; otherwise, the quality is limited not so much by the characteristics of the connection as by the propertie...s of the source files.

- aptX Low Latency. A specific version of aptX described above, designed not so much to improve sound quality, but to reduce delays in signal transmission. Such delays inevitably occur when working via Bluetooth; They are not critical for listening to music, but when watching videos or playing games, there may be a noticeable desynchronization between the image and sound. The aptX LL codec eliminates this phenomenon, reducing latency to 32 ms - such a difference is imperceptible to human perception (although for serious tasks like studio audio work it is still too high).

- A.A.C. A codec used primarily in Apple portable devices to improve sound transmitted via Bluetooth. In this sense, it is similar to aptX (see the corresponding paragraphs), but is noticeably inferior to it in terms of capabilities: if the sound of aptX is compared with Audio CD, then AAC is at the level of an average quality MP3 file. However, for listening to the same MP3s, this is quite enough; the difference becomes noticeable only on more advanced formats.

-LDAC. Sony's proprietary Bluetooth codec. It surpasses even aptX HD in terms of bandwidth and potential sound quality, providing performance at the Hi-Res level of 24-bit/96kHz audio; there is even an opinion that this is the maximum quality that it makes sense to provide in wireless headphones - further improvement will be simply imperceptible to the human ear.

Theoretically, a higher capacity allows to achieve greater battery life, but in fact, the operating time also depends on the power consumption of acoustics — and it can be very different, depending on the characteristics and design features. So this parameter is secondary, and when choosing it is worth paying attention not so much to the battery capacity, but to the directly claimed operating time (see below).

Operating time of a portable audio system without connecting to an external power source (network or USB port, depending on the capabilities). Note that manufacturers tend to indicate battery life in their specifications under optimal conditions for energy saving: at low volume, without using additional functions, etc. Therefore, in fact, this indicator may be noticeably lower than the claimed one, and speakers with a long operating time will not sound at full volume for the specified hours.

The time it takes to charge a fully discharged device to 100% charge.