ZK-APTX1 2.1 Channel Bluetooth Amplifier Board 100Wx2+200W Subwoofer Theater HiFi Stereo Equalizer Power Amplifier Board
Direct purchase from the factory 
Zagarantovana sigurna naplata
Besplatan dar
Pravila dostave
Pravila povrataBesplatan dar
Dobrodošli u Roymall, vašu profesionalnu web stranicu za kupovinu vrhunskih darova iz robnih kuća. Visoko cijenimo i cijenimo vašu podršku i želimo vam zahvaliti dodajući dodatnu dozu uzbuđenja vašim kupovinama. Kada kupujete kod nas, ne samo da ćete uživati u visokokvalitetnim proizvodima koji poboljšavaju vaš životni stil, već ćete također dobiti ekskluzivni besplatni dar uz svaku narudžbu koju izvršite. Spremni istražiti našu kolekciju i pronaći savršene darove? Pregledajte naš izbor vrhunskih artikala iz robnih kuća, izvršite narudžbu i radujte se uzbuđenju kada vaš besplatni dar stigne zajedno s vašom kupovinom.Pravila dostave
Trudit ćemo se dostaviti artikle nakon što primimo vaše narudžbe i osigurati da stignu sigurno. Detalji o dostavi bit će navedeni u vašoj potvrdnoj e-pošti.U većini slučajeva narudžbe se obrađuju u roku od 2 dana.U posebnim okolnostima, bit će odgođeno kako slijedi: Kada naručite subotom, nedjeljom ili praznicima, bit će odgođeno za 2 dana..Obično je potrebno 5-7 radnih dana (od ponedjeljka do petka) bez utjecaja kašnjenja leta ili drugih okolišnih čimbenika..Budući da je naša usluga dostave širom svijeta, vrijeme dostave ovisit će o vašoj lokaciji, pa možda trebate malo pričekati ako se nalazite u udaljenim područjima ili zemljama.1. Pravila povrata i zamjene
Prihvaćamo samo artikle kupljene s roymall.com. Ako kupujete od naših lokalnih distributera ili drugih trgovaca, ne možete ih vratiti na našoj strani. Artikli na kraju prodaje ili besplatni darovi nisu prihvatljivi za povrat.Da biste ispunili uvjete za povrat, vaš artikl mora biti neiskorišten i u istom stanju u kojem ste ga primili. Također mora biti u originalnom pakiranju.Nakon što od nas primite upute za povrat, pakirajte svoje vraćene artikle i ostavite paket u lokalnoj pošti ili drugom kuriru.Obradit ćemo vaš povrat ili zamjenu artikla unutar 3-5 radnih dana nakon što ga primimo. Povrat novca bit će obrađen i automatski vraćen na vaš izvorni način plaćanja.Ne mogu se prihvatiti povrati ili zamjene ako je proizvod prilagođen, uključujući prilagođenu veličinu, boju ili ispis.Treba li vam dodatna pomoć, kontaktirajte nas. service@roymall.com ili Whatsapp: +8619359849471
2.Pravila povrata novca
Dobit ćete potpuni povrat novca ili 100% kredita u trgovini nakon što primimo vraćeni paket i provjerimo ga. Povrat novca bit će obrađen i automatski vraćen na vaš izvorni način plaćanja.Imajte na umu da troškovi dostave i bilo kakve carine ili naknade nisu povratni. Dodatni troškovi dostave ne podliježu povratu nakon što je paket poslan. Odgovorni ste za plaćanje tih naknada i ne možemo ih odbiti ili vratiti, čak i ako se narudžba vrati nama. Nakon što primimo i potvrdimo vaš vraćeni artikl, poslat ćemo vam e-poštu kako bismo vas obavijestili da smo primili vaš vraćeni artikl. Također ćemo vas obavijestiti o odobrenju ili odbijanju vašeg povrata novca.Ako imate bilo kakvih problema u vezi s procesom povrata novca, kontaktirajte nas. service@roymall.com ili Whatsapp: +8619359849471Question and answer:What kind of speaker does it come with? How much power is used? Recommend an amplifier?In fact, this is the same question because the three of them are related. I believe that after learning the following knowledge, no matter what kind of amplifier you make, you will calculate the compatibility relationship between the power supply, speaker, and amplifier yourself.1. According to Ohm"s law, power P=U * U/R, the higher the voltage, the smaller the horn resistance and the greater the power; So the final output power is not only related to the power amplifier, but also to the power supply voltage and the resistance of the speaker. According to the formula, if the power supply is 24V and the horn resistance is 4 ohms, then the peak power=24V * 24V/4 u03a9=144W, and the effective value (rated power) of a 1 kHz sine wave=24V * 0.707 * 24V * 0.707/4 u03a9=72W; The peak power of an 8-ohm horn is 24V * 24V/8 u03a9=72W, and the rated power is 24V * 0.707 * 24V * 0.707/8 u03a9=36W, If the power supply is 12V and the 8 ohm horn is used, the peak power is 12V * 12V/8 u03a9=18W, and the rated power is 12 * 0.707 * 12 * 0.707/8 u03a9=9W. Our amplifier"s nominal power is the rated power, and later on, it defaults to the rated power.2. In order to leave sufficient power margin and avoid clipping distortion, it is better to have an amplifier power of 1.5-2.5 times the speaker power. For example, if your single channel speaker is 100W, the corresponding amplifier board"s single channel output power should be between 150W and 250W. Speakers can be connected in parallel or series. Two 8-ohm and 50W speakers connected in parallel are equivalent to a 100W4 ohm speaker. It is recommended to choose an amplifier with a typical load impedance value that is the same as the final impedance value of your speaker system. This amplifier generally support 4-8 ohm speakers, while a few high-power amplifiers support 2-8 ohm speakers. If the speaker resistance is too small, the amplifier chip is prone to overcurrent power protection or burning.
3. The choice of power supply is also very important. Some one use a 5V2A mobile phone charger or a 12V1A2A adapter to drive a 50W100W amplifier, but the voltage and power are obviously not enough. Ultimately, the voltage is pulled down, and the sound becomes distorted and distorted when slightly louder, resulting in a cloudy sound or intermittent protection from the power supply causing sound lag. It doesn"t matter if the power supply is too high, but if the power supply is not sufficient, the problem mentioned above will occur. So what size of power should be chosen? This issue involves two parameters: voltage and current. In theory, the power supply should be greater than the total power of the power amplifier. For example, if TB21 is a 50W+50W+100W power amplifier, you should choose a 24V8A or higher power supply. But there is also a situation where the speaker you choose is not that large. In order to facilitate power adaptation or reduce power costs, you can calculate the actual power required. For example, the subwoofer speaker you choose is 4 ohms 50W, and two stereo speakers are 8 ohms 30W. If you choose a 12V power supply, the maximum output rated power of the subwoofer is P=12 * 0.707 * 12 * 0.707/4 u03a9=18W. Obviously, a 12V voltage cannot meet this requirement. Try a 24V power supply again. The subwoofer output P=72W, the stereo output P=36W+36W, and the total power is 144W. Therefore, a 24V6A power supply is sufficient. Some one say that I have a 24V20A power supply with a power of 480W, but it"s better to have an 8-ohm 100W speaker. According to Ohm"s law, a maximum power output of 36W can be achieved with a 24V and 8-ohm power supply. Obviously, the speaker cannot be pushed. Although the speaker has sound, it is not full enough. According to the formula, the voltage needs to reach 40V or above. Another thing to note is that the power supply of adapters on the market is falsely labeled, and 24V8A10A adapters may be protected for less than 6A.
4. Many customers have a misunderstanding: the higher the power of the amplifier board, the louder the speaker must be. The answer is uncertain!Real case 3002T (300W+300W) power amplifier. I suspect that this amplifier has a serious false label. The sound is not as loud as other 30W amplifiers, and it is not 300W at all. In comparison, the normal power amplifier gain is 36dB, the speaker is 8 ohms 30W, and the power supply is 24V. According to the formula, the maximum mono output power is 36W; when using the 3002T, the power supply is also 24V, and the speaker is 8 ohms, 150W. However, according to the formula calculation, the maximum output is also 36W, and the gain of 3002T itself is 32dB. The original volume of the small power amplifier was adjusted to 70%, achieving 100% of the volume of the large power amplifier. The problem is clearly not a miscalibration of the amplifier; In this case, a 48V6A or higher power supply should be selected to make full use of its power. Obviously, a 30W small power amplifier cannot support 48V power supply and 300W output.
