ZK-APTX1 2.1 Channel Bluetooth Amplifier Board 100Wx2+200W Subwoofer Theater HiFi Stereo Equalizer Power Amplifier Board
Direct purchase from the factory 
Seiceáil Slán Ráthaithe
Bronntanas Saor in Aisce
Polasaí Loingseoireachta
Polasaí FillteBronntanas Saor in Aisce
Fáilte go Roymall, do shuíomh gréasáin gairmiúil chun bronntanais ollmhargaidh préimhe a cheannach. Táimid thar a bheith buíoch as do thacaíocht, agus ba mhaith linn ár mbuíochas a chur in iúl trí bhlas breise spraoi a chur le do cheannacháin. Nuair a cheannaíonn tú linn, ní hamháin go mbaineann tú taitneamh as táirgí ar ardchaighdeán a fheabhsaíonn do stíl mhaireachtála, ach gheobhaidh tú bronntanas saor in aisce eisiach le gach ordú a chuirfidh tú. Réidh chun iniúchadh a dhéanamh ar ár mbailiúchán agus na bronntanais foirfe a aimsiú? Déan iniúchadh ar ár rogha earraí ollmhargaidh préimhe, cuir d'ordú, agus bí ag súil le spraoi do bhronntanais saor in aisce ag teacht in éineacht le do cheannach.Polasaí Loingseoireachta
Oibreoimid go dian chun earraí a sheachadadh chugat tar éis d'orduithe a fháil agus a chinntiú go sroicheann siad slán sábháilte. Soláthrófar sonraí seachadta i do ríomhphost deimhnithe.I bhformhór na gcásanna, déantar orduithe a phróiseáil laistigh de 2 lá. Faoi imthosca speisialta, déanfar moill air mar seo a leanas: Nuair a chuireann tú ordú Dé Sathairn, Dé Domhnaigh nó laethanta saoire poiblí, déanfar moill 2 lá air.De ghnáth, teastaíonn 5-7 lá oibre (Dé Luain go Dé hAoine) gan a bheith faoi thionchar moill eitilte nó tosca comhshaoil eile.Toisc go bhfuil ár seirbhís loingseoireachta ar fud an domhain, beidh amanna seachadta ag brath ar do shuíomh, mar sin d'fhéadfadh sé go mbeadh cúpla uair ag teastáil agus fan go foighneach má tá tú i gceantair nó tíortha iargúlta.1. Polasaí Fillte & Malartaithe
Glacaimid le míreanna a ceannaíodh ar roymall.com amháin. Má cheannaíonn tú ónár ndáileoirí áitiúla nó miondíoltóirí eile, ní féidir leat iad a fhillt orainn. Ní ghlactar le míreanna díolacha deiridh nó bronntanais saor in aisce le fillt.Chun bheith incháilithe le fillt, ní mór do mhír a bheith gan úsáid agus sa chéad chaoi a fuair tú í. Ní mór í a bheith sa phacáistiú bunaidh freisin.Tar éis treoracha fillte a fháil uainn, déan do mhíreanna fillte a phacáistiú agus do phacáiste a scaoileadh ag oifig an phoist áitiúil nó ag seachadóir eile.Déanfaimid do mhír fillte nó malartaithe a phróiseáil laistigh de 3-5 lá oibre tar éis dúinn í a fháil. Déanfar an t-aisíoc a phróiseáil agus a chreidiúint go huathoibríoch chuig do bhunmhodh íocaíochta.Ní féidir aon fhillt nó malartuithe a ghlacadh má táirgeadh an táirge go saincheaptha, lena n-áirítear méid saincheaptha, dath saincheaptha, nó cló saincheaptha.An bhfuil cabhair bhreise uait, déan teagmháil linn. service@roymall.com nó Whatsapp: +8619359849471
2. Polasaí Aisíocaíochta
Gheobhaidh tú aisíoc iomlán nó creidmheas siopa 100% tar éis dúinn an pacáiste fillte a fháil agus a sheiceáil. Déanfar an t-aisíoc a phróiseáil agus a chreidiúint go huathoibríoch chuig do bhunmhodh íocaíochta.Tabhair faoi deara nach bhfuil costais loingseoireachta agus aon dleachtanna nó táillí incháilithe le haghaidh aisíocaíochta. Ní féidir na costais loingseoireachta breise a aisíoc nuair a sheoltar an pacáiste. Tá tú freagrach as na táillí seo a íoc agus ní féidir linn iad a aisíoc nó a aisíoc, fiú má fhilltear an t-ordú ar ais chugainn.Nuair a fhaighimid agus a dheimhnímid do mhír fillte, seolfaimid ríomhphost chugat chun a chur in iúl duinn go bhfuairimid do mhír fillte. Cuirfimid in iúl duit freisin faoi cheadú nó diúltú d'aisíocaíocht.Má tá aon fhadhb agat maidir leis an bpróiseas aisíocaíochta, déan teagmháil linn. service@roymall.com nó 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.
