AK45 Pro Audio Amplifier Bluetooth 5.0 HiFi Stereo Amplifier Max 410W 2.0 Channel Audio Power Amplifier Mini AMP Receiver 12V/5A Power Supply with USB, SD, RCA, LED for Karaoke

It works as expected

Reduced my rating by one star because upon new power on the amp defaults back to aux in setting. I only use the FM receiver. Would have given 5 stars if restart would default to the last user setting. Otherwise all is good.

I absolutely love this receiver. It sounds great with some decent speakers. I have it wired to speakers throughout my back yard and also inside of my home. The separate channels works great during our gatherings. It allows us to have the music in a particular area or throughout the entire house and backyard. The only issue that I have with the unit is that the Bluetooth signal is somewhat weak, might be because I have brick walls between rooms. Once everything is connected, it sounds and operates great. I love it

There are some quirks and get ready to experiment as the instructions are ridiculous due to a poor translation, but the amp puts out some decent sound with little distortion and at a fair price.Just a single analog left/right RCA input (no 1/8 inch stereo jack, AUX or digital inputs), 2 microphone inputs for karaoke or PA use, Bluetooth connectivity, a built-in stereo FM receiver, USB or SD card music file playback and a remote control (albeit a peculiar working one).The treble and bass control is good and the amp volume control is smooth working.The seller says of the remote control "...operation is simple and easy to understand, allowing you to do whatever you want".The remote IS NOT easy to understand and does not allow you to do whatever you want.Be sure to have the volume on the amp turned up as the remote volume control works where the amp volume was last set, example: you turn the volume on the amp way down and you can't turn it up with the remote, turn the volume on the amp way up and you then have up and down control with the remote.The remote on/off only puts the amp into (I guess) a stand-by mode, it does not fully turn off the amp.The microphone(s) plugged-in are independent of any of the other controls on the amp (and remote) other than the Mic Vol control and the main on/off on the amp.If music is playing via any of the other inputs the Mic Volume is separate from the music volume.The remote does not control the microphone(s) you have to go to the amp to control the microphone(s).Regarding the seller's listing that all three models (the 35, 45 and 45Pro) have "echo" as a feature, they DO NOT. I'm guessing that would be with a microphone for karaoke use - and nice to have, but again, that's on a different amps than the 3 listed above.I loaded a USB thumb drive with music MP3s and they sounded good and were easily controlled on the amp. Playing music via Bluetooth form my phone sounded good too, just good luck with the instructions helping with set-up.It comes with AC power cord and seller says "With 12V 5A Power Supply" but that means it has a power INPUT for the option to be powered with 12 volts, 5 Amp; a car or other 12 volt power supply.I had no way of testing the power ratings, and I have my doubts (I peeked under the hood, 2 7N65 mosfets), but you shouldn't be hooking big speakers up to these amps anyway, and as I stated, the sound (and volume) is very good through the high end bookshelf speakers I used.Weighing in at just 1 pound 7.5 ounces (23.5 oz or 666 grams) and only 6-3/4" wide, 6 1\4" front to back and 2 3/4" high (approx. 17.5 cm x 16cm x 7cm), you get a lot of sound from this small amp, but again, get ready to play with it and take notes to figure out the controls.

I have a large Technics amp I was hoping to replace with this. I still could. It does the job.My TV/home theater consists of an amp and two towers. The towers have a tweeter, mid, and 2x10" woofers. They're 8 ohm with 91 dB @ 1 watt efficiency.For my small movie/music room, it did the job. There was a noticable hiss in the sound, and a fair amount of high frequency distortion. The bass sounded great. It was a little fatiguing to listen to. I won't be replacing the Technics amp, but it can do the job of driving my speakers surprisingly well.I don't think most people would be picky though to notice or care about these little grips. It works fine, looks cheesy, and if you're not picky about this stuff, I bet you like it.

This small compact amplifier offers a lot of features for a low price.Notable features include:• Five input options: • Line-in (2 RCA jacks on rear) • BlueTooth • USB (jack on front panel)) • Memory Card reader (on front panel) • FM Radio • Microphone (2 jacks on from panel)• Small compact all metal chassis• Digital display for source and radio• Treble and Bass controls• Microphone volume control• Large illuminated volume knob• Wireless remote control• Powered by 120v AC or 12 volts DCAt the time of my order, the unit was priced under $40. At that price-point, with this many features, you might expect a few compromises, and you’d be right.I hooked the amp up to two high-quality two-way bookshelf speakers. It sounded pretty good as long as you did not turn it up any more than 2/3rd of its max volume. The listing claims “RMS 50Wx2, MAX 410Wx2”, which implies that each channel of this amplifier produces 50 watts RMS. (You can ignore the 410 watt claim, as RMS is the only accurate way to measure power output). Based on my use with a pair of small speakers, it seemed the 50 watt claim was unrealistic. To find out I fed the amp with a clean 100Hz tone and measured its output with an oscilloscope, which allows you to view both power and distortion.As I suspected, the amplifier output was significantly less than the claimed 50 watts RMS. It reproduced a clean signal up to about two thirds of its max volume setting after which it started clipping, which is bad for both your speakers and sound quality.Getting the best sound out of your speakers requires matching them to an appropriately sized amplifier, that doesn’t necessarily mean you need a big high-power amplifier, it really depends on the size and efficiency of the speakers. This small compact amp should be able to power a set of small bookshelf or patio speakers with good results.I did not try the microphone/karaoke setting. Most of my use was with the line input setting. I did try the FM radio using the supplied single wire antenna, I was surprised how well it picked up radio stations, as we live in an area with poor radio reception. The radio tuning is “automatic”, you can’t dial in a station, the amplifier scans the FM band and you can cycle through the stations it has found using the Prev/Next buttons on the front panel.The line input uses two RCA jacks located on the back, depending on your source, this can be inconvenient. I prefer compact amps that offer both RCA and a stereo mini jack input, but that is a mild inconvenience and inexpensive high-quality stereo mini to RCA cables are available on Amazon if you don’t have one handy.The speaker connections are push-tab type, which are large enough to accommodate 12-gauge speaker wire, which is more than sufficient for the output of this amp.As far as fit and finish, the case is all metal and the illuminated volume knob adds a bit of style to the controls. The other controls worked as expected.I think that about covers it.Bottom line: An inexpensive, compact, feature rich amplifier, suitable for small speakers.

als ich das Paket ausgepackt habe ist mir das leichte und sehr kleine Gerät erst mal aufgefallen und ich dachte der Verstärker ist nur das Gehäuse .Nun ich habe den Verstärker an meine Standboxen angeschlossen und er hat schon kraft was da raus kommt was raus die Hohen und Mitteltöne sind sehr gut getrennt und gut hörbar leider ist kaum Bass , für die jenige die gerne viel Bass beim Musikhören bevorzugen ist ein teureres Gekät sinnvoller für Hindergrundmusik ist der Verstärker sicher gut geeignet.

Bra förstärkare. Väldigt lätt att koppla upp Bluetooth på. Bra ljud.

The media could not be loaded.  Der WOOPKER HiFi-Verstärker AK45 Pro Mini Bluetooth 5.0 Stereo Verstärker ist seit 2017 der 7. Miniverstärker und der Erste aus dem Vine Club. Danke dafür. Der Älteste hat leider den Geist aufgegeben und sagt leider keinen Mucks mehr. Alles dazwischen war irgendwie nie so genau das was ich wollte. Ich brauche den Verstärker für unseren Fernseher. Der Verstärker wird über die Kopfhörerbuchse angeschlossen und soll mir den Ton etwas näher an mich heran bringen soll heißen die angeschlossenen Lautsprecher stehen ca 3,5m vor dem TV. Der Verstärker wird durch eine smarte Steckdose auf Zuruf ein und aus geschaltet. Der Eingang : Line vom TV soll als erstes aktiv sein und die letzte Lautstärke erhalten bleiben. Dies dann auch ohne irgendeine Musikuntermalung oder weibliche Kommentare wie z.B. Aux mode . Genau das macht dieser AK 45 Pro zuverlässig! Den angeblichen 3,5 Aux Eingang aus der Angebotsbeschreibung habe ich allerdings nirgends gefunden. 2x Chinch sprich RCA von hinten an erster Stelle, Bluetooth als Zweites ( einer meiner Vorherigen fing immer mit BT an) dann FM ( mit externer Rundstrahlantenne ein erstaunlich guter Empfang - Scannen ergab 24 Sender) danach USB/ SD leider ohne Zufallswiedergabe . Die Einstellungen sind entweder über die Modetaste am Gerät oder der Fernbedienung zu erreichen. Das Zahlenfeld der Fernbedienung kann als der Direkteingabe im Radiomodus für die Sender genutzt werden. Die Taste EQ bringt bei mir keinen Effekt. Im Bluetooth Modus mit meinem Handy verbunden kann ich mit der Fernbedienung die Titel vor und zurück springen. Die BT Verbindung mit meinem Echo macht daraus ein prima Internetradio -dies wird aber leider doch erst einmal mit einem Jingle bestätigt, den ich glücklicherweise bei Line nicht habe. Die Lautstärke geht recht hoch und das ohne Verzerren. Die Regler für Höhen und Tiefen bringen tatsächlich eine nutzbare Klangveränderung. Alles in Allem empfinde ich diesen Zwerg als absolut gelungen und das für ein VK in den Dreißigern. Ich hoffe das er schön lange durchhält- die Boxen stammen von meinem Microturm aus 1996 wo sich ein Kanal verabschiedet hat!

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