ZK-TB21 TPA3116D2 Bluetooth 5.0 Subwoofer Amplifier Board 50WX2(R and L channel)+100W 2.1 Channel Power Audio Stereo Bass AMP

This is a DIY mini amplifier.I like it, small simple and pretty powerful for a flat or a normal room. Don't expect a Yamaha - Denon or something like that from sound quality.Connect it to a Makita 18 v 4 ah battery with 2 bookshelf speakers and you got yourself a party .

Same issue as Precious Amplifier 3.5mm Jack Playback is on Mono

This amp arrived in a plain cardboard packaging with a branded plastic bag sealed around it, inside the box you get everything you need to assemble it as shown in the product images. There are no instructions included in the box or product listing, but it's just a bunch of screws, brass stand-offs and some protective PCB panels. Even with the lack of instructions it’s very quick and intuitive to put together as there is really only one way that works, worst case you’ll have to disassemble it a little and redo something if you did it in the wrong order.This is a good candidate if you’re someone who’s making their own BT audio system with a DIY wooden or 3D printed enclosure. It’s affordable, small and lightweight and has a simple enough design that makes it easy to embed into a speaker box or attach to an existing setup. It will certainly work if you just want to double-sided tape it to a speaker, but it’ll look far neater if you panel mount it into a dedicated box as the unit itself only comes with black PCB covers for the front, top and bottom of the amp.Audio fidelity isn't ever going to be a strong point of cheaper generic units like this but for the price and the fact that it’s using a Bluetooth connection, it’s surprisingly good even while using salvaged speakers.I’m not entirely sure why people are complaining about the lack of a power supply with this, they’ve ordered a single part of something that is intended to be part of a DIY build or project, not a complete kit. The amp takes anything from 12-24v so it’s not exactly difficult to find an off the shelf power supply and chances are most homes will have an old 12 or 24V power brick from an unused device they could cut and wire into this amp.The only reason I haven’t given it 5 stars is because mine arrived slightly damaged right out of the box. One of the pieces of plastic that’s supposed to isolate the wire inputs for the speakers was snapped off, in my case it was the outer piece so it shouldn’t matter much, but it's still a little concerning. The loose piece of the broken plastic wasn’t in the packaging, so this was placed into the box after the damage occurred. It’s something I can personally fix or deal with, but it really shouldn’t be needed and not everyone is able and/or willing to fix something like this.Ultimately it's a decent little BT/AUX amplifier for projects and is worth grabbing if it’s the cheapest at the time, but double check it arrives in perfect condition if you do happen to buy one.

This is an interesting DIY amplifier kit for an apparently modest price. It comes in several physical parts that must be screwed together, using the supplied screwdriver. There are no printed instructions in the box but the video on the Amazon web page shows the method of construction. There are two cover plates that have to be attached in the right places so that no electrical connections are exposed. The plate with the control, input and output labels goes on top, covering the exposed electronics. The other covers the base plate to protect the soldered connections. The tiny screw pillars are used to mount the top plate. The accuracy of the sizing and screwhole positioning wasn't perfect but with a little adjustment the finish is satisfactory. The knobs are push-on type and easy to fit once the plates are firmly attached.A major problem with this product is sourcing a suitable power supply. The specs for this are on the Amazon web page, but not printed inside the box. This is a major omission in my view. Eventually I found a suitable power supply, with a variable voltage control up to 24V, at 5 Amps current. The plug has to fit A 5.5 x 2.1 mm DC socket at the rear of the amp, with a positive inner core.Also needed are six suitable speaker cables and three 4-8 Ohm speakers. The cables should not be too thick as the connections on the amp are around1.5mm diameter. The third speaker for connection to the subwoofer audio output should have a reasonably large bass cone to deliver the low frequencies.Once set up the sound quality through my old KEF bookshelf speakers was good. The volume wouldn't go up to very loud, which I put down to the speakers being 8 Ohm. 4 Ohm speakers should sound louder. But 8 Ohm still delivers a reasonable volume.On the positive side this little amplifier is useful if space is at a premium and it could easily be attached to one of the speakers with Velcro tape.The main negative is the cost, which appears modest, but adding the power supply doubled the price and was rather hit and miss matching it to the required specs. Other minuses are the lack of an insulated case and any written user manual. Nor is there any sign of CE or UKCA certification on the product or packaging. For this reason alone I would avoid it.

piccolo amplificatore Bluetooth 5.0 che connette facilmente i dispositivi audio preferiti senza fili, garantendo una connessione stabile e ad alta velocità, un amplificatore classe D che offre potenza e bassa generazione di calore, la scheda dispone di un controllo dei bassi integrato per regolare l'intensità dei bassi in base alle tue preferenze, oltre al Bluetooth, puoi anche collegare dispositivi audio tramite l'ingresso AUX. un accessorio discretamente funzionale, non adatto ad impianti particolari, ma per piccoli utilizzi non funziona malissimo, fa il suo dovere.

Dit is inmiddels mijn derde mini digitale versterker, en ik blijf me verbazen hoeveel vermogen zo'n piepklein apparaat kan leveren. Ik heb deze specifiek uitgezocht vanwege het aparte subwoofer kanaal. Twee Bose satelliet speakers op de L/R uitgang en een Bose Acoustimass subwoofer output. Gaat heel hard en strak, de voorkant van de subwoofer trilde er af. Misschien niet zo muzikaal als een dure A klasse versterker, maar voor het geld: perfect!

Es un amplificador bastante pequeño que permite meterle una señal por línea o bien Bluetooth y controlar de manera independiente los canales izquierdo/derecho y subwoofer, así como el volumen de salida de la mezcla.Como digo, es relativamente pequeña, así que para aplicaciones como máquinas arcade, droides, etc. sirve perfectamente.No viene fuente de alimentación, así que hay que adquirirla aparte.La mayor pega que le veo es que, para el precio que tiene (unos 40€ en el momento de pedirla), los acabados podrían ser mejor. Ambas tapas tienen un tacto áspero y la serigrafía no se ve muy buena. Aparte, viene con unos caps para los potenciómetros delanteros y son de plástico cromados.

Alles okay

Super matériel facile à installer et puissance au rendez-vous !