PyleWireless BT Receiver Wall Mount - 100W In-Wall Audio Control Receiver w/ Built-in Amplifier, USB/Microphone/Aux (3.5mm) Inputs, Speaker Terminal Block, Connect 2 Speakers, White - PWA15BT

I purchased one of these to use in one of the Bathroom's in my house, so someone who was taking a shower could listen to their music list while showering or doing their makeup.The In-wall amplifier was super easy to install. I put in an extra deep electrical box, mounted the transformer in the rear of the box, added a switch to work a second pair of speakers, (Which I will probably add to the Kitchen, later), and was able to fit everything in the wall, with nothing interfering down the front of the wall or with the receptacle.I was so surprised at the amplifier, that I purchased a second one to install in one of my rooms where I have a tanning bed. The Amplifier is very strong. In the Bathroom I am only able to run it at 1/2 volume. It powers a Pyle 200 Watt dual channel waterproof speaker and the sound quality is much better than I expected. The "Bluetooth" connects every single time. I have not had a single glitch. When you power the unit on, there is a voice that says "power on" and then "your device is connected". It is a female voice that was a little bit annoying at first, but I have to tell you that I am so impressed with how well the amplifier works that I have gotten used to her. Heheheheh. The Unit works very well. It was very reasonable. I got my first one on sale, paid about $40 bucks for the second one. I bought the transformer off Amazon. Just made sure to match the power output. It cost $12 and I felt was worth it not to have a cord hanging down the front of the wall, and I found a Pyle 200 Watt Dual Channel, waterproof speaker on Amazon, $23. I paid about $5 for the extra deep add-on electrical box, so about $80 total for the entire project

I have 8 of these installed around the house. We did a reno and I was able to pull new wire and use some old wiring so I have different wire types at each location but it all works. We were also able to add some outlets in the attic which made it much easier than running the power all the way to a single large 12VDC power supply. I can confirm that running the power 50ft did work but I like having extra outlets instead.I can't comment on the quality of the sound since we also used various speaker brands depending on the room and not all have attic boxes around the speakers but so far they sound good to us and are easy to hook up to with Bluetooth. The Aux wiring in the back made it easy to pull over to the TV in each room.My only gripes are the manual which is nearly useless (hence my picture attachment).The other is that with 8 of them, they aren't all unique, I think 5 are different and the other 3 are the same ID on Bluetooth so sometimes it can hook to the wrong phone depending on who has each linked to their phones.

Pros:* Very strong, clear signal easily powers 6.5" 250W speakers,* very convenient form factor,* versatile inputs,* easy BT pairingCons:* Unreliable quality (one of two units bad),* USB charger generates noise on 3.5mm stereo input when in use,* BT output is much louder than 3.5mm output and there is no documented way to adjust gain on output* Not all wires are labeled or documented.* Bare bones user manualI have to give this 4 stars instead of 5 because one of the two I bought was defective. The good amp produces loud and clear signal. I love it. I was surprised by how well it powered my 6.5" 250W Pyle speakers. If that were the only criterion, I would give it 5 stars. But unfortunately, the other unit was weak. I had to turn the volume knob up all the way to get decent sound - and then when I switched to bluetooth and the robot voice says "Power on" it was way too loud. So I know that the problem with my second unit was strictly with the stereo amp circuitry and not the speakers.But sound quality was not the only defect. When I used the USB port to power my Amazon Echo Dot, the 3.5mm input stereo signal was full of noise (on both units). But since the USB circuitry is not isolated properly from the stereo amplifier, whenever the power is on, there is a buzz in the speakers.However, I tested making a Bluetooth connection to my Amazon Echo Dot while it was plugged into the USB port and there was no noticeable distortion as there was with the 3.5 mm stereo headphone input. In fact, the BT connection is so loud that I have to set the Echo Dot to 30% volume and turn the amp's volume knob almost all the way down. If I were to crank it up all the way, it would surely blow out the speakers - so we will have to be careful. I wish there were a way to tweak the gain to prevent ear and speaker damage.My original review recommended against getting the USB port as a waste of money. If one intends to use the 3.5 mm stereo input, then the USB port is almost certainly unusable. However, with Bluetooth, it turns out to be quite useful and I'm glad I have it.Amazon took back the bad unit with no hassle and I will buy this or similar model to replace the bad unit.Update: I replaced the unit and the new unit generated noise with no USB input at all when it was set to use the stereo input. However, the bluetooth input outputs a clear signal with no noise. I suspect that the circuitry handling the 3.5 mm stereo input signal is sensitive to RF interference. I did not attempt to track down the source of the noise in the second case, but I suspect it is a design flaw in the unit. Be aware when deploying this unit that it can be a problem.For my application, Bluetooth suffices. In fact, it is more convenient than using a wired stereo input. I use an Amazon Echo Dot as the Bluetooth sound source and this allows me to put the Echo Dot anywhere in the room (where the power cable is less noticeable). It also allows me to use my cellphone or laptop as a sound source.If there were a Bluetooth only version of this, I would use that.