Pyle Power Home HiFi Stereo Amplifier - 90 Watt Portable Dual Channel Surround Sound Audio Receiver w/ 12V Adapter - For Subwoofer Speaker, MP3, iPad, iPhone, Car, Marine Boat, PA System - PFA300

The PFA 400U amplifier is a Class D (Class T) with BTL output (to increase power out) which is non-inverting input to output, with 5 watts RMS output power into 8 Ohms. The channels are reversed input to output so to compensate either reverse the input RCA plugs or the output speaker connections. The tone controls on the amplifier cannot be switched out. The power can be switched off by turning the volume control fully off (counter clock wise). The remote can switch the unit to standby and the track being played will not be forgotten. The RCA inputs can be overloaded causing the amplifier to saturate. To prevent this, set the digital volume to 14 to begin with. The digital volume acts both on the RCA inputs and the MP3 player. The MP3 player has excellent response. Some amplifier BTL zero crossing error is present, as well as some low frequency distortion at 17 Hz, and some digitizing error above 1kHz. Overall the combination sounds “good”. Subjectively the amplifier and MP3 have enough adjustment range to adjust for personal preferences. I have noticed no noise output either with speakers or headphones. I play music at low volume levels (60 mW). All listening and measurements were performed with a Zitrades 12V4A power supply. As far as tone neutrality and distortion, this amplifier does not have a “direct” setting and will not compete with the Lepai 2020A+ or the Pyle PFA100 in this respect. Instead this amplifier is set up to offer more power and a variety of tone control adjustments with the MP3 equalization settings (5) and the tone controls to compensate for non-optimum speakers or non-optimum listening conditions when playing MP3 music. The Best 1kHz square wave presentation (with no overshoot and no sag in the waveform) is obtained from the amplifier with the EQ0 setting, the Treble about 11 0’clock and the Bass at 9:30 o’clock. The most uniform frequency response is obtained with the EQ0 setting, Bass at 9 o’clock and Treble at 2:00 o’clock. Caution must be used in using the equalization settings (other than zero which I use) since they are not designed to prevent digital saturation. In the era where digital music is recorded at the highest possible volume level short of saturation, the use of the equalization settings can cause saturation of the MP3 player output (typically from 61 to 500 Hz (bad)). Saturation introduces extra tones into the music (harmonic distortion). Lowering the digital volume setting will not prevent this. Personal preference will determine what is best for you. The MP3 player and amplifier combination has good frequency response from 17 Hz to 4 kHz, and response to 12.5 kHz, which as far as I am concerned is a minimum requirement. The phase error of the amplifier is far from optimum. The minimum output Bass phase error at 17 Hz is obtained with the Bass set at 1 o’clock. Treble phase response is unremarkable (about 90degrees at 10kHz) with minimum phase error at 1kHz. Do not look for stellar phase response from this unit. If you want better accuracy consider the Pyle PCAU15A amplifier and MP3 player combination (no tone controls). Monitoring the MP3 player output with an oscilloscope the response is basically flat from 17Hz to 20kHz with a sweep frequency (excellent). The 1kHz square wave response is textbook. The player loses lock on the square wave at regular intervals. There is good volume action in the PFA 200 (not overly sensitive for either the digital or potentiometer) with no potentiometer noise. The Noise output on the positive lead is 50 mV peak to peak of 715 kHz switching noise with 10 mV pp random noise. The Noise output on the negative lead is 50 mV pp consisting of high frequency components of ringing plus switching noise plus as small component of random noise.. The high frequency noise components are not audible. I could not hear any noise in listening tests. Power consumption with a 4A 12 v Zitrades power supply is 2.2 W at idle. Subjectively this unit has lots of adjustment to address loudness compensation, room response compensation and speaker compensation. There is good bass response to 17 Hz (with significant amplifier distortion at 17 Hz, with the distortion basically gone at 61 Hz). What settings work best for you will be trial and error based on your music source, your speakers and your listening area. This is probably not the ideal setup for critical listening under optimum conditions. All of the components of the PFA400 are on two PWBs (MP3 player and amplifier). The component side has both through-hole and surface mount components. There was considerable flux residue from hand soldering operations on the PWB. I cleaned the PWB both sides with alcohol. The operational amplifiers are surface mount. The Tripath IC is through hole and is clipped to a heat sink. I am enjoying listening to MP3 music with the PFA400U and my small refrigerator sized Bozak speakers. I use the stock 12 V power supply since I listen to music with a maximum output to the speakers of about 60 mW. The unit has as high convenience factor with the use of the remote.

Super-quality stereo amp for a reasonable price and I found an extra bonus! (Tell you later in the review.) I am really impressed with the sound quality for the price. The controls are basic but are useable and fairly precise. I hooked this small, well-made amp to some good-quality bookshelf speakers I had not used for years and got good low, mid and high-end response. I wasn't looking for ultra-audiophile response in a $30 stereo amp but I was very pleased with what it gives me. With an MP3/mini-jack, 1/4 in. mic jack, push-wire speaker inputs and RCA phono, it is adaptable to most any need. I'm not putting this in an auto, but you can do that if you want to. It comes with the power wiring for it (with a fuse holder.) What's the bonus? I plugged my electric piezo-pickup acoustic guitar into the 1/4 in. jack and the sound was really good even cranked up! I haven't tried running my (4) pedals into it yet but the guitar straight into the amp was hiss and noise-free until I had the volume up 'til around 80%, and even then it was acceptable. I think it sounds better and louder than my 15-watt acoustic Fender amp. Kinda wish I found this before the guitar amp! Minus? I can't seem to get it to work with my Android phone. I'll keep trying. Update 8/15/20: I had a bad mp3 cord. Found another and it works great with my phone!

This Amp is nothing special, which is exactly why you buy an amp of this type. It takes the signal, amplifies it enough to power a pair of smaller speakers (6 inch or smaller is best in this power range), doesn't have a large amount of distortion or noise, and isn't overpowered. Some would say that's a bad thing since I didn't say there is NO distortion or noise, and its not a powerhouse, but if that is what you are looking for, you are looking at the wrong type of product, and in the wrong price range. For most people, just looking to power a couple of speakers, who aren't going to nitpick everything, and obviously not in the "high end" audiophile market, this amp will probably work for you. Sound Quality - I am VERY picky in this area, and were I using for my main stereo setup, I would not be happy with it, but then again, that is not the type of setup this is for. It does have SOME, a very small amount, of audible noise, and a small amount of distortion at some frequencies/levels, but most people wont hear it, I have a trained ear and hear EVERYTHING. But the sound it puts out IS okay, and will sound good on most small speakers, or bookshelf size speakers. You can turn it all the way up without worrying about destroying your speakers and it does manage to this without distorting as much as many other amps will. If your looking for something to power a set of speakers in your garage, office, back yard, etc. this amp would do it just fine. Obviously its not going to push a set of 18" Black Widows, but it will give your ceiling speakers, bookshelf speakers, or small component speakers sound at comfortable levels from a decent/average source. I haven't tried the mic input to comment on that, but I am also sure it works as well given the fact this is a very basic Amp, and is just designed to work be nothing special, which means it does just that, works.

I am using this product with my computer, with 8 " speakers i dont think its a 100wat amp, sound is good with full volume, volume should be more, for a room good, but i don't think amp is worth at this price,

Cumple bien su función sin más pretención. Las uso para mejorar el sonido de la TV y dependiendo de las bocinas pueden sonar bastante bien. Llegaron muy rápido y perfectamente empacados (compré dos en un salto de fé) sí lo recomiendo.

IT IS FINE AND SIMPLE TO USE. IT FULLY SATISFIES ME REQUIREMENT AND EXPECTATIONS. SO I RATE IT 5 STARS

Good amplifier. I am paring them with some panasocnic 20w bookshelf speakers. They sound alright but i think a bigger power supply would help because its only 24 watts max on the provided power supply. Which amp it self can do 90. Other than that not a bad unit. I dont have the issues with noise or interferance. Id suggest getting a bigger power supply. As for my speakers they are low wattage so they are fine with the one it comes with.

Llego el producto antes del plazo indicado, en buenas condiciones y funcionando al 100% con un tamaño practico, sin duda una buena compra.