AIYIMAS400 80 Watt 2.0 Channel Home Audio Active Bookshelf Speakers with Bluetooth/Optical/RCA/USB Input for TV,with Woofer, Horn Tweeter,Remote Control

PROS: Decent build quality, Includes all the accessories, 3 Inputs, Good sound quality, Minimal design. CONS: Build quality for the price could be better. No Left/Right indicator/marking INTRODUCTION: In this review I am going to test and review their first speaker product (S400). I am only be focusing on the sound and build quality. (Check Nathaniel Huggins for detailed review of the build and inside). Before I begin talking about the sound quality and frequency, I would like you to know everyone has different hearing and taste in sound, so don't take this review too serious. WHAT'S IN THE BOX: You get a 3.5 mm to RCA cable, user manual, optical cable, power supply, and a RCA cable for the other speaker is pretty long. FIRST IMPRESSION: After unboxing the speakers I got immediately hit with confusion. Which one is left or right? The passive speaker is the LEFT speaker and the one with input indicator is the RIGHT speaker. Other than the build quality is ok, it doesn't feel cheap but weighs a bit than I expected. There are really no other indicators except for the lights and the user manual doesn't give a lot of information about the speaker and remote. The remote, yes the remote is simple to use except there's no indicator level for TREB-/TREB+ and BASS-/BASS+. Here's what I learned, treble and bass adjustment only has 4 steps. So thats -4 or 0 or +4. -4 is less, 0 is normal, 4 is emphasized (treble or bass) Other than that good selection of inputs. SOUND QUALITY: I am not expecting a lot since this is AIYIMA's first attempt at building bookshelf speakers. Just note it is impossible or demonstrate how these sound over the internet so take this review with a grain of salt. Most of the testing and listening was done on Bluetooth and RCA input. About the sound. The S400 delivers very good sound quality. I would describe the sound as Neutral Bright. I have played TOTO, Journey, Billy Idol, Fleetwood Mac, and many artists and it sounds good. The bass is good for the size of the 3" speaker drivers. They can get very punchy but the bass rolls off at 65 hz. If you want more subbass I highly recommend getting a subwoofer. Midrange is almost perfect, nice and balance. The treble department is a picky topic. Me I find the treble to almost perfect when listening up close. The vocals are emphasized and the claps and kicks are perfect, they're not piercing my ears. But if you don't like how emphasized the treble frequencies and you like rock, hip-hop, bassy music. CONCLUSION: At the time of writing the review, the S400 were retailing for 85.99 USD. And for the final thoughts I am impressed on how these perform and sound but I am slight disappointed the aesthetic design is lacking. It would be nice if it was covered in some wood vinyl. These speakers are versatile and impressive for the size. I find these to be really good at podcast and non bassy music but I wouldn't use these are reference speaker. UPDATE REVIEW: I took another frequency response of the speaker (Free Field). Thicker Line is common room measurement.

These are multifunctional speakers that can play music from a smartphone or digital music player via Bluetooth, play directly from a USB drive with music files, connect to RCA plugs and a CD or tape player, or to a digital SPDIF connector and your TV or DVD player. The remote has controls for on/off, play mode, volume, bass and treble tone, and the ability to skip around tracks using music players. The sound quality is good for a small set of speakers with highs, mids, and some lows. The bass response is good but slightly limited due to the size of the woofer. The box comes with the SPDIF cable, a remote, connection wire and an AC adapter. The adapter drives the powerful response from these speakers, and are much more capable than a battery powered Bluetooth speaker. The speakers are ideal for a small apartment, a dorm room or average size room. Mine are in a bedroom that is about 18’ x 15’ and the dynamic range and sound stage is good. I have purchased Aiyima brand amps before and that influenced my decision to try these speakers. Their powered IC and tube amps sound good and this set of speakers matches their audio quality. I would recommend these speakers to new buyers.

Alright, here we go. As a warning: I am an Electrical Engineer who has been designing audio equipment as a hobby for some time so I will attempt to review this as both a consumer and as an engineer:Consumer review:Packing: Excellent, 2+ inches of closed cell foam on all sides. Not too many useless bags, packaging seems to have been well thought out. my post office just stinks. They smashed a hole in it cracking the one speaker. That being said, I can review them anyway.Usage:Minor gripe 1: Speakers aren't labeled left and right. (Not even in the manual!) Easy enough to figure out but it would be nice to add a label.Minor gripe 2: No indication of volume level or when you are at max volume. In some ways it is nice to not have the typical bluetooth speaker "beep" but some kind of flashing light to indicate volume would be nice. Maybe even a small bar-graph!Sound quality:If you are hoping for a massive sound, don't buy them. I don't think they sound like 80W, more like 15 each at max volume. That being said, they are an EXCELLENT 15W. No distortion at all, perfect response, very pleasant to listen to and with a surprising amount of bass for their size.Build quality:They feel very lightweight but don't let that fool you, they are very well constructed. (see engineer's review)~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Alright, mine died due to shipping damage after a few hours of use so here is the engineer's review:Since the speakers died after a few hours, I decided to take them apart. Since I would be returning them anyway and they are dead, I figured there was no harm in holding the manufacturer accountable to the claims on their listing. So, let's see how they did: (Especially considering it doesn't sound like 80W, and the manual only claims 25WPower supply: 21V, odd choice but given the audio amp chip calls out 21V in the datasheet, I can understand,1.5A rated power output so this already caps the power output to around 30W average output power shared between all channels. (Lines up nicely with my 15W estimate from before I took it apart.)All internal rails seem fairly well filtered and use name brand-ish parts.Speaker selection:No info online for either, but the small one claims to be 6 ohm, and the large one 8 ohm. They seem to just be wired in parallel with a little added inductance in series so let's call it a 4 ohm load.Audio amp: CS8673E. At 4 ohms and 21W this amplifier is rated at 64W at 10% THD+N and 50W at 1% THD+N, but as stated earlier our PSU can't handle that. At 30W I would estimate excellent THD+N numbers which lines up with what I heard. (Maybe if I drove it harder over RCA inputs it could do 40-50W PEAK due to the large capacitance in the power rail, but not much more.)Overall, this chip appears to be a chinese clone of the venerable Texas Instruments TPA3116. That being said, they seem to have achieved much lower distortion and noise in the high end (and in practice, there was absolutely zero fuzz/noise coming out of the speakers with nothing playing.)Now for the elephant in the room, why it died: Shipping damage sheared a component off the board. AIYIMA followed all IPC guidelines for PCB design, and the thing is built well, they just got unlucky with mine.Now, if AIYIMA happens to read this, I have some suggestions for their engineers:1. Don't silicone down the flat flex cable where it goes into the connector. This binds up the pins in the connector and can result in intermittent connections. A small piece of kapyon or fabric tape is bot quicker, less messy, and much more reliable.2. I would love to see a version with a speaker grill. I have small children and I fear damage to the speaker cone if the speaker was left in reach.3. Add some indication of current volume level4. BP1048B2 seems to be the main chipset. Cool chip! I had never heard of "MVSilicon" Supports bluetooth 3.5 and is a 32 bit audio DSP5. The remote is too easy to lose. You have a DSP/microcontroller, can you program it to accept volume up and volume down signals from a TV Remove? That would be a MASSIVE selling point if you could use an existing remote to adjust volume.And some suggestions for marketing:1. Don't try to inflate numbers, you guys make great stuff. 80W from a 30W power brick? not possible. Even in the manual where it states "25W per channel" isn't possible. (Well, maybe if you are only playing audio into one channel...)It is a 15+15W system that can do peaks of 40-50W per channel so while yes, 80W may be true, it doesn't tell the whole story. (So many companies do this that if you tell people the actual numbers, they will trust you more.)Edit:I forgot to add, I decided to compare it to my TPA3116 amplifier fed into an old set of DCM KX12's and honestly, it put up quite the fight. It is VERY clear and they honestly almost sounded better than a pair of speakers an order of magnitude their size in every way but max volume. That being said, they are plenty loud to fill a living room during a movie and a FAR superior to a sound bar.

I love my music so I have several Aiyima electronics and they always deliver! These sound amazing. I have some on my PC and around my TV. If you're looking for small speakers with great clear sound, I recommend these Aiyima speakers.