AIYIMA S400 Active Bookshelf Speaker, 80W HiFi Bluetooth Desktop Speaker with 2.0 Channel 4" Drivers, Optical/RCA Output for Home Theaters and Studios

Really decent for the price. My new tv is so streamlined that it really can't have cables, so I've been using them hassle free via Bluetooth.

Great little speakers ,only one minor detail that could improve the item is maybe to fit the u.s.b port to the front of the unit ,other than that I can t fault the quality and performance .

So the description states this is a:-AIYIMA S400 bookshelf speaker has 3-inch 80W high-power speakers. HiFi BT bookshelf speakers Stereo active speakers USB TV sound home cinema.I wanted something for the bed room tv that was small but packed a punch.Thing is I've not got superman's hearing but I can hear a sound when it's not even ment to be playing anything. Which can get rather annoying for me, But my other half don't hear it.I got a friend who knows more about electronics and music, they said the frequency may need tweaking…Whatever that meansThe price at the time of this review is £79.99, which is a little high as I would hope for them to be banging perfect for that price.I will update this review if neededAfter it's been tweeked maybe.Fingers crossed*** What you get:-* Main unit* Vice* Power supply* Remote control & batteries* Manual* Optical fibre cable* OD audio cable ~ 150cm(black + straight 3.5st to 2RCA (white red)*** Detail's* Brand:- Aiyima* Quantity:- A pair* Size:- 35.5cm x 23cm x 18.5cm* Weight:- 2.6kg* Wattage:- 80w* Frequency Range:- 45Hz-20KHz* Impedance:- 4-8 Ohm* Channels:- 2 (2.0)* SNR:- ≥80dB* Max Power:- 100W* Input Power:- DC 21v* Mounting type:- Tabletop* Material:- ABS+Iron Mesh* Connectivity:- RCABluetooth 5.3USBOptical

Fantastic little speakers, plenty of input options, build quality is decent, but it's the sound quality that really surprised me, really good nice crisp highs very controled with decent separation, the bass is also quite good. Really pleased. For the price very good.

Took it out the box, plugged it in and nothing....dead as a dodo. Tried everything but completely burned out. Clearly just send any useless rubbish out the factory with no testing whatsoever! Complete joke - avoid!

Let me preface this with the fact that I'm a newbie when it comes to speakers. I just wanted to upgrade my computer's sound system with this set. So with that in mind, here were my thoughts on this speaker set:SETUP: The speakers come with quite a few wires, but it's very intuitive what to plug in where. One of the speakers is the "active" speaker that you plug everything into, and the second speaker is the "passive" speaker which connects to the active speaker only. The active speaker has a "power on" button on the back, and another button that has an arrow on it, which allows you to shift between RCA, Bluetooth, USB and Optical channels of connection. When I first switched the speakers on I didn't understand why it didn't play any music - but it was because it wasn't connected to the correct channel. So just rotate through the channels till you hear something if you're not sure which is the correct one for your setup. For my computer setup I used the RCA channel, connecting the RCA audio cable to the headphone jack at the back of the PC.SOUND: The first thing I noticed upon plugging this in was a quiet, subtle background buzzing / crackling / hiss, even without playing anything at all. The background sound seemed to alter depending on where I put the speakers. When very close to the PC it was more of a crackle; further away from the PC it was more of a hiss. My techie brother suggested it was amplifying the sounds picked up from the computer or wires. I'm a complete techie newbie so I don't know. I searched online to try and figure out if there was a way to eliminate this background sound. I read that the most common issue is "ground loop interference". I'm not yet sure how to fix this and will need to read up more for that but apparently this is fix-able.Background sounds aside, the sound quality is decent enough though is not eye-widenly, smile-inducingly amazing. It's certainly an upgrade from any tinny laptop speakers. But it's not as good as my stereo system's speakers.The sound is quite "flat" - it doesn't have a lot of depth to it. When you play an orchestral piece, it all sounds like the sound is coming from the same depth of field more or less.Overall, the sound doesn't sound as punchy and crisp and sharp as my higher-end stereo system speakers which I'm currently using connected to my PC, so for me these speakers would unfortunately be a downgrade. For someone who is moving up from really low-end speakers, these would likely be an upgrade.SIZE: Each speaker measures approx 18cm tall, 12.5cm wide and 11cm deep.ADJUSTABILITY:The speakers come with a remote control that enables you to change the volume, treble levels and bass levels.Straight out of the box, I had some trouble getting the remote to work, but once we managed to open the battery compartment and re-position the included battery, it started working. There is no indicator that the remote is working on the remote itself - no light goes on when you press the buttons. But if you look at the speaker, when you press a button on the remove, the blue light on the speaker blinks when it registers a remote-control button-press.The remote control enables you to move through 8 levels of bass, and 8 levels of treble. It works decently, though the effects can be subtle.ALL IN ALL:It can play music decently; it plays all sounds decently. But it's not at an A+ standard. It's more at a B+ standard in my opinion.