Logitech Z625 Powerful THX Auxiliary PC Speaker (Black)

let us talk about sound....1.The world has three popular home theatre systems...Logitech +UE/JBL + Harman Kardon/Bose...I believe Logitech spends the most on sound research. I am an audiophile and an engineer2. I have 4 home theatres Logitech Z333 (office 120 sq ft/40 watt RMS)...F&D t-200 x (living room 200 ft/70 W) & 2 nos Z625 (for bedroom/drawing room 300/600 sq ft) & scores of portable bluetooth i/c Logitech x300/Tribit Go/Aomais ball 2nos/tagg sonic/JBL flip 23. Logitech x300 & Z625 are my fav...reason-sound quality.4. Let us talk about only the sound and the Z 625 setup...Netflix/Prime video transmit sound in PCM/stereo + Dolby DigitalSound quality is determined by video resolution so you will have better sound if Video is 4K (just introduced by Prime by airing Tom Clancy's Jack Ryan)...I use 1080*1920 video resolution (or 2k or Full HD) that my TVs/!st gen Fire TV stick can deliver. 2nd gen Fire TV stick has just been introduced (Video 4K)Dolby Digital can give you max 7.1 channels while Dolby atmos can go upto 108 sound channels. Dolby Digital compresses sound by a factor of 10 so an uncompressed audio file for a 90 min movie in 5.1 format will be approx 8.3 GB (bigger than the movie video file), but only 800 mb in the compressed Dolby format. The Dolby receiver then uses an algorithm to reprocess the compressed sound file. I believe tha DTS/DTS X delivers a better compressed bit rate. PCM/Stereo delivers a sweeter sound...surround sound...PCM started as Pulse Code Modulation and as a .wav file in windows...AND is losslessTHX certification means 20 to 20KHZ (I have tested this on Z625) and THX speakers have to undergo more than 400 tests before a speaker is certified. THX is certified for sound quality alone....(Lucas Films refused to release STAR WARS in any theatre that is not certified THX...)Why Z625 2.1?1. I prefer clean stereo surround sound of PCM/stereo available on my firestick and iffalcon-TCL android certified TV.2. I hate the messy setup (wires & speakers) of 5.1 or 7.2 sound systems. Also a 5.1/7.2 system can only do justice to a sound across a single sofa.3. PCM files are only available upto 2.1 in netflix/prime others including blue ray4. I do not like compressed audio files. When sound is recorded in a studio they use headphones which are not supposed to sound good; they’re supposed to sound accurate (on very very expensive equipments). The sound engineer mixes the sound as he would like to hear us to hear it. But alas our sound systems/acoustics are far inferior....5. To setup Z625 please go your firestick-settings-display and sound -and turn off Dolby Digital. In your android TV turn off Dolby to stereo SPDIF6. The satellite speakers are to be set up like an equilateral triangle (60 deg) (that is why I hate soundbars). This means that the speakers are to be set apart at approx the same distance as you are (from them in the room...preferably at ear level).7. I use the lossless optical SPDIF output as it comes from the pre-amp from my TV. AUX out/Headphone out is connected thru the TV amplifier that adds noise and distortion and is to be avoided, Firestick connected to bluetooth receiver also delivers a poor quality sound.CONS: 8. I have HDMI arc on my TV but no inputs on my Z625. Also Z625 lacks bluetooth (I use a logitech adapter) and a remote9. Enjoy PURE recorded Sound...20 to 20KHz...the sound as the engineer had recorded on professional equipment. On Netflix/Prime Video when I watch UK/US movies or TV serials, only with Z625 I do not need to turn on the subtitles and instead can now concentrate on facial expressions etc10. Earlier I was making the mistake of turning on Bass >70% so that was overpowering vocals. Keep bass levels between 45-60% for 90% of netflix/prime content. MUSIC...I watched Arijit Singh live (MTV-Gurgaon)/Cold Play etc on Z625 & do not need to attend LIVE concerts.WHY Z625: This has SPDIF optical Toslink for lossless connection. Also I believe that Logitech has designed to do away with frills and give us a budget studio quality Home Theatre without compromising on soundHappy Listening,Sanjay143Note: I have not purchased Z906...but Logitech products are timeless classics....I have heard all i/c Bose Soundbar 700/Polk Signa 2 but there is little comparisonRemember a chain is as strong as the weakest link...best to worst for audio frequencies....HDMI ARC/SPDIF/Coaxial/RCA/Aux/Bluetooth for speaker connections.

Thanks amazon for prompt delivery, I ordered on 11th and got on 14th evening(Mishandling by courier XD)Okay, let me tell you this is best speakers I have listen to from long time, once I installed JBL basstube with edifier speakers and powerful amplifier, and now these speakers give better sound (THX Rocks)Don't get distracted by bad reviews, they dont know a word about speakers. THX and bassPROS:Bass 11/10Treble 9/10Looks 10/10Feel 10/10Build Quality 10/10 (heavy and beautiful)Connectivity 10/10 (Easy to install)Can easily disturb your neighbours XDCONS:Right satellite speaker wire is thicccc afMain connecting wire is thin af, logitech tried to do cost cutting at wrong place!BASS will invite your neighbours XD, try some good bass songs at 12 midnight LOL//Final Verdict//If you are thinking to buy some good quality speakers for long time under 10k then this is must buy, you wont regret!I got this for 7,499 rupees, Go ahead and buy this baby to enjoy music, movies and games(THX boosts a lot!)//Tricks and Tips//If you are using 3.5mm jack connection then connect to right satellite speaker aux port, IDK but sound quality improved like 10-15% LOLPlace your subwoofer on floor and in corner of room for damn smooth bass//EDIT// After 15 days of usageMy parents are not allowing to play anything on this beast (XD just kiddin) I am using only 10-15% volume knob and thats super loud and crispExcellent bass and sound quality without any distortion or mufflingPeople complaining of muffled sound is legit, but it is totally device based, my honor phone delivers not so powerful outout so it muffles sometimes, but with my ROG laptop output is excellentBass may be low with normal 320kbps songs, so you can use equalisers, in my case I am using sonic studioIn case of movies, equaliser plays a key role, as dialogues may not sound great or clearFor gaming, THX plays thumping and crisp sound!I have not used more than 50% volume knob (Wrna pakka police aa jayegi LOL)// EDIT - 14/10/2020Quality is crisp and detailed as day one but some minor problem such as left speaker kind of stops playing and have to manually check on backside of main unit - I will fix that but still its a small issue that you should knowQuality is fresh as day one and enjoying FLAC/WAV with balanced equalizer.THANKS! AND BUY THIS BEAST without any hesitation, must buy with laptop or PC setup, Thanks logitech for this heavy bass setup! I will definitely buy Z906 in future!