This is going to be long winded, but I'll likely answer a lot of your questionsMy intended purpose was to replace an aging Bose SoundLink Mini 1 that I was using for music in my garage gym. The SoundLink mini is an impressive speaker when it's size is taken into account. They provide a deep, full sound and produce great bass, but struggle when turned up much past 60% (at least mine does, but it is old). What I wanted was a speaker that could get louder while still producing a quality sound. I found that in the Motion+.When I first unboxed it, I noticed that it is heavy and has a very solid build. It is, however, it's not beautiful. The rubberized outside feels good and feels like quality and there are two rubber feet on the bottom to keep it in place.When first powered up you are greeted with the power up and pairing tones. They are honestly less annoying than others I have heard, though I know of no way to disable them.Pairing was VERY fast and straightforward and I can get a good distance away (I didn't measure though) without hiccups.It comes out of the box with Bass Up mode enabled. Listen... Bass Up mode sucks. It honestly should be called Treble Down mode. Yes it increases the bass, but not as much as you can in the custom EQ.I played a few songs in Bass Up mode just to see what I heard and as stated above, did NOT like it. I then played with the provided EQ settings in the app. I think if you are going to choose a canned EQ setting from the Soundcore app, the "heavy" one is decent. After that I played with the "custom" EQ settings and the speaker really started to come to life.Once you settle on an EQ setting you like, the SPEAKER retains those settings. So even if you pair it with a different device it will still play with your EQ settings.Now, I also have a built in EQ on my OnePlus 6T and decided to try that. First I turned off the custom EQ settings on the speaker (best way to do that is to hit the BassUp button on the speaker twice. Once turns on the BassUp profile and a second one turns BassUp off, reverting to "bassoff" mode). My OnePlus EQ has some "general enhancements" setting that I applied and I played with the sliders and it sounded pretty awesome. Then, I applied my custom Soundcore app's EQ on top of that and WOW! One EQ was awesome and two were even better.My next major test will be to try the speaker from different sources. I have access to a couple Samsung S9s, some android tablets, etc. I don't own any iPhones so I can't test that out. I'll update my review after doing more testing.I played with it for a few hours yesterday and even played it a bit in my car on the way to work this morning. I did find that the sound actually seemed to change slightly after playing a while. I don't know if speaker break-in is real or not, but I believe that the bass has become fuller and warmer after a few hours use. I'll update on this aspect as well.I am eclectic when it comes to music so I'll give a quick rundown of the types I've tried and what I thought.- Country music: I played several Chris Stapleton songs and I felt this showcased the speaker the absolute best. All the instrumentation came through warm and clear.- Heavy Metal: This is a WIDE genre and will likely be what is most often played on this speaker (it's for my gym, remember?). I found that "industrial metal" (Rammstein, NIN, etc.) needed a little massaging in the EQ to separate sounds better, but sounded great afterward. I ended up leaving these minor adjustments in place because they helped all the other music too. Atreyu, FFDP, Volbeat, etc all sounded powerful, loud and full.- Rap: Honestly, on day one I was ready to say that this speaker just sucks for beat driven hip hop music. However, after playing with the settings and letting it "break in" (if that's a thing) I was wrong. For example, I recently played "come and see me" by Ludacris which relies heavily on a bass line that varries from low, to really low with some thumps thrown in. I could hear all the deep frequencies, the slightly higher bass tones, and the periodic thumps moved my speaker. After that I threw on UGK's "Gravy" which also relies heavily on bass and it sounded fantastic.Now, how about that bass, since that's why most of you are here. This speaker is able to play really low frequencies, but it will NOT "hit you in your chest". You will hear all the bass, but you wont feel the bass... why? Because it's a freaking portable bluetooth speaker, not your home theater system, your bookshelf system, or your car stereo. If you want to FEEL the bass in your chest or whatever, you'll need to pony up for a speaker with enough size to resonate those sound waves. Doing so, you'll likely lose a lot in portability and whatnot. However, I have heard that the "w-king D8" is a good bass head speaker. Check out some YouTube reviews (or just order it, it's super cheap).Another thing to note is that the high frequencies are capable of getting louder than the low frequencies. As you crank this up, the bass will reach a point where there just isn't enough room inside the enclosure. People say you "lose bass" as you increase volume, but you don't, you just stop increasing bass at a certain point while the treble keeps on going. I've ran mine at somewhere near 90% volume and I can tell you that the drivers are still increasing their work, because the speaker basically starts having as seizure. It's just that there isn't any more space inside to resonate the waves.The reason, and the ONLY reason this isn't getting a full five stars from me is that my speaker farts. Yes... you read that right but only when cranked to uncomfortable levels and bass heavy music. There are a couple possible reasons for this. I could be asking for the passive radiators to do too much (I have two EQs, after all). It could just be the way it's designed (although I have read a TON of reviews on here and Reddit and never seen anyone mention this). Or my unit is defective somehow. Think about that last one though. If I DO have a defective unit, and my review is still this good, what does that tell you?I will reach out to Anker/Soundcore support just to ask some questions because their support is amazing. I've had other products from them and they provide the absolute best support I've ever received.To end (for now), this speaker really should be an automatic buy if you are looking for a portable BT speaker with high end sound under $100. If you are looking for "slap you in the lungs" bass, get something LARGER. I don't care what brand it is you can't get more real bass out of a package this size... physics is physics.