Open baffle speakers

@bache you keep talking-down open-baffles, and saying "measurements", "measurements". So here you are, in-room measurements from the speakers I made, including open-baffle subwoofers to fill-in the lower octaves using REW and calibrated mic...

As you can see from the graph title, these are a stereo pair of Linkwitz LXmini's complimented with a stereo pair of Linkwitz Phoenix (alt) open-baffle subs resulting in a fairly flat full-range response. They are preamp'd, crossed-over, EQ'd and amplified with a pair of Hypex FA123 (one FA123 mounted in each of the Phoenix OB-subs). Why a stereo pair of subs - "don't you know freq's below 80 Hz are mono to the ear!" I say BS - stereo is stereo at every freq, and if you want to listen to mono bass - do your thing (but don't complain to me when it doesn't sound or measure the same). Regarding the subs... they are extremely articulate and 'fast' enough to keep up with the LXmini - my experience is anything less (sealed, ported, slotted, etc.) is less. What is the (alt)? While I encourage everyone to read Siegfried Linkwitz recommendations on driver selection (and every other topic)... "alt" means 12" Peerless Tymphany XLS830500 drivers made in Denmark (instead of whatever where the original recommended drivers). Each cabinet (of the stereo pair) receives two of these drivers mounted front-to-back and wired out of phase to cancel even-order distortion and provide inertial balance of cone mass. This is what the system looked like. I was testing-out a Denafrips Ares2 at the time - it added no appreciable benefit. Notice none of these speakers are very far from the front wall (the system is in a 600 sq.ft. bedroom) and plays louder than I want...

I read a lot of arguing which is typical on this platform (and sad for the self-proclaimed mature and skilled in the room). There are many ways to acheive audio bliss. For me (an engineer), same as motorcycling and other hobbies, joy comes from the journey more so than the destination. I realize many (maybe most) folks listen for the music; meanwhile, I listen mostly to the system. How well does it put me on the stage, convey the emotion of standing amidst the musicians and instruments first-person - instead of in the front row (listening to microphones, switchboard, amps and speakers). Long ago, I discovered that elusive realism comes from dipoles (same as instruments). I've had so many different speakers (e-stats, ported monster coffins, stand-mounted, etc.) in this room and so much gear (various amps, so many DACs, multiple power conditioners, expensive cables, etc.) and nothing out-does the current configuration: LXmini + Phoenix(alt) subs source is my wife's old (broken screen) Samsung phone running DeX outputting HDMI to the Hypex amps via Coax audio stripper. An invisible system that delivers video and spacious 2-ch audio flat full-range response. Why does it sound better than everything in the pile of abandoned speakers and gear that still occupies space everywhere (I have control) in the house? Listed in order of sonic priority: LXmini, OB-subs, signal is digital (no analog) all the way to the amps within the subs (no analog signals - not even XLR), only one (1) single conversion (which is digital to analog) inside the Hypex plate amps - no multiple conversions back and forth (ADC/DAC), reclocking or resampling/upsampling (like many systems). 

@bache I take all measurements from the listening position - about 8ft. in front and centered. Also, you can see in the photo that the LXmini and the subs are toed-in toward the listener(s).

But if go 3-4 feet to side the wave from front cone and back wil be eluminate each other

Yes! This is true, you have uncovered (for yourself) another wonderful benefit of open-baffle subs... they don't 'load' the room, don't rattle decorations, don't turn the walls, celing or floors into giant vibrating panels. You might also notice that (despite excessive endeavors to improve the sound) there are no audio-inspired room treatments. Even though I have 'improved' (further minimized) the system since the photo and measurements that I shared - there are still no room treatments. Why? Because they are unecessary - for exact reason you said... the drivers don't radiate sound from the sides (that would reflect all over the room) causing need of room treatments. Now, could the room be improved with treatments... yes, I'm sure it could - but the improvements would be so minimal as to not be worthwhile (for me).

To be find out which is better in you particular room there is best way to make A-B comparision

Again, I agree completely. This is not always possible, but I have endeavored it, comparing many different speakers in the same room and same system (at each time in history). Here's a photo from a previous itteration of 2-ch system, where I was A/B'ing LXmini against ML and Tekton DI's...

The only speakers I've had that have the same 'magic' as LXmini are the Martin Logan e-stats. Problem with those speakers is that the 'magic' only happens in a very small focused frame (head in a vice syndrome). The LXmini take the 'magic' and make it both more spacious and available everywhere around the listening area. Not all 'box' speakers are 'bad'. I've kept a few for various reasons... GoldenEar Triton One's are currently in the basement HT system as mains, GoldenEar Triton 3+ as rear surrounds, Martin Logan Motions as center and side-surround, and ML in-celings as Atmos (GE and ML both use AMT tweaters, so voicing is very similar), Elac were too good a bargain to resell and found a home in the garage system, and I learned a lot during my time with Tekton DI's. The Tekton's don't have the 'magic', but they do some things very well, resulting in me using them to fine-tune the crossovers and EQ of the LXmini + Phoenix(alt) subs. You might ask what 'magic' is missing from the Tekton DI's... they sound very good, flat linear and full-range response that is lightning fast. But when you listen to them, it sounds like you're listening to speakers - there is no 'magic' found in LXmini and other similar dipole designs.

BTW, I have made several in-room recordings of this system posted on YouTube https://www.youtube.com/watch?v=ZxwE9oiZfmM

@coltrane1 Thank you for your kind comment. There are several videos of the system on my channel. Regarding the subwoofer topic of this thread, I would recommend watching the video featuring Maggie Rogers "Alaska" - wonderful bass texture on that track.

@mark200mph You were writing about DSP crossovers, and their beneficial capabilities. While some will say DSP flattens the sound (Danny Richie being one), once you have the ability to adjust crossovers, parametric EQ, individual gain and delay on the fly while listening... its hard to imagine not having the capability.  When purchasing pre-manufactured speakers with passive crossovers, you're putting a lot of trust in the mfg that they voiced them to your liking, and that they will do what you want in every room, at all volume levels and across every genre of music you may enjoy. With DSP, you can save presets, and change them at will. I can't imagine a speaker a speaker so perfect that I wouldn't want to adjust it... maybe if it came with its own listening room, had a fixed volume and only played one song? Again, not bashing passive crossover box speakers - my HT system is littered with them. But for critical 2-ch listening, best be able to adjust.