OK, so I suggested you make a new thread, and no one has answered yet . . . I feel bad about that. But usually starting a new thread works best if the topic question is changed to any degree. So hopefully you will get some helpful responses from folks who really know about speakers - which I do not.
A quick note that the link to "these speakers" in your new post actually goes to the link for the bluetooth amp on Amazon. So you might want to fix that.
Other than that I have a few comments I hope will be helpful -
1) Speakers you're looking at might match up OK with the bluetooth amp
I went back to your original post, and using the link there, I looked again at these speakers as listed on Amazon. There's a missing piece of info you need, which is the impedance for these speakers when they are hooked up using the crossovers (you would
not want to hook them up without the crossovers, by the way). A quick way to find out the impedance is to copy the JBC model number from the Amazon page (GT7-6C) and do a web search using that - this gets a hit for the JBC page on this product - link is
here. And that product page gives the impedance as 4Ω (4 ohms). Per the somewhat confusing info given on Amazon for that bluetooth amp, an impedance of 4Ω for the "2.0 mode" of setup (no subwoofer) would be fine.
Then there is the question of power handling, which is measured in watts. Basically this is making sure the average output (and also the max output) of the amp in question won't be too powerful for the speakers & thus risk blowing them out, on the one hand; and also won't be too weak for a given set of speakers and fail to provide the power needed for the speakers to perform their best, on the other hand.
In this case, the makers of that little bluetooth amp seem to be suggesting (see my last post in your previous thread) that if you're going with the 2.0 setup for that amp (i.e. left/right stereo channels, but no subwoofer channel), then 4Ω speakers that are rated at 50W each for average power handling and somewhat more than that for max power would be a good match.
As it happens, the Amazon page for your speakers lists them as "Power Handling: Peak: 300 watts per pair / RMS: 100 watts per pair." But given that the Amazon page seems to be untrustworthy, I'd rather go back to that JBC page for the speaker and noodle around to find what JBC says is the power handling for the speakers. What you want to look for is "specifications." There is a tab on that page for specs; and on that tab you will also find a link for a PDF that gives the complete specs for the entire line of that speaker type:
https://www.jbl.com/on/demandware.s...wf5c0398f/pdfs/JBL_GT7_Spec_Sheet_English.pdf
Scroll to the second page of that PDF, then scroll to the bottom of that page, and you'll see the full specs for the GT7-6C:
Peak power handling: 150W
Power handling, continuous average: 50W Frequency response: 50Hz – 20kHz
Nominal impedance: 4 ohms Sensitivity (2.83V/m): 92dB
So that would seem to match up pretty well. Again, if you went with these speakers, you
would want to use the crossovers - leaving them out would be a mistake. The amp just hooks up its stereo outputs to the inputs of the crossovers. (FYI, note that the picture on page 1 of that PDF does not show the product you're interested in, so don't be alarmed at it for showing what seems to be a single speaker with no separate tweeters or crossovers - that's not what you'd be buying).
HOWEVER - you may also want to scroll down to the
review comments by buyers of the GT7-6C (the specific model you are looking at) on the JBL page. Apparently folks think the tweeters are really, really harsh. Plus remember these were designed to be car speakers, not speakers going inside a box.
2) The video you link to refers to an "Instructables" project that you might want to look at
When I went to watch that badly made video again, I noticed a link on the Youtube page below it saying the video author has also created an Instructable for his project. If you go to that project page you'll find he lists parts & sources for every part he uses. And there are a LOT of parts. That page is here:
https://www.instructables.com/id/INSANELY-Loud-150W-Bluetooth-Speaker-Boombox/
So you may or may not want to build the project that he built - but if you are using it as a model for your build, at least you now have lots of details for how the guy went about his version of it. The only flaw here is that given you don't know much about speakers & amps, you would probably have a difficult time using his project as the takeoff point for a project of your own that used fewer parts, or cheaper parts, etc. etc.
3) Build around the bluetooth amp?
Let's say you don't want to go with the JBL speakers out of concern over comments about the harsh tweeters. You could think about getting some other pairs of speakers that would match up with this little bluetooth amp (i.e. 4 ohms impedance, 50W RMS [a.k.a. "average"] power handling and somewhat in excess of that for peak ouput). If so I'd suggest hunting for speakers on Parts Express rather than Amazon - Parts Express does a far better job of providing accurate specs & has prices that are at least as good for whatever it is you might want to buy. If you find a few speaker candidates you like, you could then come back and ask here about those candidates.
Plus, you could look at the review comments on the Amazon page for this amp - some reviewers may describe in general terms the sorts of speakers & other parts they used to build powered speakers around this amp. That too could be useful info. Similarly, speakers on Parts Express also have review comments, and those are always worth reading as to how other buyers are using the speakers - i.e. what sorts of enclosures, what sorts of purposes, etc.
And lastly, one other part you'd
definitely need for that bluetooth amp is a power supply! So you'd have to look into that.
4) This amp, or some similar amp without a subwoofer?
Now, to play devil's advocate, I'll offer a thought to the contrary: Given that this little bluetooth amp you're looking at was designed for use either with or without a subwoofer, you are sort of wasting some of your money if you don't go with a subwoofer as part of your speaker setup. What I mean is, you might be able to find a similar but less expensive (because no subwoofer provision) bluetooth amp to handle right/left stereo output at with similar impedance and power-handling.
And there is also the big, complicated matter of how enclosures affect speaker performance . . . but I’ll stop there.
A learning curve would seem to be involved here . . .
