Those JBL speakers are great for those boxes. They are not “flat”, as in Studio Monitors flat. There's a picture that shows the EQ from my AKG headphones (the left image) to the boxes (the right image). I captured using a Sure Pro mic, so the curves are not exact. But you get the idea. You can see most of the coloring in the highs. Since I'm over 50 that works for me, as my hearing in that range has reduced quite a bit. Printing took 800 grams of filament. Don't use less as it will get too fragile. I used superglue to glue the front and the body together. For the back, I used small screws, by heating them with a soldering iron and inserting them into the plastic. I also used the iron to make holes for the wires. I didn't use any screw inserts. Just pure screws and it worked out great.
Uses the JBL Multisystem 5TRMS80 speaker.
https://www.jbl.com.br/28085199.html
For the amplifier, I used a Taramps car module. It has more power than I needed, so I never go past 20% of the power it has. The module is 4 ohms compatible in bridge mode. One thing that the manual didn't say is that you need to power the REM (remote) pin with 12V. Otherwise, the module won't power up. Also, there was a lot of hiss (noise), so I used a 5-watt 40-ohm resistor in series with the speaker wires. That took care of the hiss. I lost a bit of power, but since I still got a lot of power from the module it wasn't a problem. If I put this in max volume it would beat so hard that it would dismantle the box, I think. ;-) For the 12V power I just used my computer's power supply, as I have a 500-watt one and my system only uses 320-watt.
The author marked this model as their own original creation.