I hope I was able to translate this well into English.
For medium to long term systems, EQ is a last resort.
If you try to solve a physical problem electrically, you will need to significantly attenuate certain low frequencies.
New feedback loop points may appear at other frequencies.
However, if it is a temporary system for just one day, or if time is the priority over sound quality, EQ may be your only option.
The volume coming from the speakers can be increased by dispersing the resonance points of the acoustic feedback loop of the entire record playback system, including the building, or by converting vibrations into heat or other means to lower the loop gain.
Enable the rumble filter.
If playback delay is acceptable, a delay machine or similar may be useful.
For low frequency oscillations, placing the record player directly on the building's foundation, or a similar method, is effective.
If this is difficult, or if a volume so loud that it shakes the building or the ground is required, consider floating the record player.
An easy way to check the floating effect is to carefully lift it a few mm with both hands while feedback is occurring.
Placing the record player on a box-like stand or similar will usually fail.
Disc stabilizers are sometimes effective.
Reinforcing the floor, stand, or player, or adding mass may improve the situation.
For oscillations above a few hundred Hz, the feedback loop travels through the air, so some method is needed to attenuate or delay the sound waves reaching the record or record player.
Floating the record player is of little use.
You may be able to change the resonance characteristics by using a disc stabilizer or by attaching a coin to the shell.
If you can't increase the distance between them, you may need a large soundproofing wall or even to completely enclose the record player.
The best solution to the acoustic feedback problem is to turn off the speakers and rip a vinyl.
When you want to listen to music, just play that file.
You'll be free from this annoying problem.
This produces a playback sound that is more faithful to the vinyl grooves than real-time playback in an environment where the loop gain is close to 1.
The adverse effects of various other sounds and vibrations will also be eliminated.
You will also be free from wear and tear on the stylus and record, and from dust and dirt.
This means you won't fall asleep in the middle of playing and have the needle continue to wear out until the next morning, and you won't have to worry about the tone arm bouncing around when you operate it while drunk.
It is cheaper than physical solutions.
If you want to add a nostalgic look while your files are playing, try spinning a turntable with your vinyl on it. However, please keep the arm lifter raised.
