Monster magnet meets subwoofer...

I took an acoustics class in college where I earned a degree in electrical engineering. It was VERY high level. You would not believe all the the theory and math analysis that goes into optimizing a speaker's design. It doesn't surprise me that you didn't really improve the speaker. It is designed to tight tolerances with the parts that are there. The math in that class killed me. I almost didnt pass.

My cat was coming near me during the video. She was purring then exploded.

The basket may have become magnetized disrupting the magnetic field. Running a sine wave through the speaker for a while at moderate levels might help restore the magnetic field strength. I wouldn't know if the magnets were permanently changed. Neodymium magnets are usually used for small speakers, not large ones. It might be interesting to repeat the experiment with a field coil speaker. With and without the field coil working.

Maybe the weird results with the 20hz test have something to do with the selected frequency? Try using a white noise signal (frequency flat) with longer time duration (at least 10-15 seconds, but longer is better), and later analyze the frequency response differences. Perhaps you find that, for that particular frequency, the response is lowered, but increased for others. I'd like to see you try something like this in a future video.

An interesting alteration to the last test you did would be to play a sine wave sweep from 20Hz to 20KHz, and comparing the frequency response of them with/out the magnet

i love how you show what types of dangers the experiment can cause in the beginning, keep up the cool experiments

I think you changed the impedance rise on the 20hz cycle. If you could get power reading in real time I bet the subwoofer is receiving more power depending on the orientation of the neo magnet. If you have a clamp and multimeter you could get a power reading while playing the 20hz.

Since I said with my experience, crushed ice in a tube would be the safest way to bring magnets together, I always wondered how much it would affect a speaker with just one these magnets. 🤣

Hey Brainiac75, The most critical evidence of performance changes would come from the Thiele Small Parameter; Large Scale Parameters via Klippel would provide the most information as to the effect on BL over Excursion, and what impact this has on inductance, but that would be a pretty penny to accomplish. Typically, a shift in the BL will directly impact the Q parameters (Qts & Qes). The Lower the BL figure, and therefore a lower BL²/RE, would result in Higher Q parameters. Typically, the lower the Q parameters become, the more adequate a subwoofer becomes for bass reflex enclosure designs, whereas, the higher the Q parameters become, the subwoofer yields better performance in a sealed and/or Infinite Baffle alignment. If the Q parameters were being lowered, a bump also occurs in the response above the tuning frequency of the bass reflex enclosure as the driver becomes more resonant. Measurement of bandwidth before the magnet is applied, then post-application of the magnet being attracted to, and repelled from the magnetic structure of the subwoofer would certainly be the cherry on top.

The difference is probably due to the fact that the simulation isn't taking into account may things. For example, just a simple screw somewhere could slightly change the magnetic field leading to a different reading that then one you where expecting. If you were to get the real life setup as close as possible to the simulation, you would probably get closer results to resemble that simulation.

Oh, i can't wait for the audiophiles' expert opinions!

Now this is the magnet content I can get behind! We need more speaker magnet test videos 😂

That's actually a very nice subwoofer that you have. The box rise (Impedance rise) could have actually been affecting it. A very good way to tell if a magnet/magnetic field effects a speaker would to do the test while using shunt resistors in series with both coils (each coil having an independent shunt) and oscilloscope to see if the current increases or decreases while while watching the current waveform to see if anything changes.

Don’t let the magnet eat you. Magnet: nom. You: aaAaAaAaaAAaAAaaaAaaaa!!!

Oh boy this might go wrong. Speaker going BRRRRRRRRRRRRRRRRRR

It is more than 50 years that I operated in the electronic sector. When I begun, ferrite loudspeakers were still part of the future. The speaker at the time used iron magnets, and the most powerful commercial speaker was 4 Watt of power - which coincidentally was the same power delivered by a single ECL82 or 6AQ5 (beam tetrode) working in class A. 10 W speakers were reserved to Hi-Fi systems utilising a push-pull of two EL84 per channel. Again, there were no ferrite around. The speaker were reasonably efficient even with iron magnets, because a loudspeaker is designed as a system, where the moving coil mass and excursion is balanced against the magnetic field. Changing only one parameter can't bring improvements; the whole system must be re-dimensioned and re-optimised. With a stronger magnetic flux in the same air gap, you can increase the coil mass so it can handle more current, you can have wider excursion (which require higher damping factor) and a wider cone area, which in the end increases - in a non-linear fashion - the amount of power transferred to the air. In all of this, η (efficiency) varies wildly. Designing a speaker is a feat of engineering and, notwithstanding the existence of models and simulators, is still done manually because there are many competing factors. It useless to make an extremely efficient speaker if it is not linear. Neodymium speakers can be very small for a given power, but their linearity & bandwidth outside a speaker box can make you cry...

0:42 You forgot about the radiation risks

1) A 10% increase in magnet gap strength is only about 0.4dB SPL increase... 2) A resonant system is dependent on Fs and Q to get a response level. Way above the resonance, efficiency should scale with magnet gap field strength. At or below - you have to calculate the resonant behavior to get SPL difference. Lower field strength might give higher SPL at a certain frequency depending on the resonance function. Especially in a fouth-order system like a ported sub

That is the most strange subwoofer design I've ever seen

I never thought I would be sitting here on a Sunday morning binge watching videos from a fellow from Denmark and learning so much in a cool way. Thanks brother. May God bless you and draw you near to Him.