Dap Midrange idea nr 2 - plays a tune on its own for fun 

Thank you :) it was not intended as a tweeter, but seems to work up high, bit to much top end :)

thank you sir, i bet you can !

yeah the THD is mostly made out of 2e order, been single ended, so that should drop if i made it push pull. still would be the biggest factor (as it should)

induction is low as it should be,. distortion is relative :) 0.06% on 3e harmonics is rather low. for a driver that can do 200Hz-18Khz but yeah :) its not something that is complete.. i mean it looks like poo :)

@@joppepeelen Distortion I meant the second harmonic which at lower frequencies is about 300Hz 1%, although this is probably too low to force it to play for this size of membrane. Why do you think that induction should be low? An increase in induction leads to an increase in detail and elaboration of low signal levels, and in theory, the damping should increase as a result of better braking of the flat coil after processing the signal, I watched your video about disassembling the B&G neo-8 mid-frequency emitter, and saw that the magnets used there are only 1 thick .5 millimeters, which surprised me, but after thinking about it, it’s just the company’s marketing and saving on expensive magnets, it’s clear that to create a certain spl and amplitude-frequency characteristic characteristic of a mid emitter (with a block in the high-frequency range), they are enough, but the detail and elaboration of small levels decreases, I think If you do it for yourself, it’s better to use thicker magnets in such a head, 3.5 mm, for example, like in neo3, and place them on both sides of the membrane/coil. Firstly, this should make the distribution of the magnetic field more uniform and increase the induction.

Glad you like it, i never used a cnc service , so i cant tell. :( I know there is one in scheveningen that does such jobs but i have no clue about numbers

hihi well i think my class D is 100 if not 1000 times lower in dirtortion i think :)

@@joppepeelen Exactly. And some people find such sound "dry". 1% of the 2nd harmonic can be names a "tube" sound, and so camouflages D-class ideal digits. I personally noticed some softness, and then remembered that I heard your D-class -)

@ haha must have insane ears if you can hear class D in a recorded video trough speakers that add multiple of 100 times more distortion, let alone the mic room recorder , youtube + your amplifier + room acoustics and speakers :) or headphones :)

i dont know what distortion figures are common on tubes, but 2e order are the main thing in tubes ? i did not know

@@joppepeelen Depends. When it's used in a push-pill configuration, or in a super-linear, the 2nd is actively compensated, and 3rd prevails. But in a single ended pure class A configuration the 2nd harmonic is a lot. Also depends on a tube model of course: ones are more linear, others are "military" and don't care of a linearity. Depends on a selected working point. Etc. Typically these are from 0.1% up to 2%, but people like that =) However, there are few extra linear tubes which are considered to be "audiophiles" ones ))) Like GM70 or 6C33C. So, this is why I'm fine with listening to a D-class, especially if it has a switch dead time adjustments, very fast switches and comparators, and properly selected inductors and caps as an output LC filter. If it's a 1.5 bit delta/sigma with a full bridge output stage (so zero input is zero output instead of full rail spikes), this is an ideal amplifier.

i am not sure why that is, i and many others have the same feeling, they sound to me more interesting in general and although i have speakers that would measure better... they do not give me the same joy. im afraid i cant tell why.. witch i kind of find annoying :) since there must be a reason for it

Yes, just like compression drivers and strongly horn-loaded normal drivers planars and ribbons typically work in a homogenous field, and they're basically "spring-loaded" by the air compressing/decompressing when the membrane moves. Linear, amplitude dependent compression of a wave = 2nd harmonic

@Gersberms In headphones with a round, highly inductive voice coil, there will always be non-linear distortion, and we should also not forget that this is a speaker with all its characteristic disadvantages in the form of the inability to operate in piston mode in all parts of the frequency range.

​@@tillnewman830I think about that a lot. The resonant frequency of almost any non-woofer is way too high for my liking and the driver just really doesn't like to be outside its center position. On top of that, the magnet gap is super narrow - and if the voice coil is narrow too, for efficiency, that becomes a huge problem. I wish we could have a midrange speaker that resonated at 5 Hz or so. But spiders, surrounds, magnets, and all that hardware just gets in the way of this. The issue with planars and electrostats is of course the lack of surround, the whole thing is a tight membrane with its own non-linear spring forces plus the shallow magnetic field it operates in. Ribbons fix the issue of tight membranes at the cost of structural stability.

well the same thing happens with corrugation in the other direction unless its free to move witch it clearly is not in both setups :) just like a carver ribbon/planar

Ah, I thought the top and bottom was foam and the sides not 😊