eureka!, How to Make a (Speaker) drive unit Sound Good Without a Baffle or Enclosure

At your risk. Please take all safety precautions including protecting your precious ears. If a woofer with lightweight paper cone is held by hand and fed by a good quality very low power (protecting our ears) class A amplifier with no negative feedback through an inductor (inductor in series), the sound is surprisingly nice. There is somehow deep bass and the midrange nastyness is missing as the inductor lets the bass in and cuts everything else at a gentle slope of 6dB per octave. But treble is missing. But is the same speaker is disconeected from woofer out of the crossover network just used and connected to tweeter out the treble is very nice without the razor cutting edge of using a tweeter on its own. If said speaker is connected directly to said amplifier only mid nastiness is heard which covers in our perception both bass and treble. So said speaker is connected back to woofer out ie inductor in series. And then.... a capacitor of say 2.2 uF feeds it simultaneously from the amplifier! So we get trable too, the bass we had before and the mid nastiness missing. In fact the balace by chance was almost right the reduced mid blended well with bass and treble. And according to the experiment by Olson of RCA perhaps as many octaves were missing from bass and treble part of the human hearing spectrum creating a balanced sound. Since we have a single speker point source there were no phase errors and since no box there is no colorations. And according to speaking with Costas at Praxis studio hearing mid detail is important in creating or checking a mix, hence the Auratone speaker. But perhaps this is simpler and sounds better. The inductor has not been measured yet. The speaker used is printed at the magnet back: 00 80400/W4, 2422 257 28204, made in Belgium, DD 00 543 5. Signal path Italian 60's songs compack disc club compilation or Careless Wisper - George Michael on CD - Pleiades 2N3053 single transistor power amplifier in class A - said speaker. So the nice little trick is feeding the no baffle air hung drive unit with a parallel combination of inductor and capacitor in order to create a gentle slope low frequency (bass) high frequency (treble) pass filter or a gentle slope mid frequency regect filter. Obviously it cannot be used at high intensity (power) as the cone ir unloaded but it sounds loud if used at smaller distance and the most important is protecting our ears from high intensity.