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In the Forum: Horn-Loaded Speakers
In the Thread: Ultimate MF compression driver?

Post Subject: Not unequivocal evil.Posted by Romy the Cat on: 3/4/2012

Hm,… yes and no. Inductance is not necessary an evil. Well, it is an evil for open-top-end drivers but you need to look at the life of compression driver all around and then you understand that inductance is not limiting evil. Sure with grow of diameter inductance grows but so what? With grow of diameter the larger surface of diaphragm become more hanging in free air. You can’ make the diaphragm stiffer as you would like to keep mass as low as possible. As the result the driver pick up some break-up at higher frequency if the diaphragm is too large for given suspension. While it happens the low-pass filtration base upon the inductance of VC become quite a blessing as it slightly subdues the resonances that takes place over 25kHz. Do not forget that in case of compression driver no one wants it to go too high anyhow. A compression driver is load into horn and horn has own optimum bandwidth of 2-3 octave. No one need a compression driver that make 300Hz and 15kH. Well, idiots need it as they have no idea what they are doing but then have shitty 300Hz and shitty 15kH, thankfully for them idiotism in technical aspect comes alone with idiotism in sound perception and they luckily do not understand that they are get garbage.

The point is not in larger or smaller diaphragm but in a very delicate balance of diaphragm size, mass, suspension, mechanical and electrical dumping alone with dozens of other parameter, I do not see anybody make any claims that they know how to do it. There are success in one or another direction but no one owns the Unified theory of compression driver design. I think that inductance is not too much in the picture in compression driver. I am not the best example but take a look what I do. I have no obstacles to get any driver I want and to use it in any way I want and what I do with Macondo MF channels? I use relatively resonating driver with VERY resonating output tube and I deliberately introduce after my MF amp my own manageable inductance to hold the driver resonances in the format I want. So, I am not the best person to confirm that inductance is evil in unequivocal compression drivers.

The Cat

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