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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Not using a super tweeterPosted by rickmcinnis on: 8/18/2022
I am using the Celestion Axi-periodic compression driver in the KLIPSCH K402 horn which I have boosted considerably when I noticed that the top one and one-half octaves were barely working when playing music so I figured WHY NOT?  and it works just fine.  Distortion measure high at approx. 19 KHz (1.5% thd) at a level one would NEVEr encounter listening to anything one would want to listen to.   I use a xilica Solara DSP which I would have scoffed at a few years ago and now I cannot live without it.  PEQ has come a long way and whatever compromises it imposes are more than made up by advantages from a smoother frquency response which in turn gives a smoother phase response..

There is a dip just before 20kHz but then there is a rise - when measuring with REW - so it is entirely possible this noise is being "heard" by the microphone.  But I am only sweeping from 20Hz to 20Khz.

You can be sure when i get home this afternoon I will measure with the light on and off.

I will need to ask REW to measure to 24kHz - I usually have it stop at 20 - so i have not noticed it before when taking measurements.

But my instincts are that you are right about the source - and better still, I hope you are right!

PS I posted about the inverter at DIYAudio since i spend a fair amount of time there at the PASS Forum - I must admit I posted it just to hear the typical DIYAudio experts tell me how stupid the idea was.  One fellow, who I actually like, made the inane comment of using the batteries to power my amplifiers which require 70 volts of B+ and another told me I needed to add LC sections to my power supply filters.  I love LC filters in the power supply but know all too well that too much of a good thing is not always very good but then I am not omniscient like the omnipresent DIYAudio naysayers.  It is like, instead of listening to their music systems they stare at the computer screen all day waiting to tell someone how their idea won't work with no intention of ever trying it for themselves and most assuredly having never tried it  It is fascinating.  

A fellow who goes by the moniker of PRR, who is a genuine expert on electrical stuff, gave me pause about the need for the ground rod; it may well be superfluous.  He said I should try removing the ground from the inverter to the "house" and to hear what happens.  It turns out the fellow who first posted about this is also trying this.  Makes sense to me.  But then i will know better tomorrow after I have tried it.

Hope the proprietor is not annoyed by my posting about this!

Thanks, Paul, and take care,

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