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In Reply to: RE: How to get the midrange right ? posted by beppe61 on March 27, 2015 at 02:29:23
Hey Beppestar,
"Bass", "midrange" and "treble" are merely words to describe regions of the audio spectrum. But, for me, in my opinion, personally speaking, from my experience, the way I see it, sort of, is that "midrange" is generally the range from about 250 Hz to about 1500 Hz.
With regard to your question about crossovers, my new speakers (in the works) will not have a crossover in the range of 200 to 1500 Hz. This may be irrational, but, it's where most music fundamentals and second and third harmonics are located, and I don't want to f*k that up.
I have no comment on MTM.
Follow Ups:
Hi and thanks a lot for the very helpful advice.
You say that you choice not to have a crossover in the range of 200 to 1500 Hz could be irrational. I do not think so if your assumptions are right.
To design and built a very accurate x-over in a critical range is very challenging i guess.
I would be interested to know about your new project.
Thanks again.
Kind regards,
bg
Bg:
Every driver has a unique distortion profile, just as it's frequency response is unique. A good designer will be aware of the drivers distortion and choose the crossover points and slopes such that distortion nasties are minimized. A driver may have higher distortion at one point in it's range, but if that point is sufficiently attenuated by the crossover then it's likely a non-issue.
Another thing to avoid is hard-cone "break up" which is a fast narrowing of the drivers dispersion resulting in a significant peak in output on axis. Some of the best drivers in the world (i.e. Seas Excel Magnesium cone driver) have nasty break up peaks which need to be addressed in the crossover. If not, they show up and color the sound significantly.
It's all about the designer knowing the drivers being used in many different dimensions, and picking his "poison"... and deciding which things are essential to fix, which are "nice to have" and which don't really matter at all.
If you want to see the distortion profiles of a vast array of drivers, go here:
www.zaphaudio.com
John Krutke is a top-notch DIYer (who designed his own line of drivers, and has kits for sale at Madisound.com) has exhaustively studies drivers and their specific attributes and has made these measurements available for people to view. It's very educational and super interesting.
Cheers,
Presto
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