High Efficiency Speaker Asylum

RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's

24.22.235.48

Paul Joppa

P

In Reply to: RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's posted by Geary Lyons on October 28, 2013 at 23:12:02

The "Fig 5" circuit is a 12dB/octave Butterworth high-pass with a corner of 5300Hz. It therefor attenuates the energy going to the tweeter, 12dB/octave below 5300Hz. So it gives some pretty good tweeter protection.

In conjunction with the tweeter's falling response, then net total acoustic response is roughly equivalent to a highpass at 3000Hz, according to the manufacturer specs being quoted. But that is NOT what the electrical filter is doing, that's just the total effect of filter plus tweeter response.

Follow Ups:

RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Geary Lyons 15:29:25 10/29/13 (2)
Thanks PJ,
That makes sense. I can do the XO math, but understanding the total systemic effects mostly alludes me!!! So without more knowledgeable input from experts/wizards/engineers I wind up with lowest common denominator solutions. Just trying to make an even better match for the Paramours!!

Cheers,
Geary
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Paul Joppa 21:20:33 10/30/13 (1)
  This has a lot of similarities to what we did with the old "Climax" speaker design. A lot of tweeters have non-flat response (especially horns) that can be compensated in the crossover, but the book values have to go out the window to do it.
  - RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Geary Lyons 10:47:10 11/04/13 (0)
    Thanks PJ,
    I am pretty much a book values beginner on this. I started with the original EV crossover box and listened, measured and tweeked from there to get to my current XO. But, admittedly, I used "book values", i.e. the XO formulas in Excel and/or the online crossover calculators.
    I think the speakers sounds pretty good, with the exception of the high frequency steep roll off. They sound exponentially better than the factory XO boxes, but that is likely due to the much better components that I used versus the nearly 50 year old components. Hopefully the EQ circuit will improve on the tweeter results.
    I am always grateful to those who share their experience and expertise, because that allows me to achieve much better results than my limited expertise would provide.
    Cheers,
    Geary
    
    Edits: 11/04/13

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