In Reply to: RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's posted by Paul Eizik on October 25, 2013 at 10:03:53:
Paul,
I am going to stick to the stock ST350's. The EDS that grindstone posted shows 3 alternative XO/EQ examples. 3kHz, 3.5kHz, (X36) and 6kHz. I could go to a 3.5kHz, Linkwitz-Riley alignment, (that is what the X36 appears to be, then add the EQ, but that is more components in the signal path. And I would have to buy new air core inductors. Also, I am concerned with taking the ST350 that low without the tweeter protection circuit, which adds even more! In your opinion, should I be concerned?This is the 3kHz:
![]()
I like the current 4700Hz, but you shared some concerns. Since 4500Hz is 1/2 octave above 3000Hz could I not just multiply these values by the SQRT of 2, (1.4)? That give me a C 3.4uF and the L .448mH. That calculates pretty close to a straight Butterworth filter at about 4100Hz, so I assume the EQ is from the filtering of the 3kHz hump in the raw FR.
The 6kHz example has me confused. My electronic mathematical skills are limited, but if I am reading this correctly are they saying to parallel 3 inductors to have an effective inductance of .12mH? .
![]()
Here is my confusion, .12mH in the crossover would not get a filter anywhere around 6kHz. Am I missing something here?
The 3kHz bumped half an octave seems the cleanest alignment, with the fewest components. (And close to good foil inductors that I have to hand!)
Is my logic faulty on the "bumped" component values to get to approximately 4.5kHz AND have the desired EQ?I really appreciate your, and everyone's, input on this Sentry odyssey!
Cheers,
Geary
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Geary Lyons 10/28/1323:12:02 10/28/13 (9)
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Paul Joppa 15:03:46 10/29/13 (3)
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Geary Lyons 15:29:25 10/29/13 (2)
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Paul Joppa 21:20:33 10/30/13 (1)
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Geary Lyons 10:47:10 11/4/13 (0)
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Paul Eizik 12:45:29 10/29/13 (4)
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Geary Lyons 14:18:28 10/29/13 (3)
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Paul Eizik 20:33:54 10/29/13 (2)
- RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's - Geary Lyons 23:01:17 10/29/13 (1)
- RE: Sounds like a good plan! - Paul Eizik 16:51:39 10/30/13 (0)