Hi.
I,m interested in building Mark K,s er18dxt. It looks like a perfect candidate for my next build.
However, the tweeter placement is off set. Now, I understand why this is but my "mental" disorder just can't deal with the visual.. . 🙄
How bad impact would it be to center the tweeter on the baffle?
Thanx and best regards.
JZ
I,m interested in building Mark K,s er18dxt. It looks like a perfect candidate for my next build.
However, the tweeter placement is off set. Now, I understand why this is but my "mental" disorder just can't deal with the visual.. . 🙄
How bad impact would it be to center the tweeter on the baffle?
Thanx and best regards.
JZ
I used Zaph L18 box for ER18DXT, Mark's xo. Not a big deviation from original.
You can simulate tweeter placement effect with Edge or VituixCAD baffle simulators. Both are freeware.
You can simulate tweeter placement effect with Edge or VituixCAD baffle simulators. Both are freeware.
An externally hosted image should be here but it was not working when we last tested it.
Don't worry about it.
You will simply toe-in differently(which changes with placement anyway).
Also, the DXT is less sensitive to near edge diffraction, in my experience, I quite like it.
You will simply toe-in differently(which changes with placement anyway).
Also, the DXT is less sensitive to near edge diffraction, in my experience, I quite like it.
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The Seas ER18DXT ported two way
And my speaker in modified Zaph L18 box (different tweeter location) - Remember, that with offset tweeter left/right off-axis responses are different!
And my speaker in modified Zaph L18 box (different tweeter location) - Remember, that with offset tweeter left/right off-axis responses are different!
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My svsound speaker are like that, tweeter off to one side, so each speaker is labeled left or right. These were only make as a Limited production run of 200 sets
So I wonder how they would sound if the tweeter was right in the middle of the motor board
So I wonder how they would sound if the tweeter was right in the middle of the motor board
I was always slightly critical of MarkK's ER18DXT design.
The Seas ER18DXT ported two way
I couldn't fathom why he uses an inaccurate Fs notch on the SEAS H1499-06 27TBCD/GB-DXT.
I totally get the bass filter with a notch slightly above 4.5 kHz: H1456-08 ER18RNX.
But the 1.5kHz Fs series tweeter notch is just plain wrong. It should be at about 800Hz on a resistor of about 8R. 😕
I did some recent simulation on a similar Morel CAT378 waveguide. Not hard to recreate the impedance to 6 ohms with a parallel LCR with R=10 and a small 0.1mH coil for the lift in impedance at HF.
The series LCR came out as 10R/47uF/1mH. Good enough I think. An Fs notch is designed to prevent excursion and distortion at the Fs when using a single capacitor. That's how it works. Why do something less optimal? 😕
The Seas ER18DXT ported two way
I couldn't fathom why he uses an inaccurate Fs notch on the SEAS H1499-06 27TBCD/GB-DXT.
I totally get the bass filter with a notch slightly above 4.5 kHz: H1456-08 ER18RNX.
But the 1.5kHz Fs series tweeter notch is just plain wrong. It should be at about 800Hz on a resistor of about 8R. 😕
I did some recent simulation on a similar Morel CAT378 waveguide. Not hard to recreate the impedance to 6 ohms with a parallel LCR with R=10 and a small 0.1mH coil for the lift in impedance at HF.
The series LCR came out as 10R/47uF/1mH. Good enough I think. An Fs notch is designed to prevent excursion and distortion at the Fs when using a single capacitor. That's how it works. Why do something less optimal? 😕
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