Brad, as a point of reference, please - are all of these drivers/measurements [on your baffle] performed after or before some sort of break-in period? [That CX10 3rd & 5th HD plot is blowing my mind because I have a pair here crossed at 95 Hz HP and 2670 LP w/MiniDSP 4X10HD and they sound great - so I am really questioning my understanding of odd order HD at this point] . . .
All measurements are measured on an IEC baffle at 1m and 2.83v.
As for this, beta 10 CX it’s about four or five years old I don’t think it has much time on it but there ain’t much to break it on it as suspension is very loose anyway.
@4thtry said:
Interesting comparison. So if you mounted them diagonally, would you then get a set of compromise plots with curves roughly half way between the H and V curves?
Just use a round 7" driver - it will look better . . .
@Steve_Lee said:
Brad, as a point of reference, please - are all of these drivers/measurements [on your baffle] performed after or before some sort of break-in period? [That CX10 3rd & 5th HD plot is blowing my mind because I have a pair here crossed at 95 Hz HP and 2670 LP w/MiniDSP 4X10HD and they sound great - so I am really questioning my understanding of odd order HD at this point] . . .
Thanks!
I wouldn't sweat it honestly, as the 3rd order is -40dB. Even though it is 3rd dominant, the level is decently suppressed.
Nick made the revelation after building Pass's HD injector that a little still isn't acknowledgeable. He could tell you more about it....
I may test it out in the next while, as I have some drivers that manage -70dB or better H3. I can say that -40dB H2 may be perfectly acceptable, -40dB H3 however is "easily audible" just listening to a sine sweep. For myself, -40dB H3 would be more of a "is it broken" threshold, set the bar a bit higher (err...lower) for something I would consider a hifi driver.
@dcibel said:
Generating a single harmonic through analog means without contaminating other aspects of the signal will be a challenge.
I've heard Nelson Pass knows some stuff, he probably figured it out okay.
Yes, we should never question what those smart people say and search for validation, they're always right... But I suppose for $8 and some spare parts I can build the simple JFET circuit and see for myself...but I'll probably use the digital method. 5 min of search leads me to believe the H2 generator provides "dominant 2nd order" in a tube amp sort of sense. Besides the point anyway, which was 1% H2, not H3.
That's unfortunate, did they forget to put stuffing in the chamber? I'd disassemble that one and try to fix it. Why does a tweeter need such a huge rear chamber?
Not sure what to think about this statement, but the best tweeter on my shelf is AliExpress off-brand "Melodavid" Be28. I'm not convinced it's really a Be tweeter, more likely Al or Ti with ceramic coating, but it performs well enough that I'm not sure I care that much. It looks nice and performs well, what more can you ask for?
Tested at 2.8V. I did crank it +5dB to ~5V, no change.
Filtered for 2kHz LR4, 3rd order is all but non-existent. This one is truly competitive with the top end "name brand" tweeters!
Comments
Correct.
I dropped off a few drivers today, including a pair of those Arylic AMT tweeters. Curious to see if there is any unit to unit consistency.
Where is that popcorn emoji.....
Eminence Beta10cx
EminenceASD1001 CD in Beta10cx
Brad, as a point of reference, please - are all of these drivers/measurements [on your baffle] performed after or before some sort of break-in period? [That CX10 3rd & 5th HD plot is blowing my mind because I have a pair here crossed at 95 Hz HP and 2670 LP w/MiniDSP 4X10HD and they sound great - so I am really questioning my understanding of odd order HD at this point] . . .
Thanks!
All measurements are measured on an IEC baffle at 1m and 2.83v.
As for this, beta 10 CX it’s about four or five years old I don’t think it has much time on it but there ain’t much to break it on it as suspension is very loose anyway.
Just use a round 7" driver - it will look better . . .
Dynavox LW6004PMR-N (new style).
Awesome to see there is no functional difference between old and new models of the Dynavox.
I wouldn't sweat it honestly, as the 3rd order is -40dB. Even though it is 3rd dominant, the level is decently suppressed.
Nick made the revelation after building Pass's HD injector that a little still isn't acknowledgeable. He could tell you more about it....
InDIYana Event Website
Wolfy's Photobucket
Which drivers can't manage -40dB H3 at 2.8V?
I'm looking for Pass HD injector, finding only H2 injector, where is H3?
SB-25CD-P in Dayton 6.5x12” modified horn.
Acrylic AMT-7
No matter what capacitor I used nothing changed much. So went easy on them.
This compares driver 1 to driver 2 at all different axis.
That HD injector I think was H2 based.
Do you have a SEOS-8 to test the SB 25D Bianco in?
Generating a single harmonic through analog means without contaminating other aspects of the signal will be a challenge. This type of comparison is best achieved in digital domain , here's a plugin for Audacity that may be a good tool to use:
https://www.softpedia.com/get/Multimedia/Audio/Audio-Plugins/Harmonic-Generator.shtml
I may test it out in the next while, as I have some drivers that manage -70dB or better H3. I can say that -40dB H2 may be perfectly acceptable, -40dB H3 however is "easily audible" just listening to a sine sweep. For myself, -40dB H3 would be more of a "is it broken" threshold, set the bar a bit higher (err...lower) for something I would consider a hifi driver.
I've heard Nelson Pass knows some stuff, he probably figured it out okay.
I have a SEO8 but that is not a 1” opening it’s a 1.5”
Yes, we should never question what those smart people say and search for validation, they're always right... But I suppose for $8 and some spare parts I can build the simple JFET circuit and see for myself...but I'll probably use the digital method. 5 min of search leads me to believe the H2 generator provides "dominant 2nd order" in a tube amp sort of sense. Besides the point anyway, which was 1% H2, not H3.
^ I agree - it is best to experiment and decide for one's own self - the lesson sticks much more firmly this way.
Seems testing to only 20khz might not quite give enough HD info for tweeters that would be crossed high. Or does it not matter much that high?
Can you hear beyond 20kHz?
Well, those AMT measure better response-wise than I was expecting but distortion is pretty disappointing. Wonder what to do with them.
Do you want me to post that metal dome tweeter you gave me?
Yessir
Molisio MO-2308
I had high hopes for this one, by the look of the FR I was hoping it would have “stepped it up “.
On the other hand, distortion isn't the worst.
Cross it around 3K or maybe a touch lower, and it's completely usable.
That's unfortunate, did they forget to put stuffing in the chamber? I'd disassemble that one and try to fix it. Why does a tweeter need such a huge rear chamber?
Not sure what to think about this statement, but the best tweeter on my shelf is AliExpress off-brand "Melodavid" Be28. I'm not convinced it's really a Be tweeter, more likely Al or Ti with ceramic coating, but it performs well enough that I'm not sure I care that much. It looks nice and performs well, what more can you ask for?
Tested at 2.8V. I did crank it +5dB to ~5V, no change.
Filtered for 2kHz LR4, 3rd order is all but non-existent. This one is truly competitive with the top end "name brand" tweeters!
