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In Reply to: RE: Monacor DT-350NF posted by Awe-d-o-file on August 06, 2016 at 06:33:23
Get a third tweeter and see if you get "three" different FR above 8khz. Chances are you will. As much as we would like to think it wouldn't happen each driver will be a tad different.
Get the third and measure it. I would like to see if it matches one or is different from the original two.
Also how old are you. If you're over 50 the point is quite academic.
Charles
Follow Ups:
First Im 57, used be a board certified hearing instrument specialist and can still hear to 15K. Second I am not the OP. I dont have the tweeters! Did you read the manufacturers page yet where it says the tweeter can be used to 1.5K with a third order crossover?I said it before and will say it again, the graph in the originsl post was made by the op not the manufacturer and with the tweeter he bought. The response being fucked up below three k is the whole point of the thread! This is my last attempt to get you to understand.
Both of you have responded to my posts as if you are talking to each other not to me. It seems English is a second language to the op, whats your excuse?
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Edits: 08/06/16
Awe-d-o-file..
You still missing the whole point of the thread..
You have frequency response of tweeter without xover in post 5, and you have schematic of xover which is used for measurements in first post..
Drivers are usable from 1k5, but with different (biger) coils, and probably caps too.. they also need front panel..
Again, whole point of the thread is unacceptable difference between two drivers on higher frequencies..
Conclusion that tweeters can't bu used bellow 3k is wrong..
I dont know who made the graph but that tweeter is 20db down @1500 and would really suck below 2700. The differences in the high frequency end pale in comparison. That tweeter shouldnt be used below 2700 even though their site says it can be used to 2k with a second order/ 12db per octave or 1500 with a third order 18 db per octave crossover. BULLSHIT!!
Reread your original post. You show a response graph and no other information about the graph. Im done responding to you. You can tell everyone else why the 3-5 db difference in response from 2.7k to 20k is worse than the 20 db difference between 1.5k and 2.7 k. You realize how stupid that sounds and more importantly actually is I hope......but I doubt it. Good luck.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
I dont know who made the graph but that tweeter is 20db down @1500 and would really suck below 2700. The differences in the high frequency end pale in comparison. That tweeter shouldnt be used below 2700 even though their site says it can be used to 2k with a second order/ 12db per octave or 1500 with a third order 18 db per octave crossover. BULLSHIT!!
Reread your original post. You show a response graph and no other information about the graph. Im done responding to you. You can tell everyone else why the 3-5 db difference in response from 2.7k to 20k is worse than the 20 db difference between 1.5k and 2.7 k. You realize how stupid that sounds and more importantly actually is I hope......but I doubt it. Good luck.
The first measurement you keep picking at was made WITH THE CROSSOVER
NOT THE BARE DRIVER
vulejov has tried to explain this to you MULTIPLE TIMES
He posted the crossover circuit
He posted measurements with and without the crossover
Still you don't seem to get it
Thanks Dave
I haven't been much help myself only to see if he get's variable results using other tweeters as well. My be an inherent design problem.
Just asking:
Did you do the measurements with the SAME crossover. What I am getting at is if you are using two crossovers you could have a crappy capacitor on one channel causing the difference????
Me - I'm stupid.
Na I just read this stuff in the morning. I guess I should be more awake if I'm gonna respond. Sorry.
charles
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