help with driver specs

[simon5]

If your tweeter is an aluminium or titanium diaphragm, you could be hearing tweeter resonance.

What speakers are you using?

Also, the Audigy 2 is also a very poor performer that high in frequency. I don't know if SweepGen output in 44.1 kHz or 48 kHz. 48 kHz causes less problems that high in frequency with an Audigy 2.

The Creative X-Fi line corrected the problem with a beefy hardware resampling algorithm.

M-Audio Revolution line doesn't have this problem.

[michaelpage26]

Hi,
My tweeters are silk domes, Audio Pro Avantek Six Floorstanders...
But Audigy 2 was measured in some beanchmarks nearly flat till 19.5khz...Being -6db in 20khz doesn't mean it can buzz, right?
Anyway, I will try different cards and see...

[simon5]

Silk domes are supposed to be very "smooth" that high usually...

Yeah at -6 dB it should be less loud... trying another soundcard is probably the best idea. Try an X-Fi or a M-Audio Revolution...

Most soundcards have problems that high, except high-end soundcards.

[michaelpage26]

I found what will I do!
I will make a wav file with 20Hz and burn a cd. Then I will play it through Audigy 2/PC and then through my separate sony cs-player, to find out what is going on!
Thanks for the help though

[simon5]

Then try the same 20 kHz wav file, but record it at 48 kHz if you can and play it on your Audigy 2.

Audigy 2 is way better at 48 kHz than 44.1 kHz.

Good luck!

[michaelpage26]

Thanks for the advice!

I also have another question about Fs. Experienced people say that it is the point where driver impendance is maximum

I have noticed that its true with most drives, but I found out that it's not the case with this Excel woofer: http://www.seas.no/excel_line/excel/E0017.PDF

The impedance peak is at 60hz while the Free air resonance at 31Hz

What is wrong?

[richie00boy]

From the seas datasheet at top of graph:

The loudspeaker is mounted in a closed box of 12 l net. volume

So obviously resonance will be shifted up somewhat.

[michaelpage26]

Hm!
Well, Seas seems to be a little different compared to other companies that measure their drivers in free air, isn't it?
Does these measurements help a loudspeaker designer? I mean which one is preferable? (cabinet measuring or free air)

Regards,

Mike

[threegee]

Sorry owdi for not acknowledging your suggestion about WinISD.
It works great also.
Thanks!

[simon5]

Originally posted by michaelpage26
Hm!
Well, Seas seems to be a little different compared to other companies that measure their drivers in free air, isn't it?
Does these measurements help a loudspeaker designer? I mean which one is preferable? (cabinet measuring or free air)

Regards,

Mike

Well, you get the best of both worlds. Some people want to have free air resonance and some people want a typical impedance curve. Usually you use speakers in a box, so the impedance curve in a box is usually more useful.

They give both, free air and in box measurements. Good stuff.