Mid & Tweeter Mounted over Woofer? Anyone speak German and can explain this build to me?

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#41
If you play a sine wave through each at the same level, and they are in phase they should look the same.
gedlee said:
I simply don't see any relevance to the diaphragm mass as far as performance goes. We are talking about LF drivers here and their impulse response need not be that "fast" to be accurate. Even if "fast" were required, that's just a matter of increasing the force.

Sure, given air as the medium, the efficiency exchange (radiation efficiency)is greatest when the diaphragm mass density equals the air mass density, but it does this over an ever narrower bandwidth. What one usually wants is reasonable efficiency over a much wider bandwidth, meaning a much heavier cone. Add more force and you get what we all use now a heavy cone, big magnet woofer. Its HF performance is more dependent on how well the cone suppresses the rim resonance (surround), which is usually the first major cone breakup mode with any significant effect.
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#42
svp said:
My bet is that first impulse peak is faster on the typical tweeter than the woofer.
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You probably mean to say: I see an impulse response on my measurement display and it seems the response of the tweeter is ‘earlier’ than that of the woofer. Be aware that this is perfectly normal for low-passed systems with different cutoff frequencies (and the related -different- phase shifts) like tweeters and woofers. So what is your point?
 
#43
markbakk said:
You probably mean to say: I see an impulse response on my measurement display and it seems the response of the tweeter is ‘earlier’ than that of the woofer. Be aware that this is perfectly normal for low-passed systems with different cutoff frequencies (and the related -different- phase shifts) like tweeters and woofers. So what is your point?
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I run them as is, no electronic filters, no physical crossovers too. Just REW, audio interface for double duties, class D amp and wires straight to speaker driver. Coax driver, mic is in the same position.
My knowledge in audio is worse than in physics, and the relation of acceleration speed is very dependent on the mass of the object. In this case the mass of the woofer cone is bigger. And imo force required for acceleration and the accelerated mass relation is not linear. Will check that later.
If there is instruction of repeatable experiment to compare tweeter and woofer at the same freq - lets say 3kHz, I would like to do, but my google skills and my REW skills at this moment are not up to the task
 
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#44
Well, you can’t get an impulse response from a 3kHz sine steady state signal. Did you consider that an electrodynamic loudspeaker actually behaves like a bandpass filter?

Anyway, I don’t get what you’re pointing at. Acceleration relates to sound pressure for a given loudspeaker diaphragm size. And F=m.a, in Newtonian physics.
 
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#45
markbakk said:
Did you consider that an electrodynamic loudspeaker actually behaves like a bandpass filter?
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I absolutely get that (theoreticaly), but my point is about the result of that loudspeaker: if the typical tweeter and typical midrange gets to sine signal peak at the same time after signal is fed to them.

I googled formula after last post, but not sure if it is suitable when comparing low and high mass diaphragms.
 
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