martijn86
Active Member
LOL the engineer just pissed in the snow and said:"Here's your graph! I quit!"
The green circle I've drawn is the tweeter's step. The blue circle could be some very odd tweeter behaviour, but it's extremely likely it's the beginning of the woofer's step (which of course peaks after the tweeter's step, but which IMO almost certainly begins 0.2ms before it):
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That will be the last I labour this point
Sure, I was talking about low pass filters making the woofer slope more gradual. Also, I'm not sure, but higher order filters add some kind of delay to the step response, right?
Yep, the waveguide is the key, we can see the tweeter's diaphragm is a few cm behind the deepest point of woofer cone. The delay is about 110us which corresponds to 3.8cm which looks just about right.How did you determine that the first dip is the woofer and not a tweeter in opposite polarity? Based on the fact that the tweeter is in a deep waveguide? Now that you mentioned the waveguide, your and @andreasmaaan 's suggestion makes more sense than mine. I was originally thinking of something like this
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You should probably start a thread asking for help, hopefully someone local to you is able to help, or is there a local shop you could cut a deal with?Ok, I ordered one. What the heck I am going to do with these speakers...I have no idea....
I don't think that's the case at all. Some foks who own them might do it for the nostalgia. Others hear them and say they sound unboxy and lifelike, more so than the typical box speaker. In one of the JBL threads the 'voiced or formatted sound' was discussed and I commented:Klipschorns and La Scalas are ancient designs kept around as novelties. Their charm isn't fidelity, it's being ancient.
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Still leaves me wondering why the RP-600m with similar driver offset behaves differently
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Yardsale, fleamarket, or donate to charity sales.Ok, I ordered one. What the heck I am going to do with these speakers...I have no idea....
But the RP-600m has a deeper waveguideIt's larger woofer has an acoustic centre that is deeper, and therefore further from the microphone, than the 4" woofer in the R-41m.
I'm only looking at which driver arrives first rngr-e - look what happens right aften 4ms, there's the hickup. Just different x-axis scale and most likely measured at longer distance.
Or an ASR essay contest: "Why I dislike these speakers more than any other speaker on the market!" The winner gets the pair, from here on out able to live in eternal sonic agony!Yardsale, fleamarket, or donate to charity sales.
But the RP-600m has a deeper waveguide
Still leaves me wondering why the RP-600m with similar driver offset behaves differently
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Their conclusion "the tweeter's step has begun to decay..." is plain wrong, for the reasons mentioned. The assumption that the speaker's main lobe is tilted downward is most probaly invalid. One simply cannot infer such info from a step reponse, you either need to have vertical polars or individual mag/phase responses of the drivers.Still leaves me wondering why the RP-600m with similar driver offset behaves differently
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Reverse engineering detected!