Speaker Asylum

RE: Are you as deranged as your posts suggest?

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This Post Has Been Edited by the Author

In Reply to: RE: Are you as deranged as your posts suggest? posted by villastrangiato on July 12, 2012 at 08:19:59

Hi,

> Are you as deranged as your posts suggest?
>
> Or are you just one complete non stop joke?

Well someone here clearly is.

I have no particular agenda (e.g. I do not own a warehouse full of NOS D130 and 075 which I am trying to talk up in value - I wish I did though).

I merely use them as an illustration that most "truisms" and generalisations (such as "A 15 Driver must be crossed over below XXXHz" or "A 5" Mid bass is the best in all time") are in fact completely false.

Now I should note that I am not suggesting to generalise from concrete examples (e.g. the D130 & 075 crossed at 5KHz), so for example a Car Audio 15" "Competition" Subwoofer Driver most certainly would not be suitable to a two system crossed over at 5KHz, yet it is possible to make such system GIVEN THE RIGHT DRIVERS AND ENGINEERING.

I notice that you omitted to answer my question if you actually measured such a system (especially DI) as I described (that is very precisely the JBL D130 and the JBL 075 crossoed over at around 5KHz)?

Have you? (I have, BTW).

And if you have not measured it, how can you claim to know what it measures like?

And it would seem you have also omitted to peruse the specifications issued by JBL for these drivers either (which may prove illuminating, FWIW).

> Everything you just posted was a repeat of what I've been saying.

Actually posted a list of speaker references where the highest crossover was 400Hz for 8" Woofers, which did not include a single 15" (FWIW) and with which you suggested that was some general technical consensus or some such that large drivers must be crossed over low (below 400Hz, which you suggest should be the maximum for an 8"Driver in your post).

I pointed out that very successful designs exists that do not follow these rules and in fact cross over very large drivers quite high, compared to your examples.

Now the JBL D130 I have been consistently referencing is a wideband 15" that does operate up to 6KHz quite successfully (the old EV SP-15 and the Goodmans Axiom 401 also did quite well, all said, but their Cone/Whizzer design kind of played havoc with the directivity and frequency response) and I did not suggest that any other drivers where suitable to such a design.

The D130 of course has narrow dispersion at higher frequencies, which is why the competent Engineers at JBL elected to mate it with an equally narrow dispersion tweeter, so the directivity index for the complete system is both very high (in other words it creates very little room reverb) and quite even from the midrange and up.

You may very well debate with me if a high and slow change/constant directivity index is a good thing for music reproduction or not, that I would suggest is a matter of taste. Some people like Bose 901's, some like MBL Omni's, some like very narrow dispersion systems instead.

Let them all eat cake.

Ciao T
Sometimes I'd like to be the water
sometimes shallow, sometimes wild.
Born high in the mountains,
even the seas would be mine.

(Translated from the song "Aus der ferne" by City)

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