I thought that the whizzer cone/ dust cap was rigidly fixed to the voice coil, but the main cone was connected to this assembly via a black rubbery compound, so that the whizzer cone could respond more freely to higher frequency signals without having the influence of the additional mass of the main cone to contend with.
Wouldn't filling this area stiffen this flexible coupling and modify the frequency response of the assembly? (de-sensitise the whizzer)
Correct me if this is not the case for these fostex drivers, as I only read this somewhere, and it may have been another type of driver.
I made some phase plugs for my Fostex drivers. My friend is working with digital programable milling mashines and he did these for me out of aluminium. This is the first one. I want to try a couple of sheapes. There are much more highs and the sound is crystal clear with these fitted. Imaging and low level detail improved and the speakers are more smooth and relaxed. I will report how does it compare to diffrent shapes I'm going to try (maybe I will set a new thread about it). These are 33mm but it seems like 34mm would also fit. The height is 55mm.
Bartek
Bartek
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I don't know if it's optimized. I will try a couple of diffrent shapes and will see which one I like better. I can't do any measurements becouse of lack of instruments, I will be examinating them only with my ears. The shape is straight 33mm untill some 2mm above the base of the whizzer.
I personally have no idea, but I don't think it should be much longer than Whizzer.
Bartek
No, I think he's right...all of my 'whizzered' Fostex drivers were assembled that way, except the Fe166es-r, that one has stiffer, red goo instead of black. The Jordans I've seen don't have a whizzer, instead they use a flexy foil cone, the science behind that is described on T.J.'s web page.
Hey Dave,
Hey Dave,
Because you have designed and experimented with phase plugs and, as I understand, did some extended listening to Visaton B200's, you may be in a unique position to speculate on a question I have.
Do you think phase plugs would improve the HF response of the B200's? I'm thinking of the off axis dips in the 5k to 10k range (and above) on some response graphs I've seen. Or might the phase plugs(and dustcap-ectomy) risk loosing some of the HF extension?
Also, while you had the B200's did you run them past any of your test equipment(Fuzzmeasure)?
Thanks,
scottw
Hey Dave,
Because you have designed and experimented with phase plugs and, as I understand, did some extended listening to Visaton B200's, you may be in a unique position to speculate on a question I have.
Do you think phase plugs would improve the HF response of the B200's? I'm thinking of the off axis dips in the 5k to 10k range (and above) on some response graphs I've seen. Or might the phase plugs(and dustcap-ectomy) risk loosing some of the HF extension?
Also, while you had the B200's did you run them past any of your test equipment(Fuzzmeasure)?
Thanks,
scottw
Re: Hey Dave,
My (untested) opion is that phase plugs on these would make quite the improvement (based on general results from every other speaker we have done). I've had lots of inquiries, but no one has decided to take the plunge yet. I'm not at the moment in a position to buy a set and do the experiemnts myself.
At least here in NA, the B200 is an excellent driver that is still flying under the radar of most people.
They were BFM (before fuzzmeasure).
dave
scottw said:
My (untested) opion is that phase plugs on these would make quite the improvement (based on general results from every other speaker we have done). I've had lots of inquiries, but no one has decided to take the plunge yet. I'm not at the moment in a position to buy a set and do the experiemnts myself.
At least here in NA, the B200 is an excellent driver that is still flying under the radar of most people.
They were BFM (before fuzzmeasure).
dave
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