Lowther cones or AER cones (Off Topic)

by GC, Friday, April 22, 2005, 01:14 (6916 days ago) @ GC

Thanks for your response Bert.

I believe that I saw a frequency response chart of an 8 ohm Lowther on an open baffle and the frequency response was increasing from the lower midrange to about 10 khz. I believe that the response was brought back to a flat response using an inductor. I figured that I would just avoid the inductor by creating a higher equivalent Qts. I can see what you mean by loosing some detail and dynamics with a higher equivalent Qts.

Either way, I would roll off the frequencies to the Lowther driver below 150 hz and have some woofers take over below that.

Well, replacing the voice coil was my primary excuse for doing a couple of things: getting rid of the Hi Ferric and getting better cones. However, if there is no primary reason to remove the cones to begin with, I may not go ahead and do that.

Retsel

Hi Retsel,

First, open baffle speakers are better off with higher Qts rating

drivers.

If I changes the drivers from the 15 ohm voice coils which I now have

to

one which is 4 ohms (driven by a SET amp on its 16 ohm tap or with a
higher output impedance transformer), I will get much closer to a more
appropriate Qts for the system. I can use high impedance speaker wire

as

well (i.e., 31 guage) to further raise the Qts. Does this all make
sense?


No sense at all. For more bass you need a higher Q driver, for quality
bass you still need a low Q driver (like the Quasar system). A Lowther or
AER in an open panel will not give any bass and will only start moving a
lot when the Q is made high (no control from the amp and even less when
you put resistance in series!!). If you want to kill the music then feel
free to increase the Q and add resistance...

If you use a bass driver in the open panel then the mid-high driver
(Lowther or AER) should be low Q-ed to keep some "live" unless you want to
go back to hi-fi....?

Ciao,

Bert

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