There is a French document about this and other full range related myths. In two words, they say you will just loose efficiency, but the Fr will remain the same as the maximal HF extension is function of the coil inductance and not of the mass load. Of course Fs will go down.
Fair enough in theory.
In theory a 4" cone can only go up to about 3400hz before output drops. Of course, we know this isn't true. Mostly due to the cone not being a theoretical , perfect piston. The cone breaks up, different sections behave differently at different frequencies, the dustcap can have a pronounced effect on the high frquency response depending on it's shape and make.
Adding mass to a full range driver will certainly change the behaviour of the cone and it's break up nodes. Depending on how the mass is added , the change in frequency response could be subtle or drastic.
If I had a 4" driver and added enough clay, putty, silicone, glue, or whatever all over the surface of the cone, to reduce the drivers Fs from 80hz to 50hz , do you think the mid and high frequency response would be the same as a stock driver (just reduced in spl) ?
.......................Blake
In theory a 4" cone can only go up to about 3400hz before output drops. Of course, we know this isn't true. Mostly due to the cone not being a theoretical , perfect piston. The cone breaks up, different sections behave differently at different frequencies, the dustcap can have a pronounced effect on the high frquency response depending on it's shape and make.
Adding mass to a full range driver will certainly change the behaviour of the cone and it's break up nodes. Depending on how the mass is added , the change in frequency response could be subtle or drastic.
If I had a 4" driver and added enough clay, putty, silicone, glue, or whatever all over the surface of the cone, to reduce the drivers Fs from 80hz to 50hz , do you think the mid and high frequency response would be the same as a stock driver (just reduced in spl) ?
.......................Blake
The French Paper of which you spoke :
Google Translate
The translation isn't so good, but it is better than my French
..........................Blake
Google Translate
The translation isn't so good, but it is better than my French
..........................Blake
I skimmed the French paper, and assume when they discuss fullranges they are including whizzer cones. Those would be separate from a cone-they are making their own kind of acoustic.
There is absolutely a moving mass rolloff...in horn systems (per D.B. Keele). I can't say it applies for sure otherwise, although it seems like it should.
And in real life, whatever goop you put on to drop the resonance a lot will probably absorb HF energy and cause more rolloff.
There is absolutely a moving mass rolloff...in horn systems (per D.B. Keele). I can't say it applies for sure otherwise, although it seems like it should.
And in real life, whatever goop you put on to drop the resonance a lot will probably absorb HF energy and cause more rolloff.
That seems to be coming into it......However the original question
(in my mind) was the effect of the added weight only.
Hammer Dynamics Super 12 (Page 3) / FullRangeDriver Forum / Fullrangedriver Forum
..................Blake
..................Blake
Thread was split to try and keep it on target, here is where the Mass vs High Frequency Rollof debate is now Does adding mass to a driver affect the high frequency response ? (Page 1) / FullRangeDriver Forum / Fullrangedriver Forum
Thanks.......................Blake
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