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Old 25th November 2012, 06:50 PM   #21
KSTR is offline KSTR  Germany
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PD1550 is a very OK driver but has a low Xmech (older design motor) and tends to bottom out the VC when overdriven. Adding mass would make the issue even more severe.

Why not just EQ it, that's more elegant than throwing away motor force. You'd need some voltage headroom of the amp to overcome the back-EMF so a class-D type is best suited in terms of total true efficiency which is much higher than when loaded down with additional mass.

Last edited by KSTR; 25th November 2012 at 06:53 PM.
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Old 26th November 2012, 10:51 AM   #22
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by KSTR View Post
PD1550 is a very OK driver but has a low Xmech ......

Why not just EQ it, that's more elegant.....
bottoms at 22mm
PA disco, or quality hihi ?

why is EQ more elegant
isnt it just spoiling the Q electrically ?

but you are right
it should to be considered carefully
I might prefer adding mass to the PD186
would result in very low Fs, and a Qts suited for closed design
has more Xmax, and its a better size
and for low bass I would suggest a heavier and more sturdy cone anyway
higher Qts should not be any problem at all with my preferred SPL(low)
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