Posted by mike.e [ 202.49.5.53 ] on August 24, 2004 at 23:54:50:
In Reply to: What makes a driver efficient? posted by Ralph on August 24, 2004 at 19:06:34:
Basically youl notice-
Home theatre subs are are inefficient
Small box subs are inefficient too.
Larger drivers tend to be more efficient
Lower Qts drivers are more efficient
Prosound 12"s and 15"s are efficient,they have higher Fs,Mid Q,and larger box requirements.
Efficient cone drivers are often Low Qts high BL(ie powerful and in control) fullranger units with added HF efforts.
II) Mid-Band, Reference Efficiency (%)
(Infinite Baffle Mounting Assumed)
[n0]
= ([p0]*[Bl]^2)/(2*[pi]*[c]*([Sd]^2)*[Re]*([Mas]^2))
= (4*([pi]^2)*([fs]^3)*[Vas])/(([c]^3)*[Qes])
Youl notice its fs^3 * vas.
Equations at the link
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