Stewart Pinkerton wrote:



Nope. If you look at the volume of air you need to shift at 20Hz to
obtain even 100dB (not a particularly loud peak level), then you need
a *lot* of power! This is why decent commercial subs invariably have
several hundred watt amps, some go up to a kilowatt!.


Can I have a little rant?

This thread was about KEF B139s.

If you look at a B139, not with rose-tinted glasses,
but as the woofer in a domestic hi-fi setup, it is excellent.

Maybe it doesn't work as an AV sub to reproduce helicopters
and explosions at window shattering levels but in a reflex box
with -3dB at ~32 Hz or a TL with -10dB at ~20Hz it sounds
pretty damn' good on all of my CDs and vinyl.

What's more, a B139 still works after 30 years, unlike foam-surround
woofers that are dead at 10 years or other newish materials that lose
their shape and fall off (some sort of Goodmans loudspeaker)

So I may buy new speakers, but KEFs will be playing at my funeral. :-)

Thanks,

Roger.