Kalman Rubinson wrote:

On Sat, 13 Jan 2007 00:13:08 +0000, Eiron wrote:


Kalman Rubinson wrote:


Posts like this do not deserve any response but, in the small
possibility that someone takes him seriously, I will add that there
are several powered subwoofers which
(1)take speaker-level inputs,
(2)have a passive speaker-level crossover,
(3)feed the high-pass output to terminals for the left/right speakers
and,
(4)via a resistive network, pass the LP output to the built-in power
amp and subwoofer driver.

I think you will find that they
1) take speaker-level inputs
2) which are directly connected to terminals for the left/right speakers
3) via a resistive network, combine L+R and feed it to an electronic
LP filter and thence to the built-in power amp and subwoofer driver.

Please feel free to give an example of one that works your way.


I take your correction for point #3 which is functionally equivalent.
As for point #4, see
http://www.definitivetech.com/specs/...ml#poweredsubs
for an example.

Thanks for the example. First one I've seen.
That one does feed the speakers via a first order HP crossover,
or in other words, through a capacitor. The turnover frequency varies
according to your speakers, their impedance and Q of any bass resonances
and the tolerance of the capacitor.
A bit of a lottery really.

--
Eiron.