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Old 5th December 2009, 02:14 AM   #1
diyAudio Member
Join Date: Mar 2008
Location: Sunny Seattle
Default pllxo w lm3886?

Hi all,

I am hoping to implement a passive line level xo like the one shown here: Passive High-Level Crossover
to drive 2 pretty basic lm3886 amps. 2nd order cross at around 80hz. I am not using an active preamp, just a 50k stepped attenuator. Will this combo work? Work well? Do I need to run an active pre?
Any help is appreciated,

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Old 5th December 2009, 12:15 PM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
you cannot get a 2pole from a passive circuit unless you combine capacitors and inductors.

You can get 1pole from passive using R+C or L+C.
The R+C is usually adopted.
For the passive filter to work correctly, it must be fed from a zero ohm source impedance and it must feed into an infinite load impedance.
That Rsource and Rload requirement demands some active stages.
Decide if you want passive + active stages or go straight to active filter.
regards Andrew T.
Sent from my desktop computer using a keyboard
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