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-   -   car subwoofer filter 48 db/octave (http://www.diyaudio.com/forums/subwoofers/227173-car-subwoofer-filter-48-db-octave.html)

adytzu22 6th January 2013 08:16 PM

car subwoofer filter 48 db/octave
 
Hi could anyone please comment on the following circuit. Its an car subwoofer LP filter... tkx

http://static.diyaudio.com/forums/ga...medium/sch.png

http://static.diyaudio.com/forums/ga...a/1785/sch.png

djk 7th January 2013 12:19 PM

Too small to read.

adytzu22 7th January 2013 12:40 PM

LP
 
try this one... tkx

http://static.diyaudio.com/forums/ga...a/1785/sch.png

adytzu22 7th January 2013 10:27 PM

Car LP Filter.... Version 2
 
http://static.diyaudio.com/forums/ga..._LP_filter.png

any feedback wold be great ... tkx :D

http://static.diyaudio.com/forums/ga.../1785/plot.png

Moon Track 8th January 2013 09:22 AM

First: Iím unsure you are really need in doubled buffer for output.
Second. There will be strong crosstalk in input cable because of the link between input capacitors.
Third: Thereís no necessity to duplicate op-amps for direct and reversed signals.
It would be better to use one amp for mixer and next amp as inverter.
To switch phase it is enough to connect the filter input before or after inverter.
Fourth:
It is good practice, to minimize THD and to get maximal noise rejection ,to have direct and inverted inputs loaded by symmetrical current.
So, some of grounded inputs should contain resistors and some of resistors should be corrected.
For example:U7. The equivalent resistance at inverting input is paralleled R17||R18 -5kOhm, then to provide doubled current for U7 and U8 the R15 and R16 must be 5 kOhm too.

adytzu22 8th January 2013 07:01 PM

thx for the feedback
 
R15 & R16 ar a simulation of a 100K potentiometer because I couldn't find it in LTSpice... as for the input could you give me ani suggestion

is this better?

http://static.diyaudio.com/forums/ga...1785/input.png

:D

adytzu22 8th January 2013 08:55 PM

http://static.diyaudio.com/forums/ga...5/input_v2.png better?

adytzu22 8th January 2013 10:16 PM

version 3 LP filter 48 dB/octave
 
http://static.diyaudio.com/forums/ga...data/500/1.png


any feedback wold be greatly appreciated ... tkx ;)

d1030180 8th January 2013 10:21 PM

May I ask what is the purpose of resistors R1 and R4?

adytzu22 8th January 2013 10:24 PM

its just for simulating in LTSpice ... R1 and R4 are dummy-loads


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