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Old 6th January 2013, 08:16 PM   #1
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Default car subwoofer filter 48 db/octave

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

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Last edited by adytzu22; 7th January 2013 at 12:49 PM.
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Old 7th January 2013, 12:19 PM   #2
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Old 7th January 2013, 12:40 PM   #3
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Default LP

try this one... tkx

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Old 7th January 2013, 10:27 PM   #4
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Default Car LP Filter.... Version 2

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any feedback wold be great ... tkx

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Old 8th January 2013, 09:22 AM   #5
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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.
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Old 8th January 2013, 07:01 PM   #6
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Default 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?

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Old 8th January 2013, 08:55 PM   #7
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Click the image to open in full size. better?
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Old 8th January 2013, 10:16 PM   #8
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Default version 3 LP filter 48 dB/octave

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any feedback wold be greatly appreciated ... tkx
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Old 8th January 2013, 10:21 PM   #9
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May I ask what is the purpose of resistors R1 and R4?
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Old 8th January 2013, 10:24 PM   #10
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its just for simulating in LTSpice ... R1 and R4 are dummy-loads
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