filter values (BD-Design)

by GC, Monday, August 29, 2005, 17:28 (6815 days ago) @ GC

I am working with this Second Order Low Pass filter but I overlap the 'reference' BD15s with Hedlunds so figures are not really relevant to you.
This is my take on tuning the filter - I'm sure Bert will correct any errors as I am no expert.

Have a look at this link http://www.t-linespeakers.org/tech/filters/passiveHLxo.html

Turning to the Second Order Lowpass filter, construct this with the values that Bert supplies. The first R1/C1 section gives you the notional crossover frequency. Mine with 1K2 and 2.7uF calculates at about 50Hz. Leave R1 alone and adjust C1. Highering C1 lowers the frequency.

Now move to the second stage where R2 and C2 set the filter slope which is the amount of overlap with the FR driver. Leave R2 alone and adjust C2. Highering C2 lowers the overlap.

Hope this helps to clarify.

Cheers Chris

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filter values - GC, 2005-08-25, 23:10
- filter values - GC, 2005-08-28, 10:07
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    - filter values - GC, 2005-08-28, 19:17
- filter values - GC, 2005-08-29, 11:23
  - filter values - GC, 2005-08-29, 17:02
    - filter values - GC, 2005-08-29, 17:28
      - why not 3rd LPF order? - GC, 2005-08-30, 01:48
        why not 3rd LPF order? - GC, 2005-08-30, 08:11
        why not 3rd LPF order? - GC, 2005-08-30, 22:10
        
        Some more info... - GC, 2005-08-31, 00:06
- filter values - GC, 2005-09-02, 16:41