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Old 28th March 2007, 12:47 AM   #11
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I'm not sure if your looking for a project or a simple solution but here is what I used in my system, BEHRINGER CX2310 CROSSOVER, paid $64USD shipping included. It has 2 inputs & 5 outs, L&R high out, L&R low outs & a summed low pass mono sub out.
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Old 28th March 2007, 08:26 AM   #12
DorinD is offline DorinD  Romania
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Default Re: I need an active sub filter!

Quote:
Originally posted by hernanstafe
... Does anyone know a working, suitable ACTIVE filter? I've been looking for one on the net for quite some time but i can't find it

PS: I remind it should also sum up both channels.

Cheers!!
Yes Hernan, I know one. Mine. If you have some hands on electronics see here:

http://www.hi-fi.ro/fhifi/download.php?id=12620

or

http://www.hi-fi.ro/fhifi/viewtopic....r=asc&start=45

my "summing/crossing@70Hz/phasecontroll" device built with discret components on air. Cheers!
Dorin
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Old 28th March 2007, 05:16 PM   #13
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Quote:
Originally posted by hernanstafe
just wondering, what are those 3 opamps in the lower part of the schematic?

First one is a buffer, the second two make up the low-pass filter.

Seeing as how you are having numerous questions with this stuff, may I suggest taking it slow and working on understanding what is going on step by step. There are three or four threads with you asking similar questions, try to keep this to one thread so progress and previous question/answers can be tracked so someone isn't giving you the same answer or suggestion 4 times.


Circuits you might find anywhere on the web often leave out the power supply section, simply speficying +/- X Volts at some point on the schematic. They often leave out bypassing caps for the supply lines. These are normally understood to be needed / included. So if you ask someone "Is that all of the circuit", you'll probably get a "yes".

It sounds like you might want to find something predesigned and on a PCB with a BOM (Bill of Materials) that you can simply assemble. I'd suggest looking for this as a start, you'll more than likely have to spend some money buying the PCB/design.
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Old 2nd April 2007, 05:26 PM   #14
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Default active crossover

Hi,

you could try this one. The circuit was designed by some members of a German hifi-forum and me as active crossover for sub/sat systems with variable crossover frequency, either with pluggable resistors or a rotary switch. Gain is variable for sub- and sat-channels.
Moreover it offers summing of both channels for subwoofers or mono use, this can be configured with a jumper.

Voltage supply is included on the printed circuit board, only standard components are used. MKP condensors should be selected to ensure tolerances of at most 5%. Such types are also available at electronics distributors.

The whole thing is quite easy to build, costs are about 30$ without enclosure.

If interested, ask for further information.

Ciao Phil
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File Type: jpg schaltplan aktivweiche.jpg (78.0 KB, 477 views)
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Old 2nd April 2007, 07:27 PM   #15
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trip-pcs i'm really interested in that circuit it looks nice. The only thing i'd like to know is if there are any pcb layout available. Thanks for your help btw!!
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Old 2nd April 2007, 09:03 PM   #16
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Here is a great sounding crossover. Available as a bare board or kit. It includes an on board regulated power supply, which most kit types omit.

http://www.audio-kits.com/page/page/4071180.htm
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Old 2nd April 2007, 11:01 PM   #17
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Of course there is a pcb. I tried the circuit, it works well.
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Old 2nd April 2007, 11:01 PM   #18
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Unfortunately I can't upload files with high resolution here.

You get all information needed in a zip-file here:

http://www.file-upload.net/download-...eiche.zip.html

A picture of my design can be found below...
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File Type: jpg aufbau aktivweiche1.jpg (37.9 KB, 401 views)
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Old 4th December 2007, 09:32 PM   #19
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After a long time of not working on this (because i was busy with college) i'm going to keep working on my amp/pream projects. I'm going to build trip-pcs filter, but i'd like to know if you could help me understand what you sent me since i really don't understand that language!!
Thanks in advance
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