Subsonic filter options - Page 2

Jimmy154 · 9th March 2010, 06:28 PM

Quote:

Originally Posted by richie00boy

A split supply is one that has positive and negative power rails as well as ground/0V. You could look at project95 on the ESP website.

Can I use this split power supply in it's current configuration and values with a 12-15V car power supply?:

Artie · 07:07 PM

The chip data sheet says its good up to 18-volt output, but you'ld need to up a couple of those cap values. Honestly, I don't think I'd mess with this method if you don't have a little more electronics experience. I haven't even tried it myself yet.

If you can live with a simple 1st order filter, why not just do as they show here:High-pass filter - Wikipedia, the free encyclopedia

That will give you -6db / oct.

Jimmy154 · 9th March 2010, 10:51 PM

Yes, I read the chip specs, that it had an output of 3-18V. I thought, with my limited electrical knowledge, that I need higher Cap values for higher output, but didn't know what value and what else needed to be changed.

I guess I will go with this 12 db/octave filter: Passive Line-Level Crossover once I figure out my amp's input impedance. I am waiting from a response from Boston Acoustics, since I don't know of an easy way to measure this spec.

Jimmy154 · 10th March 2010, 01:49 AM

Can I adjust the Q of the passive line level crossovers to a Q of 1 or more? Change the equations a little perhaps?

Passive Line-Level Crossover

Jimmy154 · 02:30 AM

Quote:

Originally Posted by richie00boy

A split supply is one that has positive and negative power rails as well as ground/0V. You could look at project95 on the ESP website.

Project95 creates a -12V and ground and the +12V input to this circuit would also act as an input to the project99 circuit? Then all I would have to do is limit the current to this circuit (or both circuits?) from my car wiring with some resistor(s)?

richie00boy · 10th March 2010, 06:24 PM

No just build P95 and P99 as they are. You would do well to read some of the basics on the ESP site as well.

Jimmy154 · 10th March 2010, 06:56 PM

Quote:

Originally Posted by Jimmy154

Can I adjust the Q of the passive line level crossovers to a Q of 1 or more? Change the equations a little perhaps?

Passive Line-Level Crossover

I will try for the active filter if my friend really wants that option. Does any one know how to tweak the passive filter so the Q is 1 or higher?

richie00boy · 10th March 2010, 07:33 PM

You can't get high Q with a passive filter unless you go to using inductors as well which I think is beyond your level.

Jimmy154 · 11th March 2010, 02:30 PM

I just realized I don't know what kind of capacitors or resistors to use in this circuit: Passive Line-Level Crossover

Jimmy154 · 11th March 2010, 10:30 PM

I just realized I could probably look that up

9th March 2010, 07:03 PM	#12
Artie diyAudio Member Join Date: Jul 2007	The chip data sheet says its good up to 18-volt output, but you'ld need to up a couple of those cap values. Honestly, I don't think I'd mess with this method if you don't have a little more electronics experience. I haven't even tried it myself yet. If you can live with a simple 1st order filter, why not just do as they show here:High-pass filter - Wikipedia, the free encyclopedia That will give you -6db / oct. Last edited by Artie; 9th March 2010 at 07:07 PM.

9th March 2010, 10:51 PM	#13
Jimmy154 diyAudio Member Join Date: Jun 2002 Location: Los Angeles	Yes, I read the chip specs, that it had an output of 3-18V. I thought, with my limited electrical knowledge, that I need higher Cap values for higher output, but didn't know what value and what else needed to be changed. I guess I will go with this 12 db/octave filter: Passive Line-Level Crossover once I figure out my amp's input impedance. I am waiting from a response from Boston Acoustics, since I don't know of an easy way to measure this spec. __________________ We do not allow political statements or conjecture to be made on these forums.---the diyAudio moderation team

10th March 2010, 01:49 AM	#14
Jimmy154 diyAudio Member Join Date: Jun 2002 Location: Los Angeles	Can I adjust the Q of the passive line level crossovers to a Q of 1 or more? Change the equations a little perhaps? Passive Line-Level Crossover __________________ We do not allow political statements or conjecture to be made on these forums.---the diyAudio moderation team

10th March 2010, 06:24 PM	#16
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	No just build P95 and P99 as they are. You would do well to read some of the basics on the ESP site as well. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

10th March 2010, 07:33 PM	#18
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	You can't get high Q with a passive filter unless you go to using inductors as well which I think is beyond your level. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more


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11th March 2010, 02:30 PM	#19
Jimmy154 diyAudio Member Join Date: Jun 2002 Location: Los Angeles	I just realized I don't know what kind of capacitors or resistors to use in this circuit: Passive Line-Level Crossover __________________ We do not allow political statements or conjecture to be made on these forums.---the diyAudio moderation team

11th March 2010, 10:30 PM	#20
Jimmy154 diyAudio Member Join Date: Jun 2002 Location: Los Angeles	I just realized I could probably look that up __________________ We do not allow political statements or conjecture to be made on these forums.---the diyAudio moderation team

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