How difficult would it be to make to a quality sub crossover with variable frequency cutoff, variable gain/output, and finely variable phase?
I have a Paradigm x-30 that is great, but it takes line-level inputs & only provides summed mono output.
I'd prefer to maintain true L/R stereo output and speaker-level inputs. Line-level RCA won't work for my new setup because my preamp(TVC) is a 40 ft balanced cable run from my monoblock amps next to my speakers.
Any suggestions or websites with schematics?
I have a Paradigm x-30 that is great, but it takes line-level inputs & only provides summed mono output.
I'd prefer to maintain true L/R stereo output and speaker-level inputs. Line-level RCA won't work for my new setup because my preamp(TVC) is a 40 ft balanced cable run from my monoblock amps next to my speakers.
Any suggestions or websites with schematics?
Not so difficult.
http://www.sound.westhost.com/
"78 3-Way 12dB/ Octave Crossover "
Buffers, HPF/LPF.Simple
For fancy stuff youl need more knowledge.
Speaker level inputs = Voltage dividers.
I have a schematic from Electronics world which has variable phase + filtering for a servo sub.
http://www.sound.westhost.com/
"78 3-Way 12dB/ Octave Crossover "
Buffers, HPF/LPF.Simple
For fancy stuff youl need more knowledge.
Speaker level inputs = Voltage dividers.
I have a schematic from Electronics world which has variable phase + filtering for a servo sub.
Thanks for reminding me about Elliot Sounds, I should thought of that myself. Rod's got a solution for just about everything there.
I probably should have given more information about my particular system. I've got 97dB Cain & Cain Double-Horn IM-Ben (1/2 way down page) speakers which run their Fostex FE-168 Sigma 6.5" fullrange w/o x-over & T900A supertweeter nearly fullrange with adjustable, second order 12 db per octave x-over @16.5khz on the super tweeter.
The speaker's overall frequency response is ~40-35kHz.
For subwoofers, I have a pair C&C's passive Baileys . Terry Cain, the designer/manufacturer, suggest crossing the Baileys in at somewhere around 80Hz, adjusting for room specifics.
So, I won't need the high pass portion of a crossover, just the LP. I'd prefer to keep the FE-168 free from any x-over.
How about the 24dB 24 dB/Octave 2/3-Way Linkwitz-Riley ?
I'm just guessing that the steeper 24dB slope would perform better. Is this true?
Hmmmm. For the short term, I could make a little voltage dropping unit to plug into the inputs of my paradigm X-30.
Do you have any idea what the ratio would be? Or, what the likely voltage output at an amplifiers binding posts would be?
I'd like to see the variable phase section.
Thanks
Darkmoebius ,
Have a look at this site, from one of our fellow DIY'ers.
http://www.geocities.com/f4ier/subsub.htm
I build this x-over, and I'm very pleased with it.
Cheers.
Have a look at this site, from one of our fellow DIY'ers.
http://www.geocities.com/f4ier/subsub.htm
I build this x-over, and I'm very pleased with it.
Cheers.
That link is a good one!!
What you want is a flat frequency response.
Sealed enclosures roll off at 12db/octave while ported,24db/octave(for the most part)
so if your main speakers are ported...youl want a 24db/octave LPF on your sub with the same F3 as your mains,as a start.
A variable cutoff frequency is highly useful.
What you want is a flat frequency response.
Sealed enclosures roll off at 12db/octave while ported,24db/octave(for the most part)
so if your main speakers are ported...youl want a 24db/octave LPF on your sub with the same F3 as your mains,as a start.
A variable cutoff frequency is highly useful.
The schematic on Isaacs site is of a kit, which I've built. It's not bad, has quite a bit on it, defeatable 3rd order rumble filter, one band of parametric eq which is semi useful. I'd prefer a 4th order slope, since it would more easily more easily match vented mains, or if they are sealed, then it's better to have a 2nd order HP on them.
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