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Getting ready to build some of these per the instructions on Alan Maher's website. I'm clear on the how to, but I was wondering about how many I need for speakers that are biwired, that is separate speaker cable runs to the high and low parts of each crossover.
Can/should I use one filter where the separate runs of speaker cable connect to the crossover (sort of star wiring) + one at each channel of the amp end for a total of 4, or two where the speaker cables connect to each side of the crossover for a total of six filters?
Thanks
Follow Ups:
You should add these to one type of place at a time and listen for the changes. Even if the amp has stabilization networks inside, adding a filter at the amp binding posts may give an improvement.
If you don't hear an improvement after some break-in, then don't leave them in place.
Dear Al,
I have the Walker designed R-C filters installed on my system. My speaker wire length is 25 feet. I am using a SET tube amp (Art Audio PX-25 amp) and Klipsch horn speakers. Do you have a reccomendation on changing the cap and resistor values in light of the long wire run and a tube amp? Have you tried soldering the R-c network to the speaker driver terminals directly? Mine are currently mounted to the speaker binding posts.
Thank you for your many informative posts. Your dedication to advancing audio reproduction is truely appreciated.
David Pritchard
If you are going to experiment, get some half-watt PRP resistors from Sonic Craft. If you can measure the cable's L and C, and estimate the impedance, you can try matching the resistance to the cable impedance.
Keep the corner frequency in mind. Going to 20 ohms will reduce the corner frequency by half compared to the Walker value of 10 ohms. Going much higher starts to affect the audio band unless you also decrease the size of the capacitor.
Yes, soldering the filters directly to the speaker cable ends is a better way to connect them.
With SET amps, you may not need filters at the amp ends of the cables. It is worth experimenting with this.
on this page, but the chances of you hearing the difference when you put filters ON are small. At least that's my experience; I didn't think they did diddly-squat! It's when I took the Walker links OFF I heard what they did.
I took them off, put a record on and walked to my chair. Before my butt hit the chair I was up, running across the room and turning the system off to place them back onto the speakers.
The difference IS silence! The grunge is gone, the filter removing RFI/EMI (at least that's how I recall Lloyd Walker explaining it to me) and spurious out of phase garbage. Everything is improved when NOISE is removed. (Ooooh, patent that line!)
This past weekend I was loaned a set of Awe-d-o-phile's (EconoTweaks) "Magnifiers" which are essentially the same thing as the Walker links. I'll be comparing them this weekend (I hope I don't like them, I'm Ribfest broke! But I have a feeling...I hope he takes used paper towels as trade items...or maybe gnawed rib-bones!).
There is no such thing as too many records.
There is just too little room for them!
It eliminates the issues with break-in. Just put them on, let them play for a few days, then listen carefully before and after taking them off one pair at a time.
I can see two possible ways these devices would benefit an audio system. One way, as Walker said, would be to damp the RF resonances in the speaker cable and speaker wiring. The other would be to stabilize the amp's behavior at ultrasonic frequencies. It may be the case that the filters are doing both things in most setups.
I developed the multiple-capacitor version to expand the radio frequency range over which the filters could provide damping to RF resonances. A one-meter cable will have a fundamental resonance of about 50 MHz, and this scales inversely with length. Thus, a three-meter cable would have its fundamental at 17 MHz, and would support a lot of harmonics.
The capacitor that Walker formerly used has a self-resonance of 21 MHz, as measured with the help of a neighbor with access to a Hewlett-Packard network analyzer. This means Walker's filter could do no more than damp the fundamental of many speaker cables, and would not be much benefit for the harmonics.
I built many versions of these. Probably 75 pairs. I tried the simpler one cap/one resistor and copied Chris D's(your's) more complex three cap/three resistor version using many different values. I found the single cap/resistor version did just as well. I found that using good silver wire, solder and spades improves things. I also found using a better quality cap and resistor (of the original .01/10 ohm values, thanks Al) does best.............in my setup anyway.
I'm going to get a couple of pair cryo'ed now and see what if anything that does. Cryo has helped everything I've previously had treated. We'll see!
ET
Question "Authority", the mainstream media sucks - Go Independent and hold BOTH parties accountable instead of just the other guys!
I need music to help forget the reality of today
Heat treatment works much better!
There is no such thing as too many records.
There is just too little room for them!
drawers off?
There is no such thing as too many records.
There is just too little room for them!
You left yourself open for so many attacks with that statement..........
I'm a nice boy...............and so busy of late it takes me 3-4 days to respond on AA........
ET
Question "Authority", the mainstream media sucks - Go Independent and hold BOTH parties accountable instead of just the other guys!
I need music to help forget the reality of today
I assume you are referring to the simple capacitor resistor across the plus and minus? Ideally you will need one for each leg of the cable (4) Many SS amps have incorporated this circuit on their outputs
nt
"We ask our artists to be true. Actually, we demand that our artists be true. When poets, storytellers, & singers lie to us for money, our culture is diseased & in decline."
-Robert Fripp
The link has disappeared from his website, but this should get you there.
Cheers,
Fred
:(
...We lost a number of active and inactive files, no thanks to Microcrap, the DIY filter will be reloaded just as soon as Chris sends a new copy. He is up to his eyeballs with work, so it maybe a few days before we can get it reloaded.
Alan Maher
Indeed, it is working again today and I put my link to it on my site back up. Thank you Alan!
ET
Question "Authority", the mainstream media sucks - Go Independent and hold BOTH parties accountable instead of just the other guys!
I need music to help forget the reality of today
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