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In Reply to: RE: Here is the URL of the RC Filter Construction, if you are interested posted by rick_m on January 20, 2011 at 18:45:34
It's a <4 ohm speaker system, Infinity RSIIb.
Follow Ups:
"Infinity RSIIb"
Hey, my speakers are quite similar to those, they are Infinity Renaissance 90's which years ago replace my Infinity Quantum 3's. I just use Kimber 4/8 PR to feed them (one run is twice as long so the resistances are the same) it measures flatter than other cables I've tried and doesn't seem to need terminations. I haven't measured their Zin but the old Quantum's were just all over the place as a fn of frequency and simply hanging a 10ohm resistor on them improved the sound (and barely got warm). My notion, quite untested, is that the improvement was probably due to limiting the impedance variations that the amps saw.
I'm rather bipolar (but hope to advance to cmos some day) when it comes to stereos: I love having GOOD SOUNDING music at home and feel that it's the most valuable technological thing in my life this side of books. But my other hemisphere seems fascinated by them as tricky systems rarely adequately defined and implemented. Both add to the hobby value...
Rick
Here are mine, with the outboard crossovers I built for them. I have brand new EMIM diaphragms from Apogee Acoustics in Australia - the new diaphragms are MUCH better than the stock units in terms of clarity and dynamics, sound like electrostatics, almost.
Nice!
I'd ask if the crossovers made much difference but maybe I don't want to know. One of the reasons I'm using the models I am is that their shape fits perfectly in the space where I want them. But. OK. Did the crossovers make much difference? I've never had these open or swept them so don't really have a clue what's what. But since I'm still happy with their sound...
Rick
Yes, a very big difference (sorry). I have replaced all the electrolytics with film caps: Solen on the woofer, Solen bypassed with Mundorf Supreme on the low mids, Mundorf Supreme bypassed with Duelund CAST on the high mids, and Mundorf Supreme bypassed with Audicap Theta on the tweeters. Iron core inductors are replaced (except for a 9.5mH on the midrange shunt circuit - too big!) with Northcreek 12 gauge on the woofers and low mids, and Solen Heptalitz 14 gauge on the high mids and tweeters. All wiring is Cardas Teflon insulated Copper Litz (11.5ga on woofers, 15.5 on mids, 17.5 on tweeters).
I also completely rebuilt the equalizer unit that came with the RSIIb's, which made even more of a difference than the crossover rebuild.
As I said, the EMIM diaphragms are the excellent Apogee upgrades; true ribbon design, Kapton film, built to last.
Sound is clean, clear, warm and wonderful. Bass is tight and deep. I am very happy with them.
Now I have yet another thing in the house that's either worn out or could be improved. And that's not counting me, likely the worst of the lot.
Good info, I'll save a copy against the day that these have problems or I get the urge to try and upgrade them. My wife has an extensive list of items with much, much higher priority just now so I anticipate enjoying what I have for quite a spell. Fortunately, that's easy.
Regards, Rick
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