loquatious
village elder
also saw this. looks very different from mine...
http://hirschl-and-adler.art.1stdibs.com/store/art_detail.php?id=16636
http://hirschl-and-adler.art.1stdibs.com/store/art_detail.php?id=16636
ran across the data sheet for the column II and thought i'd post it. last paragraph has some very interesting information and follows my original line of speculation. interesting, that the column II was considered an advancement over the more exotic WTLC, with its walsh tweeter. also note, even infinity can mis-spell bass!
I wonder if I disconnected the bottom woofer if the FR crater would go away? Hmmm.
Just thinking out loud here, but wanting to gather the facts as I understand them.
http://www.davidsaudio.com/Infinity_WTLC.pdf
marketing hyperbole aside, i know the WTLC used 8" woofers, and had other differences, but if the circuit in the column II was an outgrowth of the same concept the WTLC was using, there might be clues in the schematic of the WTLC that may shed light on what the column II was doing. maybe its comparing apples and oranges, but here it is.
http://elektrotanya.com/infinity_wtlc_200w_speaker_system_sm.pdf/download.html
sorry but i'm a long way from kansas. i'm in california, near san diego.
don't mean to be nit-picky, but the phrase infinity used was not that the bottom woofer "has" its own low pass filter, they said it "is" its own low pass filter. the implication was the mass addition had something to do with it, not that there was a separate filter physically added. so i think the natural mechanical roll off was what they meant. i obviously didn't dissect the voice coils on mine, but didn't see any difference between the fronts and bottoms when i had the dust caps off.
in terms of how they measured mass addition, i think they generalized a bit when they say 3X. since they added mass by painting tar on the cone with a brush, it would be hard to get the exact same application on each woofer. i also tend to think they are likely using the word mass interchangeably with weight. i know the two are not the same, but i''m guessing if the paper cone weighed, let's say, 1 gram by itself, they just told the "tar baby" to paint on 2 grams of tar.
well, my IIs are back together and i got to hear them for the first time yesterday. all drivers seem to be functioning which is a relief. i'm listening in the garage, so i'm not getting the best they have to offer. i did replace the 12.5 caps as long as i had them open, so i assume a burn-in period is in order. honestly, so far i'm not really impressed, but holding off judgment until i get them in the house. still need to address cosmetic issues, so for now they'll be doing garage duty. source material in my garage is limited to what i send by wifi from my mac, and room acoustics are hideous. i still have high hopes for them. want to get a turntable hooked up as source and really wring them out with some vinyl. for now, they work and i'm happy about that. no doubt if this FR issue gets resolved, i'll be opening them up again. maybe its because we've been talking about it so much, but i swear i could "hear" that crater…
hey, i've been meaning to ask, what are you guys driving your IIs with amp wise? how many watts? my reference series are rated 35-250 watts but are not happy unless they get 100 watts or more. are the IIs that way too, or are they happy with what ever you feed them? i'm giving mine 67 watts from one of my pioneer SA-1000s right now.
I'll see if I can find a song that has a LOT of music in the range where the craters are at. It would be good for a before and after listening test.
sorry, when i said mass and weight were not the same i was going back to my days working with NASA scientists at the ames research center. they would insist mass and weight were not the same, and would always point out that mass is the amount of matter in an object, and weight was the amount of pull gravity exerted on it. on earth they are generally considered to be the same, but those NASA guys were not on earth a lot of the time. your mass would be the same in space, but your weight could be very different. we're on earth and gravity is pretty much a constant, so i go along with your statement. we couldn't even hear the speakers if we were in space…
i know your speakers are a different situation, being basically custom made, one of a kind units. just the time you have into them makes them priceless. and they are absolutely beautiful. i'm just thinking out loud as a most-bang-for-the-buck kind of guy.
greg
next time you run into an origional set of column2s for 100 bucks, let me know. i would not mind picking up origional parts for that and shipping.
i know what you mean limited resorces i am on social security, 674 amonth does not go far. but home and car are paid for. so watch my bills and i eek by.
brian
looks like your on to something.
jolly good show