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In Reply to: RE: The original Soundstream recordings were made posted by Robert C. Lang on July 04, 2007 at 23:24:50
It is true the -3dB point on the Kappa 7's is 37Hz, they are supposed to have useful bass down to 25Hz according to a review at the time they came out. So I may not reproducing the problem areas of the early Telarc's since I’m sure there is nothing below 25Hz.
From what I understand Telarc started moving the microphones closer in as D/A converters started to improve. Could it be the distant microphoning that produced too much level in the ultra-low frequencies?
The foam on my woofers still looks and sounds new. My Kappa 7's are 15 years and 2 months old.
One thing I love about sealed acoustic suspension enclosures is their woofers near total lack of distortion. Most speakers made nowadays are bass reflex and I can hear tons of distortion putting my ear right on either the woofer or reflex duct. However with my Infinity woofers there is no audible distortion with my ears right up against the woofer.
Once I do hear distortion could it indicate that I need to replace the foam surrounds?
I have listened to many, many speakers in the last 15 years and the only ones I like better than Infinity are the larger Magnaplaners.
"Music is love"
Teresa
I can't speak to whether distant microphoning produced too much level in the ultra-low frequencies?
I have never owned a ported design so I can’t speak to the distortion levels but I understand that sealed systems do provide more abundant bass than a comparably rated ported system. That’s because a ported system’s bass falls off like a rock while a sealed system bass rolls off much more slowly. So, while a ported system rated to down –3db at, say, 40Hz truly has almost no meaningful bass below that point a sealed system bass response rated at 40 Hz –3db will roll off gently and produce a meaningful response for another 1/3 of an octave or so.
Of course, that same ported speaker can be designed significantly smaller and more efficient because of the port, that some say can make audible noises in some speakers. This is probably the main reason why there has been a proliferation of ported designs and a commensurate decline in sealed designs.
Regarding the foam surround, the low humidity in the Reno area may ensure a longer life for the surround. Don’t necessarily expect a gradual deterioration in the way the surround looks. One day things can look fine and the next day you see cracks and holes. There may be a deterioration in sound quality but it is unlikely that you will notice it because of the gradual nature of it. Once the surround is replaced you will quickly notice the improved bass definition
Robert C. Lang
"Music is love"
Teresa
bits of foam will break off.There will be holes in the surrounds. My four woofers in my I981 Infinity Reference Standard II's all had to be replaced in 1997. I was told by refoamer, Simply speakers Clearwater Fl.new foam would last longer (BTW they did outstanding job as evidenced by solid bass sounds which my Marantz SA11 produces. For more om my wonderful infinitys:
http://www.infinity-classicsy/models/Reference-series-1+b-2-10+A+B-1981-86/in
dex-Reference.htm
sorry for confusion
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