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Rubber vs Foam surround
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speakerguru
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Joined: 18 Nov 2005
Posts: 959
Location: Green Hut, Tovil

PostPosted: Mon Sep 17, 2012 8:51 am    Post subject: Reply with quote

Models 1, 2, 3 and 4 designed in the late 90s had an inner reflex cabinet driving the outer cavity. This results in two excursion reducing regions in the bandpass response at the expense of a higher order cut-off slope below the inner box tuning frequency. You don't get anything for nothing.
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steve59
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Joined: 14 Mar 2015
Posts: 17
Location: chicago il

PostPosted: Sun Mar 22, 2015 10:01 pm    Post subject: Reply with quote

The'authorised' Kef service center I brought my 105/3's to repaired the surrounds with rubber... My only complaint is the same as always, the speakers sound to lightweight in most rooms.
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clubsport911
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Joined: 26 Aug 2012
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Location: Cheltenham, UK

PostPosted: Mon Mar 23, 2015 10:45 pm    Post subject: Reply with quote

Lightweight compared to what ? Most rooms have so called "room gain" which accentuates the lower registers somewhat...

What is your point of reference ? (No pun intended)

Rgds
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proffski
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Joined: 22 Aug 2003
Posts: 1297
Location: Tewkesbury UK

PostPosted: Tue Mar 24, 2015 10:25 am    Post subject: Reply with quote

Interesting question, my reference currently is "Saint Saens Symphony number 3".
If recorded at a decent venue and good organ the 32ft stops generate more acoustic watts at 16Hz than any Hi-Fi system!
In live concerts (Royal Festival Hall) one can almost feel the air displaced wafting up the trouser lega and flapping them! Smile

Another good one is BoŽllmann Suite Gothique, sadly I have not heard this one live yet...
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vistisen
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Joined: 01 Sep 2006
Posts: 57
Location: Denmark

PostPosted: Thu Mar 26, 2015 9:12 pm    Post subject: Reply with quote

proffski wrote:
Interesting question, my reference currently is "Saint Saens Symphony number 3".
If recorded at a decent venue and good organ the 32ft stops generate more acoustic watts at 16Hz than any Hi-Fi system!
In live concerts (Royal Festival Hall) one can almost feel the air displaced wafting up the trouser lega and flapping them! Smile

Another good one is BoŽllmann Suite Gothique, sadly I have not heard this one live yet...

I'm the son of a church organist, I love my father's put down of a bass guitarist's boasting about the size of his speakers. "Yep my bass diaphragm is 32 ' long, not 32 inches wide, and there's another one beside for the next note as well"
REAL bass blows out candles
Liverpool cathedral has a 64' bass stop that's an amazing 8 Hertz at the lowest note. There is one cathedral that has the vibrating reed at the bottom end of its double faggot (32') encased in glass, you can see actually see the bass vibrations at 16 Hz, I cannot remember which.
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proffski
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Joined: 22 Aug 2003
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Location: Tewkesbury UK

PostPosted: Fri Mar 27, 2015 10:46 am    Post subject: Reply with quote

Back to loudspeakers... Suddenly the foam in the 104/2s just disintegrated, almost over one weekend. They have just been refoamed throughout by a person a lot more capable than I am.
Listening tests to come over Easter.
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steve59
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Joined: 14 Mar 2015
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Location: chicago il

PostPosted: Mon Mar 30, 2015 1:26 am    Post subject: Reply with quote

when my 105/3's needed refoaming kef sent me to an authorised dealer who used butyl on the outer surrounds and only cleaned the inner donut, while i'm pretty sure they did it wrong i'm here to tell you they sound terrific many years later.
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