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Old 26th August 2012, 02:47 PM   #7081
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In my system i handle rumble in a different way. My main panels are rolled off under 80Hz with a line filter of 6dB octave. They are down -15dB at 20Hz and -21dB at 10Hz.
Then i have an active sub that is Mono. The sub has a subsonic filter ( 18dB ) under 18Hz and some other tricks. Excess Cone movement is nill.
That may be one answer why i do not suffer "Soundstage Shrinkage ".

Last edited by Joachim Gerhard; 26th August 2012 at 02:50 PM.
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Old 26th August 2012, 02:48 PM   #7082
Salas is offline Salas  Greece
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Quote:
Originally Posted by RCruz View Post
How did you do this sim ?
I invoked AC analysis, deleted an input cap that was there, energized small signal AC, and boom.
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Old 26th August 2012, 02:49 PM   #7083
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Quote:
Originally Posted by Joachim Gerhard View Post
In my system i handle ruble in a different way. My main panels are rolled off under 80Hz with a line filter of 6dB octave. They are down -15dB at 20Hz and -21dB at 20Hz.
Then i have an active sub that is Mono. The sub has a subsonic filter ( 18dB ) under 18Hz and some other tricks. Excess Cone movement is nill.
That may be one answer why i do not suffer "Soundstage Shrinkage ".
Quite possible indeed. That is why you could not know what they were talking about.
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Old 26th August 2012, 02:51 PM   #7084
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Have edited my post : "rumble" and -15dB at 20Hz, - 21dB at 10Hz
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Old 26th August 2012, 02:57 PM   #7085
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Joachim Gerhard View Post
Ricardo, the "natural" input impedance of the Paradise is around 10kOhm.
Say you need 2.3kOhm loading of the transformer ( Sowter 8055 ) you need a loading resistor of ca. 3kOhm. It appears in parallel to the "natural" input impedance.
Using a 1:10 sut I would load the cart with only 10000 / 10 square = 100
The tuscany "likes" 470r.... anyway it is good to know.
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Old 26th August 2012, 02:59 PM   #7086
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Transformer loading is different from resistor loading. To reach 470 Ohm you would need an enormous secondary impedance and that may not damp the transformer optimally.
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Old 26th August 2012, 03:01 PM   #7087
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For the Tuscany I built a jfet input stage with a 47kr ohm resistor. The 1:10 sut pulls it down to 470r... It works very well indeed.
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Old 26th August 2012, 03:02 PM   #7088
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Here you can find information about the Sowter that i use sometimes. It is a good one besides Lundahl and Jensen. I have personally no experience with Cinemag and Haufe.
I tried Pikatron in the old times.
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Old 26th August 2012, 03:02 PM   #7089
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Sowter Type 8055
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Old 26th August 2012, 03:04 PM   #7090
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You may get a super sonic overshot when you load the transformer light that can sound very attractive.
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