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Old 20th November 2012, 02:20 AM   #7631
bcarso is offline bcarso  United States
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Originally Posted by Pano View Post
How notchy are we talking? Do you remember Q and depth in ballpark figures at least?
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Old 20th November 2012, 07:08 AM   #7632
1audio is offline 1audio  United States
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The notch depth was about 20-30 dB. I would put the Q maybe around 5-7 at a guess. Both would change with frequency.

Doing a detailed eq for bass in a room is a fools errand. Not only are rooms lumpy, they change with everything; doors, people, temperature, pressure etc. And location, move 6 inches and its start over. The resonances however come from major fixed features, length, width and height. The strongest is usually the height since floors and ceilings are pretty uniform, stiff and don't have much surface variation.
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Old 20th November 2012, 11:29 AM   #7633
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The notch depth was about 20-30 dB. I would put the Q maybe around 5-7 at a guess. Both would change with frequency.

Doing a detailed eq for bass in a room is a fools errand. Not only are rooms lumpy, they change with everything; doors, people, temperature, pressure etc. And location, move 6 inches and its start over. The resonances however come from major fixed features, length, width and height. The strongest is usually the height since floors and ceilings are pretty uniform, stiff and don't have much surface variation.
That in a nut shell sums it up and how I saw the problem . However I was right to question my overly complex approach . As said some "cart-springs " could do much good .

My long lost friend John Burton was just getting into DSP when I saw him many years ago . I suspect even his analogue adjustments were doing good ( cart-springs ) . His father is the famous historian Anthony Burton who did BBC programs like the past afloat .
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Old 20th November 2012, 01:07 PM   #7634
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Another question ? I have many OPA 604 . As the system does not have a sub woofer I felt these inserted between pre and power amp would be OK . If just the sub woofer I wouldn't being worrying . Looking at a twin T filter it might just work as is . The output impedance is 50 R and input 47 K of the pre to power amp . I am tempted to use valves as they would have my friends approval , op amps mine . Any thoughts ?
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Old 20th November 2012, 04:04 PM   #7635
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Before equalizing measure and analyze. Equalize only what does not change with microphone position. And ya'll be happy.
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Old 20th November 2012, 06:24 PM   #7636
a.wayne is offline a.wayne  United States
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http://www.q-audio.com/johncurl.pdf

Before hitting content , I was struck by the changes in john's appearance between 2001 and 2006..
Too much feedback, too little or nested ........


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Old 20th November 2012, 07:03 PM   #7637
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Before equalizing measure and analyze. Equalize only what does not change with microphone position. And ya'll be happy.
That's the best way of saying what took me an hour with my friend . Thanks everyone !
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Old 20th November 2012, 08:33 PM   #7638
dvv is offline dvv  Serbia
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John, never you mind ol' Wayne, all that sub-2 Ohms current must have gone to his head in the end.

You're still a cool looking dude, and your waistline clearly shows you are a man well capable of appreciating the finer points of life. No man can be complete without that. Life is far too short and valuable to waste on worrying about cholesterol, lipides and such like forms of distortion.

Just slew it all the way, is what I say. If you take out the coffeine from coffee, then what the hell is left to drink, other than coloured tap water, right?

Don't you pay any attention to these modern whizz bang kids, heck, they even have sex via the Internet. And they worry about my cholesterol? Sheesh ....
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Old 20th November 2012, 08:34 PM   #7639
tvrgeek is offline tvrgeek  United States
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Not me! If you followed my trials, prodding from those who do know, you will see my problems with amps and why the Rotel sounded better than the Parasound turned out to be a problem with the speakers. Once the speakers were sufficiently upgraded, sure enough the transparency and detail of the Parasound came shining clear through. The Rotel seems to have been designed specifically to mask tweeter distraction problems.
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Old 20th November 2012, 08:36 PM   #7640
dvv is offline dvv  Serbia
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That's the best way of saying what took me an hour with my friend . Thanks everyone !
Don Nigelino, how are you going to tackle the problem with all these minimalist devices, I'm just waiting to see who thinks of kicking out the power switch, as it's an extra contact and subverts true sound from coming out?
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