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Multi-Way Conventional loudspeakers with crossovers

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Old 8th October 2012, 07:18 PM   #11
tvrgeek is offline tvrgeek  United States
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The golden ration seems to be pleasing to the eye. Other than that, not much use. It is 3-5-7 actually. The best way to distribute reflections is a non regular shape. I find proper stuffing works just fine and I spend my extra time worrying about the crossover.

The best acoustic room I ever had was in a mobile home. The ceiling was vaulted (double wide) and the walls were just about transparent to bass, so no bass cancellations. I loved it. I doubt the neighborhood did.
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Old 8th October 2012, 07:49 PM   #12
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by tvrgeek View Post
It is 3-5-7 actually.
Hi,

No its not, actually .....

It is (1+ squareroot5)/2 = 1.62, 1/1.62 = 0.62,
1/0.62 = 1.62, commonly rounded to 0.6:1:1.6.
which equals 3:5:8 as round number estimates.
5/8's:1:8/5's is the same as 0.6:1:1.6.

Triangular rooms or boxes don't stop resonances they move
them to where the symmetry of the triangle creates a box.

For width and depth its a fair way to dimension a box but
for height lots of other things come into it for convenience.

rgds, sreten.
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Old 8th October 2012, 08:04 PM   #13
balerit is offline balerit  South Africa
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Quote:
Originally Posted by tvrgeek View Post
The golden ration seems to be pleasing to the eye. Other than that, not much use. It is 3-5-7 actually. The best way to distribute reflections is a non regular shape. I find proper stuffing works just fine and I spend my extra time worrying about the crossover.

The best acoustic room I ever had was in a mobile home. The ceiling was vaulted (double wide) and the walls were just about transparent to bass, so no bass cancellations. I loved it. I doubt the neighborhood did.
I agree with you and 1.618 is actually visually ideal for doorframes and picture frames. In my books I state that the crossover is probably the most important part of the system. Incidentally i use 1.4142 in my ducted phase inverter designs as well as dimensioning my sound room. It's amazing when the room and speakers work together.

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Old 8th October 2012, 08:05 PM   #14
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+1 Ive never found it necessary to use the 2nd decimal place, and i use the 0.6:1:1.6 ratios. Working from the cube root and using the ratios. I think in this way you actually end up with a box a fraction small, maybe 5 percent. Typically that degree of accuracy is fine.
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Old 8th October 2012, 09:21 PM   #15
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If you use phi to generate internal dimensions, the outside ends up not being golden ratio because of the wood thickness... and in my CGRs the vent slot.

Click the image to open in full size.

Me, i just avoid crossovers for the most part, avoiding the evil they bring.

dave
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Old 8th October 2012, 10:00 PM   #16
tvrgeek is offline tvrgeek  United States
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Quote:
Originally Posted by sreten View Post
Hi,

No its not, actually .....

It is (1+ squareroot5)/2 = 1.62, 1/1.62 = 0.62,
1/0.62 = 1.62, commonly rounded to 0.6:1:1.6.
which equals 3:5:8 as round number estimates.
5/8's:1:8/5's is the same as 0.6:1:1.6.

Triangular rooms or boxes don't stop resonances they move
them to where the symmetry of the triangle creates a box.

For width and depth its a fair way to dimension a box but
for height lots of other things come into it for convenience.

rgds, sreten.
Quite correct. I guess I was instructed wrong 50 or so years ago.
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Old 8th October 2012, 10:12 PM   #17
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Phi is an irrational number, so has no fractional representaion. You can get to phi from the fibonacci series:

1, 1, 2, 3, 5, 8, 13, 21, 34, 55 ...

dave
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Old 8th October 2012, 10:16 PM   #18
tvrgeek is offline tvrgeek  United States
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Dave,
Do you also dislike any passive network? BSC, any bit of shaping? I guess I have not figured out what is so wrong with passive networks. Incorrectly designed ones, yes. Crossovers placed within our most sensitive hearing bands, yes. I don't know what is basically evil about them.
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Old 8th October 2012, 10:21 PM   #19
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I avoid passive filters, preferring acoustic solutions 1st.

dave
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Old 8th October 2012, 11:25 PM   #20
tinitus is offline tinitus  Europe
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guys, you are off topic


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