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Multi-Way Conventional loudspeakers with crossovers

Introduction to designing crossovers without measurement
Introduction to designing crossovers without measurement
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Old 9th February 2019, 04:31 AM   #621
MITsound is offline MITsound  Canada
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Introduction to designing crossovers without measurement
Quote:
Originally Posted by gazzagazza View Post
"15" 98db/octave woofers... " Are you sure?
98db/watt.
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Old 15th February 2019, 04:28 AM   #622
Tweet is offline Tweet  Australia
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Quote:
Originally Posted by Moondog55 View Post
Allens answer is an arguement in favour of 4-Way speakers with big subwoofers. Crossed as low as practical.
I read a while ago that Frank Sinatras voice had a fundamental frequency of 88Hz and was considered a Baritone which makes me wonder what Ivan Rebroffs/Barry Whites fundamental frequency were. I always thought the Sinatra was a tenor
It all depends on the speed setting .........33.3 or 45 rpm

'Old blue eyes' never liked the sound of his voice ...... he apparently said.

C.M
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Old 17th February 2019, 09:08 AM   #623
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by Moondog55 View Post
Allens answer is an arguement in favour of 4-Way speakers
I can see where you are coming from. There are many considerations leading to more ways or less ways. I'm more of a three way kind of guy, however I think at the end it needs to be done well for all the right reasons.
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Old 26th February 2019, 09:30 AM   #624
leo2 is offline leo2  Netherlands
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Hello,

I am new here on this fantastic thread.
I am going to build a two way speaker crossed over at 1920Hz. For my 4 ohm woofer this should give me a 0.33 mH inductor.
However, to accommodate a test enclosure I should run a 0.47 ohm resistor in series before the woofer. The inductor's Rdc wil be around 0,18 ohm. Which gives a total of 0,65 ohm.
Now my question is; will this raise my woofer's impedance to 4,65 ohm which will give me
a 0.39 mH inductor? Is this the right way to deal with this (still learning
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Old 27th February 2019, 09:27 AM   #625
AllenB is offline AllenB  Australia
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Your thinking is reasonable, the higher value might be the better choice.


Maybe though, there isn't much difference. Especially if you later discover that balancing the bass around the cabinet size makes a larger value useful. I think it is good to have pairs of inductors of different values spare in any case.
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Old 2nd March 2019, 02:22 PM   #626
Defo is offline Defo  Norway
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Simple question:

Say you hypothetically have a woofer and a tweeter with a natural 1st order roll-off against each other.
And you add a 1st order electrical filter to make a 2nd order acoustical one.

Do we then have a 180 degree phase shift?
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Old 5th March 2019, 09:40 AM   #627
AllenB is offline AllenB  Australia
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Yes. The response is exactly this combination.
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Old 14th March 2019, 06:08 PM   #628
raffajaffa is offline raffajaffa  United Kingdom
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Quote:
Originally Posted by Defo View Post
Simple question:

Say you hypothetically have a woofer and a tweeter with a natural 1st order roll-off against each other.
And you add a 1st order electrical filter to make a 2nd order acoustical one.

Do we then have a 180 degree phase shift?

WOW Just to confirm that I understand correctly.?
A first order (inductor only) woofer and a second order (cap and inductor ) are 180 degrees out of phase. This makes more sense for a simple design. ?
I must admit I have been running my two way Volt 2208 and Morel tweeter this way for quite a while.. This also gave me the purest cleanest sonics after slowly and surely working out a xover point by ear as the Volt gets very edgy above 3k I guess.
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Old 15th March 2019, 06:53 AM   #629
AllenB is offline AllenB  Australia
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Yes, with the right experimenting you can find these things out. By the way, each order of rolloff is 90 degrees from low to high. This means right in the middle at the crossover it is usually 45 degrees.
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Old 15th March 2019, 10:00 AM   #630
iperno is offline iperno  Italy
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Sorry for the interference, I need to make a change to a two-way crossover, used on a coaxial seas replaced with another model (I have the characteristics of both), is there anyone (expert) who can advise me?
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