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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 3rd December 2019, 12:37 AM   #741
Denri is offline Denri  Russian Federation
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AllenB

I really like this topic and curious about one question.

First pages are covered first order filters and partly touches the second order filters for woofers at least.

But nothing said about mixing of different order crossovers.

I read some articles for car audio systems where used second order filter for woofer\low pass part of crossover while first order for tweeters. ( or vise versa for woofer tweeter )

What are drawbacks here in such designs?
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Old 3rd December 2019, 12:58 AM   #742
AllenB is offline AllenB  Australia
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Introduction to designing crossovers without measurement
An important reason why first order for woofer and second order for tweeter is a good combination, is because when you plot acoustic phase vs frequency, the plot winds faster for a higher order rolloff.

Now, the sound from the woofer usually arrives later than the tweeter. Maybe an easy way to explain this is that the woofer voice coil is usually set back a couple or a few cm from the tweeter because the woofer is larger and goes further back into the cabinet. This has the effect of winding the phase faster vs frequency.

So, it's about making them meet up better in the end.
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Old Yesterday, 07:21 PM   #743
Hensolo is offline Hensolo
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AllenB, hello. There are a few questions about my acoustics. This is an open box with a phase inverter with a rectangular output. Two midbasses, one mid and tweeter. I want to redo the crossover. In the initial state, the manufacturer claims the midbass-mid-400 Hz section frequency, mid-tweeter 3 kHz. With this crossover, the lower middle is in the hollow to - 20 dB from 100 Hz to 300 Hz. The lower midbass is trimmed by a larger inductance coil, the upper midbass is slightly smaller. These are the first orders. The middle from the bottom is cut off in the first order, from the top in the second. Tweeter second. It is a tape. Midbass are turned on in reverse polarity, and the middle and tweeter are in right polarity. When I switch midbass to right polarity, and the middle and tweeter also stay in right polarity, the middle gets better, the bass gets smaller. Which way to go to get a normal lower middle and normal bass? I took measurements of the impedance and phase of the whole system as a whole, the frequency response for each speaker without a filter, with filters and the whole system. The speakers were in regular places.

Last edited by Hensolo; Yesterday at 07:28 PM.
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Old Yesterday, 11:12 PM   #744
AllenB is offline AllenB  Australia
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Introduction to designing crossovers without measurement
I'd want to know why you have a dip at 100-300Hz. Maybe it is the crossover but maybe it is your box.

Please explain, or photograph your box. You say open box with a phase inverter with a rectangular output. Is this cardioid? Is it an open baffle?
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Old Today, 08:42 AM   #745
Hensolo is offline Hensolo
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The crossover circuit will be a little later.
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Old Today, 10:03 AM   #746
AllenB is offline AllenB  Australia
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Introduction to designing crossovers without measurement
If the crossover is at 400Hz, but the drivers are not in phase below this and they are in phase above it, this could mean that one driver crosses with a steep slope and one uses a shallow slope, so that they deviate with frequency.
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Originally Posted by Hensolo View Post
The crossover circuit will be a little later.
Good
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Old Today, 10:43 AM   #747
Hensolo is offline Hensolo
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Crossover. I do not know the magnitudes of the inductors.
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Old Today, 11:29 AM   #748
AllenB is offline AllenB  Australia
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Introduction to designing crossovers without measurement
All four drivers are doing something different. This is called a 3.5 way system because both woofers cover the bass but they share the midrange differently.
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Originally Posted by Hensolo View Post
the lower middle is in the hollow to - 20 dB from 100 Hz to 300 Hz.
Have you been able to measure this?
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Old Today, 12:07 PM   #749
Hensolo is offline Hensolo
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Frequency response left and right channel.
My answer appears after 3-5 minutes. It can be fixed?
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Last edited by Hensolo; Today at 12:13 PM.
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Old Today, 01:28 PM   #750
AllenB is offline AllenB  Australia
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Introduction to designing crossovers without measurement
Can you show the response with two woofers disconnected, with lower woofer and mid disconnected, and with upper woofer and mid disconnected. (only one channel is necessary, and the tweeter doesn't matter)
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My answer appears after 3-5 minutes. It can be fixed?
This only happens when you are new to the forum. It will be changed very soon.
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