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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 11th November 2017, 04:25 PM   #571
BobCat1950 is offline BobCat1950  United States
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Default Help!

I have a pair of Minimus 7 die cast aluminum speakers and i salvaged coils and capacitors from a pair of M7W. They are similar in measurements; C1=C2= 4.7 uF and L1=L2= 0.4mH.
The original crossover was filtering low frequencies to 1 inch dome tweeter (8 ohm) but the 4 inch woofer had no filter. Am i correct to assume that the woofer is actually duplicating some of the frequencies of the tweeter then.
I plan to take the salvaged parts to make a 2-way crossover putting the cap in parallel and the coil in series. Will this make a noticeable difference?
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File Type: jpg Minimus 7 7W Original X-over.jpg (30.0 KB, 79 views)
File Type: jpg Minimus 7 modified X-over.jpg (33.1 KB, 80 views)
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Old 12th November 2017, 11:31 PM   #572
phivates is offline phivates  United States
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Bobcat: The silence is the forum giving you time to read through this thread.
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Old 13th November 2017, 01:28 PM   #573
BobCat1950 is offline BobCat1950  United States
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Originally Posted by phivates View Post
Bobcat: The silence is the forum giving you time to read through this thread.
thx for the info; I just saw this thread and thought i'd ask first, thx
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Old 15th November 2017, 07:07 PM   #574
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by BobCat1950 View Post
Am i correct to assume that the woofer is actually duplicating some of the frequencies of the tweeter then.
---
will this make a noticeable difference?
On the surface, the less duplication there is suggests the less difference it will make.. and there obviously isn't too much or they might(?) not have been made that way.. but when you listen to a woofer on its own without a filter they typically have an edge to the sound, gaps and peaks at the top end where the cone isn't operating as satisfactorily as it should, before dropping off.

Adding a filter can trim this, adding a controlled rolloff while limiting the bandwidth. Using the same coil/capacitor combination for both woofer and tweeter is a reasonable choice for a random assignment (without measurement). This assumes the two have an overlapping region where they can behave well and meet at some point after being trimmed. Some experimentation will still be in order.
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Old 15th November 2017, 07:37 PM   #575
BobCat1950 is offline BobCat1950  United States
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Quote:
Originally Posted by AllenB View Post
On the surface, the less duplication there is suggests the less difference it will make.. and there obviously isn't too much or they might(?) not have been made that way.. but when you listen to a woofer on its own without a filter they typically have an edge to the sound, gaps and peaks at the top end where the cone isn't operating as satisfactorily as it should, before dropping off.

Adding a filter can trim this, adding a controlled rolloff while limiting the bandwidth. Using the same coil/capacitor combination for both woofer and tweeter is a reasonable choice for a random assignment (without measurement). This assumes the two have an overlapping region where they can behave well and meet at some point after being trimmed. Some experimentation will still be in order.


Thank you so much, Allen B. You have actually helped a great deal. I am the original owner of the M7 from the late 80's and always felt/heard these speakers had more high's but when I modified the crossover I thought I could hear a big difference. Recently I set the M7 speakers to my Denon DRA-325R stereo as B speakers; put them about 5 feet above the A speakers(Mirage FRx 3's which I used to replace some older B & W V201's that seemed to have more than normal bass but that's another story) on top of the entertainment center facing up about 2 ft or less from the ceiling and I heard a lot more from the M7's which don't have as much bass as the A's but when played by themselves the sound was great on a Kitaro CD. I was modestly impressed! When both A & B play the room is full sound.
Thanks again for the Information, Allen. I appreciate it immensely.
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