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Multi-Way Conventional loudspeakers with crossovers

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Old 1st February 2018, 09:00 AM   #31
giralfino is offline giralfino  Italy
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Since you read the sticky thread, be sure to read also the post #20, or better follow the link from there to the presentation from Dave Dal Farra. AllenB tutorial is good in explaining what happens, but it omits the fact that many have a very powerful system (the PC) that can easily simulate what happens when a driver is put on a baffle. With the same approach you can test the Linesource crossover.

Ralf
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Old 1st February 2018, 09:11 AM   #32
Roo2 is offline Roo2  Australia
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Thanks Ralf. I've just taken a quick look at that and it does look good!
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Old 20th March 2018, 05:52 AM   #33
Roo2 is offline Roo2  Australia
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Hello again. I've looked into this some more and time is getting the better of me I need some help.
Could one of you fine people help me with the crossover design?
I will make this 18.5L, 38Hz slot ported enclosure:
SB 18 - April 2012 - Loudspeakermagazine 2012 | Loudspeakerbuilding
This crossover designed by Linesource looks excellent but I notice he's allowing for a slightly different enclosure (0.75cuft, 42Hz). Can I use this crossover design or does in need to be tweaked a bit for the 18.5L, 38Hz enclosure linked above?
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Old 20th March 2018, 03:24 PM   #34
Xerxes75 is offline Xerxes75  Netherlands
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the article also shows the used crossovers in the SB18, you can also find the values used..
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Old 20th March 2018, 08:21 PM   #35
Roo2 is offline Roo2  Australia
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Hi Xerxes75. I’m using a different (Vifa DG25) tweeter. And I still don’t know how to find all the values..

Last edited by Roo2; 20th March 2018 at 08:24 PM.
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Old 21st March 2018, 10:35 AM   #36
Xerxes75 is offline Xerxes75  Netherlands
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Hi Roo2, you're right. I mixed up the SB EKA with the SB18. For the EKA you can find the values and even in my best German I can't find the values for the SB18 crossover. But I did find many building threads and numerous shops who provide the crossover parts for reasonable prices although I don't what the shipping costs would be..

R.
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Old 15th February 2019, 08:44 AM   #37
Roo2 is offline Roo2  Australia
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Hello there. Would anyone out there have a photo of some neat hook up wiring for a 2 way BW3 crossover just like the one in the top right of this? Thanks
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File Type: jpg BW3 2 way.jpg (131.1 KB, 115 views)
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Old 15th February 2019, 09:10 AM   #38
giralfino is offline giralfino  Italy
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Here is my way. You also need to connect the - input with the - on the woofer and tweeter output. I had to make assumptions on all the resistors: one in front of the tweeter HP, two for a L-pad, and one in series with the cap in the woofer part.

Ralf

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File Type: jpg BW3 2 way-2.jpg (61.4 KB, 127 views)
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Old 15th February 2019, 10:46 AM   #39
Roo2 is offline Roo2  Australia
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Thanks Ralf. Yes, it was the negative connections I was having trouble visualising.
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Old 23rd February 2019, 02:53 AM   #40
Roo2 is offline Roo2  Australia
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Hello again,
See photo attached. Seeking your feedback on the preliminary component placement for my BW3 crossover before I solder it together. Positive input on left. Both positive outputs on right. High pass across the top. Low pass across the bottom. A common negative ground rail for everything in the centre.
The main bit I'm not sure about is how close I have my first HP capacitor and inductor in the top left corner. I was thinking about moving them apart but that might compromise the position of the inductor wrt the first big inductor in the LP below. Maybe it doesn't matter? What do you think?
Anything else wrong that you see?
Thanks
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File Type: jpg BW3 crossover1.jpg (823.2 KB, 69 views)

Last edited by Roo2; 23rd February 2019 at 02:59 AM.
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