Help with x-over

aladdin sane · 6th April 2006, 06:47 PM

Hi! I'm new to loudspeaker building, and I need some advice about creating the filter. The design I use is a model from TNT audio called primaluce the design
I have switched the loudspeaker parts out with elements from SEAS. the woofer with SEAS W22EX-001, the midrange with SEAS W15LY001 and the tweeter with T25C003 .
What I need answer for is what type of filter I should make, the cut-off and other general tips.

Thanks for any response.

Cal Weldon · 6th April 2006, 10:33 PM

Hi AS,

General tips?

OK, you don't just swap parts, you design the boxes and XO's for the drivers.

If you have the T/S parameters for both sets of drivers you can sometimes adapt.

A good starting point for XO's is 12dB/octave.

Without a lot of experience your idea can backfire on you and leave you very disappointed.

Sorry for the downer but it's a tall order.

aladdin sane · 7th April 2006, 05:10 PM

i have designed the new boxes so it will fit the drivers. I used a excel spreadsheet (unibox)

morbo · 7th April 2006, 05:27 PM

alladin - the problem is that the xover is the main part of any speaker design, and the most difficult to do. It isnt just something like box design where you throw a few parameters into some software and it spits out correct alignments. It is also specific to the driver combination used.

Without good measurements of your drivers in your baffle, no one is going to be able to design a crossover for you.

Basically what Cal was trying to say (nicely) is that you were wrong to assume you can swap out the drivers and easily make a new crossover for them. You are designing a whole new speaker.

If you want to do this right, I suggest you get some measurement capability, the cheapest way is probably to buy a behringer ECM8000 mic and a UB802 mixer, then get some measurement/design software. Good free software includes speaker workshop, or the FRD consortium tools. good commerical products are LSPcad and Soundeasy. Be forewarned that with it will take a long time and lots of learning to get a 3 way sounding good. I know this is probably not what you want to hear, but thats the way it is.

6th April 2006, 06:47 PM	#1
aladdin sane diyAudio Member Join Date: Oct 2005	Help with x-over Hi! I'm new to loudspeaker building, and I need some advice about creating the filter. The design I use is a model from TNT audio called primaluce the design I have switched the loudspeaker parts out with elements from SEAS. the woofer with SEAS W22EX-001, the midrange with SEAS W15LY001 and the tweeter with T25C003 . What I need answer for is what type of filter I should make, the cut-off and other general tips. Thanks for any response.

6th April 2006, 10:33 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Hi AS, General tips? OK, you don't just swap parts, you design the boxes and XO's for the drivers. If you have the T/S parameters for both sets of drivers you can sometimes adapt. A good starting point for XO's is 12dB/octave. Without a lot of experience your idea can backfire on you and leave you very disappointed. Sorry for the downer but it's a tall order. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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7th April 2006, 05:10 PM	#3
aladdin sane diyAudio Member Join Date: Oct 2005	i have designed the new boxes so it will fit the drivers. I used a excel spreadsheet (unibox)

7th April 2006, 05:27 PM	#4
morbo diyAudio Member Join Date: Sep 2004 Location: Guelph, Ontario	alladin - the problem is that the xover is the main part of any speaker design, and the most difficult to do. It isnt just something like box design where you throw a few parameters into some software and it spits out correct alignments. It is also specific to the driver combination used. Without good measurements of your drivers in your baffle, no one is going to be able to design a crossover for you. Basically what Cal was trying to say (nicely) is that you were wrong to assume you can swap out the drivers and easily make a new crossover for them. You are designing a whole new speaker. If you want to do this right, I suggest you get some measurement capability, the cheapest way is probably to buy a behringer ECM8000 mic and a UB802 mixer, then get some measurement/design software. Good free software includes speaker workshop, or the FRD consortium tools. good commerical products are LSPcad and Soundeasy. Be forewarned that with it will take a long time and lots of learning to get a 3 way sounding good. I know this is probably not what you want to hear, but thats the way it is.

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