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Multi-Way Conventional loudspeakers with crossovers

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Old 13th December 2014, 03:19 PM   #1
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Default 2 way speaker upgrade

I have 2 way speakers and i want to upgrade its crossover for better sound. Could any one help me please?
Here is some information about my speakers:
For low-pass: 15cm cone type
For high regions: 2.5cm dome shape
Impedance: 6 ohm
Max. input: 80W (EIAJ)
Output sound pressure level: 88dB/W/m
Cross over frequency: 3000 Hz
And here is the crossover i have drawn:
Click the image to open in full size.
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Old 13th December 2014, 04:46 PM   #2
Jay1111 is offline Jay1111  United States
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Sure disconnect the drivers from the crossover and measure their individual frequency responses in the enclosure.

All that schematic tells me is the woofer has a 1st order electrical without any baffle step compensation, and the tweeter has a 2nd order electrical.

I guess you could try this to add some BSC

http://speakerdesignworks.com/bafflestep.html
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Old 13th December 2014, 04:55 PM   #3
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How about going active?

Mini dsp might be interesting if you have a spare amp (thinking of getting one myself).

You could also fool around with foobar2000 and the foodsp xover.
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Old 13th December 2014, 04:59 PM   #4
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Please use the "attachements" for the picture and not another host: I cannot see anything
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Old 13th December 2014, 05:10 PM   #5
xrk971 is offline xrk971  United States
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Here is a no cost way to play with active XO and DSP in mono before taking the plunge for a active 2 way with 4 channels.

It really works.

Using stereo sound card to create a mono 2 way active crossover
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Old 13th December 2014, 11:07 PM   #6
system7 is offline system7  United Kingdom
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This is impossible without knowing what sort of 15cm. bass and tweeter we are dealing with, and the cabinet, whether reflex or closed box. Crossover is very specific to drivers and cabinet and impedance.

I think a photo and model number would help.

Often enough this is a 4 ohm plastic bass with an 8 ohm metal or soft dome tweeter.

But, WHO KNOWS?
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Old 15th December 2014, 02:02 AM   #7
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My speakers' model is Onkyo D-072A. Here's the link ONKYO D-072A. It's a reflex type. I will make some photos of the drivers and post here for your reference.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
http://i1235.photobucket.com/albums/...er-d072a-1.jpg
http://i1235.photobucket.com/albums/...ross-photo.jpg

Last edited by ngovanhinh; 15th December 2014 at 02:12 AM.
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Old 15th December 2014, 02:16 AM   #8
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Quote:
Originally Posted by Jay1111 View Post
Sure disconnect the drivers from the crossover and measure their individual frequency responses in the enclosure.

All that schematic tells me is the woofer has a 1st order electrical without any baffle step compensation, and the tweeter has a 2nd order electrical.

I guess you could try this to add some BSC

bafflestep
Sorry, but I don't have equipment for measurement as you told. Dou you have any other way?
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Old 15th December 2014, 10:18 AM   #9
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Here are photos of the bass and treble drivers:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 15th December 2014, 10:25 AM   #10
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There is no other way I'm afraid. To be able to improve performance, you need to know what the drive units are doing. If you don't know what they're doing, any attempt at changing the crossover is simply flailing around in the dark.

For example: the 0.33mH coil on the bass driver does not include any electrical compensation for baffle-step loss. However, they might not actually need any electrical compensation -it depends on the inherent frequency response of the driver, but without measuring, you don't know.

For what little it's worth, the filter components appear spectacularly cheap & I doubt with a speaker of this kind the ESR of the caps etc. will be very critical, so you could try replacing them with higher quality (reasonably priced) types. But I don't honestly think they're worth you spending much money on, so I'd be more inclined to leave them alone & save up to either buy or build something better.
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