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Old 8th April 2004, 05:01 AM   #1
CH2 is offline CH2
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Default Help for Crossover Designing for 3 way speaker

Hi all

Thanks for reading this thread. I am new and totally unexperience in speaker design. I have just been tasked by my friend to complete a set of uncompleted speaker. The spec of the speaker are as follow:

Tweeter: Focal tc120 tdx2, sealed enclosure, sensitivity=93.5db
Midrange: Focal 7k2, sealed enclosure, sensitivity=95.2db
Bass: Audax pr240m0, ported , volume= 70l, Q=0.7, sensitivity=95db.


The crossover has not been done and I have not a single clue about the how.

Can any of the Gurus, shed some light as to how I may start about doing the cross over?

For the design of the the bass unit, how can I tell if the speaker enclosure is ok for the driver?


Thanks alot for the help
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Old 8th April 2004, 08:28 AM   #3
CH2 is offline CH2
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Wow, those software cost many times more than my friend speakers.

Now I know it pays to write software emulating speakers than building speakers.

Anyway, thanks alot tbla for the link.

Anyone has the software, to help me do a quick calculation?

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Old 8th April 2004, 08:14 PM   #4
CH2 is offline CH2
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Any hint as to how I should get started?



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Old 8th April 2004, 08:40 PM   #5
tiroth is offline tiroth  United States
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www.speakerworkshop.com

Not easy to use, but free and invaluable.
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Old 8th April 2004, 08:47 PM   #6
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Another freebie.

http://www.pvconsultants.com/audio/crossover/pcdc.htm

And a primer.

http://members.aol.com/pjay99site/speakerhome.html
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Old 8th April 2004, 08:48 PM   #7
claudio is offline claudio  Italy
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Hi,
first look at the woofer FR off axis, that shows an upper limit of 500-600 Hz to be crossed with the mid; then look at the midrange off axis FR, the 3000-4000 Hz range should be the limit to cross it with the tweeter.

Try a free software to model the crossover, or just do acoustic tests with various crossovers. Check here, for enclosure program:
http://home20.inet.tele.dk/kou/ubmodel.html

and here for crossover: http://www.pvconsultants.com/audio/crossover/pcdc.htm

Regards

Claudio
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Old 8th April 2004, 08:58 PM   #8
sreten is offline sreten  United Kingdom
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How can I properly put this ?

For the quality of the units involved your friend has set you an
impossible task, and IMO you would be well advised to refuse it.

For a start you need two PR240MO per speaker.

sreten.
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Old 9th April 2004, 01:37 AM   #9
CH2 is offline CH2
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Hi Tiroth, Timn8ster, claudio and sreten

Thanks alot for all the help. I really appreciate it

I know my friend will never get to complete the speaker without any assistance. And I feel it is such a waste for all those good components, to be rotting away. Thus my objective is to maximise the value of the parts. My humble aim is to make the crossover.

Hi sreten

Is the bass too small for the above speaker? Is it possible that I compensate it with seperate woofer? I guess it would be even harder to get a set of speaker and woofer to work together

Thanks again
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Old 9th April 2004, 11:09 AM   #10
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by CH2
Hi sreten

Is the bass too small for the above speaker? Is it possible that I compensate it with seperate woofer? I guess it would be even harder to get a set of speaker and woofer to work together

Thanks again
No its not that.

Due to baffle step you need 2 95dB units in parallel
to match the sensitivity of the mid and tweeter.

sreten.
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