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Multi-Way Conventional loudspeakers with crossovers

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Old 10th May 2007, 07:04 PM   #1
stevez is offline stevez  United States
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Default crossover question

To those who have lots of experience designing crossovers: I've looked at several 2-way systems like the eros from speakerbuilder.net, and the waveguide project at Zaph audio, and when I simulate the crossovers, the tweeter cutoff points seem very high. Like 11 KHz or so but the design says the tweeter and woofer are crossed at like 2 or 3 KHz. Whats up with this?
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Old 10th May 2007, 09:15 PM   #2
DougL is offline DougL  United States
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What Simulation package are you using?

I have good luck replication both speaker workshop and
LPG-cad (sp) in soundeasy.

HTH

Doug
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Old 11th May 2007, 07:30 AM   #3
stevez is offline stevez  United States
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I actually wrote out the transfer function for the filter and found the pole. I then checked these results using PSpice and found the half power points and they matched the work I did on paper.
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Old 11th May 2007, 07:31 AM   #4
stevez is offline stevez  United States
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Actually for these crossovers I wrote out the transfer functions by hand to find the crossover points, the poles of the function. These didn't seems right to me so I check these results using PSpice and I got the same exact results. Half power point was way too high. What do you guys make of this?
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Old 11th May 2007, 12:11 PM   #5
stevez is offline stevez  United States
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oops, sorry for the double post.
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Old 11th May 2007, 12:54 PM   #6
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Could you be mixing radians with Hz? Just a quick thought.
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Old 11th May 2007, 01:24 PM   #7
sreten is online now sreten  United Kingdom
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Click the image to open in full size.

above is drivers with c/o, below is without, tweeter electrical is around 10Khz.

Click the image to open in full size.

The acoustic c/o point is 2-3Khz.

/sreten.
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Old 11th May 2007, 06:38 PM   #8
stevez is offline stevez  United States
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I guess the waveguide boosted the frequencies below 11K so he had to cross it there.

jimangi- nah i pulled out the 2*PI
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Old 12th May 2007, 02:36 PM   #9
sreten is online now sreten  United Kingdom
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Quote:
Originally posted by stevez
I guess the waveguide boosted the frequencies below 11K so he had to cross it there.

jimangi- nah i pulled out the 2*PI
Hi, but the target ~ 2nd order L/R acoustic around 2.5kKz is achieved, /sreten.
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Old 12th May 2007, 05:27 PM   #10
tinitus is online now tinitus  Europe
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Stevez,.....Try and calculate/sim a 2.order LR filter ..... and dissregard the inductor .... ... and you will see its quite closer to Zaphs
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