Another please explain this crossover ...

TurboFC3S · 30th September 2006, 01:22 AM

I'm trying to learn this stuff, slowly but surely

For now, could somebody please step me through this schematic. The literature for the speaker (Wharfedale Evo 30) says crossover points are 60hz and 3200hz, how is that possible with such small inductors? And also, I have the physical crossover out of the speaker and it has one pretty big iron core inductor that sure looks bigger than anything on this schematic! I can post a pic of it if it helps.

ocool_15 · 30th September 2006, 05:00 AM

Maybe the speaker plays down to 60hz. From what I see for components I do not see anything that indicates a 60hz crossover point.

~1600hz if a 6 ohm low pass with what looks like a zobel is the lowest part. the center is a 12db/oct low pass and the top is a 18db/oct high pass with attenuation for the tweeter. If you have the nominal impedence of the drivers it would be easier to understand the crossover.

TurboFC3S · 30th September 2006, 03:53 PM

All the drivers are rated at 6 ohm.

TurboFC3S · 1st October 2006, 02:18 AM

You probably could have guessed, but from top to bottom is the tweeter, midrange, then woofer. And like I was saying, the paperwork says the crossover points are 60hz for the woofer, bandpass 3200 for the mid, and 3200 highpass for the tweet.

David Gatti · 1st October 2006, 03:43 AM

60Hz must be a typo. From the values in the crossover, 600Hz seems far closer to the mark.

Willitwork · 1st October 2006, 03:46 AM

Unless the woofer is somehow installed in a bandpass (mechanical) configuration through cabinet design there is no way those values could yield a 60Hz cut-off. Large ferrite-cored inductors could mean there's a mistake on the schematics printout.

sreten · 1st October 2006, 04:03 PM

Hi,

Its a 2.5 way crossover. There is no 60Hz c/o.

/sreten.

tinitus · 1st October 2006, 04:46 PM

I think 0.6mH on low woofer might be typo error....6mH would make a lot more sense

Willitwork · 2nd October 2006, 01:31 AM

LOL, just had a glance at the Wharfedale Evo. Should've done that first then I wouldn't have bothered with wild theories. Like Sreten posted it's a 2.5 way speaker, not a 3-way, and the LF cutoff is listed as 160Hz even though the literature is void of details on how this is achieved. Woofers are only 6-inchers (17cm) so my guess is that cabinet cavity bandpass filtering is used.

This being said the xover schematics still looks a bit odd, and it's out of phase.

TurboFC3S · 2nd October 2006, 05:13 PM

Sorry if I implied it's a 3way, you're right it's a 2.5 ...

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30th September 2006, 05:00 AM	#2
ocool_15 diyAudio Member Join Date: Nov 2004 Location: sk	Maybe the speaker plays down to 60hz. From what I see for components I do not see anything that indicates a 60hz crossover point. ~1600hz if a 6 ohm low pass with what looks like a zobel is the lowest part. the center is a 12db/oct low pass and the top is a 18db/oct high pass with attenuation for the tweeter. If you have the nominal impedence of the drivers it would be easier to understand the crossover.

30th September 2006, 03:53 PM	#3
TurboFC3S diyAudio Member Join Date: Aug 2006	All the drivers are rated at 6 ohm.

1st October 2006, 02:18 AM	#4
TurboFC3S diyAudio Member Join Date: Aug 2006	You probably could have guessed, but from top to bottom is the tweeter, midrange, then woofer. And like I was saying, the paperwork says the crossover points are 60hz for the woofer, bandpass 3200 for the mid, and 3200 highpass for the tweet.

1st October 2006, 03:43 AM	#5
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	60Hz must be a typo. From the values in the crossover, 600Hz seems far closer to the mark.

1st October 2006, 03:46 AM	#6
Willitwork diyAudio Member Join Date: Aug 2006	Unless the woofer is somehow installed in a bandpass (mechanical) configuration through cabinet design there is no way those values could yield a 60Hz cut-off. Large ferrite-cored inductors could mean there's a mistake on the schematics printout.

1st October 2006, 04:03 PM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Its a 2.5 way crossover. There is no 60Hz c/o. /sreten.

1st October 2006, 04:46 PM	#8
tinitus diyAudio Moderator Join Date: Nov 2005	I think 0.6mH on low woofer might be typo error....6mH would make a lot more sense

2nd October 2006, 01:31 AM	#9
Willitwork diyAudio Member Join Date: Aug 2006	LOL, just had a glance at the Wharfedale Evo. Should've done that first then I wouldn't have bothered with wild theories. Like Sreten posted it's a 2.5 way speaker, not a 3-way, and the LF cutoff is listed as 160Hz even though the literature is void of details on how this is achieved. Woofers are only 6-inchers (17cm) so my guess is that cabinet cavity bandpass filtering is used. This being said the xover schematics still looks a bit odd, and it's out of phase.

2nd October 2006, 05:13 PM	#10
TurboFC3S diyAudio Member Join Date: Aug 2006	Sorry if I implied it's a 3way, you're right it's a 2.5 ...

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