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Multi-Way Conventional loudspeakers with crossovers

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Old 8th April 2008, 02:58 PM   #11
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by audio_moksha

So sreten, you say that the Lipinskis are electronically crossed at 4k?
I read the article and it said somewhere that it was crossed at 2k?
Hi,

I estimate the electrical high pass to be ~ 4Khz, but could be wrong.
Acoustically the crossover point is 2KHz see fig 3.

/sreten.
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Old 8th April 2008, 03:06 PM   #12
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any specific suggestions sreten? I was thinking of starting off somwhwere with a low order butterworth for the tweets and maybe a LR for the midrange. However if the tweeter is phase inverted shouldn't the crossover be a 4th orfer L-R? Once again thans for all your expertise and suggestions.
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Old 8th April 2008, 03:17 PM   #13
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Quote:
Vifa midrange is a MG25 7"
Was there an "Vifa MG25 Yellow Glass Fiber cone"? I didn't find it... for the specs.
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Old 8th April 2008, 03:44 PM   #14
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by audio_moksha
any specific suggestions sreten? I was thinking of starting off somwhwere with a low order butterworth for the tweets and maybe a LR for the midrange. However if the tweeter is phase inverted shouldn't the crossover be a 4th orfer L-R? Once again thans for all your expertise and suggestions.
Hi,

For the low pass your first issue is baffle step compensation.

A symmetric driver aligned 4th order L/R acoustic response has
the two drivers connected in phase, 2nd order L/R out of phase.

Checkout Zaph's crossovers here : http://www.zaphaudio.com/

Note that most of the crossovers are slightly assymetric to make
up the phase difference betwwen the drivers, except the ZD5
which has a treble delay ladder, they are all acoustic targets.
Specifying an electrical target is fairly meaningless.

Also note the lipinski does not have symmetrical acoustic slopes
at all, but nevertheless seems to work very well in practise.

If you can get your head round SW then the following should not be too bad :

http://www.rjbaudio.com/Audiofiles/FRDtools.html
http://www.geocities.com/woove99/Spkrbldg/

/sreten.
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Old 8th April 2008, 04:14 PM   #15
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...or is it a 2xVIFA MG18WK/SK09-08 8ohms connected in parallel(?!)
http://www.tymphany.com/archives/10

Another Xreference
http://www.shine7.com/audio/speaker.htm
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Old 8th April 2008, 04:23 PM   #16
rob3262 is offline rob3262  United States
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Quote:
Originally posted by sreten

Specifying an electrical target is fairly meaningless.

/sreten.
Sreten, could you please expand on this?

I don't have a fundamental understanding of accoustic vs electrical orders.
Thanks
- Rob
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Scientific Principle and Common Sense
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Old 8th April 2008, 05:21 PM   #17
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by rob3262


Sreten, could you please expand on this?

I don't have a fundamental understanding of accoustic vs electrical orders.
Thanks
- Rob
Specifying an electrical target is fairly meaningless.
/sreten.



Hi,

for an example see http://www.zaphaudio.com/audio-speaker16.html

The acoustic target is 4th order L/R at 1.7khz.

The actual crossover is 2nd order electrical combined with the drivers
responses in box - this response includes baffle step and there is
no compensation of driver inductances or the tweeters impedance
peak at its Fs as this is not necessary. (as its a ferrofluid model).
(not the case for the XT25 see http://www.zaphaudio.com/ZD5.html )

The components in the crossover do not conform to any electrical
filter (e.g. Bessel, L/R, Butterworth etc), what counts is the total
acoustic result taking all factors into consideration.

See all of Zaph's other designs where this principle is applied.

/sreten.
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Old 8th April 2008, 06:39 PM   #18
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Quote:
...or is it a 2xVIFA MG18WK/SK09-08 8ohms connected in parallel(?!)
Yes this is the driver I had in mind; seems like what Lipinski uses.And sreten, thanks so much for all the information.

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Old 9th April 2008, 01:30 AM   #19
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Quote:
Originally posted by audio_moksha

Yes this is the driver I had in mind; seems like what Lipinski uses.And sreten, thanks so much for all the information.

I hope you can find it because it was discontinued.

http://www.tymphany.com/mg18sk09-08

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Old 9th April 2008, 04:21 AM   #20
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Default 2-WAY X-Over MG-VIFA L-Pad

You have here a good base to work on...
Attached Images
File Type: gif 2-way x-over mg-vifa l-pad.gif (9.0 KB, 1003 views)
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