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Multi-Way Conventional loudspeakers with crossovers

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Old 27th April 2013, 02:06 AM   #1
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Default didn't get it right

We have an old Focal 6.5 6V3211B at 8 ohms to match with a Vifa XT19TD00-04 at 4 ohms (but both are an 89 SPL.) Anyone here able to design the crossover and what would the cost be to build the pair?
Vifa XT19TD00-04 3/4" Dual Radiator Tweeter

The Vifa XT19TD00-04 features a patented dual concentric diaphragm and a unique waveguide center plug that provide an excellent on-and off-axis response. This tweeter is acclaimed for its very natural sound with an extremely smooth frequency response extending well beyond the human hearing range. The dual chamber design and absence of ferrofluid results in a low resonance frequency.
Specifications: Power handling: 90 watts RMS/140 watts max VCdia: 3/4" Impedance: 4 ohms Re: 2.9 ohms Frequency response: 1,500-40,000 Hz Fs: 681.9 Hz SPL: 89 dB 2.83V/1m Dimensions: Overall diameter: 3.70", Cutout diameter: 2.70", Depth: 1.08".
and the Focal..6V3211B Focal Woofer.pdf
Thanks in advance
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Old 27th April 2013, 03:19 AM   #2
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Hi, pick any assembled crossover for car audio - They're for 4Ω speakers
You'll have to increase the inductance for the woofer, thou...

Edit: I don't know that tweeter, but reading 'No ferrofluid' means that a minimum
power conservative cut above 2 KHz with a 2nd order slope should be chosen

Last edited by picowallspeaker; 27th April 2013 at 03:24 AM.
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Old 27th April 2013, 05:19 AM   #3
balerit is offline balerit  South Africa
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You cannot mix 4 ohm with 8 ohm speakers.
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Old 27th April 2013, 11:16 PM   #4
pkitt is offline pkitt  United States
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Default Really????

Don't know where you've been living for the last several decades but you certainly can use drivers with different impedances as the crossover design takes that completely into account.
Paul

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You cannot mix 4 ohm with 8 ohm speakers.
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Old 28th April 2013, 05:43 AM   #5
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thanks pkitt; maybe he is thinking of something else in South Africa or doesn't realize his mistake, oh well....

I'll post a pic of the Vifa part of the crossover tomorrow, but the Focal I'm having trouble with as I try to match these up....thinking Bessel
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Old 28th April 2013, 08:43 AM   #6
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by audio4him View Post
....thinking Bessel
I'm thinking butterworth, as below but I've really no idea what the levels will be. 15 litre closed box for sure though and you'll need to deal with fibreglass cone breakup....

Troels has done a few designs for the similar XT25 tweeter.
Peerless projects

He puts a resistor in series and uses third order to protect the undamped tweeter Fs.
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File Type: png Vifa_XT19_6InchBass.PNG (7.4 KB, 389 views)
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Old 28th April 2013, 01:24 PM   #7
pkitt is offline pkitt  United States
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I forgot to mention that I've used the XT19 in two designs and it's a great tweeter, performing above its pay grade, actually.
Paul

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thanks pkitt; maybe he is thinking of something else in South Africa or doesn't realize his mistake, oh well....

I'll post a pic of the Vifa part of the crossover tomorrow, but the Focal I'm having trouble with as I try to match these up....thinking Bessel
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Old 28th April 2013, 08:47 PM   #8
balerit is offline balerit  South Africa
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Quote:
Originally Posted by pkitt View Post
Don't know where you've been living for the last several decades but you certainly can use drivers with different impedances as the crossover design takes that completely into account.
Paul
I have been designing crossovers and writing books on the subject for 20 years, show me one source that says you can.
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Old 28th April 2013, 09:13 PM   #9
pkitt is offline pkitt  United States
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Every single speaker manufacturer has successfully designed and produced speaker systems for years that use drivers having different impedances. In fact, its almost impossible not to do so, especially when paralleling drivers, like for the midwoofers in an MTM or when using a pair of woofers in a 3-way. Also, many, many tweeters are inherently 6-ohm drivers, while midranges and woofers are either 4-ohm or 8-ohm, or somewhere in between. Really, you're either fooling yourself if you believe what you're saying, or you must think the rest of the world is very gullible to give any credence to what you say, no matter how many years you've been doing that. Or, you're just a troll.
Paul

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I have been designing crossovers and writing books on the subject for 20 years, show me one source that says you can.
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Old 28th April 2013, 11:04 PM   #10
Shaun is offline Shaun  South Africa
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Quote:
Originally Posted by balerit View Post
You cannot mix 4 ohm with 8 ohm speakers.
What is your reasoning?
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