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Old 5th November 2004, 09:42 AM   #1
Puggie is offline Puggie  United Kingdom
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Default Vifa XT25 (Probably repeated questions, but I did search first)

I may be getting a pair of these reasonable cheap for a mini monitor project. I've read a few posts saying how the XT25 requires complex Xovers to get the best from it and one thread about glue mods to the unit. I've searched but not found a conclusive answer.

Could someone enlighten me to what this tweet needs to get the best from it? What sort of crossover (slopes and point) will it cope with and what extra filtering is required to get really good results from it. I'll probably be partnering it with 6" Peerless HDS mids, Audax aerogels, Seas or something similar, either 5 1/4 or 6 1/2 mids in very small ported boxes.

Thanks people.
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Old 5th November 2004, 10:15 AM   #2
Thomas is offline Thomas  Denmark
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Hi

I posted a question just like that years(?) ago here.

My question is post #26.

Thanks to Sreten, Hugh and Navin my speakers realy 'sings'.

18dB butterworth for both drivers crossed at (not below) 2500Hz did the trick for me. The X25 needs a impedance correction network as well.
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Old 5th November 2004, 11:55 AM   #3
Puggie is offline Puggie  United Kingdom
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Excellent, I was planning on 18dB / Oct Butterworth slopes at 2.2kHz, so I should be able to nudge that up to 2.5kHz without and grief. I'm partnering them with 8s that are good upto about 3.5kHz, so should be fine. Just remember to use a Zobel with them.
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Old 5th November 2004, 09:20 PM   #4
Vince35 is offline Vince35  France
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Hello,
Quote:
The X25 needs a impedance correction network as well.
What kind of impedance correction would you use for the XT25 ?

Vincent
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Sorry if my english is bad...
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Old 7th November 2004, 02:15 PM   #5
Thomas is offline Thomas  Denmark
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Quote:
Originally posted by Vince35
Hello,

What kind of impedance correction would you use for the XT25 ?

Vincent
I can't remember the values any more. I meassured the actual values on mine and calculated the component values from there. According to the datasheet the XT25 have a impedance peak arround 550Hz. I think you can rely on the values given.

Link to online calculator:

http://www.carstereo.com/help/Articles.cfm?id=23
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Old 16th November 2004, 04:12 AM   #6
madinoz is offline madinoz  Australia
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I wouldn't start doing physical mod's to the XT25 unless you saw some burning need to.
I have used this tweeter a number of times. I did use it with a 2nd order crossover at about 4000hz to good effect. The requirement for a steep crossover slope would probably only come into effect if I was building a speaker required for high SPL listening levels.
The impedence correction filter should allow the use of a lower order crossover and will clean up the tweeter's response.
PS Listen to the XT25 dirctly on axis when testing the crossover, the off axis response falls off quite sharply!
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