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#1 |
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diyAudio Member
Join Date: Sep 2005
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#2 |
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diyAudio Member
Join Date: May 2005
Location: Californication
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Hi RDV,
The new tweeters Fs is around 1.6KHz so IMO wouldnt run them much below -3dB at 2*Fs unless a very large order highpass filter is in effect. Seems there are much lower Fs tweeters to be had for not much more $.
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like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust |
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#3 |
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diyAudio Member
Join Date: Sep 2005
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Isn't the Fs too high to let you use them from 1600Hz ?
Fs: 1,579 Hz is stated on the parts express website. What are the LF speakers? |
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#4 |
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diyAudio Member
Join Date: Jul 2003
Location: Seattle, WA
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Same price, same brand, proven track record.
http://www.partsexpress.com/pe/pshow...number=276-152 |
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#5 |
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diyAudio Member
Join Date: Sep 2005
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They're going in some bookshelf speakers with a 6.5 woofer.
Someone gave me the speakers with drivers completely shot out. I just bought some cheap drivers from Parts Express but the tweeters aren't performing as well as woofers(which I thought were amazing for $10.00) so I thought I'd upgrade a bit. If I were getting a better x-over too, I would just go with some high-end drivers but the cabinets don't really rate that. The original tweeter(cone) was 6 ohms so I'm trying to stay there. I don't even know where exactly the x-over is set on these. They sound pretty good with my DIY LM3886 amp though. RDV |
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#6 |
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diyAudio Member
Join Date: Apr 2006
Location: Midlands
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RDV , it is best to choose a tweeter which has its Fundamental Resonance at least 1 octave below the crossover frequency you wish to use . For use from 1600 , use a tweeter with 800Hz or lower Fs . There are plenty of such to choose from . Even with 1 octave below you will need to use a crossover with a slope greater than 6dB/octave , or you will get distortion - look at the resonance on the Audax data sheets in those links - how long it extends for . If you want to use a single capacitor , 6dB slope , then use a tweeter which has Ferro-fluid to admp its Fs . best wishes , Alan .
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Alan |
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#7 |
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diyAudio Member
Join Date: Mar 2003
Location: adelaide city of churches
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we all have problems only some people have more than most.... long live the Magyar (Hungarians) in the world! |
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#8 |
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diyAudio Member
Join Date: Sep 2005
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I'm a newbie to DIY Hi-Fi audio so I had to look up what Fs means. I think I understand the concept of 'free air resonance' now.
My thing's been building DIY guitar effects, I'm having to learn a new language. RDV |
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#9 |
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diyAudio Member
Join Date: Sep 2005
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I wonder why the .75" supposedly goes lower than the 1"?
Even though the Fs is much lower on the 1". Doesn't seem right to me. RDV |
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#10 |
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diyAudio Member
Join Date: Jul 2003
Location: Seattle, WA
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2200Hz is the -3db point. It will play to Fs if you push down the top end and use a steep slope at the bottom.
As you be a newbie that is probably pretty cryptic. To put it simply, the only way you're going to be able to do a drop in replacement without modding the crossover is to find a tweeter with the same parameters as the unit your replacing. That is more involved than matching impedance. |
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