Hi,
I have a pair of 2 way bookshelf speakers and one of the tweeters was physically damaged by my friends kids.
I opened it up the speaker adn teh tweeter is a vifa D20TD-05-06 3/4 soft dome. I think it is available but i would not mind upgrading the tweets in both speakers.
I am open to suggestions but want to stay below say $45 dollars each tweeter.
D20TD-05-06 specs
Voice coil resistance [ohm] 4.2
Sensitivity [dB] 89
6 ohms *DC resistance: 4.2 ohms *Fs: 750 Hz *SPL: 89 dB 1W/1m Free air resonance [Hz] 1700
I was already planning on building new cabinets for these speakers so it does not have to match in size.
According to the manufacturer my speakers are crossed over at 2500Hz
i was looking at PE site and there are some 1 inch soft domes i thought i could try.
like VIFA PL27TG-35-06
6 ohms *DC resistance: 4.6 ohms *Frequency range: 1,500-25,000 Hz *Fs: 750 Hz *SPL: 91 dB 1W/1m
Could i just pad this down a bit to because of its greater sensitivity? Or does its higher DC resistance cause more problems.
the tweeter section of the crossover seems simple with a 3.9uF cap in series and an inductor parallel. not sure of the inductor value i will try to get them measured.
good ideas or suggestions apreciated.
I have a pair of 2 way bookshelf speakers and one of the tweeters was physically damaged by my friends kids.
I opened it up the speaker adn teh tweeter is a vifa D20TD-05-06 3/4 soft dome. I think it is available but i would not mind upgrading the tweets in both speakers.
I am open to suggestions but want to stay below say $45 dollars each tweeter.
D20TD-05-06 specs
Voice coil resistance [ohm] 4.2
Sensitivity [dB] 89
6 ohms *DC resistance: 4.2 ohms *Fs: 750 Hz *SPL: 89 dB 1W/1m Free air resonance [Hz] 1700
I was already planning on building new cabinets for these speakers so it does not have to match in size.
According to the manufacturer my speakers are crossed over at 2500Hz
i was looking at PE site and there are some 1 inch soft domes i thought i could try.
like VIFA PL27TG-35-06
6 ohms *DC resistance: 4.6 ohms *Frequency range: 1,500-25,000 Hz *Fs: 750 Hz *SPL: 91 dB 1W/1m
Could i just pad this down a bit to because of its greater sensitivity? Or does its higher DC resistance cause more problems.
the tweeter section of the crossover seems simple with a 3.9uF cap in series and an inductor parallel. not sure of the inductor value i will try to get them measured.
good ideas or suggestions apreciated.
ok well i might just try it without advice.
I am a better wood woker than audio circuit designer and i will be gluing up some cabinets i cut yesterday. I just need to decide if i will change tweeter or not so i can route the speaker recesses and holes
If i change tweeters i understand that some crossover adjustments may be needed. So i am looking for close match in dc resistance, sensitivity (but i understand how to l-pad so not critical).
what im not sure about is Fs? how will this effect choice for a tweeter?
I also will try to find a similar impeadance curve. I am assuming that the Impeadance should match well around the crosover frequency and beyond that not make much difference. Am i correct??
I am a better wood woker than audio circuit designer and i will be gluing up some cabinets i cut yesterday. I just need to decide if i will change tweeter or not so i can route the speaker recesses and holes
If i change tweeters i understand that some crossover adjustments may be needed. So i am looking for close match in dc resistance, sensitivity (but i understand how to l-pad so not critical).
what im not sure about is Fs? how will this effect choice for a tweeter?
I also will try to find a similar impeadance curve. I am assuming that the Impeadance should match well around the crosover frequency and beyond that not make much difference. Am i correct??
personally I would be trying to find a tweeter that is as close to the original in sensitivity, FR, and impedance as possible. Vifa still makes D19/20 series tweeters as far as I know, so you should be able to find a drop in or close to replacement. If you try to upgrade without any measurement/design capability, you could as easily degrade the sound as improve it IMHO.
thanks for your thoughts
i just might by the direct replacement.
I dont mind playing aroung with the crossovers though because a couple of years ago i totally rebuilt the xovers. I just copied the originals with quality components but split out the tweets and woofers to biwire.. (I had te electronics shop where i used to work measure the coils). I have many resistors from trying differnt pads on my car tweeters.
As far as messing up the original sound am i correct as follows?
Lets say my xover is 2500hz and the original and replacement tweeter both have flat response and similar impeadance in the region then it would be a pretty good match.
but voice coil resistance is higher on the replacement. this will shift the xover to higer frequency right?
what im sure i dont know is how Fs effects things if it does?
ehh if i screw it up ill just put the old ones back together give them to my brother and start a project aroung the new tweeters
i just might by the direct replacement.
I dont mind playing aroung with the crossovers though because a couple of years ago i totally rebuilt the xovers. I just copied the originals with quality components but split out the tweets and woofers to biwire.. (I had te electronics shop where i used to work measure the coils). I have many resistors from trying differnt pads on my car tweeters.
As far as messing up the original sound am i correct as follows?
Lets say my xover is 2500hz and the original and replacement tweeter both have flat response and similar impeadance in the region then it would be a pretty good match.
but voice coil resistance is higher on the replacement. this will shift the xover to higer frequency right?
what im sure i dont know is how Fs effects things if it does?
ehh if i screw it up ill just put the old ones back together give them to my brother and start a project aroung the new tweeters
What size mid??
if 4" or less, maybe the OW1 (or whatever the 19mm Hyq is called) would be a possible improvement.. although I have not used it myself, it does get raves form lots of fellow DIYers. Other than that , I'm not sure what else is available that might be considered an upgrade from a D20.
you could go to a 25mm tweet, of which there are several pretty good ones at reasonable prices
if 4" or less, maybe the OW1 (or whatever the 19mm Hyq is called) would be a possible improvement.. although I have not used it myself, it does get raves form lots of fellow DIYers. Other than that , I'm not sure what else is available that might be considered an upgrade from a D20.
you could go to a 25mm tweet, of which there are several pretty good ones at reasonable prices
i was thinking going to a 25mm, the woofer it will mate with is a 6.5" cant tell what make/model
i think i may buy much nicer tweeters play around with them a bit for now and use them in a future established design or kit.
maybe scanspeak d2905/9500 lots of prjects done with these
or Usher 9950C-15 tweeter
there is a 3way (Exodus Audio 641)wth this amd extremis woofer that looks good to me
http://diycable.com/main/default.php
but for use now these are 8ohm not six like my d20
i think i may buy much nicer tweeters play around with them a bit for now and use them in a future established design or kit.
maybe scanspeak d2905/9500 lots of prjects done with these
or Usher 9950C-15 tweeter
there is a 3way (Exodus Audio 641)wth this amd extremis woofer that looks good to me
http://diycable.com/main/default.php
but for use now these are 8ohm not six like my d20
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