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Tweeter replacement recommendations

I am building an inexpensive system to place in my office. I have a Rotel rcd-971, probably getting an older (80s) Denon receiver(tuner needed), and a friend has a used pair of Paradigm Titans. It will only see low volume use.

The tweeter in one of the Titans has retired. I want to replace both tweeters. Modifying the enclosure some, is no problem.

I am thinking, since this is a place of business, the more relaxed sound of a fabric dome tweeter may be the best choice. I want to keep the cost and modifications to a minimum. The Titans have a 17mm metal dome tweeter crossed at 2.3khz, efficiency is 86db. I have browsed Partsexpress.com and found many tweeters. I like the cost and numbers for the Vifa TC 1" fabric dome, but the Morel 1 1/8" looks interesting as well.

Any ideas, pointers, or recommendations are greatly appreciated.
distortion
distortion OP
571 posts
 
Those are good suggestions, thanks so much.

I opened up the enclosure and removed the tweeter last night. It is surely dead. The crossover is very minimal. A small, but well constructed coil, and a single cap. No board, nothing fancy, anchored to the wall with a wire-tie and screw. I cant see how many Microfarad the cap is, but according the the manufacturer data it is crossed at 2.3khz/12db. So I am looking for tweeters that have fairly flat response to around 1.8khz or lower.

The tweeter is about 15mm across the driver face and appears to be a poly dome, not metal as I originally thought. From its size/construction I would surmise that it has difficulties reproducing the lower end of the spectrum that the crossover is asking it to.
clueless
763 posts
 
Its good to have a large flat freq range but there are other things you need to check too. For example, a driver will have it's own inpedance that reacts with the filter. The two component filter you have is made to work with your old tweeter's electrical characteristics.

If you look at this 2nd Order High Pass Butterworth Filter which seems to be what you describe (a cap in series with the driver and a coil accross the driver), you see in hte formula that the tweeter's inductance is part of the formula. The values of the passive components are tied to a particular tweeter's inductance at the xover point.

In any event, it has been quite a while since I did much with 2 way speakers and I ain't no expert. The point is that there a few other issues too. The forums above are good places.

Good luck
I remain,
distortion OP
571 posts
 
Thanks again Clueless, I submit that you are not nearly as clueless as your name may suggest. =) That was a great link.

I have chosen a Morel MDT-29 1-1/8" soft dome. The FS is 900hz and it appears to a good match for the 2nd order 2.3khz crossover. With flat response from 1.8khz and an SPL of 89db. Not to mention it is an exact fit in the unusual counter-sunk rear baffle mounted layout.

I will let you know how I like them after break in.
eldulcesol
197 posts
 
Distortion, if you have not purchased the tweeters yet, check out the Kinima tweeters that are for sale on ebay. These are a fabric dome tweeter used in the Kinima G1 speakers from Zetag corp. They are only $35 and probably the best you will find under a $100.

Go to ebay, Kinima, click G4. Go to the sellers store for info. I have purchased speakers, drivers and parts from him and they are the best you can get for your project. Check out the spec sheet for info.
distortion OP
571 posts
 
Thanks for the info Eldulcesol. I placed the order with Partsexpress just before posting. They do have a full refund return policy. If the Morels dont cut it, I can always return them.
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