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View Full Version : Help incorporating Vifa XT25TG30 dual ring tweeters with RSL Studio Monitor 3800s


davenicol
05-26-2012, 08:34 PM
I've been playing around with the idea of changing the tweeters in my Rogersound 3800's to Vifa XT25TG30 dual ring radiators to make the speakers sound more crisp and open. As they are, they sound somewhat thin.

I was able to extract the crossover from the box and draw up a schematic-it appears to be a simple 1st order network. Should I make any changes to incorporate the Vifa tweeter? Note the original tweeter is 6 ohm and the Vifa is 4.

I have limited knowledge in crossover design so any input is appreciated, thanks.

http://techtalk.parts-express.com/attachment.php?attachmentid=22981&stc=1&d=1338078750
Wolf
05-27-2012, 12:19 AM
Sounds like there is a lot that could be done to that system to improve it.

FWIW- the SC90 is not the most friendly tweeter to use, and requires a comp for the Fs as well as using at least a second order filter electrical.

BUT- the system and drivers as you already have are not known entities and it will be hard to blend the new swapped in tweeter to the existing system without knowing a lot more information.

Later,
Wolf
davenicol
05-27-2012, 01:13 PM
That's kinda what I thought. Oh well.
davenicol
05-28-2012, 02:14 PM
I've located a 1989 RSL brochure and found the crossover frequencies to be 800hz and 5000hz. With this information, can I design a HPF for the Vifa XT25TG30?

Are there any improvements that can be made to the networks?
Wolf
05-29-2012, 02:33 AM
I've located a 1989 RSL brochure and found the crossover frequencies to be 800hz and 5000hz. With this information, can I design a HPF for the Vifa XT25TG30?

Are there any improvements that can be made to the networks?

With that information, sure you could design a HPF for the XT25, but it won't be near enough information to be optimal.

Improvements to the network as it stands? Definitely. Rarely is a 1st order network with L-pad more than commercial cost savings. What you have there is a rudimentary stab at making a fool-proof speaker on the market. It'll work, but it'll never be optimal.

I'm not really trying to cut you down, or the manufacturer, but this is the case for what you have.

You'd have to give a lot more information to make these totally a better design- Starting with FR and Z plots for each of the drivers in the box sans xover.

Later,
Wolf