Anyone replace the RDO194s with a Vifa on a Polk RTA-12C?

[jon s]

As some of you may know, I have a pair of Polk RTA-12Cs with RDO-194 tweeters and all caps replaced with Sonicaps. I was just wondering if it would be a good idea to replace the RDOs with Vifa tweeters. I have a spare set of Vifas which are lying around the house collecting dust. Any ideas? Thanks in advance.

:confused:

http://www.polkaudio.com/forums/attachment.php?attachmentid=33958&d=1213933376
http://www.polkaudio.com/forums/attachment.php?attachmentid=34262&d=1215904506
http://www.polkaudio.com/forums/attachment.php?attachmentid=34403&d=1216516237
http://www.polkaudio.com/forums/attachment.php?attachmentid=34405&d=1216516237

[engtaz]

Try it and report back to us on how it went.

Thank,
engtaz

[george daniel]

eh,, nope.

[Face]

No, especially with the complexity of that crossover.

[ben62670]

Keep the RDO's, and send me the Vifa's;) The XO would most likely not play well with Vifa's. Most Vifa tweeters are 4ohms, and even if they were six the XO wouldn't match up well.
Ben

[jon s]

Well, i measured my Vifas and they were 6-ohms. Measured the RDO194s and they were 10-ohms??? Swapped the drivers out and there was a noticeable change. There was a substantial drop in the HF response, I'd say about 6-8 dB. Cymbals literally vanished on some recordings. I would have thought with less resistance the Vifas would be too loud. The only thing I can think of is that the Vifas are a lot less sensitive than the RDOs... Oh well... back to the RDOs.

[ben62670]

You need a new meter. The values are way off;) IRC the 194's DCR is about 5.6, and most Vifa's are around 3.5.

[engtaz]

or new battery. When readings are suspect, low battery voltage on battery.

engtaz

[skrol]

Could be the meter if it is out of calibration or low quality. I have a $7 Centech meter and a Fluke 187. The Fluke measured my 1.5 ohm 1% resistor as 1.53 ohms. The Centech measured it as 2.54 ohms.

[ben62670]

I have some centechs. I use them for auto stuff, and non critical stuff. If it gets dropped who cares::

[dudeinaroom]

could also be the probes. ....edit....I had a pair that were a little corroded had fun trying to get a reading with. Also had a pair that the nickel plating (or what ever metal it was) had worn through and the worn spot that would yield a different reading.