For one thing, the cost to build a pair using replacement parts and building the crossovers would be exponentially higher.
P.S.- I know very little about crossover design. I am a mechanical engineering major not an electrical engineering major.
Basically, I don't want one out of 4 total drivers between the two speakers to be different than the other 3. The blend between the tweets and woofers is epic on these things. No highly resonant low-mid (4-500 Hz) hum and no excessive drop in the upper-mid (2-4 kHz) region due to the woofers inability to produce higher frequencies.
It's not like the RD0's are just some random tweeter that happens to fit. The RD0-194 was specifically designed and built to be a replacement for the SL-2000 and ONLY the SL-2000. Likewise, the RD0-198 was specifically designed and built to be a replacement for the SL-3000 and ONLY the SL-3000.
These aren't random parts that will work in a pinch; they are a labor of love on Polk's behalf to supply its customers with a superior performing replacement.
As a side note, these newer replacement tweeters ARE better than the originals. The newer replacement drivers, on the other hand, are generally less desirable than the original drivers, but I've never heard them. Some people can't hear a difference.
They really are good cones. And the one that maxes out takes a lot of low end punch to get it to do so. I just recently got a 7.1 amp with a crossover, so I just cut it below 100Hz. I'm sure they'll be fine. Thanks for the response.
The RDO-198 is the direct replacement for the SL2500 and the SL3000.
There is no Polk manufactured replacement for the HF1000 Peerless Tweeter however. You would have to source a used replacement from eBay, and be sure to match the number on the back. Polk used two versions, one made in Denmark, and the other made in the US. Your only other option for the Peerless, is the replacement/copy sold by Midwest Speaker. They claim it's an exact copy of the original Denmark design.
Ope, I forgot to edit my language. If anything goes wrong with these, I will get the RDO 194s. I hope they stay availabe for quite some time. And yeah there is an odd hissyness about these tweeters. I believe the material used to make them may be a tad to soft. Not a fan of straight up metal tweeters, but this stuff is like rubber. I tried EQ'ing down the 12-13 KHz spike, but didn't hear much improvement. It cost me quite a bit of treble. I'd love to see a graph of the frequency response of the Monitor 10 Bs, but have yet to find one.
Guys, I know I'm being highly inquisitive, but words are free. Would the 198s blend with the monitor 10 woofers? Hell, I wouldn't mind putting some of those SDA woofers in the cabinet with the 198s, however they appear to be the same woofers. Forgive my ignorance, if they aren't. Honestly, as someone who has only mid-level, at best, knowledge about it, I assert that the Polk Audio 6" woofers of this era are what really make the magic. they are the unilateral, unchanging component in this group of fine speakers with so many swappable tweeter options. The the tweeters seem to be a matter of preference, to some degree, but with the human voice, as mostly produced by the woofer, accuracy is paramount. Such a beautiful sound with properly recorded music. Thanks for all the responses guys, this is the first time I have eve posted anything to any online forum. ...iunless you count facebook as a "forum".
Regarding the 6.5" woofers, they may all look the same from that era, but there are several different models.
Ah, crossovers. I am not sure why they would age (negative connotation) more than the moving parts of the drivers. However, given that there seems to be an ever so subtle crackling int the upper mid region I am thinking tracking down a couple of crossovers would be a wise idea (seems like something I wouldn't want to get used, as it would defeat the purpose). It is indeed subtle and may be a result of using a HDD and a ASUS 660ti HDMI to push the signal of downloaded rips to my amp (which isn't that special either). Anyhow, if these components do wear I should inquire about them. Are they, also, as easily accessible as the drivers? And is there any truth to the significance or magnitude in which ferro-fluid crystallizes over time, or is that just more people trying to make assertions that they are unsure about?
PS- I have been burning in my new CS 20, and listening to 3- channel stereo. The Monitor 10s are pretty damned different. Much warmer, and flatter. The old Monitors have less response in the midbass, but definitely more pleasant to the ear. I just don't think a small ported cabinet ever sounds good with the higher bass notes. The silk/polymer tweeters of the CS really to present something that the monitors do not, but the overall sound is just less desirable to me. The transients, seem to be better on newer speakers, which I attribute to material rigidity, and should add to believabilty for HT application. I did not have the money for the A6 or a good 3-way. ...just a lil' review from a guy.
@Toolfan66: (Irrelevant comment) I am in the throws of a tool phase right now. It makes decent test music, I guess. I just know that I love them. Lateralus for the win. Was great live.
Ferrofluid does age. It's made from organic solvents, microscopic particles of, usually, iron based alloys, and a surfactant. All of these can oxidize over time, rendering the fluid useless for it's intended purpose.
I love it when comments start with "No offense, but...". These are not $100k speakers, I don't need to really become obsessed with this. It's not a hobby, I like good sounding music. I was being inquisitive, which was rather evident. If you take away the education element to these forums you just end up with a bunch of opinions and people bragging. Neither of which are important to most. If I were on a forum discussing how nuerotransmitters affect brain activity, I would not judge you for asking questions nor would I tell you you should not pursue the hobby of having a brain because you were less educated in the matter than I am. If I ever have the money to be an "audiophile" (an obnoxious term considering no one likes a crappy stereo), I may very well become one. For now, my time is best spent allocated among other things. Thank you for the information though. I did not know there were any amorphous components within a crossover.
Why are you asking the questions if you don't like or want the answers? Replacing worn and out of date parts is not being an audiophile, it's being smart, becoming educated and upgrading what is still a very good speaker. I think westmassguy explained it quite well and wasn't being the least bit derogatory. You are starting to come across a little pompous and dismissive and you're the one asking the questions.
heiney9 it's not worth the effort. If some don't want to educate themselves, that's their prerogative. I certainly won't waste anymore of my time.
Anyhow, knowing that there is a gel-like substance in the caps certainly helps me understand that they could age much faster than a coil of copper or something of the like.
It takes time for (senior) members to reply to questions with (often hard earned) experiance/information . Im new to this forum and would like to thank any and all for the time they take to share with others . Sometimes this sharing might come as tough to hear advice . Thats the senior members priviledge IMHO . These forums are fantastic and especially helpfull for us less in the know ! I bought my first polks (monitor 10b) at a garage sale for a 50$ bill ,and wow , what a revelation ! I dream... of monitor 12s . I love this hobby !
Welcome to Club Polk.
Without a feasable way to listen to both rdo tweeter versions in a a/b comparison I have to ask . If one was going through a crossover upgrade anyway , is a xover frequency change whats required to acommodate the rdo-198 in a monitor 10 . Could this be a worthy hot rod . this speaker seems to be a good choice for upgrades . just curious , thanks .
My two cents. I had SL-2000's in everything I owned. While I liked the edge they had, coming from Infinity ribbon tweeters, like the infinity's they we're fatiguing. replacing them with the RDO-194's, gave me a much more laid back natural sounding tweeter that I can listen to all day long.