SDA SRS 2.3 Speakers

F1nut

The pin/blade cable is no longer available, you'll have to make one. You can do that by using standard RCA jacks with the ground jacket removed as you only need a connection from pin to pin. What are you using for power? Is it common ground?

As for the tweeters, Polk sells a far superior silk dome tweeter now called the RD0198-1. The cost is $48.00 each, if you mention that you are a Club Polk member, with free second day shipping. I'd suggest replacing all 6.

DarqueKnight

heiney9 wrote: »

Plus, if there is an error in the Compendium I'd like to make a note of it. I realize the difference between 6ohm and 8ohm nominal is negligible at best.

That is true of conventional 6 ohm and 8 ohm speakers if their response is relatively stable over their response range. SDA's, because of their dynamic interaction, are not particularly well behaved in that regard.

F1nut wrote: »

They are 6 ohm nominal. The info in the Compendium lists all the TL series as "compatible with 8 ohm outputs", which 6 ohm loads would be. Just a bit of marketing speak, I believe.

I think part of it is marketing speak and part of it is technical speak. I had some difficulty trying to pin down Polk, Inc. on exactly what "compatible with 8 ohm outputs" meant. I had never seen a speaker's impedance described in such terms before. I wanted to know why Polk couldn't just state a numerical impedance value for the TL series as they had done with every previous SDA model. They seemed somewhat reluctant to discuss the matter in detail. However, I was told that:

"The TL series SDA loudspeakers are not 6 ohm speakers and they are not exactly 8 ohm speakers due to the interaction between them. The TL series SDA loudspeakers exhibit an impedance characteristic that is comparable to that of an 8 ohm speaker over a significant portion of their frequency range."

I assume/speculate/guess that the TL's have an average impedance above 7 ohms but a little below 8 ohms over most of their frequency range and that they would more accurately be called a 7 ohm (or 7.5 ohm :eek:) speaker, particularly when the effects of interaction through the SDA interconnect are considered. However, "7 (or 7.5) ohms impedance" looks oddball on the spec sheet, hence the "compatible with 8 ohm outputs" statement. Speaker manufacturers seem to prefer even numbers for nominal impedance specs.:)

I was unable to obtain an impedance response curve for the TL series since such information was, and still is, proprietary. Stereo Review magazine, whose reviewers seemed to be somewhat fond of the SDA series, probably would have done a review of at least one of the TL speakers if they had not appeared and then been quickly discontinued during a turbulent time in the magazine's history (1989-1991). Stereo Review always discussed the impedance fluctuation characteristics of the SDA's they reviewed in the "lab tests" section of the review.

The DC resistance of my 1.2TL's is approximately 4 ohms, which is the same as the DC resistance of my (6 ohm nominal) CRS+'s and 1C's. Therefore, for amp matching purposes, and because I don't like the thought of having "7 ohm speakers", I "pretend" that my 1.2 TL's are 6 ohm nominal speakers.

Perhaps one of the EE's around here will simulate all three (or five, counting the SDA CRS+ TL mod and SDA 2B TL mod) of the SDA TL crossovers in a software program (like PSPICE) and run some response sweeps.

F1nut

Works for me.

hangon

I am powering my 2.3's with a Cinenova Grande 5-channel 300 watts. Dennon receiver (as a pre-amp). I own the Monitor 10's and I am the original owner since the 80's. I also own a pair or rti12's and a cs350 Center. Out of all the speakers, the Monitor 10's have the best sound (for now). I am going to look into the rdo198-1. Thank you polk members for all your help.

hangon

I am not having any luck getting any sound from the center Tweeters on both 2.3TL's. Does the interconnect cable have to be hooked up for them to work, or is the polyswitchs bad? I have compared them to my newer rti12's, not as bright sounding (3 bad tweeters) but they have more mid's and Low's. I am really glad I purchased them. Thank you F1nut for everything.

ns4433

drew they are in nj

deep bass

I am looking at some right now, but they are the sda srs 2.3. Just a quick question is there a difference between the sda srs 2.3's and the 2.3'tls? If so how can i tell if i see them? Is $450 too low of an offer if seller is asking $700? (cant hurt right?)

shadowofnight

deep bass wrote: »

I am looking at some right now, but they are the sda srs 2.3. Just a quick question is there a difference between the sda srs 2.3's and the 2.3'tls? If so how can i tell if i see them? Is $450 too low of an offer if seller is asking $700? (cant hurt right?)

The differences between the 2 arent life changing by any means...it does go beyond just the tweeters though...do yourself a favor and read the many threads here on the forum pertaining to those and SDA's in general...you will benefit greatly from it.

Now, offering him 450....hmmm....just be ready for the kick directed at your junk...can't hurt if you make him miss

FYI, that would be too low if they are in good shape...700 would be a good fair price. Offer him 600...that wouldnt be too insulting.

deep bass

Ok will do. He says he wants to barter. I think i will throw him a low ball offer $500(almost 30% off).

hangon

I paid $600.00 for mine not too long ago with all 6 tweeters needing to be upgraded. I seen a pair of 1.2tl's go for $3050.00 on flee bay 2 days ago. So $500-600 is what they sell for and tweeters or drivers needed.

BSUfbfan

I recently won a pair of 2.3's, and after seeing the 1.2TL's going for insane money lately, I offered him the full price of $750. The grill cloth is a little 'rough', but the speakers and cabinets are in really good shape.

With the tweeter upgrade, I am at $1050, and we will see how they sound before I attack the crossovers. Can't wait for that pallet to show up Wednesday.....

F1nut

The differences between the 2.3 and the 2.3TL are actually quite a bit. The 2.3TL's have improved tweeters with a completely different crossover design, an improved cabinet, and a completely different mid-driver set up. They sound completely different.

BTW, there never was a 1.3TL, it's a 1.2TL.

shadowofnight

shadowofnight wrote: »

..it does go beyond just the tweeters though....

Damn it Jesse....he was given a homework assignment to search the forum for the differences...and you went ahead and gave him the cheater answer :rolleyes:

F1nut

Oops, I missed that one.