SDA SRS 1.2 binding post polarity

michaeljhsda2

My friend Jerry just bought the 1.2's from Speedy and I was wondering if the binding post polarity is correct. The following pic shows the positive on the right as seen in the photo, however, the positive is on the left on my 1.2 TL's. Any thoughts? Thanks
Mike

nooshinjohn

where's the beef... I mean pictures?

Toolfan66

I think the problem is one set is original SRS's.

F1nut

Speedy advertised them as SDA SRS, do the serial number plates say otherwise?

Anyway, I seem to recall that the SDA SRS have the positive on the right, but that later versions have the positive on the left. If you want to be 100% sure (I would) pull the crossover plate and follow the binding post leads to the crossover connections, which should be marked + and -.

michaeljhsda2

Serial numbers are 5016 and 5038. I am also trying to figure out if these are 1.2's as they are pin/blade. He advertised them as SDA SRS but his signature lists them as 1.2's. I asked Speedy if I could put RDO 198's in them and he said yes (the crimp connectors on the positive wires would have to be replaced with a wider connector to accomodate the wider post). I read in the forum that way back when you could buy an upgrade kit from Polk and convert them to TL's along with replacing the tweeters with SL3000's and I'm wondering if this why Ben did the upgraded XO's.

michaeljhsda2

F1nut wrote: »

Speedy advertised them as SDA SRS, do the serial number plates say otherwise?

Anyway, I seem to recall that the SDA SRS have the positive on the right, but that later versions have the positive on the left. If you want to be 100% sure (I would) pull the crossover plate and follow the binding post leads to the crossover connections, which should be marked + and -.

Thanks, I'll check it out.

michaeljhsda2

I'm also going to pull a stereo and a dimensional MW and see what version they are. I'm hoping these can be converted to TL's....I commented in the FS thread about this possibility.

michaeljhsda2

SDA-SRS 1.2
-Small PCB crossover - yes
-Different driver rows - ?
-Cut/molded cabinet structure - yes and they have the exact same internal cross
bracing as my 1.2 TL's.
-9-screw panel(?) - Polk used spare parts from previous models as a cost cutting measure
-Blade/pin interconnect - YES!!!!!! I think these are 1.2's. Did Polk ever make a SDA SRS with a pin/blade? If not they have to be 1.2's, right?

Stereo MW is 6503

Toolfan66

If all 8 drivers are 6503's then they are SRS's not 1.2's or tl's

michaeljhsda2

F1nut wrote: »

Speedy advertised them as SDA SRS, do the serial number plates say otherwise?

Anyway, I seem to recall that the SDA SRS have the positive on the right, but that later versions have the positive on the left. If you want to be 100% sure (I would) pull the crossover plate and follow the binding post leads to the crossover connections, which should be marked + and -.

I pulled the crossover out .....and THE BINDING POST NUTS ARE ON THE WRONG POSTS!!!

Toolfan66

michaeljhsda2 wrote: »

I pulled the crossover out .....and THE BINDING POST NUTS ARE ON THE WRONG POSTS!!!

Can you post a pic of the crossovers?

michaeljhsda2

TOOLFORLIFEFAN wrote: »

Can you post a pic of the crossovers?

Yes but my camera battery just died. Give me about 15 mins. In the meantime are there any SRS's that are pin/blade?

michaeljhsda2

MW are dated 1988

michaeljhsda2

pics

michaeljhsda2

pics

kawizx9r

I found this extremely helpful when I pulled out my drivers for some treatments.

- http://www.polkaudio.com/forums/showthread.php?t=55888

I just keep it bookmarked as a reference now.

michaeljhsda2

They were definitely reversed.

michaeljhsda2

kawizx9r wrote: »

I found this extremely helpful when I pulled out my drivers for some treatments.

- http://www.polkaudio.com/forums/showthread.php?t=55888

I just keep it bookmarked as a reference now.

yes i did the same.

Toolfan66

You have 1.2's when you get the RDO 198's you will have to terminate the colored wires on your tweeters to 1/4" terminal's then you will have the 1.2tl's.

Congrats!!!

Ben did the same work on my 1.2's to 1.2tl's...

Enjoy your tunes!!!

Larry.

Toolfan66

Not sure how many hours are on those crossovers, but after about 150-200 hours you will notice a big difference in the low end, the bass will knock you back in you seat.

michaeljhsda2

Thanks for the confirmation Larry.







YAHOO!!!!!!!!!!

michaeljhsda2

When I listened to them yesterday at Speedy's they sounded awesome. I questioned the polarity but I was only able to confirm this morning that Speedy had them hooked up in reverse polarity.

Toolfan66

Also if these speakers are not spiked, Spike them don't think about it "just do it".

Also get some dynamat for the driver's, But I say spike them first you will be amazed.

Larry.

michaeljhsda2

He only listened to them a few times after Ben did the upgrade so I'm not sure how many hours are on them but they sound fantastic now.

michaeljhsda2

yes I spiked my 1.2TL's and since they are on a concrete carpeted floor it made a huge diff.

michaeljhsda2

Any concerns with running SL 2000's in them for the time being until I replace them with RDO 198's?

Face

Even if they're 1.2's, RD0-198's will not work unless you make changes in the crossover.

1.2 Schematic.

1.2TL Schematic.

michaeljhsda2

So this means Larry doesn' have TL's?

Toolfan66

michaeljhsda2 wrote: »

So this means Larry doesn' have TL's?

I have the tl upgrade,crossovers and RDO 198's, and if Ben did the same work on yours then you do as well.:cool:

Face

Technically, no. But, his crossovers were modified so they're now the same as 1.2TL's.

Toolfan66

Face wrote: »

Technically, no. But, his crossovers were modified so they're now the same as 1.2TL's.

Correct!!!:cool: and I am glad I had it done..