SDA-1C in my living room...

nooshinjohn

i got the sda 1c today and am happy to report all is well
they have never been opened up except for butchered binding posts
already redid them... any andvice or suggestions for enhancing enjoyment of these great speakers?
also are they 4ohm or 8ohm?

thanks
john

inspiredsports

http://www.polksda.com/sda1creview.shtml

It should be a 4 ohm set. Schematic is in the SDA Sticky at the top of forum.

ben62670

New caps and resistors:)
http://www.polkaudio.com/forums/showthread.php?t=55888

inspiredsports

inspiredsports wrote: »

http://www.polksda.com/sda1creview.shtml

It should be a 4 ohm set. Schematic is in the SDA Sticky at the top of forum.

You might want to pop the passive radiator to get an eyeball on the crossovers to make sure they match the schematic values if you are going to do the highly recommended crossover upgrade. Some are also upgrading the Interconnect Connection to Cardas and going with custom silver wire based Interconnect Cables with superior results

inspiredsports

Lasareath wrote: »

Congrats!

They are 6ohm. . .

Hi Sal,

Do you have a manual or something other than what I referenced. It's confusing in that it shows nominal 4 ohm, low of 3.9 ohms, but 6 ohms over much of the range.

ben62670

The 1C is 6ohms nominal.

george daniel

What did the previous owner do to the binding posts?

nooshinjohn

:)the binding posts were broken off, missing the plastic lock nuts and basically abused. I replaced them with banana plug posts and replaced the original sda terminals with an rca jack. my next step is to replace the top and bottom caps with solid cherry wood caps with a piano gloss finish and recover the grills. as far as the side panels i was thinking about running a strip of cherry from top to bottom about 6 inches wide on the back edge and recovering the remaining side area with grill cloth.

as far as the ohm rating, just so i understand, they are four ohm speakers on mon/wed/fri and 6ohm on tue/thu/sat and sunday should be a day of rest?

thanks for your assistance and support guys:p
john

nooshinjohn

the manual for the 1b shows 5ohm....

heiney9

nooshinjohn wrote: »

the manual for the 1b shows 5ohm....

1B's and 1C's are not the same. They use different drivers.

Why the concern about what the Ohm rating is?

They are 6 Ohm nominal. They do go lower in the lower frequencies but as the word nominal means................the rating is an average over the entire freq range.

H9

P.s. Did you read the article link in post #2; that will answer your question plus a whole lot more.

nooshinjohn

i want to be certain that I am running them properly, as my yamaha reciever is currently set to 8ohm...
.............................................lol i know already.... new amp!

heiney9

nooshinjohn wrote: »

i want to be certain that I am running them properly, as my yamaha reciever is currently set to 8ohm...

That Yammy won't do them justice. I know it's all you have right now but don't play it too loud and start saving for better amplification. The 1C's will open up and sound 100 times better with quality amplification and a receiver just won;t do them justice.

Enjoy

H9

P.s. You beat me to it. The Yammy will work in the mean time, just don't play it too loud

ben62670

Set your Yammi to 4 ohms till you replace it.

nspindel

nooshinjohn, My 1C restoration thread:

http://www.polkaudio.com/forums/showthread.php?t=70931

vlam

I just sold my Lsi15 this weekend and was finally brave enough to move my 1C to the living room. My wife didn't freak out but I was very pleased with how they sound. I got 1C months ago and never even attemp to hook them up. Mine are stock but in very good condition. I can't even imainge what they sound like upgraded.

nspindel

vlam wrote: »

I can't even imainge what they sound like upgraded.

I've done tweeter/xo upgrades on two sets of SDA's so far, and the improvement is spectacular.

Face

nspindel wrote: »

I've done tweeter/xo upgrades on two sets of SDA's so far, and the improvement is spectacular.

I couldn't agree more.

nooshinjohn

here are some pictures and information...
near as i can tell they were build in february of 1988 as indicated by the inspection marks on the drivers. the serial # for left is 8331/8271 right...
both cabinet tags state sda1, and no reference made to a,b or c models
the crossovers are quite large and rectangular in shape as shown in the pictures.... ok how the @#!$ do I upload pictures... they are all about 2meg and the system allow 512k. how do i get them into a submittable format?

thanks as always

Face

nooshinjohn wrote: »

ok how the @#!$ do I upload pictures... they are all about 2meg and the system allow 512k. how do i get them into a submittable format?

This will allow you to resize, crop, etc...

http://www.irfanview.com/

nooshinjohn

thanks for the help in getting the images formatted properly...

ben62670

I use photobucket to upload my pics. Then I just take and insert the link into the add image button. This works very well.
Ben

nooshinjohn

nspindel said these might be sda1b's... any ideas?

danger boy

they are 1C's

they are one of the more desirable SDA 1's

nspindel

nooshinjohn wrote: »

nspindel said these might be sda1b's... any ideas?

No, I didn't mean for you to think that you had 1B's. When you described your XO to me, I said that it sounds like my 2B XO.

nooshinjohn

sorry... my mis-understanding

nspindel

That's a complete different XO than my 1C's.

nooshinjohn

perhaps f1-nut or another of our resident gurus has some input?

Face

Wtf, looks like a PB SRS2 crossover.

nspindel

It's definitely the same board as my 2B XO, although I see a cap in the C2 position, and resistors in R2 and R3 that aren't present in the 2B's. Here's one of the XO's I pulled from the 2B (before I started taking it apart):

nspindel

Also looks like there are two extra inductors, one in the location where mine has a ceramic resistor standing up next to C5.

Face

P/B SRS 2.