Info on orig. SRS, 1.2, 1.2TL? Differences?

tubino

I'd love to read what the differences are. Can anyone direct me to a document?

This isn't just curiosity. I'm weighing purchase of a pair of original SRS!

woofiepaws

Check out the Search function here on the Forum. You'll learn tons. I know I did, and still do.

And, Welcome!

Ricardo

You might find something using search; There are differences in crossovers, drivers and cabinets, so there is difference in the sound. The 1.2 TL's being "the best", though as with everything, some people like tyhe SRS's better.
The SRS's have the SL2000 tweeters, that you would want to change for the new silk replacements. That's $500 right there.

$1,500? Thy would have to be in absolutely perfect condition. I would offer less.

tubino

Ricardo wrote: »

The SRS's have the SL2000 tweeters, that you would want to change for the new silk replacements. That's $500 right there.

$1,500? Thy would have to be in absolutely perfect condition. I would offer less.

THANKS! I am using the search function, but can't seem to hone in on what I'm looking for. Will continue though.

Very interesting about the tweeters. Are these silk tweeters readily available?

tubino

Seller claims they are in top condition. I was planning to take along my laptop and Woofer Tester 3, which plots an impedance graph for ya in about 2 seconds.

Ricardo

tubino wrote: »

THANKS! I am using the search function, but can't seem to hone in on what I'm looking for. Will continue though.

Very interesting about the tweeters. Are these silk tweeters readily available?

Yes, Polk sells them.

tubino

Thanks for the help, guys! So when I check these out, are there particular things I should look for? Are some of the drivers susceptible to foam rot, for example?

And do you SRS guys put these against the wall, or pull out like usual speakers for better soundstaging?

tubino

Lasareath wrote: »

If they are indeed in mint condition then I would say you should buy them. These are rare speakers ...

It might wind up being all your fault, you know!

Did you know that anyone googling SRS speakers WILL find your site, without a doubt? GREAT JOB restoring those speakers, BTW!

shadowofnight

I owned a pair 1.2tl's when they were new...had them maybe 5 years and sold them ( Kicks self in ****...I was young ) ...but I recently picked up a mint pair of SRS's and after I did the crossover upgrades I am not missing my tl's one bit...these really sound good. If they are in great shape ...grab them.

shadowofnight

tubino wrote: »

Thanks for the help, guys! So when I check these out, are there particular things I should look for? Are some of the drivers susceptible to foam rot, for example?

And do you SRS guys put these against the wall, or pull out like usual speakers for better soundstaging?

No foam...all rubber surrounds

tubino

shadowofnight wrote: »

I owned a pair 1.2tl's when they were new...had them maybe 5 years and sold them ( Kicks self in ****...I was young ) ...but I recently picked up a mint pair of SRS's and after I did the crossover upgrades I am not missing my tl's one bit...these really sound good. If they are in great shape ...grab them.

These crossover upgrades... is it mostly a matter of using higher quality capacitors, same values? I'm not usually so 'needy' about information (I'm usually more patient about scouring archives instead of asking for it), but because I'm in this town such a short time, I'm going to have to make a snap decision, very soon, for a good chunk o' change... so help is greatly appreciated!

shadowofnight

tubino wrote: »

These crossover upgrades... is it mostly a matter of using higher quality capacitors, same values? I'm not usually so 'needy' about information (I'm usually more patient about scouring archives instead of asking for it), but because I'm in this town such a short time, I'm going to have to make a snap decision, very soon, for a good chunk o' change... so help is greatly appreciated!

Same values...better quality...especially since the electrolytics are so old...worth the money fo sho

george daniel

Lasareath wrote: »

That is exactly correct. Or least we try to get the same values. There are a couple of items that have been removed and some people claim that this improves the sound.

^^^what he said^^^^,and be sure to call Jeff @ sonicraft.;)

cambir

I've never owned anything close, but there might be some helpful info here:
http://www.polksda.com/

I-SIG

The thing about the SRS's is that you MUST use common ground amps or amps that can be made common ground, i.e. strapped JC-1 mono's. That's the only thing I hate about my SRS's is the limited choices on amps. I'd love to try the ICEpower units or the big damn MF integrateds that F1 and Hearing are running.

Wes

DarqueKnight

Just buy or build an AI-I interface cable and plunge right into the world of non-common ground amps.

Ricardo

I don't think you can use the interface for non-common ground amps with the original SRS's; at least not the "stock" one.

DarqueKnight

You can't. My mind thinks of the 1.2 and 1.2TL's as SRS's also.

tubino

I think every amplification option I own is common ground. But now that I am going to be parking these things in my house (and they are NOT the largest speakers I own, by a LONG shot!), I'm wondering how much power these things really want and need? Will 30 class A (SE 845) watts do it? 60 PP tube watts? After that, I haven't got much in the way of QUALITY... Anyone using tubes with these? Are they around 91db/1w/1m?

DarqueKnight

Original SRS Specifications:

Driver Complement: Four 1 inch SL2000 silver coil dome tweeters
Eight 6-1/2 inch trilaminate polymer bassmidrange drivers
One 15 inch fluid-coupled subwoofer

Size (inches): 63-1/2H x 21W x 13D

Weight Per Cabinet: 182 pounds

Frequency Response: 10 Hz to 26,000 Hz

Recommended Amplification: 10-1000 watts/channel

Crossover Frequency: 45 Hz and 2000 Hz

Nominal Impedance: 4 ohms

Maximum Output Level:125 dB

Efficiency: 93 dB

1985 MSRP: $1295 each (equivalent to $2515 each in 2007 dollars)


Here is a thread you may find useful: Differences in SRS models

There are others also.

tubino

DarqueKnight wrote: »

Frequency Response: 10 Hz to 26,000 Hz
Recommended Amplification: 10-1000 watts/channel
Maximum Output Level:125 dB
Efficiency: 93 dB

Frequency response of TEN hertz??? WTF? How many db down at, say, 20?
125 db output??? That gives my Tannoy DMT 15's a run.
Efficiency 93, impedance always over 4 by my measurements... rated min power is 10 watts... These might work GREAT with an SE 845 amp.

I'm not sure if these will be my all-time favorite speakers (I'm coming from a very different sound, with Tannoy dual concentric point source...), but one thing is for sure: these Polks sure draw a friendly generous bunch. Thanks for all this help, guys!

ben62670

I like the SRS model more than the TL Models with some modification. I know I may get blasted for that comment, but I like the 4 ohms, and 93db efficiency. If you own speakers of this magnitude you need good amplification. With 4ohms instead of 6ohms, and a 2db of efficiency over the TL's you just basically added 50% to your amps power for free.
I know this isn't a huge difference, but a lot of people like to get some serious DB every once in a while.
One of the advantages of the TL versions is a simpler XO in the dimensional department. The SRS uses very large caps in the Interconnect department (260uf) not cheap with aftermarket caps. IF you do the XO upgrade (I highly recommend you read up on it) at least use new cheap caps for the 260uf's.

DarqueKnight

tubino wrote: »

Frequency response of TEN hertz??? WTF? How many db down at, say, 20?

I have never seen the -3 dB limits for the SRS published in any of Polk's sales literature or in the SRS manual. Stereo Review measured the SRS during a detailed review and said: "The composite frequency response was flat within +/- 4.5 dB from 20 to 20,000 Hz.". A copy of this review is posted at the www.polksda.com website.

The -3 dB limits for the SRS 1.2 were 27 and 20,000 Hz. The -3 dB limits for the SRS 1.2TL were 27 and 25,000 Hz.

tubino

Lasareath wrote: »

Post some pics of your gear, we love to see other people's gear.

My 1.2tl's with 600watts per channel move my internal organs.
l

These cabinets with Tannoy Monitor Gold 15s will produce 100db+ of clean music, on a few watts, and the drivers display almost ZERO cone excursion even at 110db:


The backloaded horn loads the driver so effectively that it is loafing along at 110db. Excursion is sometimes presented as a positive thing, as if more is better. It's okay if the driver can do it, but actually doing it always means more distortion, so it's even better if the driver NEVER has to have much excursion to produce SPL's. I'm not afraid to make cones move generally, but the honest truth is that I believe I would probably damage household items if I ever cranked it to that point with Tannoy 3833 drivers in those cabinets. I got crazy (120db) loud with them, and STILL the cones barely moved.

I'll do more in a self-introduction thread.

tubino

Ricardo wrote: »

I don't think you can use the interface for non-common ground amps with the original SRS's; at least not the "stock" one.

Okay, now I own a pair of original SRS, and want to use them with non-common ground amps. The speakers have the original cable, with a pin/blade connector. I see the AI-1 cable instructions, and am able to make it... but will it work? I'm still looking for info on common ground vs non-comm ground, links much appreciated.

danger boy

tubino, what amp are you looking to use with the SRS's? if they are original SRS"s then they would have the blade/blade connector. which i'm pretty sure you can't use the AI-1 cable with .

tubino

Hi, thanks for the reply. I was going to use a pair of mono tube amps, but will just hook up a good solid state with common ground. If the snow doesn't get too deep, it might be this weekend... I left the speakers at a friend's house! You don't move them on a whim.

Yes, these have the blade/pin type connection.

F1nut

If you have a pin/blade cable and socket, you don't have the original SRS's.

tubino

F1nut wrote: »

If you have a pin/blade cable and socket, you don't have the original SRS's.

Well, as I've demonstrated here repeatedly, I don't know diddly about Polks. But all help is appreciated! Can you tell what I have from this (serial number legible):



Or maybe this helps:



Full frontal assault:

F1nut

Always glad to help. You have the blade/blade cable as indicated by the interconnect cable diagram on the label, therefore you do have the SRS's. No mono block, dual mono or non-common ground amps for you.

tubino

F1nut wrote: »

Always glad to help. You have the blade/blade cable as indicated by the interconnect cable diagram on the label, therefore you do have the SRS's. No mono block, dual mono or non-common ground amps for you.

But but but.... true, the diagram shows two flat or rectangular-looking slots, but the reality is that the male ends of the connecting wire include a perfectly tubular pin and a flat one. Go figure. Too bad I didn't take a picture, and the units are 15 miles away from me.

But what is different here to prevent use of an isolating transformer... ?

Oh well, I'll just try them out with an ordinary amp and the stock cable.

Thanks for your help!