SDA 1's not A,B,or C sound bad

[Gary Batson]

I'm the original owner of a pair of Polk SDA 1's bought in 1983. These speakers have been in storage for more than 15 years. But now I want to hear them again in a surround setup. I've set them up for a listen and love the SDA effect, But the speakers just don't sound good. I know these are great speakers and I'm not going to give up on them. So I need your help .
I've read a lot of threads. So I know there are people here that know their stuff about these speakers.
This is what they sound like. The bass is deep and has texture. It'll surprise you sometimes. But theres not much of it. Compared to the rest of the speaker the bass is almost nonexistant. The midrang is probably OK. But it's hard to tell because the upper midrange/lower trebble is so excessive. It's earpiercing at higher volume. The tweeters sound good though. Cymbals and the like sound crisp, clean, clear, and natural.
These speakers look mint. But are unbearable to listen to for any length of time.
What's wrong??? I need advise from someone who's smarter than I am.

By the way, The speakers are wired in phase.

[Lasareath]

Hello Gary. Welcome to the Forum.

Try to listen to one speaker at a time without the Interconnect Cable plugged in at all.

Let's see wether or not it's both speakers or if it happens with the IC cable plugged in or not.

And then we can move on from there.

Las

[ben62670]

I had the same problem with my original 2's. I disconnected my sda tweeters, and replaced the resistor in the stereo tweeter with a lower value. It made a world of difference.

Welcome to Club Polk
Ben

[Gary Batson]

OK; Good to hear from both of you!!! I disconnected the interconnect cable and the sound was still the same (still earpiercing) except the SDA side wasn't working. So then I covered the working tweeters with dixie cups (talk about sounding strange, swirly, Like real bad MP3) just to block the sound and see what the rest of the speaker sounded like. VIOLA!!! All the offending sound was gone! So it comes down to the tweeters. These are some very loud tweeters. I can see now how so many of them are blown. I don't mind disconnecting the SDA tweeters. Polk thought we needed them at the time these speakers were made then later took them out. I do need to tone the stereo tweeters down. But I want to do it right. I'm open for suggestions.
I really expected to hear my crossovers had gone bad due to age. Of course that could still be the problem, Or that I need new tweeters. Nobody seems to like the original tweeters.

[shack]

Call Ken Swauger at Polk Customer Service 800-377-7655. Identify yourself as a ClubPolk member (for a discount) and order the RD0194-1 tweeter and replace them all. I think you will notice a substanial difference. The crossover may be bad, but I would try the tweeters first. I don't think there is a replacement crossover, so if it is bad you may have to rebuild it.

[engtaz]

You have the SL1000 tweeters. replacements are the RDO194-1 tweeters. Tell them your a forum member and get a discount. These tweeters are sweet.

[MillerLiteScott]

I bought 4 RDO's and installed 2 of them in my RTA 11t's and they are a noticeable improvement. They only have a few hours on them so far and from what I read they get better after you put some hours on them.

Good luck

[Gary Batson]

OK; I'll call about new tweeters Monday. I hate to waste good tweeters, But I'll do it if I have to.
One thing worth mentioning. I noticed when I had the tweeters covered that their range extends down into the upper midrange. Way lower than ordinary tweeters. The mid drivers range doesn't extend very high at all. That could be why Polk included them in the deminsional array. They do more than just tweet.

Shack; I'm from Tennessee too!!! HI YALL !!!!

[F1nut]

What are you powering them with? How far away from the back and side walls are they? Are they toed in?

[Dennis Gardner]

Check for air leaks that might lessen bass response too. Loose screws are sometimes a culprit.

[Gary Batson]

I was afraid I would be asked that question. In the old days sonny, I powered these speakers with a Hafler amp with about the same power I have now but that amp had a huge transformer in it. It was made to handle difficult loads down to two ohms. What I'm using now is a Yamaha surround receiver with about 115 watts per channel. But these speakers are hard on it. At medium high volumes the internal fan comes on. It never comes on with my other speakers.

They are sort of in an awkward place right now. I just set them up for a listen in front of the cabinets that the equipment and speakers I'm using right now are in.

The bass might really be OK. It's just that the tweeters were blaring so loud that was all I heard. When I had the tweeters covered, Everything else sounded much better.

When I started this thread I thought my problem was more than tweeters. In fact I thought it was the crossover because I had so much upper midrange. Now I'm thinking it might just be the tweeters. I'll replace those and see what happens.

[F1nut]

Sonny? LOL, I'm probably older than you.

Anyway, Yammie's are bright to begin with. I have no doubt that your ears hurt. The RD0194-1's may tame it down a bit, but I'd start looking for a new AVR, if that's what you plan on using for power these days. Of course, proper placement will increase the bass and help balance out the frequencies.

[engtaz]

F1nut is right on the money with

Sonny?
Anyway, Yammie's are bright to begin with. I have no doubt that your ears hurt. The RD0194-1's may tame it down a bit, but I'd start looking for a new AVR, if that's what you plan on using for power these days. Of course, proper placement will increase the bass and help balance out the frequencies.

[dbnh]

Anyway, Yammie's are bright to begin with. I have no doubt that your ears hurt. The RD0194-1's may tame it down a bit, but I'd start looking for a new AVR, if that's what you plan on using for power these days. Of course, proper placement will increase the bass and help balance out the frequencies.

Do the Yahama receivers have sufficient high current to properly power the SDAs? I find my 1Cs need plenty of current to sound their best; Odyssey Extreme monos seem to mate well with the ICs with the rest of my gear, driving the 1Cs effortlessly.

[Loud & Clear]

The replacements aren't drop-ins either. The replacement faceplate is larger than the SL1000 faceplate.

[Gary Batson]

I'm keeping the surround sound for movies so I'll just plug another amp into the pre-outs for the main front speakers. I still have the Hafler amp I used with these speakers in the eighties. If it doesn't blow up when I plug it in I'll use it. It was a good sounding amp. What I want to know is, If these speakers are as efficient as the manual says. Why are they so power hungry?

[Gary Batson]

I ordered new tweeters today. They're not dropins? What do I have to do???

[F1nut]

The RD0's are drop in's for all except the Peerless.

[Gary Batson]

Good!!

[Gary Batson]

I got the new tweeters in the mail today:D . I was not impressed with the cheep looking plastic faceplates . And black silk ? Must come from black worms. Looks like black plastic to me . Put me in a Pessimistic mood:( . I took the original tweeters with the heavy steel faceplates out and proseeded to install the new plastic tweeters. My mood got worse when I saw the screwholes didn't line up. Even worse is that they almost lined up meaning the new screwholes will be on the edge of the old screwholes possibly makeing the old and new holes useless . You would think that if Polk wanted to keep their vintage speakers alive, they would make a replacement tweeter that actually fit the speaker it was made for. I found that if I turned the tweeters cockeyed that two opposite corners on each tweeter would line up with the old screwholes. Not the way I wanted them installed. But a good temporary install just to see how they sounded. I put on Huey lewis - Small World and listened. Hum..sounds pretty much the same , But can't tell really? So I finnished the album. I think they might sound better? I'm getting happier. Then I put on Elton John - Yellow Brick Road. I notice my ears aren't hurting. That pointed end of a pencil stuck in my ear feeling that I got with the other tweeters. I'm actually enjoying the music:) . So I guess I did the right thing:D .

Now...How to install these things right? I guess I'll have to drill new holes. :(

[Lasareath]

Gary,

Hearingimpared has a trick, he takes toothpicks and inserts them into the existing holes with glue or epoxy, let it dry 24 hours, cut the tootpicks flush and screw in your screws at their new locations.

I hear you about the cheap plastic, be very careful screwing them in, I installed 8 of them and by the time I got to the 6th one I heard a little crack, I went a little too hard with the screw and cracked the faceplate.

I'm ordering another one.

I like the black plastic domes, I think it looks really good & they do sound really nice!

Also, they will break in and sound better after around 50 hours ;)

Sal

[Gary Batson]

Thanks everybody for all your input. I really appreciate it. Any further comments are welcome, welcome, welcome.:)

[F1nut]

They are rubberized silk domes, not plastic and as Sal commented, don't even listen to them until you put 50 hours on them.

[Gary Batson]

Gary,

Hearingimpared has a trick, he takes toothpicks and inserts them into the existing holes with glue or epoxy, let it dry 24 hours, cut the tootpicks flush and screw in your screws at their new locations.

I hear you about the cheap plastic, be very careful screwing them in, I installed 8 of them and by the time I got to the 6th one I heard a little crack, I went a little too hard with the screw and cracked the faceplate.

I'm ordering another one.

I like the black plastic domes, I think it looks really good & they do sound really nice!

Also, they will break in and sound better after around 50 hours ;)

Sal

YEA... I think the black looks good too. Matches the other speakers. The toothpick thing sounds like a good idea.

[ben62670]

Now get rid of the Yammi! I did. To really do justice to SDA's you need a separate amp. The early ones are 4 ohms. Some receivers claim to be 4 ohm capable, but most just limit currant. Currant is what SDA's need most. Do some searching on Recommended amps, and receivers for SDA's.
Enjoy
The tweets get better, and better with time!
Ben

[engtaz]

I 2nd Ben's comments.

[dorokusai]

I squeeze wood putty into the holes of vintage Polk speakers prior to re-installing drivers. The toothpick fix works quite well for torn up holes.

[Lasareath]

I 3rd Ben's comments with one change. It's "Current" not "Currant". Currant is fruit. Current = Power!!!!

I just got TWO Carver TFM-35X's on ebay and both with shipping cost me around $750.00, not bad at all.

I don't think that you need two, I'm pretty sure 1 will suffice.

You can find a bunch here: http://electronics.search.ebay.com/c...0QQsacatZ14969

Las

[Gary Batson]

LASARETH; So you're the one bought the amp. I was watching it too. Wasn't going to buy it. Just watching. I've seen your tl drivers on ebay too. Would consider them in case I find my dream speakers and need backups. But I don't do PayPal.

I need to try the Hafler amp I used with these speakers (SDA 1's) eons ago. It's been stored in it's original box in the attic (ouch ) since '91. It might blow up. It might need to be rebuilt. Or it might sound good as ever. I want to use it. I bought it as a kit with what was a lot of money to me at the time. My soul's in it.

[Lasareath]

G'luck with the Hafler, I've allways liked Hafler's. When I was like 17 through 20 my best friend worked at a stereo store, when the boss left we'd pump the Polk's with lots of diffrent amps and I allways liked the Hafler's.

I hope it doesn't blow up!

Try it on some old speakers first, just in case ;)