SDA CRS Owner Needs Advice

I have a set of 1985 Polk SDA CRS speakers. My dad bought these and a R8 Yamaha Receiver back in the day from a local Hi-Fi shop. They are clean and look to be un damaged. I have the OEM stands and cross-over cable. They just don't sound too good. I have been using them as the front left and right speakers on my surround set-up. I want to get them back into shape for 2ch music listening. I do have very good soldering and mechanical skills. What is the best route to restore these things? I read about new cross-overs, circuit boards, replacing caps and resistors. I don't want to spend a ton of money on them. From what I have read once they are restored they are a decent speaker. Any advice from the experts on what parts I should buy and replace. I mainly listen to classic rock music.


I have a RXA2000 Yamaha home theater amp or the old 85 watt R-8 receiver. I was thinking of using the B speaker setting on the RX A2000 with the Polks CRS for music and get another set of speakers for surround. Will these amps be enough to drive them?

Comments

  • anonymouseanonymouse Posts: 2,636
    Search for CRS rebuild and you will find all the info you need. Feel free to ask specific questions after you have reviewed the tons of advice in older threads. I modded my CRS+ years ago and they sound amazing.
  • codycatalistcodycatalist Posts: 2,661
    Curious on what you feel the speakers are lacking sound quality wise. Even when my SDA 2Bs were stock and hooked up to an older Yamaha AV-34 they sounded pretty good.
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
  • FestYboyFestYboy Posts: 3,852
    Placement is absolutely critical with these and all SDA speakers, but especially the CRS due to the PR orientation. Ideally, you should run a quality, high amp output, 2 channel amplifier for the Polks. Current is the name of the game with SDA. A NAD PE 2200 is a good, inexpensive example (used). Rotel, adcom, emotiva, etc.
  • TennManTennMan Posts: 1,099
    You probably know this since your father bought them... The first rule for SDAs is don't toe them any like you do other speakers. If you do they will sound bad. If they are the ones with 2 tweeters disconnecting the outside tweeters will probably help them sound better.
    SDA 2BTL · Sonicaps · Mills resistors · RDO-198s · New gaskets · H-nuts · Erse inductors · BH5 · Dynamat · Crossover upgrades by westmassguy
    Marantz 1504 AVR (front speaker pre-outs to Adcom 555)
    Adcom GFA-555 amp · Upgrades & speaker protection added by OldmanSRS
    Pioneer DV-610AV DVD/CD player
    SDA CRS+ · Hidden away in the closet
  • boston1450boston1450 Posts: 6,635
    Great info above.. Keep in mind there ARE different CRS speakers. Crs+ & Crs ? Do you have 1 -or- 2 tweeter per cabinet? Which (cross-over cable) do you have? Blade Blade IC cord -or- Pin Blade IC cord? Especially being 1985. Make sure YOU know which ones you have if your doing crossovers upgrades. They may differ if your reading about upgrades. Welcome to forum
    ...
    ...
    Randy / Maine .... SDA-CRS+TL & RTA15TL
  • Dr_WuDr_Wu Posts: 184
    I was almost where you are just a year ago. Although I never thought my 1984 CRS speakers sounded bad, with the original Yamaha R-9 receiver, they never sounded like they did in the hi fi showroom where I bought them. I'm ashamed to say that back then I didn't even know enough to ask what kind of amplification they were using -- it was all the same, right? Doh!

    Download the latest SDA Handbook from this site. Test your speakers in their current form to make sure they measure up. Maybe something has gone bad over the years. Pay strict attention to placement and spacing. Then, replace your receiver with a good integrated amp or amp/preamp separates. I love the Rotel pre/amp combo I have (RTC-940AX and RB-990BX) and I picked them up for $350 total.

    If you still don't like the sound, consider some or all of the updates/upgrades listed in the Handbook. You don't have to spend a fortune on the best caps and resistors. Dayton 1% and Jantzen Crosscaps will cost you a little over $100 for both crossovers. Do the Dynamat, Sonic Barrier, and hurricane nuts.

    Consider a subwoofer, if you think the CRS are lacking in bass (first try putting them a couple inches from the back wall -- it makes a difference).

    Finally, be sure to use good interconnect cables and speaker wire. You don't need to spend hundreds of dollars at this point. You might also consider making some sound treatments for your listening room, as may be needed.

    Take your time. Listen to your system all along the way and assess how each step improves your sound. Then plan the next project and move on. You'll be happy and proud of what you've learned and accomplished when you've finished. From these humble beginnings, the sky's the limit if you want to go farther.

    Enjoy the ride!
  • boston1450boston1450 Posts: 6,635
    Mojo212 wrote: »
    I have a set of 1985 Polk SDA CRS speakers. My dad bought these and a R8 Yamaha Receiver back in the day from a local Hi-Fi shop. They are clean and look to be un damaged. I have the OEM stands and cross-over cable. They just don't sound too good. I have been using them as the front left and right speakers on my surround set-up. I want to get them back into shape for 2ch music listening. I do have very good soldering and mechanical skills. What is the best route to restore these things? I read about new cross-overs, circuit boards, replacing caps and resistors. I don't want to spend a ton of money on them. From what I have read once they are restored they are a decent speaker. Any advice from the experts on what parts I should buy and replace. I mainly listen to classic rock music.


    I have a RXA2000 Yamaha home theater amp or the old 85 watt R-8 receiver. I was thinking of using the B speaker setting on the RX A2000 with the Polks CRS for music and get another set of speakers for surround. Will these amps be enough to drive them?

    If they have the SL2000 tweeter that screatch at ya-that can be irritating to the ears. Polk has "drop in" replacements (if in stock)
    ...
    ...
    Randy / Maine .... SDA-CRS+TL & RTA15TL
  • Dr_WuDr_Wu Posts: 184
    Yeah, totally forgot to mention the tweeters. Probably RD-0194s from Polk. They don't exactly drop in, as they're a tad larger than the cut-outs in the original baffles. You can do woodwork to make the replacements fit, or do it the simple way I did. Trim off the outer flange of the new tweeter (I used a Dremel cutting wheel or three). Then the tweeter mounts flush in the original space. You may need to replace the gaskets on some or all of the drivers. Armacell foam insulation tape is the way to go.
  • Update. I hooked my CRS + Polks to an old Yamaha R-8 amp. I set them 3" from wall and they sound fantastic! it seems my RX-A2000 is injured and that was the problem. Thanks
  • boston1450boston1450 Posts: 6,635
    edited December 2019
    Dr_Wu wrote: »
    Yeah, totally forgot to mention the tweeters. Probably RD-0194s from Polk. They don't exactly drop in, as they're a tad larger than the cut-outs in the original baffles. You can do woodwork to make the replacements fit, or do it the simple way I did. Trim off the outer flange of the new tweeter (I used a Dremel cutting wheel or three). Then the tweeter mounts flush in the original space. You may need to replace the gaskets on some or all of the drivers. Armacell foam insulation tape is the way to go.
    I have heard of this & the process U describe.. Strange .. When I got my CRS+ speakers years back I replaced the stock sl2000 with the 0194 tweeters & a year later had Dave do the TL upgrade & i slid the 0198 tweeters in the cabinets. Never having to touch a thing. All holes lined up & all the original gaskets were still intact. They seat'd just perfect. Pretty easy project.. Thanks to Dave he designed baffles & walked me right thru the process & I have been enjoying them since.
    ...
    ...
    Randy / Maine .... SDA-CRS+TL & RTA15TL
  • vcwatkinsvcwatkins Posts: 1,975
    You may want to check out @DarqueKnight's TL upgrade thread and consider doing this mod if/when you update the crossovers. I followed this and @nspindel's threads and love the results. IIRC it was $200ish for Sonicap/Solen/Mills and RDO198.

    https://forum.polkaudio.com/discussion/46489/4-1tl-modification-for-1989-version-sda-crs/p1
    Den: Roon (Sonic Transporter) * PS Audio DirectStream Jr. * Adcom GFP-750 * Sunfire Signature II * PSAudio PP3 * MIT S3 * Polk SRS 1.2
    Study: Roon * ProJect Stream Box Ultra & Pre Box S2 * Pass ACA * PSA Dectet * DH Labs Q10 * Brines Folded ML-TQWT RS 40-1354
    Studio: Roon * LG v30 phone * Dared MP-5 * DefTech SM45
    Beach: Rega RP6 * AT33PTGII * Budgie SUT * Jolida jd9 * Roon * Sonore UltraRendu (LPS-1, WW Plat7, Iso Regen, Lush) * Schiit Yggdrasil * Joule-Electra LA-100 mkIII * Pass Aleph 30 / First Watt F5 Clone * PSA Dectet * MIT S3 * Polk SRS 2.3tl
    Beach Den: Sonore microRendu * Dayens Menuetto * Fostex BK-12m Folded Horn / KEF LS50 / Dynaudio Audience 50 / Revel M22

  • CH46ECH46E Posts: 1,974
    I did not read the whole thread but with my CRS they did not bloom until I moved them about 18 inches off the back wall and removed the SDS SRS 2 from behind them.
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!