Guidance needed - SDA SRS (4th Gen) and modern amplifier?

2»

Comments

  • Gunther16
    Gunther16 Posts: 243
    I inadvertently hoarded! My bad o:)
    · Share on FacebookShare on Twitter
  • aleya
    aleya Posts: 11
    So... The top tweeter on the left channel appears to be dead. Thoughts on troubleshooting / likelihood of it being the tweeter versus something internal?

    Also, I ended up picking up a new Rotel RB1582 mkII and am super happy with it so far. Haven't had a chance to really crank things up yet (young kids at home), but everything sounds great at moderate volume and I'm pleased with the integration into my HT setup.
    · Share on FacebookShare on Twitter
  • Dennis Gardner
    Dennis Gardner Posts: 4,861
    Just so you know, the top tweeter is the last in the array to kick in and should only do so at the highest volume levels from my understanding of the crossover. They fire in a 3-4-2-1 order. The top as #1.
    HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable

    2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
    · Share on FacebookShare on Twitter
  • westmassguy
    westmassguy Posts: 6,850
    The top tweeter is fed through a band-pass filter. It's frequency response in very limited relative to the other tweeters. It's possible the 5.8uf Electrolytic Cap dried out and failed, but it's also possible the tweeter itself burned out. Best way to check, without removing the tweeter, is with a paper towel or toilet paper tube placed over the dome.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
    · Share on FacebookShare on Twitter
  • honestaquarian
    honestaquarian Posts: 3,186
    aleya wrote: »
    Alright everybody, back on topic! :)
    I've come across two local amp options that I'm interested in feedback on. Both are Adcoms. One is a GFA-5500 (asking price is $395) and one is a GFA-5800 (asking price is $589).

    I've done some diligence, and my understanding is that these are not common ground amps but can be used with the SDAs by strapping the negative terminals on the amp (or by utilizing the AI-1 interconnect).

    Assuming that is correct (and please put me straight if it isn't!), is the 5800 worth the extra couple hundred dollars? Any reason to stay clear of either option?

    Finally, I noticed that one of the mid-woofers has a very small tear in the surround, and that the cone is slightly bent. It could have happened during transit or I might not have noticed it during the audition. Any thoughts on where to get an OEM replacement? Googling turns up MidWest Speaker Repair (though it looks like they are out of stock until June, which isn't a problem), but just curious whether these can still be obtained directly from Polk or if there's another preferred source.

    Thanks again everyone.

    Quick answer is YES about the 5500 versus the 5800
    However if you could get your mits on a GFA-5802 that would be a MUCH better choice!
    · Share on FacebookShare on Twitter
  • aleya
    aleya Posts: 11
    westmassguy wrote: »
    The top tweeter is fed through a band-pass filter. It's frequency response in very limited relative to the other tweeters. It's possible the 5.8uf Electrolytic Cap dried out and failed, but it's also possible the tweeter itself burned out. Best way to check, without removing the tweeter, is with a paper towel or toilet paper tube placed over the dome.

    Definitely not working. Sound comes through the right channel top tweeter, but left is totally dead. Advice on troubleshooting the tweeter versus the cap? If it's the cap, how hard is it to find replacements?
    · Share on FacebookShare on Twitter
  • F1nut
    F1nut Posts: 50,550
    Just move the tweeter to one of the other locations. Still not working, you need a tweeter.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

    · Share on FacebookShare on Twitter