Amps for SDA SRS 1.2tl

davis419b
davis419b Posts: 61
edited July 2010 in Vintage Speakers
I have had a set of SRS,s for a few months now but have not been listening to them for lack of an amp with enough power. I tried to demo a set of Hafler DH-500,s bridged internally to 800wpc. After hooking them up we realized that the Halers are non grounded amps. My question can they be made to work and what will they make the SRS,s sound like. If these are the wrong amps I will keep looking.

Thanks, Don
Post edited by davis419b on
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  • F1nut
    F1nut Posts: 51,997
    edited July 2010
    You can always make an AI-1 isolation transformer, which will allow you to use non-ground amps. That said, bridged amps do not like to see less than an 8 ohm load. Your speakers are 6 ohm nominal and dip lower, so they really are not a good choice. Bridging also has other issues not beneficial to good sound such as an increased noise floor.
    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

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  • jrgoswick
    jrgoswick Posts: 159
    edited July 2010
    F1 nailed that one. Bi-amp them instead. Somewhere herein, someone built a high current variant of the A1(I think it was called the dreadnought or something to that effect-someone else will read this and probably re-link it).
    Onkyo TX-SR705 AVR
    Onkyo M-501-Given to my father.
    Onkyo DX-C730 CD Changer
    Onkyo DV-BD507 Blu Ray player
    Onkyo CP-1036A turntable with Grado, Audio Technique, and Azden cartridges(GOT CARTRIDGE??)
    Polk Monitor 12's with RDO's and XO's
    Polk CS300 Center
    Polk Monitor Series 4 rears

    EBAY is like cocaine. At first you only look, next thing you know, your house is full of crap you have no idea why you own.:eek:
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  • george daniel
    george daniel Posts: 12,096
    edited July 2010
    here you go

    http://www.polkaudio.com/forums/showthread.php?t=74472&highlight=dreadnaught
    JC approves....he told me so. (F-1 nut)
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  • davis419b
    davis419b Posts: 61
    edited July 2010
    Thanks Guys, you have been a great help ! I have decided to pass on these amps. I am going to put the speakers back in the spare bedroom until I find the right amp or decide to sell them first.

    Thanks, Don
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  • domflane
    domflane Posts: 653
    edited July 2010
    Sell them? I'm sure plenty of us would love to take them off your hands . .
    Home Theater
    RTiA5 - CSiA6 - FXiA6 - PSW650 - Pioneer Elite SC-55 - Carver AV-505 - Sony 46" 120Hz - Monster HP 2400 - Xbox 360 - Playstation 3
    2 Channel
    Polk RTA 15TL - Harman Kardon HK3485 - HK DVD48 - Signal Cable IC's and speaker cables
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  • helipilotdoug
    helipilotdoug Posts: 1,230
    edited July 2010
    Because I have Carver and Sunfire amps, my opinion might be biased. I'd recommend either a pair of Carver TFM-45/55/or 75 or look at the Sunfire 600X2 amps. Any of these should give you enough good clean power for your SRS's.
    Sunfire Theater Grand IV
    Sunfire Cinema Grand Signature
    SRS 2.1TL
    SDA 2BTL's
    CSiA6
    FXiA4
    FXiA6
    SDA 2A's
    Monitor 10A's
    http://www.douglasconnection.com
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  • nooshinjohn
    nooshinjohn Posts: 26,000
    edited July 2010
    A Sunfire 300/2 would have plenty of gas to drive the SRS's and not even break a sweat.
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2800 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon MiND2 Shunyata Triton/Typhon Rotel RP9400 Turntable

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson

    How many flies need to be buzzing a dead horse before you guys stop beating it?
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  • thuffman03
    thuffman03 Posts: 1,325
    edited July 2010
    Sunfire would be a great choice IMO.
    Sunfire TGP, Sunfire Cinema Grand, Sunfire 300~2 (2), Sunfire True Sub (2),Carver ALS Platinum, Carver AL III, TFM-55, C-19, C-9, TX-8, SDA-490t, SDA-390t
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  • davis419b
    davis419b Posts: 61
    edited July 2010
    Thanks for the suggestions guys ! Im not going to make any drastic moves just yet. I have 2 sets one Walnut and one Oak and will find the right amp someday.
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  • F1nut
    F1nut Posts: 51,997
    edited July 2010
    A stack of Crown amps and Peavy speakers will move you too.
    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

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  • SDA SRS 1.2
    SDA SRS 1.2 Posts: 255
    edited July 2010
    helipilotdoug wrote: »
    Because I have Carver and Sunfire amps, my opinion might be biased. I'd recommend either a pair of Carver TFM-45/55/or 75 or look at the Sunfire 600X2 amps. Any of these should give you enough good clean power for your SRS's.

    Good recommendation!
    Main System: Polk SDA SRS 1.2 Speakers, Sunfire Signature 600~two Amp, Carver C-16 Preamp, Carver TX-11b Tuner, Marantz 6350Q TT, Philips CDR-775 Recorder, Teac V-707RX Cassette Deck, Signal Cable Double Run Speaker Cable

    Upstairs Den: Marantz 2325 Receiver, Marantz 5220 Cassette Deck, Marantz HD-880 Speakers, Marantz 6370Q TT

    Exercise (Kabuki speaker) Room: Kenwood KR-9600 Receiver, Pioneer CS-99a Speakers, Sansui SP-X9000 Speakers (not pretty, but LOUD! :) )
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  • SDA SRS 1.2
    SDA SRS 1.2 Posts: 255
    edited July 2010
    Have had both Carver and Sunfire and both are excellent matches for the SDA's.
    Main System: Polk SDA SRS 1.2 Speakers, Sunfire Signature 600~two Amp, Carver C-16 Preamp, Carver TX-11b Tuner, Marantz 6350Q TT, Philips CDR-775 Recorder, Teac V-707RX Cassette Deck, Signal Cable Double Run Speaker Cable

    Upstairs Den: Marantz 2325 Receiver, Marantz 5220 Cassette Deck, Marantz HD-880 Speakers, Marantz 6370Q TT

    Exercise (Kabuki speaker) Room: Kenwood KR-9600 Receiver, Pioneer CS-99a Speakers, Sansui SP-X9000 Speakers (not pretty, but LOUD! :) )
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  • read-alot
    read-alot Posts: 812
    edited July 2010
    Parasound JC1 x 2 does a decent job :)
    polkaudio SRS (rdo194 x 8)
    Dodd ELP (separate power supply)
    JC 1 blocks ( strapped )
    Rega Apollo
    MIT (speaker cables) Outlaw (ICs)

    polkaudio SDA2(rdo194x4) (front) polkaudio CRS (rdo194x4)(rear) polkaudio 400i (center)
    B&K 505
    Samsung LCD
    VIP 622
    HSU STF-2
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  • nacam
    nacam Posts: 56
    edited July 2010
    I am running mine with a Rotel RB-1090 (380wx2). It's more than enough power to encourage me to monitor the cracks in the foundation of my basement. The damping factor on the amp is >1000 so it controls the drivers quite nicely.
    2 Channel Basement Setup:
    PC With M-Audio Audiophile 24/96 Card
    Rotel RC-1070
    Rotel RB-1090
    Polk Audio SDA SRS 1.2TL (1991) w/RD0-198 Tweeters.
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  • F1nut
    F1nut Posts: 51,997
    edited July 2010
    The damping factor on the amp is >1000 so it controls the drivers quite nicely.

    That's not true. I use to think that the higher the damping factor, the better the amp could control the drivers, but discovered that it is far from the truth. The difference between a damping factor of 50 and 1000 is so small that it is a complete non-factor.

    In fact, I had a Rotel amp in a rig at one time with a 1000 damping factor that could not control the woofers properly. I replaced it with a tube amp, damping factor of 50 that has never had a problem controlling the woofers.

    There is more to it than the damping factor.
    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

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