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  1. #1

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    Default New SDA-SRS Owner / Bi-Amplification Q

    Well, having spent the last six (or so) hours reading everything that had anything to do with 'SDA-SRS' speakers, and having won a pair of such a few hours ago on eBay, I almost feel like I know some of you!

    I do have a question for those who likely experiented with bi-amp'ing the SRS's. Am I correct in my summation that there is some disdain for this configuration as compared to a more powerful single amp setup? Specifically, I was thinking of using my two DH-500's setup as one for HF and the other for LF. Further, since I read (and have no reason to disbelieve) the nominal impedance is 4 ohms on the SRS's...is this true for both the HF and LF parts when seperated? My Haflers are nicely modified so I should just about be at exactly 1000W per speaker at 4 Ohms...sounds like some earth-shaking fun to me! I've already got a friend with a truck lined up to go pick up the new SRS's...what a nice addition to my CRS's there going to make!!! (hopefully it'll be tomorrow! :D )
    Chris Underwood (Bitwise)
    Outlaw 970
    2X Hafler DH-500 (w/mods)
    Sony DVP-NS751P DVD/CD
    Scientific Atlanta 8300HD CATV/HDR
    Westinghouse LVM-42W2 1080P LCD HDTV
    WMC PC (DVI 1080P, +2TB NAS)
    Polk SDA-SRS (Fronts...Soon!...won on ebay 5/15/05)
    2X Polk SDA-CRS (Sides/Rears)
    Mackie HR824 (Center)
    Velodyne DD 15 (Sub)

  2. #2

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    Chris welcome to the forum and congrats on your SRS find.

    I have the owners manual that gives the specs and instructions on bi-amping but it is at home and will be later this afternoon before I can help you.

    Sorry
    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

  3. #3

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    Bi-amping is nice....just don't forget to remove the jumper wire. I forgot to do so and instantly fried one amplifier and was plain lucky that I didn't damage the other amp nor my SRS's.
    Amplifiers: 1-SAE Mark IV, 4-SAE 2400, 1-SAE 2500, 2-SAE 2600, 1-Buttkicker BKA 1000N w/2-tactile transducers. Sources: Sony BDP CX7000es, Sony CX300/CX400/CX450/CX455, SAE 8000 tuner, Akai 4000D R2R, Technics 1100A TT, Epson 8500UB with Carada 100". Speakers:Polk SDA SRS, 3.1TL, FXi5, FXi3, 2-SVS 20-29, Yamaha, SVS center sub. Power:2-Monster HTS3500, Furman M-8D & RR16 Plus. 2-SAE 4000 X-overs, SAE 5000a noise reduction, MSB Link DAC III, MSB Powerbase, Behringer 2496, Monarchy DIP 24/96.

  4. #4

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    All the manual gives is "5 ohms D.C. Resistance" but it does say that "it's ok to use a non-common ground amp on the high side and a smaller amp can be used there as long as it has excellent headroom".
    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

  5. #5

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    HI,

    I'm new to the Polk Club and have just picked up a pair of 1.2tl's. When I connect the interspeaker connector wire it shuts off my Denon receiver (110 rms) when I turn it up. Anyone got any ideas?
    Thanks,
    Jack

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    Quote Originally Posted by Jack Dawson
    HI,

    I'm new to the Polk Club and have just picked up a pair of 1.2tl's. When I connect the interspeaker connector wire it shuts off my Denon receiver (110 rms) when I turn it up. Anyone got any ideas?
    Thanks,
    Jack
    More power and more power, it is not the innerconnect you need more power. What happens when you listen at 0900.
    JT

  7. #7

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    Jack,

    Are you sure that your receiver is a common ground design? (i.e., the ground connection of both channels are tied together). Most receivers are common ground, but there is the occasional odd animal out there.

    If your receiver is not a common ground design, it will see a dead short when the interconnect is attached.

  8. #8

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    Quote Originally Posted by Jack Dawson
    HI,

    I'm new to the Polk Club and have just picked up a pair of 1.2tl's. When I connect the interspeaker connector wire it shuts off my Denon receiver (110 rms) when I turn it up. Anyone got any ideas?
    Thanks,
    Jack

    you will want to buy a seperate amp for your 1.2TL's your Denon will continue to shut down every time. there is no way it has the guts to power 4ohm SDA's.

    Look for a stereo amp that can handle 4ohm loads.
    PolkFest 2012, who's going>?
    Vancouver, Canada Sept 30th, 2012 - Madonna concert

  9. #9

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    Quote Originally Posted by Bitwise
    I do have a question for those who likely experiented with bi-amp'ing the SRS's. Am I correct in my summation that there is some disdain for this configuration as compared to a more powerful single amp setup?
    No disdain, it's just that different people have obtained different results.

    I found that the amount of improvement, if any, depended on the amps used. Experiment to find what sounds best to you.

  10. #10

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    Quote Originally Posted by danger boy
    you will want to buy a seperate amp for your 1.2TL's your Denon will continue to shut down every time. there is no way it has the guts to power 4ohm SDA's.

    Look for a stereo amp that can handle 4ohm loads.
    1.2TL's are 8 ohms, or at least the literature says they are "compatible with 8 ohms".

    The original SRS's are 4 ohms.


    Jack,

    You might also check to make sure that something is not mis-wired inside your speakers.

  11. #11

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    I second the wiring check before you run off half-cocked to buy an new amplifier. Basic troubleshooting went the way of the Dodo around here.

    Contact polkcs@polkaudio.com or 800.377.7655 for an SDA SRS 1.2TL wiring schematic.

  12. #12

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    [QUOTE=dorokusai]I second the wiring check before you run off half-cocked to buy an new amplifier. Basic troubleshooting went the way of the Dodo around here.QUOTE]


    wwwaaaaaaaaaaaaaaaaaaaaaaa

    it`s always good to look at it before ya throw money at it...;)

  13. #13

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    that's no fun.. it's tons of fun spending someone else's money. ha ha ha

  14. #14

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    Quote Originally Posted by Bitwise
    Well, having spent the last six (or so) hours reading everything that had anything to do with 'SDA-SRS' speakers, and having won a pair of such a few hours ago on eBay, I almost feel like I know some of you!

    I do have a question for those who likely experiented with bi-amp'ing the SRS's. Am I correct in my summation that there is some disdain for this configuration as compared to a more powerful single amp setup? Specifically, I was thinking of using my two DH-500's setup as one for HF and the other for LF. Further, since I read (and have no reason to disbelieve) the nominal impedance is 4 ohms on the SRS's...is this true for both the HF and LF parts when seperated? My Haflers are nicely modified so I should just about be at exactly 1000W per speaker at 4 Ohms...sounds like some earth-shaking fun to me! I've already got a friend with a truck lined up to go pick up the new SRS's...what a nice addition to my CRS's there going to make!!! (hopefully it'll be tomorrow! :D )
    Firstly WHICH SRS's do you have?Secondly do you know about the common grounding issue with Polk SDA's?Using multiple amplifiers means that you have no common ground between the channels.Read the owners manual (if you get one)and the back of the speakers when you get them.I may have sent the seller of those speakers an e-mail reminding them to alert the winner about the common grounding issue.
    Carlton-Aquario67 on ebay
    Experience counts a thousand times,where words only count ONCE.:o

  15. #15

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    Quote Originally Posted by Jack Dawson
    HI,

    I'm new to the Polk Club and have just picked up a pair of 1.2tl's. When I connect the interspeaker connector wire it shuts off my Denon receiver (110 rms) when I turn it up. Anyone got any ideas?
    Thanks,
    Jack
    Jack
    Look for the thread on this site that asks a question about the power needs os SDA-2's and you will see some very important information there.
    Experience counts a thousand times,where words only count ONCE.:o

  16. #16

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    I had my SRS's biamped for many years with two Adcom 555's until I purchased my 565 monos that I still use today. They work best with two identical amps. I had also tried a 555 on the low end and a 545 on the high end, but found that the tweeters still needed the higher output of the 555 to have a balanced sound.

  17. #17

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    Welcome...I LOVE VEGAS.

    Transport: Oppo BDP-103/USB HDD (flac)
    DAC/Preamp: Benchmark DAC/PRE
    Power Amp: Parasound HCA-1500A
    Speakers: Harbeth Compact 7ES-3 Monitor
    Cables: Kimber Hero/8TC; DH Labs D-75

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