I'm scared to hook my McIntosh MC2100 to SDA SRS 2 Common Ground Help??

John312
John312 Posts: 33
in Vintage Speakers
Hi, I just got a great deal on some very nice SDA SRS 2's and I can't wait to try them out. But I'm scared to hook them up, I have no idea if my amp is Common Ground, or how to even check. Does anyone know if I am safe to Rock these baby's with my Vintage McIntosh MC2100? Thank you! John
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  • verb
    verb Posts: 10,176
    John312 wrote: »
    Hi, I just got a great deal on some very nice SDA SRS 2's and I can't wait to try them out. But I'm scared to hook them up, I have no idea if my amp is Common Ground, or how to even check. Does anyone know if I am safe to Rock these baby's with my Vintage McIntosh MC2100? Thank you! John

    Hi John - I have an MC300, which is common ground, no issues. Do you have the interconnect cable? Until you're sure, you can run em without the cable. If no one here can say for sure, reach out to McIntosh technical service, as they are very responsive.

    In the meantime, rock on! :smile:
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, Northstar Designs Intenso DAC, Antique Sound Labs AV8 Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Rotel RCD-1072 CD player, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
    Garage #1: Cambridge Audio 640A Integrated Amp, Project Box-E BT Streamer, Polk Tsi200 Bookies, Douglas Speaker Cables, Shunyata Power Conditioner
    Garage #2: Cambridge Audio EVO150 Integrated Amplifier, Polk L200's, Analysis Plus Silver Oval 2 Speaker Cables, IC's TBD.
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  • lawdogg
    lawdogg Posts: 455
    edited December 2019
    According to the circuit diagram, the MC2100 is common ground (chassis ground, in fact).
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • sbb2112
    sbb2112 Posts: 134
    Unless you get into the quad balanced amps they make, the stereo amps are fine.
    Main System
    Marantz AV8802A PrePro
    Marantz MM7025 Amp rear surrounds
    McIntosh MC7205 Amp center, ceiling and mid surrounds
    McIntosh MC300 Amp front mains
    Oppo 203 Bluray
    Polk SDA-SRS with VR3 monastery crossovers
    Polk FX1000 Mid surrounds
    Klipsch RP-440C Center channel
    Klipsch RP-15M Rear surrounds
    SVS prime elevation ceiling surrounds
    Rythmik F15HP sub
    Samsung 8500 curved screen 65" LED 4K
    Mac Mini Server

    Office System
    Musical Fidelity M6s dac/preamp
    Oppo 103D Bluray
    Polk SDA-SRS 2
    Parasound HCA-1500A
    Polk PSW 650 sub
    Microrendu
    Roku Ultra
    Mac Mini Server
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  • John312
    John312 Posts: 33
    Thanks everyone! Can't wait to hear these puppy's. Would anyone care to let me know why its best to keep them close to the wall? I have been told that 8" ideal?
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  • delkal
    delkal Posts: 764
    For a reality check get your Multimeter out and check the resistance between the L and R speaker grounds with everything off. It should be very close to zero. On my multimeter it reads 0.6 ohms (the same value you get when you short the DMM leads together). That means they are connected together internally the amp.
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  • verb
    verb Posts: 10,176
    John312 wrote: »
    Thanks everyone! Can't wait to hear these puppy's. Would anyone care to let me know why its best to keep them close to the wall? I have been told that 8" ideal?

    From the Polk user manual. I have my SRS's about 6" from the back wall. Hope this helps.
    9psh8v5tvvdw.png
    https://polksda.com/
    Basement: Polk SDA SRS 1.2tl's, Cary SLP-05 Pre with ultimate upgrade,McIntosh MCD301 CD/SACD player, Northstar Designs Excelsio DAC, Cambridge 851N streamer, McIntosh MC300 Amp, Silnote Morpheus Ref2, Series2 Digital Cables, Silnote Morpheus Ref2 Series2 XLR's, Furman 15PFi Power Conditioner, Pangea Power Cables, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, Northstar Designs Intenso DAC, Antique Sound Labs AV8 Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: Dayens Ampino Integrated Amp, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's, Shunyata Hydra 8 Power Conditioner
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Rotel RCD-1072 CD player, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
    Garage #1: Cambridge Audio 640A Integrated Amp, Project Box-E BT Streamer, Polk Tsi200 Bookies, Douglas Speaker Cables, Shunyata Power Conditioner
    Garage #2: Cambridge Audio EVO150 Integrated Amplifier, Polk L200's, Analysis Plus Silver Oval 2 Speaker Cables, IC's TBD.
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