Anyone run Adcom on sda's

boston1450
boston1450 Posts: 7,639
edited August 2013 in Vintage Speakers
Was wondering if anyone runs adcom on sda's. is Adcom common ground? Any feedback is appreciated TIA
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  • Polkie2009
    Polkie2009 Posts: 3,834
    edited July 2013
    Adcom power amps 545, 555 and their newer ii should be common ground, always check to be sure. I believe the 565 is a mono design and is NOT COMMON GROUND. Others have them here and can chime in. I can't remember if you can strap the grounds together between the 2 mono amps and run them, once again, maybe a 565 owner can chime in. There are tons of threads here dealing with this very issue. Also search for Polk AI-1 or dreadnaught to replace using the interconnect cable on SDA's etc... There are a number of variables involved ,such as model of SDA's type of IC connection ,pin/blade or blade/blade and serial numbers of the set of SDA's . Once again, lots to research ,but the last thing you want is to ruin your amps and speakers by running them the wrong way.
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  • boston1450
    boston1450 Posts: 7,639
    edited July 2013
    Thank you for info. Was just looking on the bay & getting idea's on different models & prices
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  • Malbec
    Malbec Posts: 553
    edited July 2013
    I'm running a 5500 with the ground terminals strapped. It is not common ground.
    The 565 monoblocks can be strapped too.
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  • cnh
    cnh Posts: 13,284
    edited July 2013
    Looks like you're covered.

    Adcoms are pretty neutral in their presentation. I have a couple up here (545, 555). What's important with an Adcom is that you get a good pre-amp. Some of Adcom's own pre-amps are a little grainy and bright up top, only the GFP-750 is a great match for them. Not quite on a par with the 750 but still decent, is the GFA-715.

    Other than these two, I'd look elsewhere for a pre-amp to drive my SDAs. Actually, going with a "tube" pre-amp might be a nice combo?

    In any case. Adcoms are built like tanks, it's hard to KILL one (and I don't mean the latter multi-channel amps that have had some problems on this site. I mean the old two channel units) and they're a great value for the "money". You have to spend a lot more to move to the next level.

    Have fun.

    cnh
    Currently orbiting Bowie's Blackstar.!

    Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
    [sig. changed on a monthly basis as I rotate in and out of my stash]
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  • teekay0007
    teekay0007 Posts: 2,289
    edited July 2013
    Boston Randy, the GFA-555II does a superb job of driving the SDA-2Bs. I tried the GFA-545II for a while, but was just not wowed by it. The 555II also does a much better job than the Carver TFM-24/TFM-25 with the 2Bs, IMHO.

    Which models are you looking at?
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  • gudnoyez
    gudnoyez Posts: 8,124
    edited July 2013
    Thanks to Terry good ol (Tekay007) including me in a deal on an Adcom 555II my 2B's are properly powered. I have a 545II powering a pair of CRS+'s. Good luck Randy on getting the Amp you are looking at.
    Home Theater
    Parasound Halo A 31 OnkyoTX-NR838 Sony XBR55X850B 55" 4K RtiA9 Fronts CsiA6 Center RtiA3 Rears FxiA6 Side Surrounds Dual Psw 111's Oppo 105D Signal Ultra Speaker Cables & IC's Signal Magic Power Cable Technics SL Q300 Panamax MR4300 Audioquest Chocolate HDMI Cables Audioquest Forest USB Cable

    2 Channel
    Adcom 555II Vincent SA-T1 Marantz SA 15S2 Denon DR-M11 Clearaudio Bluemotion SDA 2.3tl's (Z) edition MIT Terminator II Speaker Cables & IC's Adcom 545II Adcom Gtp-450 Marantz CD5004 Technics M245X SDA 2B's, SDA CRS+

    Stuff for the Head
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  • bored184
    bored184 Posts: 324
    edited July 2013
    I've got a Adcom GFA-555 matched with an Adcom GFP-710 preamp running a set of SRS 2s. So far I am really liking the combo. I would love to try a GFP-715 or 750 but those are a little out of my budget at the moment.
    Speakers: TL Monitor 10s, RTA 11TLs, Fortes, Thiel CS 1.2
    Amplifiers: ]Ashly FTX 2001 III, Dynaco ST-70, DIY F6
    Pre: Adcom GFP 750, Aikido Tube Pre
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  • TennMan
    TennMan Posts: 1,266
    edited July 2013
    I have and Adcom GFA-555 and a GFA-545II. Both are common ground. Both sound great with my Adcom GTP-450 preamp and 2Bs. I'm still trying to decide if I like the 545 or the 555 best. The GFA-545 is a little brighter but my old ears seem to like it. The GFA-555 is probably more accurate.
    • 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
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  • deronb1
    deronb1 Posts: 5,021
    edited July 2013
    Ran a 555 with thw 2Bs for awhile. A good match for sure. Tried a Parasound and liked the sound a little better. There are a number of excellent choices out there.
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  • boston1450
    boston1450 Posts: 7,639
    edited July 2013
    There is one listed with a pre for a decent price. If its still here i may jump on it. Im using a Yamaha 2040 now. And it sounds great. But i want to jump up a little into something different & make them sing. Ive always liked Adcom too. Cross my fingers. Thanks for all the info
    ..
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  • Mr. Bubbles
    Mr. Bubbles Posts: 736
    edited July 2013
    As some have already said, many good choices out there for amps. I currently run a GFA-555II on my SDA SRS. have run a pair of 545II's and they sounded good also. Just removed a Carver M4.0T SS from my 1.2TL's and am currently using a pair of Marantz 140's. The carver definitely had more power but I cant say it sounded any better. Of course I switched the pre with the amp as well was running a carver C-1 with the 4.0T and am running a Marantz 3250. Am going to switch out and try the 7T with this soon.

    Anyway the SDA's are great sounding speakers and sound great with many different amps. They do tend to like power, at least when using solid state amps. The Adcom sounds great with them but so does other gear. Listen to as many set ups as possible and decide what type sound you like. Some prefer tubes while others prefer solid state. Some solid state can sound like a cross of the two to some degree. I would say the vintage Marantz gear I have used falls into this category. the Adcoms are more detailed.
    If con is the opposite of pro, is Congress the opposite of Progress?!


    Monitor 5Jr, Monitor 5, RTA12, RTA 15TL, SDA 2A, 1c, SRS 2, 1.2TL, CRS, Atrium.
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  • boston1450
    boston1450 Posts: 7,639
    edited July 2013
    Just talked to guy. He says its a GFA-555 & GFP 565 does that pre model number sound correct. He said he wasnt home at the moment ? Any feedback on that pre ? Thanks
    ..
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  • TNHNDYMAN
    TNHNDYMAN Posts: 2,145
    edited July 2013
    Don't know much about that particular pre, but I will opinionate that almost any of the adcom pre's will sound better with that amp than using a regular mid fi AVR as a pre. Some people may like their upper level Pioneer Elites and high end vintage Marantz's better. I have used an Adcom GTP 450 and felt it did a much better job than my Onkyo 706 AVR. Just try to talk the guy into a good combo price and look for a better pre later if not satisfied with it after trying it for a bit. You can always flip the pre and put that $ towards something else. If you can be lazy like myself, then a remote is always a nice bonus.
    2-ch System: Parasound P/LD 2000 pre, Parasound HCA-1000 amp, Parasound T/DQ Tuner, Phase Technology PC-100 Tower speakers, Technics SL-1600 Turntable, Denon 2910 SACD/CD player, Peachtree DAC iT and X1asynchorus USB converter, HSU VTF-3 subwoofer.

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  • boston1450
    boston1450 Posts: 7,639
    edited July 2013
    Thanks. I look forward to seeing it. I could care less if it has remote. But bonus if it does ? I have only listen to Adcom a few times & they sounded very nice on a bigger sda's than what i have. And if i remember it was a lower wpc Adcom also. They also had a Adcom cd player too if i remember correctly. But they were way over priced on the speakers & the system. So i walked away :( from the place.
    ..
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  • Mr. Bubbles
    Mr. Bubbles Posts: 736
    edited July 2013
    I run the Adcom GFP-565 with my other Adcom gear and so far have been very satisfied. You should like that combo.
    If con is the opposite of pro, is Congress the opposite of Progress?!


    Monitor 5Jr, Monitor 5, RTA12, RTA 15TL, SDA 2A, 1c, SRS 2, 1.2TL, CRS, Atrium.
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  • zingo
    zingo Posts: 11,258
    edited July 2013
    boston1450 wrote: »
    Thanks. I look forward to seeing it. I could care less if it has remote. But bonus if it does ? I have only listen to Adcom a few times & they sounded very nice on a bigger sda's than what i have. And if i remember it was a lower wpc Adcom also. They also had a Adcom cd player too if i remember correctly. But they were way over priced on the speakers & the system. So i walked away :( from the place.

    Adcom or Carver are historically solid for SDAs for less coin.
    Jake
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  • chandler9a
    chandler9a Posts: 878
    edited July 2013
    Boston,

    I have a really nice GFA-555 I can sell you if you are interested or if the other deal falls through. Its a great amp IMO but I just don't need it right now. It ran my SDA 2A's as well as my current SDA 1C's, just a work horse of an amp but still smooth. PM if you are interested.

    Not sure on that particular Pre, Ive heard the GFP-555 and its fine, better than an AVR for sure. Personally, I think the amps are a better deal for the money.
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  • boston1450
    boston1450 Posts: 7,639
    edited July 2013
    chandler9a wrote: »
    Boston,

    I have a really nice GFA-555 I can sell you if you are interested or if the other deal falls through. Its a great amp IMO but I just don't need it right now. It ran my SDA 2A's as well as my current SDA 1C's, just a work horse of an amp but still smooth. PM if you are interested.

    Not sure on that particular Pre, Ive heard the GFP-555 and its fine, better than an AVR for sure. Personally, I think the amps are a better deal for the money.
    pm'd ya.....thank you all for advice. Im going to be looking at them tomorrow. I know there is some cosmetic issues that may effect the outcome. So we will see what happens then. Thanks again
    ..
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  • chandler9a
    chandler9a Posts: 878
    edited July 2013
    no problem, I hope it works out for you, Local is always good. Let me/us know if you need any advice on the unit, like I said, its a great piece to own. I wish I could keep mine just to have, but it makes no sense, especially if someone else could use it.

    Good luck tomorrow.
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  • leftwinger57
    leftwinger57 Posts: 2,917
    edited August 2013
    Most people here by now know I recently grabbed a pair of SDA-2bs.I already had an Adcom gfa 555 rack face model and can push these speakers w/ enough power to spare .I swear that I have never gone past the 12 0'clock pos on my pre for fear of destroying them. If you have a 555 to me you have clean neutral power and again enough to go around.
    2chl- Adcom GFA- 555-Onkyo P-3150v pre/amp- JVC-QL-A200 tt- Denon 1940 ci cdp- Adcom GFS-6 -Modded '87 SDA 2Bs - Dynamat Ext.- BH-5- X-Overs VR-3, RDO-194 tweeters, Larry's Rings, Speakon/Neutrik I/C- Cherry stain tops Advent Maestros,Ohm model E

    H/T- Toshiba au40" flat- Yamaha RX- V665 avr- YSD-11 Dock- I-Pod- Klipsch #400HD Speaker set-

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  • boston1450
    boston1450 Posts: 7,639
    edited August 2013
    Attachment not found.snagged it. I was worried about condition as they said there was a scratch on it. Well its a little one about a half inch or so on right lower front of amp. Easy touch up. I think i should be happy with it. Hope to have it hooked up this weekend. Thanks again everyone. I will update on what i think of it when i do. I think my speakers will be very pleased now :) randy
    ..
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  • chandler9a
    chandler9a Posts: 878
    edited August 2013
    Looks great! You will be pleased with the sound for sure. Watch out though, once you are bit by the upgrade bug, it only gets harder... let us know how it sounds
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