Bi-Amping 2.3TL's with Adcom 555 II

Viking64Viking64 Posts: 4,251
edited October 2010 in Electronics
Hello, I am looking to get more out of my Polk SRS 2.3 TL's. I am currently powering them with an Adcom GFA 555 II power amp (200 watts). They are bi-wired with Monster Z Series Speaker Cables. I want to bi-amplify the 2.3's but I am not sure which method is best. The Adcom is bridgeable, resulting in 600 watts. Would it be better to get another used GFA 555 II (for approxiamately $400) and bridge them both, thus using one per each channel @ 600 watts and maintain my bi-wiring set-up, or should I use one for low pass and one for high at 200 watts each? I have been told by some "experts" that my high pass amp should be half the wattage of the low, but my original user guide from Polk says they should be equal, if not identical amps. I have been told that 200 watts is WAY too much for the high end in ANY speaker by a representative at the Polk dealer where I bought them in 1992. He recommended that I use the Adcom for the low pass and jumper (via 2 "y" cables splitting from the pre/main coupler on my Yamaha DSP A-1) through the internal 110 watt main amp and out to the high pass. Also, would bridging two GFA 555 II's result in any issue regarding "non-common ground" amps that I have read about?
Post edited by Viking64 on
«1

Comments

  • george danielgeorge daniel Posts: 11,992
    edited October 2010
    if you use monos you should comply and use the AI-1 non common ground interface.
    Bridging 555's is painful to one ears-- just my .02

    I think that you would be better off spending the monies or tubed amplification,,ot a better ss amp with more current/power,, such as Parasound,Musical Fidelity,,VTL,Manley,Belles 350 a reference,,etc-- good luck :)
    JC approves....he told me so. (F-1 nut)
  • tonybtonyb Posts: 31,441
    edited October 2010
    I agree with George. Plus in bridged mode,the amps may not handle less than 8 ohms very well. Spend the cash on a better amp.
    HT SYSTEM-
    Sony 850c 4k
    Pioneer elite vhx 21
    Sony 4k BRP
    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
    Grant Fidelity tube dac
    B&k 1430
    Tad 803 speakers
  • george danielgeorge daniel Posts: 11,992
    edited October 2010
    I've actually run a pair of 2.3tl's with bridged adcoms--IMHO-it was not worth the time/effort,,it lasted all of 20 minutes,,let us know what you do. :)
    JC approves....he told me so. (F-1 nut)
  • Viking64Viking64 Posts: 4,251
    edited October 2010
    I've actually run a pair of 2.3tl's with bridged adcoms--IMHO-it was not worth the time/effort,,it lasted all of 20 minutes,,let us know what you do. :)

    Well, I guess I won't be perusing Craigslist for a twin 555!!! :D

    Thanks everyone for your input.
  • george danielgeorge daniel Posts: 11,992
    edited October 2010
    Are the croosovers upgraded,and do you have the replacement tweeters,,if not,,might I suggest you spend the money on sonicaps,mills,and RDO 198's,, I think that you will be more than pleased with the results.
    JC approves....he told me so. (F-1 nut)
  • Viking64Viking64 Posts: 4,251
    edited October 2010
    Are the croosovers upgraded,and do you have the replacement tweeters,,if not,,might I suggest you spend the money on sonicaps,mills,and RDO 198's,, I think that you will be more than pleased with the results.

    Everything is original except I have fried and replaced one tweeter in each cabinet and I put an inline fuse in to prevent it from happening again (per someone at Polk circa 1994).

    I have read about the RDO 198's for the first time on here today and I am interested. Where can I find them? Also, can you please define "sonicaps" and "mills" for me? :o
  • OsarionOsarion Posts: 160
    edited October 2010
    You can order the RDO's from Polk at the # at the top of the page. Sonicaps are a brand of capacitor and mills are the brand of resistors that are recommended to upgrade the crossovers.
  • george danielgeorge daniel Posts: 11,992
    edited October 2010
    here you go--sonicap brand of capacitors and mills resistors,,your caps and resistors are getting close to 20 years now.A significant upgrade awaits your ears :)


    http://www.soniccraft.com/sonicaps.htm

    http://www.soniccraft.com/mills_resistors.htm
    JC approves....he told me so. (F-1 nut)
  • F1nutF1nut Posts: 42,695
    edited October 2010
    Do the crossover upgrades and the RDO198-1 tweeters. Then, apply Dynamat Extreme to the stamped steel baskets, upgrade the binding posts and install Larry's rings. You'll think you died and went to audio heaven. Oh yeah, a different amp would be a good idea 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

  • dpowelldpowell Posts: 2,818
    edited October 2010
    F1nut wrote: »
    Do the crossover upgrades and the RDO198-1 tweeters. Then, apply Dynamat Extreme to the stamped steel baskets, upgrade the binding posts and install Larry's rings. You'll think you died and went to audio heaven. Oh yeah, a different amp would be a good idea too.

    +1 What he said.
    ____________________________________________________________
    polkaudio Fully Modded SDA SRS 2.3TL's + Dreadnaught, LSiM706c, 4 X TC265i Rears, SVS PB13 Ultra x 2
    Pass Labs X1, Pioneer Elite SC-67, Sunfire Signature Cinema Grande 400, Oppo BDP-83SE, Sony SCD-C333ES
  • Viking64Viking64 Posts: 4,251
    edited October 2010
    Thanks everyone. I will take some time and do some research on this site and upgrade as recommended. Both the bass radiators and the mids were manufactured in June, 1989 so there is definitely some aging involved. I haven't had my whole system set up since 2003 and the 2.3's have been in storage in a non-climate controlled unit in Florida all of these years. I may have even more work cut out for me. I am back in my home state and I am going to spend the winter in a huge house in the country with a windowless room of ideal proportions for my gear. :P

    P.S. - Santa Claus will be bringing me a tube amp this Christmas I assure you. :)
  • Viking64Viking64 Posts: 4,251
    Sorry if bumping old posts is frowned upon. :D I wanted to update this thread. I have been reading a lot of related 2.3TL stuff and I have decided to dive into the world of that lovely amber glow. Last night I ordered an MS38SE from Ray at Silk Audio. It is already on it's way to me. :) I have NEVER heard a tube amp in ANY home stereo and I am very excited.

    Today I ordered the Fortress crossover mod from Trey(?) at Vr3 Mods. That amp should be approaching a sweet state of burn-in by the time that build is complete. Do my ears even deserve this? HAHAHAHA

    Meanwhile, I plan to update the SL3000's to the proper RDO's. I read somewhere on here where someone recommended disconnecting 2 of the 4 tweeters in a pair of 1.2TL's. Has anyone heard of a similar recommendation for the 2.3's? Or should I just go ahead and buy all 6?

    I have seen photos of a Dynamat mod, and that too is on my list. That leaves hurricane nuts and Larry's rings. Can anyone point me in the right direction for both of those?

    I will do some more research as far as what do do about glue deterioration and wandering magnets, or whatever the term was. :D I added the floor spikes for the first time ever yesterday, and there was a nice improvement as far as low-end punchiness.
  • Viking64Viking64 Posts: 4,251
    Reading my sig, I have to laugh. :p After 23 years, my Adcom GFA555II died last year. I currently don't have my rear speakers or sub hooked-up. And I never use my center speaker, as movie vocals sound better through my 2.3's than my little, dinky CS400. I guess I have become a 2-channel man by default. HAHAHAHA What a perfect time to upgrade the SDA crossovers and "tube it".
  • agfrostagfrost Posts: 2,269
    There are people more knowledgeable about the 2.3TL than I, but I'll take a shot...

    •No benefit on doing less than all the tweeters--buy all 6: "In for a penny, in for a pound!"

    •Larry makes rings "periodically" and the period differs. You can inquire as to whether he has a set for your speakers at the moment, but if not you will have to wait... He makes them in large bunches when demand, his workload, and his equipment availability all come together.

    •There are a lot of threads about preventing magnet shift. This thread shows the "current state-of-the-art" in material (Loctite Power Grab) and technique (where to put it).

    •"Do my ears even deserve this?" --I can't answer that one. If you've been nice to your family, your coworkers, and animals you're probably OK. You may want to donate a few bucks toward Harvey disaster relief funds just to be safe.

    Anyway, enjoy the journey! You're making some significant changes (crossovers & amplification), so your listening experience should definitely be different. Post back after you've had your ears on things for awhile, I for one will enjoy reading your impressions.
    Jay
    SDA 2BTL * Musical Fidelity A5cr amp * Marantz DV-9500 * Modded Adcom GDA-600 DAC * Rythmik F8
    Micro Seiki DQ-50 * A hodgepodge of cabling * Belkin PF60
    Preamp rotation: Krell KSL (SCompRacer recapped) * Manley Shrimp * PS Audio 5.0
  • Viking64Viking64 Posts: 4,251
    Thank you, Jay! I appreciate your advice. The amp should be here soon. I expect that I will be very impressed right out-of-the-box. My Yamaha integrated amp, that I am now using to power the 2.3's, is itself almost 20 years old, so there seems to be vast amounts of room for improvement. I'll keep updating as things progress.
  • pitdogg2pitdogg2 Posts: 14,332
    Yea do all tweeters doesn't make sense to just do a few and unhook the rest. It's a progressive point source so not all play at the same loudness. IIRC
  • michaeljhsda2michaeljhsda2 Posts: 1,923
    Nice choice on the tube amp! The only speakers that improve by disconnecting the dimensional tweeter are the SDA 2's (maybe the older SDA 1's, not sure though) with the side by side tweeters.
    SDA SRS 1.2TL's
    SDA 1C's w/Clarity Cap ESA; PA, Mills, RD0194-1's
    SDA 2B TL's w/RD0198-1's
    Yaqin MC-30L integrated tube amp
    Yaqin MS-20L integrated tube amp
  • machonemachone Posts: 1,128
    Nice choice on the tube amp! The only speakers that improve by disconnecting the dimensional tweeter are the SDA 2's (maybe the older SDA 1's, not sure though) with the side by side tweeters.

    My SDA-1A's improved with the dimensional tweeters disconnected.

    Mojo Audio Illuminati v3>>Quantum Byte w/LMS>>Rpi/PiCoreplayer>> Starlight 7 USB >> Mojo Audio Mystique v2 SE>>ModWright SWL 9.0 SE Signature>>Hafler DH-500 Amp+ (Musical Concepts Fully Modded)>>
    SRS 2.3TL (Fully Modded)...SDA-1A (Fully Modded with Dimensional Tweeter Delete)
    1KVA Dreadnought
    Marantz SA 8005
    Pioneer PLX-1000 Turntable - Shure SC35C/N35X - V15III/VN35HE
    Yamaha TX-540 Tuner...Sony BDP-S570
    Sony PS4

    Separate subpanel with four dedicated 20 amp circuits.
    1. Amplification 2. Analog 3. Digital 4. Video

    "All THAT IS LOST FROM THE SOURCE IS LOST FOREVER"
  • pitdogg2pitdogg2 Posts: 14,332
    Nice choice on the tube amp! The only speakers that improve by disconnecting the dimensional tweeter are the SDA 2's (maybe the older SDA 1's, not sure though) with the side by side tweeters.

    any that has dimensional tweeters yes SDA1 SDA1a
  • dpowelldpowell Posts: 2,818
    I bi-amp my 2.3TL's with a Sunfire Signature Cinema Grande 400x5. It has dual outputs for each channel which give you the option of a more solid state sound from one output and a more tube sound from the other. Mine are setup with SS for Bass and the tubey goodness sound for the highs/mids. Because the amp allows you to pass the signal through from one channel to another with a simple interconnect, it makes bi-amping a breeze. The sound is phenomenal.
    ____________________________________________________________
    polkaudio Fully Modded SDA SRS 2.3TL's + Dreadnaught, LSiM706c, 4 X TC265i Rears, SVS PB13 Ultra x 2
    Pass Labs X1, Pioneer Elite SC-67, Sunfire Signature Cinema Grande 400, Oppo BDP-83SE, Sony SCD-C333ES
  • Viking64Viking64 Posts: 4,251
    dpowell wrote: »
    I bi-amp my 2.3TL's with a Sunfire Signature Cinema Grande 400x5. It has dual outputs for each channel which give you the option of a more solid state sound from one output and a more tube sound from the other. Mine are setup with SS for Bass and the tubey goodness sound for the highs/mids. Because the amp allows you to pass the signal through from one channel to another with a simple interconnect, it makes bi-amping a breeze. The sound is phenomenal.

    I see you have "Modded SDA SRS 2.3TL's". What have you done? So far, I have ordered updated crossovers and six RDO tweeters.
  • dpowelldpowell Posts: 2,818
    Gimpod XO boards with Sonicaps and Mills
    Larry's rings
    Dynamat all drivers
    VR3 Mods binding post plate/connectors and Speakon connector for dreadnaught
    1000k dreadnaught with larry's custom box
    RDO-198 tweeters

    Last thing I need to do is replace the SDA inductors
    ____________________________________________________________
    polkaudio Fully Modded SDA SRS 2.3TL's + Dreadnaught, LSiM706c, 4 X TC265i Rears, SVS PB13 Ultra x 2
    Pass Labs X1, Pioneer Elite SC-67, Sunfire Signature Cinema Grande 400, Oppo BDP-83SE, Sony SCD-C333ES
  • Viking64Viking64 Posts: 4,251
    Nice! How much Dynamat was needed to do all 12 drivers? Did you do the sub bass radiators also?
  • dpowelldpowell Posts: 2,818
    Seems to me it took 2 or 3 sheets of it. I did the bass radiators. With all the mods complete, the 2.3TL's are a phenomenal sounding speaker.
    ____________________________________________________________
    polkaudio Fully Modded SDA SRS 2.3TL's + Dreadnaught, LSiM706c, 4 X TC265i Rears, SVS PB13 Ultra x 2
    Pass Labs X1, Pioneer Elite SC-67, Sunfire Signature Cinema Grande 400, Oppo BDP-83SE, Sony SCD-C333ES
  • dkfreebirddkfreebird Posts: 1,102
    The wedge pack on eBay is more than enough.It is 4 square feet and you should have some left over. The Passive radiators should be done too and if you want to go a step further you can put black hole 5 behind the drivers.
    2 Channel
    Polk 1.2tl's Fully modded with dreadnought
    Rogue Atlas Magnum
    Rogue Magnum 66
    North Star Intenso Dac
    Marantz UD 7007
    Pangea PC
    Wireworld Equinox 7 interconnects
    Wireworld Equinox 7 Speaker Cables and Jumpers
    Home theater
    Marantz SR 5009 Sunfire Signature 425x5-B&W Cdm1nt Cdm Center Channel-Rel Strata iii sub
    Backups Polk Monitor 5 peerless,Monitor 7c,2.3tl,3.1tl,SRS2 pin/blade,Polk Crs+ pin/blade with stands.McCormack Dna 0.5 Deluxe,Dared Sl 2000A,Dayens Ampino
  • Viking64Viking64 Posts: 4,251
    dpowell wrote: »
    Seems to me it took 2 or 3 sheets of it. I did the bass radiators. With all the mods complete, the 2.3TL's are a phenomenal sounding speaker.

    Thank you. I am getting excited. After owning these for almost 26 years, it is certainly due. :D My new Silk Audio tube amp is "out for delivery" via FedEx today.
  • Viking64Viking64 Posts: 4,251
    dkfreebird wrote: »
    The wedge pack on eBay is more than enough.It is 4 square feet and you should have some left over. The Passive radiators should be done too and if you want to go a step further you can put black hole 5 behind the drivers.

    Thank you! I found a thread on the "Black Hole 5". The pictures aren't visible, though. HAHAHA
  • dkfreebirddkfreebird Posts: 1,102
    http://forum.polkaudio.com/discussion/163982/money-well-spent#latest

    This is a link when I did mine.The pics should show you where to put it.
    2 Channel
    Polk 1.2tl's Fully modded with dreadnought
    Rogue Atlas Magnum
    Rogue Magnum 66
    North Star Intenso Dac
    Marantz UD 7007
    Pangea PC
    Wireworld Equinox 7 interconnects
    Wireworld Equinox 7 Speaker Cables and Jumpers
    Home theater
    Marantz SR 5009 Sunfire Signature 425x5-B&W Cdm1nt Cdm Center Channel-Rel Strata iii sub
    Backups Polk Monitor 5 peerless,Monitor 7c,2.3tl,3.1tl,SRS2 pin/blade,Polk Crs+ pin/blade with stands.McCormack Dna 0.5 Deluxe,Dared Sl 2000A,Dayens Ampino
  • Viking64Viking64 Posts: 4,251
    dkfreebird wrote: »
    http://forum.polkaudio.com/discussion/163982/money-well-spent#latest

    This is a link when I did mine.The pics should show you where to put it.

    Thank you! I spy with my little eye an Adcom power amp. HAHAHAHA Are your 2.3's "walnut"? My cardboard freight boxes have the check boxes on them for both "oak" and "walnut", but I have only seen the oak, which is what I have, obviously. :P
  • dkfreebirddkfreebird Posts: 1,102
    Yes, I have all 3 of the tl models in walnut.The Adcom in the pic is long gone and am running a McCormack amp now. You will be in for a treat once you upgrade them, but they are great in stock form too.
    2 Channel
    Polk 1.2tl's Fully modded with dreadnought
    Rogue Atlas Magnum
    Rogue Magnum 66
    North Star Intenso Dac
    Marantz UD 7007
    Pangea PC
    Wireworld Equinox 7 interconnects
    Wireworld Equinox 7 Speaker Cables and Jumpers
    Home theater
    Marantz SR 5009 Sunfire Signature 425x5-B&W Cdm1nt Cdm Center Channel-Rel Strata iii sub
    Backups Polk Monitor 5 peerless,Monitor 7c,2.3tl,3.1tl,SRS2 pin/blade,Polk Crs+ pin/blade with stands.McCormack Dna 0.5 Deluxe,Dared Sl 2000A,Dayens Ampino
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!