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  1. #1

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    Default Adcom Passive pre vs active

    I have been curious lately about using a passive pre-amp. i currently use the Adcom GFA-565 in my main 2 ch rig. This is used in conjunction with an Adcom GFA555II and SRS 1.2TL's. I understand the GFA750 to be either passive or active depending on user selection of this function. Adcom also made an SLC unit which is strictly passive. I know the 750 is very highly regarded. But is this for the passive operation or its active operation or due to it being selectable for use either way? Is the SLC unit good as a passive unit? And lastly am I wasting my time considering this?

    I have no experience with any passive pre's and am historically used to the Adcom gear I have mentioned above along with carver C-1 and 4.0T, C-2 and 1.0 some Macintosh gear and mostly Vintage Marantz pre's like the 7T, 3250 and some other Marantz integrated in other systems i have through the house. For general listening I usually prefer the sound of the vintage marantz gear but find the bass end a little loose for the Polks. I am trying to determine if i may like the passive pre's or not. I know my ears will naturally be the best judge in the end. I do prefer the Adcom gear best for critical listening, of all my other gear.

  2. #2

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    I have a slc 505 ( used primerily) as a straight line controler, have user spairingly as a pre and i must say it is the only adcom pre i have listeded to that i have cared for. Never heard the 750 but i have seen good reviews on it, having said that. I never cated for the 400 & 600 series that i have had. Did not like the way they " colored" yhe sound especially the highs and base notes they seemed harsh on the highs and boomy in the base to me. Just mho. The 505 is much more neutral but if i were to use it as a pre full time i would upgrade the volume control.
    Main Rig:
    Krell KAV 250a
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    Into JBL L123 drivers
    Rane external crossover.
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    AQ kingcobra ic's
    ADCOM GDA 700 DAC ( MODDED)
    YAMMY CDC-665
    Marantz 6100 tt w/pickering XV-15/625E cart.
    Monster HTS 3600 power conditioner
    POLK RTA-12C'S W/ RDO194 TWEETS, clarity ESA caps mills risistors (full mod)
    MIT exps2 speaker cable

  3. #3

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    Quote Originally Posted by Mr. Bubbles View Post
    I have been curious lately about using a passive pre-amp. i currently use the Adcom GFA-565 in my main 2 ch rig. This is used in conjunction with an Adcom GFA555II and SRS 1.2TL's. I understand the GFA750 to be either passive or active depending on user selection of this function. Adcom also made an SLC unit which is strictly passive. I know the 750 is very highly regarded. But is this for the passive operation or its active operation or due to it being selectable for use either way? Is the SLC unit good as a passive unit? And lastly am I wasting my time considering this?

    I have no experience with any passive pre's and am historically used to the Adcom gear I have mentioned above along with carver C-1 and 4.0T, C-2 and 1.0 some Macintosh gear and mostly Vintage Marantz pre's like the 7T, 3250 and some other Marantz integrated in other systems i have through the house. For general listening I usually prefer the sound of the vintage marantz gear but find the bass end a little loose for the Polks. I am trying to determine if i may like the passive pre's or not. I know my ears will naturally be the best judge in the end. I do prefer the Adcom gear best for critical listening, of all my other gear.
    Hey bubbles,

    The 750 is legendary because of the passive section. It's awesome. Natural, organic, smooth, musical. Good passive pres are only as good as the source. They'll pass along what ever signal your source is giving them. IMO if you're a little shaky on your source, you might want to take care of that first. The Channel Islands VDA-2 is a wonderful DAC that I'm using, I mean, astounding musical sound from my digital music library.

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