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Thread: Passive Preamps

  1. #61
    Join Date: Apr 2013

    Location: Solihull, UK

    Posts: 357
    I'm Bob.

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    Quote Originally Posted by Macca View Post
    Nothing's simple in hi-fi land.

    ................. A system that is technically perfect in every respect (if it existed) may not give the sound you want. So what use would it be to you?
    None whatsoever. Agreed.

    But I can remember the days when you dare not set foot outside the door without checking the numbers to see what would work with what. Then we went through a perceived phase of almost anything worked with anything: now I think we're back to having to pay a bit more attention to the numbers again.

    Or maybe it's just me and I'm fishing in a different pond ...............
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  2. #62
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 1,337
    I'm Chris.

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    Quote Originally Posted by bob4333 View Post
    None whatsoever. Agreed.

    But I can remember the days when you dare not set foot outside the door without checking the numbers to see what would work with what. Then we went through a perceived phase of almost anything worked with anything: now I think we're back to having to pay a bit more attention to the numbers again.

    Or maybe it's just me and I'm fishing in a different pond ...............
    Paying attention to the numbers, more than ever as you say is the thing to do.
    Some figures for considering. If contemplating

    A passive attenuator then power amp sensitivity needs to be ideally below 1v and resistive loading 20k or greater, a Quad 306 is just the best specified being 375mv and 20k loading.
    The 303, 405, 306, 606, 707, 909 all offer good specifications for passives. Why other manufacturers cannot also do this ... starts to get political... Wot ! politics in HiFi ?

    Sadly HiFi dare I say is quite political in its own way, namely active pre amp manufacturers want to remain in business, so their or similar power amps are made with 2 volt sensitivity or higher, the
    worst I have seen was 3.5v for full output, this automatically means one of two things matching the insensitive power amp with a active preamp or using a current buffer - either way they remain
    in business reinforcing their equipment.

    However phono preamps are still needed, and stand alone phono preamps make a lot of sense.

    So my advice is to, hunt down those power amp sensitivity and resistive loading figures - if you want to use a passive ... er as you should.

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