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Manley Tube DI: Can it Feed a Power Amp???

Discussion in 'Amps and Cabs [BG]' started by jokerjkny, Jan 6, 2004.

  1. jokerjkny


    Jan 19, 2002
    NY / NJ / PHL
    hey all,

    in my search for that pristine sound from bass to cab, i've been thinking of being a little different and using a Manley Mono Tube DI.


    but i've never been good with specs, and am trying to see if it'll feed my new yet slightly used QSC power amp (thx Daytona!). i'm thinking it will, since many guys are using the Avalon U5, but can anyone help me make sense of these specs?

    Manley Mono Tube DI:

    Gain: -6dB or -26dB
    Input Z: 10 M ohm to 1 M ohm
    Output Z: 150 ohm xfmr
    12 Hz -15KHz @-3dB
    EQ: LF rolloff -3dB points: 12, 42, 100, 250Hz
    Transformer-Coupled Balanced XLR Output
    Console Out Boost Switch
    Ground Lift Switch

    QSC PLX1602 power amp:

    Input Impedance 6 k ohms unbalanced, 12 k ohms balanced
    Input Clipping 10 Vrms (+22 dB)
  2. billys73


    Apr 25, 2003
    Like any true D.I., it has no gain. In fact, it drops the signal down to mic level, which is generally considered -40. This is what your mic pre is looking to amplify.
    You should not use this (or any D.I.) to drive a power amp.
    Won't work well, if it works at all.

    Think of your bass putting out between -20 and 0.
    The Manely drops it from -6 to -26 so that the mic pre is happy. Power amp, unhappy!

    The Avalon seems to be more like a preamp with a balanced output than a normal D.I. It has gain!