1. avatar palrub
    bass amp - can i run active bass through active port and run amp through desk from line out or such??

    new gear, not atune to this active gaffe.
  2. avatar stevie j
    Yeah, take the XLR out of the amp and into the desk.

    IMO the DI out of a good amp sounds better than a bass DI'd directly.
  3. avatar Jimmy Seagus
    Going out on a bit of a limb there, stevie j.

    It depends greatly on the quality of the preamp stage of the amplifier, and whether that output is balanced (XLR) or unbalanced (line out) 'cos that's where your signal will be coming from.Preamps will influence the quality of the signal and even the better ones, Ampeg/ GK/ Ashdown, etc. can be quite noisy or prone to damage/dust.
    You'll also want to make sure your preamp out signal to the mixer is at least pre/post EQ switchable. Don't bother sending the signal to places where it doesn't need to go.
    If you're using FX pedals it avoids a lot of fucking around to take the signal post amplifier preamp or indeed use the FX Loop out.

    Ideally though, get a good DI designed specifically for active impedance transformation (Radial/ KT/BSS) and take the signal directly from the guitar pickup to the balanced input on a desk channel and mic the speaker also.
  4. avatar Leif Bodnarchuk
    I used to think all DI boxes were the same, but my FOH friend told me a few things that make sense. A DI changes an unbalanced signal (2 wires) to balanced (3 wires). This is achieved by means of an internal amplifier and small transformer - the tranny has a standard two wire primary with a centre-tapped secondary. The two ends of the secondary give you two signals, in opposite phase when the centre tap is earthed. That goes to your XLR out.

    The quality of the inner workings of the box determine greatly the quality of signal you get out of the box. A DI with a pad will be useful as will one with an earth lift for getting rid of earth loop hums.

    But as far as conventional wisdom goes, I don't think there's anything wrong with plugging an active bass into a DI unless it's a really nasty and really cheap DI. <cough, Behringer!> We used Behringers, but they clipped at the input when handling some line levels. Buyer beware.

    Sorry about the rambling. Info is good.
  5. avatar Pete
    A good DI makes a huge difference, I use an Avalon U5 and Radial JDI in the studio and the difference between them and the DI on my Ashdown amp is like night and day... the DI on the amp can be switched to post EQ though and is definitely post the preamp stage which means it would be feeding the "sound" of the amp to the DI output.

    The difference between passive and active basses that matters with regards to DI is the input impedance and how that loads a pickup. In general a passive bass will benefit from a good active DI while an active bass with sound better with a good passve DI. You can read about why here :

    http://www.radialeng.com/pdfs/Selecting-a-DI-box-for-bass.pdf