clipping ISA 428

Discussion in 'Preamps / Channel Strips' started by willjrockstar, Dec 25, 2007.

  1. Hey folks i just bought the focusrite ISA 428 about a month ago and the damn thing doesnt seem to work properly.

    Ive tried different mics, cords ,configurations and what im getting is a clipped signal half way up the meter(-8). It almost sounds like it is being overly compressed. This seems to be most problematic in the low end,but the general description is static,and muffled.

    Ive tried diff impedance settings, diff mic channels , cords , mics, even tried switcjing the fuse in the back as it allows 4 different positions.(two of which may be useable for me.)

    thanx in advance
    ps where that smile face resides is suppoed to be an 8.dont know whats up with that
  2. BRH

    BRH Active Member

    Aug 16, 2006
    LA, CA
    Can you provide more information, what mics? what do you have it going into? What are you recording?
  3. moonbaby

    moonbaby Mmmmmm Well-Known Member

    Feb 23, 2005
    Note: You have to put an extra space in between the "-8" and the parentheses to ditch the emoticon...
    Are you using it with the optional A/D card? Is there any processing plugged into the inserts? As far as the meters are concerned, do they seem to correlate with the LED metering? Like BRH indicated, we need more info...
  4. sure guys thanks, um let see... i tried using sm57 , 58, 81, beta 52 with a good XLR cable in and a good XLR cable out into the firepod with the gain the whole way down on the firepod. This 'clipping', seems most prominent on bass instruments but a vocal mic will do it just as easily ,especially using the beta 52 with the vocals(just for test).Bass frequencies seem to do a better job of clipping the unit but it always sounds muffled or smashed.

    The meter and lights seem to correlate real well,and i also tried running into a different mixer(yamaha md 8)and listening via phones. same result,distorted sound.I am not using the optional A/D card.

    one other note, i had a compressor(266XL) with a bad cable in the insert path while speaking through a sm58 ,the clipping was horrendous.When i took the compessor out of the path entirely, the noise lessened.
  5. BRH

    BRH Active Member

    Aug 16, 2006
    LA, CA
    The reason it's clipping is that you are most likely running a line level signal out of the ISA into the firepod mic input!
    Using an XLR into the firepod is mic level about 50db too hot.
    Use an XLR out of the ISA to 1/4 TRS into the firepod.
    "Level all the way down" on the firepod is a dead giveaway, you are overloading the mic pres in the firepod.
  6. Jbrax

    Jbrax Guest

    But isnt it true that even if he goes TRS, he's still going to be hitting the mic pre's on the firepod? As the line ins and the Mic pre's on this unit are 1 in the same.
  7. Ill try it right away
  8. it sounds better for sure but still not right.
  9. also thank you and merry christmas
  10. Jbrax

    Jbrax Guest

    Merry Christmas to you too.. I think to use your
    ISA another converter might be in order.
    FireStudio will work. Its line ins are not the Same as the Mic pre's.
  11. hey J, i noticed yr working on nuendo 3. i could use some help there too.
  12. well just to let you guys know, Mr BRH was infact 100 % correct on the reason i was hearing a clipped signal. the reason why it didnt work right when i first attempted to set it up his way was a bad cord. Why didnt i know this(these) cord(s) was bad before? It worked fine for every other application. Matter of fact ,i have a few cords that wont work in the studio but work ok for live sound or running straight into the firepod.Wont work with the ISA though.Another note is that when rigging into the firepod this way , you must use inputs 3 through 8 as jax 1&2 are istrument level.

    thanks for helpin me out

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