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Schroeder distorting - where's the overload?

Discussion in 'Amps and Cabs [BG]' started by jammadave, Dec 16, 2004.


  1. jammadave

    jammadave Rudderless ship Supporting Member

    Oct 15, 2003
    Wash DC metro area
    hey guys -

    Okay, here's the deal. Whene'er I turn up the bass knob on my Fodera, even an open A makes my Schroeder distort. Not quite Big Muff distort, but moreso than Geddy's typical Sansamp drive.

    So I'm wondering where the issue could be...

    I don't think it's overdriving my ME50B or I'd get some digital noise, I figure - plus I've got a slight comp/limit set up on there...

    The input light on the iAmp stays all green, and the input setting is straight at noon.

    The output on the iAmp is set usually at about 9:00 for bedroom playin'.

    I don't know what it could be, and haven't tested with other basses yet. Can the speaker flap at well under the rated power? (1210's are rated at 700-750W I think, and my iAmp is 500 into 4ohms at full tilt.)
     
  2. Schwinn

    Schwinn

    Dec 4, 2002
    Sarasota, FL
    do you hear it out of the 12 or the 10, or can you tell?
     
  3. jammadave

    jammadave Rudderless ship Supporting Member

    Oct 15, 2003
    Wash DC metro area
    Can't tell - will try to investigate more closely this evening, just noticed it last night.
     
  4. Dave;

    please email me (JSCHRO7376@MSN.COM); if there's anything I can do I'll be glad to help.

    thanks

    Jorg
     
  5. jammadave

    jammadave Rudderless ship Supporting Member

    Oct 15, 2003
    Wash DC metro area
    Oh sure thing Jorg! Definitely not trying to say your speaker failed, hence why I am trying to track down the overload point from a full-chain aspect. I'll email you with results as soon as I test out some more scenarios.
     
  6. I understand, Dave;

    Please keep me posted; I'll be glad to assist you in every way I can.

    thanks

    Jorg
     
  7. brianrost

    brianrost Gold Supporting Member

    Apr 26, 2000
    Boston, Taxachusetts
    It could be that the pre is boosting frequencies too low for the speaker to reproduce. Is the Schroeder ported? Ported cabs are infamous for distorting if you try to drive them below their cutoff frequency.

    How much bass boost are you dialing in? Keep in mind every 3 dB boost doubles the power required. A max 15 db boost (common on many pres) means you need 32 TIMES the power :eek: If it's a narrow frequency band being overdriven, it's possible the amp clip light might not trip (depends on how the circuit is designed).
     
  8. If you're playing it at quiet 'bedroom levels' then that may be the problem - not giving the speakers enough juice to produce the lows well and they're distorting.

    Does the same problem occur at higher volume levels?
     
  9. jammadave

    jammadave Rudderless ship Supporting Member

    Oct 15, 2003
    Wash DC metro area
    Well, I'm not just taking the bass boost on the axe and cranking it all the way, it's more like taking it from noon to 3:00, sometimes less. Makes the Fodera more ballsy when needed.
     
  10. jammadave

    jammadave Rudderless ship Supporting Member

    Oct 15, 2003
    Wash DC metro area
    Well, my idea of bedroom level is still loud enough to be heard throughout the house if I don't shut the door. =0)

    More info tonight - thanks all for the suggestions, and of course Jorg for being the cool guy on the service end.
     
  11. Battery in the bass getting low?? Did you try bypassing the effect pedal?
     
  12. always check that, i know your no noob, but i always overlook that and wonder why my bass sounds like crap.
     
  13. Bob Lee (QSC)

    Bob Lee (QSC) In case you missed it, I work for QSC Audio! Gold Supporting Member Commercial User

    Jul 3, 2001
    Costa Mesa, Calif.
    Technical Communications Developer, QSC Audio
    :confused: :confused: :confused:

    That doesn't make any sense, bro. :eyebrow:
     
  14. +1
     
  15. jerry

    jerry Doesn't know BDO Gold Supporting Member

    Dec 13, 1999
    Hawaii
    Your 500 watt amp should be fine with the 1210. I've gigged with my Thunderfunk and the 1210, and it sounded great, and the TF is 400 watts. I also use a Demeter/QSCPLX with a ton of power, and no problems there either.
     
  16. Schwinn

    Schwinn

    Dec 4, 2002
    Sarasota, FL
    My first instinct is to suspect a problem with the bass, but it could be a lot of things. Since you are not talking about ridiculous volume levels (like the kind I subject my cabs too, lol) than I would look at the bass and the preamp gains first.
     
  17. James Hart

    James Hart

    Feb 1, 2002
    toms_river.nj.us
    Endorsing Artist: see profile
    Why do you think it's the cabinets? How much boost does your pre put out? How's the output of the battery? Does you other basses do the same? Does your set up do the same with a different cabinet?

    my bet is on the ME50B

    (I've beat my 1210 with 1100 watts without hiccup)
     
  18. babaseen

    babaseen Don't mean a thing if it ain't got that swing Supporting Member

    Apr 15, 2001
    Boston, MA
    Had a similar problem...thought it was the iAmp. Did you try it with a different cab? Luckily in my situation, the distortion is not obvious in a band setting...only when I play unaccompanied like at home...working on tone settings.
     
  19. Bassic83

    Bassic83

    Jul 26, 2004
    Texas, USSA
    Might be a long shot, but it's happened to me...bad cord? I had a bad speaker cord once, sounded like crap, plus my volume dropped. Had a bad signal cord the next month, it distorted some, but not if I stood on it...the battery is a good place to start as well. Good luck tracing it down.
     
  20. Chris Fitzgerald

    Chris Fitzgerald Student of Life Staff Member Administrator

    Oct 19, 2000
    Louisville, KY
    The obvious thing to do is to try different pieces of the signal chain until you pinpoint the problem are. Start with the battery, then -->patch cable--> Different bass at same settings-->different preamp setting in the iAmp (make sure you check the "Deep" button - that thing boosts the **** out of 50hz, and could be your problem if the pre is set too hot)--->Different amp head if possible--> Different speaker and cable.

    I've experienced a pretty serious flux in sound when adjusting the pre settings on my iAmp800. It may turn out that you have a "gain staging" issue between your onboard pre and the iamp pre. The fortunate thing here is, you're dealing with two companies (Schro and Euphonic) that are well known for excellent customer service if it turns out there is an actual problem with either unit. Best of luck.