Amps with active EQ?

Discussion in 'Amps and Cabs' started by carltonh, Sep 29, 2008.

  1. carltonh

    carltonh Member

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    Most amps have passive EQ, which is the vintage way, but some amps use active EQ in a way that lets them get a broader array of tones including great vintage tones. My experience is with my 22 yr. old X100B. What other amps have active EQ? Don't the 5 band EQ Mesas? Don't some Matchless amps? Let me know which ones and I'll add it to this first post as a list.

    Another question. You might ask if the active EQ is pre or post overdrive, like the X100B is pre overdrive. No Clue about the others.

    List:

    Carvin:
    X100B

    Genz Benz:
    El Diablo

    Kingdom Amps:
    Neuma Standard

    Matchless:
    ???

    Mesa Boogie:
    DC-3, DC-5
    Mark II, III, IV - those with 5 band EQ ??

    Peavey:
    JSX
    Rockmaster Preamp
    Stealth GT50
    Ultra
    XXX

    Rivera:
    Chubster

    Sound City
    Mark II, III, IV

    VHT:
    ones with 5 band EQ??
     
    Last edited: Sep 30, 2008
  2. wickidriffs

    wickidriffs Member

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    I guess the 5-band graphic EQ on a Mesa/Boogie Mark series amp is kinda like an active EQ.
     
  3. Melodyman

    Melodyman Member

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    I think the Peavey XXX has an active EQ
     
  4. Delta2Brewtal

    Delta2Brewtal Member

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    Various Peavey high gainers have active EQ.
     
  5. drbob1

    drbob1 Silver Supporting Member

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    Peavey sold some older amps, too, with the active EQ. Don't remember names now but this would be back in the 70s. Another good idea that never really caught on. I think the problem is musicality: it's easy to design a musical subtractive EQ with makeup gain, active EQ is much harder...
     
  6. alaskagrown

    alaskagrown Member

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    Some vintage amps have an active eq, like the post Mark I Sound Cities. Also, if I understand correctly, the second version of the Sunn Model T have active mids and passive bass, treble, and presence.
     
  7. rockon1

    rockon1 Member

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    My Crates Stealth GT50's, Peavey Ultra's and Rivera Chubster are active on the OD channel. Bob
     
  8. grayeyes777

    grayeyes777 Active Member

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    dc-3 and 5 might have it as well. i know the dc amps sound like crap with it off though.
     
  9. barryoneal

    barryoneal Member

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    FWIW, our neuma Standard has two-bands of tube-driven active EQ in the mid frequencies.

    -barry.
     
  10. carltonh

    carltonh Member

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    I've updated the first post with feedback provided.

    IIRC, the X100B's active EQ are driven by JRC4558s, the Tubescreamer opamp. But, I think, the way they work they are not in the signal path.
     
  11. Delta2Brewtal

    Delta2Brewtal Member

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    Two Peavey's not listed are the JSX and the Rock Master Preamp
     
  12. alaskagrown

    alaskagrown Member

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    Sorry if I wasn't clear - all the Sound Cities except the Mark I have active EQs, so the Mark II, III, and IV have it.
     
  13. carltonh

    carltonh Member

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    I guess because of the particular amps I've used, my experience is exactly the opposite. But then again, the Carvin's active EQ is pre overdrive, and I think the 5 band EQ of the Mesa amps are post overdrive but with standard passive pre overdrive EQ IIRC.
     
  14. barryoneal

    barryoneal Member

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    I've played bunches of amps with passive MID controls that just didn't work like I wanted them to. There's so much going on in those critical guitar frequencies, that I see the ability to really sculpt that range as a powerful tone tool.

    I think BleedingEdge is correct in part. Because active EQs typically provide a greater range of control, using them to good results can require more finesse and effort than passive EQs. It's like Spiderman taught us, "With great power, comes great responsibility."

    All the best,
    barry.
     

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