Bass boost vs BFD question

Discussion in 'Archived Threads 2001-2004' started by Wes Nance, Mar 11, 2002.

  1. Wes Nance

    Wes Nance Stunt Coordinator

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    Hi,

    I'm settling in with my Stryke 1204 PR sub, and am trying to get a handle on the sub's response in my room. It definitely drops below 25hz, and I'm sure it's a result of the 20hz f3 of the stock boost setting on my PE 250w plate amp combined with my room response.

    I think eventually I'll get a Behringer Feedback Destroyer and EQ for the room, but I'm wondering if in the meantime it would be worth it to change the amp's default boost level, to a 1 or 2 db boost around 21hz or so (fb for this sub) which would net me around 4 or 5 db at 20hz.

    This would bring the response level a bit more uniform throughout the range to crossover at 80hz, although I've got a big (6db or so) peak around 28hz and a big (6db or so) dip around 56hz.

    Should I just wait till I have the BFD and eq everything from there?

    Thanks for the help. . .

    Wes Nance
     
  2. Wayne A. Pflughaupt

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    Wes,

    No need to wait for the BFD to experiment. Do whatever you think sounds best.

    Regards,

    Wayne A. Pflughaupt
     
  3. Wes Nance

    Wes Nance Stunt Coordinator

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    Jack,

    Remind me how your amp is setup from Adire? I remember you saying it's 1db boost at 20hz. What is the corner frequency? I've been modeling a bunch of different values in Excel to try to come up with something that still rolls off below fb, but doesn't hurt response down to 20hz, or even has a small boost there.

    Thanks-

    Wes
     
  4. Wes Nance

    Wes Nance Stunt Coordinator

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    Jack,
    Thanks for the info- I figured it might be good to see what Dan came up with for the default on his version of the amp.
    The link to the Excel stuff is here:Excel sheets It's the plate amp filter link. Pretty helpful.
    I looked at Rudy's mod from the PE board, but I think I'm more concerned about the rolloff of the HP filter with a PR sub than the LP filter. . .
    Wes
     
  5. Wes Nance

    Wes Nance Stunt Coordinator

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    Jack,

    I'm trying to decide whether to go for flat response from the amp, with a gentle roll off below fb, or some sort of boost.

    For a "flat" response, try these values for the two resistors:

    80 and 190.

    For 2 db boost, what about 33 and 190?

    I'm a bit leary of the PE supplied values for 2db boost, 47 and 220- I think there's too much boost below fb (21.5hz) for my sub.

    I may just go for the "flat" response, and then fix everything else eventually with a BFD.

    Wes
     
  6. Jack Gilvey

    Jack Gilvey Producer

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