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Question for Feedback detroyer owners

Discussion in 'Home Cinema Speakers' started by Jeff, Jan 22, 2003.

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  1. Jeff

    Jeff
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  2. Apocalypse

    Apocalypse
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    For me all I want to do is supress the bass peaks, both products do that but the feedback destroyer is cheaper. I wouldn't know where to begin with the other one as it looks a lot more complicated, having said that it's not too late to change my mind as the feedback destroyer hasn't been sent yet so if anyone has any valid reasons for choosing the more expensive model I'm all ears (or eyes as the case may be) :)
     
  3. Jeff

    Jeff
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    I was looking at

    DSP8024

    System Bandwidth: 20 Hz to 20 kHz (+0/-0.5 dB)
    Signal to Noise Ratio: 103 dB unweighted, 22 Hz to 22 kHz
    THD+N: 0.004 % @ 1 kHz / +4 dBu
    Crosstalk: < -103dB, 22 Hz to 22 kHz


    Feedback Destroyer

    Bandwidth: 20 Hz to 20 kHz, -3 dB
    Noise: > 94 dB, unweighted, 20 Hz to 20 kHz
    THD: 0.0075 % typ. @ +4 dBu, 1 kHz, Gain 1
    Crosstalk: < -76 dB
     
  4. GaryG

    GaryG
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    They are not quite the same product. The BFD has 2 x 12 Parametric equalisers, this product has 2 x 3 parametric equalisers.
     
  5. NicolasB

    NicolasB
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    This discussion has escaped from another thread. I hope it hasn't been genetically modified....

    The following might interest you. Extracts from email sent between me and one of Behringer's tech support people.

    It looks as though the 8024 will cover not just the setting up of Parametric EQ, but also the actual measuring process as well - that you would need to go through in order to figure out where the peaks and dips are. However, having said that, I think the 8024 offers fewer parametric EQ bands - 3 per channel rather than 12. (It has a 31-band graphic equalisr instead).

    I like the bit that says "Automatic Room Equalization using mic input and internal noise generator".
     
  6. GaryG

    GaryG
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    Just so we're all singing from the same song sheet as they say:

    Graphic equaliser: The filters have a fixed frequency and fixed bandwidth only the gain (boost/cut) is adjustable.

    Parametric equaliser: The filters frequency, bandwidth and gain is fully adjustable.


    When equalising your room a parametric filter will allow you to set a more accurate mirror image of the peak or trough (assuming the trough isn't a room null) to cancel the offending frequency.

    You may need more than the 3 parametric equalisers to eq your room. The graphic equaliser section is just a refinement of the tone control to adjust the sound to taste after equalisation.
     
  7. Jeff

    Jeff
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    The ecm8000 mic costs £40, combined with the 8024 will give you a high precision SPL meter that is accurate to +- .25db.
     
  8. Apocalypse

    Apocalypse
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    Would the human ear tell the difference between the level settings of a Radioshack SPL and this Behringer combo? Science says the human ear can detect a change in noise level if it's +/- 3Db so is a 0.25DB variation really gonna be noticed :confused:
     
  9. JSW

    JSW
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    A good condenser mic and some free software for yer pc will give you a much better SPL meter and more information.
     
  10. Jeff

    Jeff
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    I thought people with radioshack SPL meters were using a conversion table, it would be nice to do without.
     
  11. Nic Rhodes

    Nic Rhodes
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    can't you use the line out and avoid the conversion tables?
     
  12. Apocalypse

    Apocalypse
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    You've probably never heard this before Beekeeper but can you go into more detail please :)
     
  13. uncle eric

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    Ring any bells? Maybe Poda's perhaps.
     
  14. JohnS

    JohnS
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    Have you got a suggestion of a suitable one?
     
  15. Nic Rhodes

    Nic Rhodes
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    Not today please ;)

    Ever since I spoke to GaryG about this I have ben seriously interested in what this box can do. It is a toss up between one and Tags TAMREQ. Feedback destroyer looks stunning value for the potential gains though

    There is some excellent info on this subject on this that feedback owner could buy into (even non Tag owners).

    Have a look at the excellent TAMREQ manual and several posts on this

    re the line out comment it came from something John Mulcahy, Head of Engineering, TAG McLaren Audio said in a post called

    TMREQ - Can it be made simpler?

    I thought it might be applicable here and make things simpler. Tag seem to be advocating line out from Tandy sound meter into sound card and a shareware prog to solve all the issues, thought it looked a good approach that all could use. No correction, nothing. The quality of kit doesn't seem to be the limiting factor, Udo uses his laptop! Most of us have all this kit already.

    let us know what you think
     
  16. JSW

    JSW
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  17. Apocalypse

    Apocalypse
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    I assume the phono output on the Radioshack SPL would be used for a microphone of some sort then, if that's all that's needed I'll certainly look into it, thanks Beekeeper.
     
  18. Guest

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    Ah missed that one Eric:D

    I have never said, as you know, that RCS should come before treatment of the room:rolleyes:

    It's just that most of us are unable to cover the walls of our living room with 3-D diffusers, Bass Traps and assorted corner fills and broadband absorbers.

    Even if I could, I'd then have the problem of time alignment and symetrical sound distribution:rolleyes:

    Now if room treatments are the be all and end all of this, then why are some of the top studios using monitors that derive their response, crossovers and delays from DSP;)

    The best results IMHO will come from a combination of room treatment and digital correction. Please feel free to comment when you have experience in this field;)

    I feel a Parametric Equalizer should be part of any subwoofer set up, the Behringer seems to be very good value for money in this context.

    Regards

    M
     
  19. Jeff

    Jeff
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    I've gone ahead and ordered the 8024 and a ECM8000 Mic. I'll post my findings once I've had a chance to play.

    Jeff

    [edited by rjw with permission of poster]
     
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