To Boost or Not

Discussion in 'Home Theater Projects' started by Stuart Mundy, May 19, 2003.

  1. Stuart Mundy

    Stuart Mundy Agent

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    Need advice I've just finished Adire Shiva 142litre EBS tuned to (hopefully) about 18hz with 20" 4.5" non flared port.
    Im powering this with a 350W plate amp brought from Jaycar here in OZ it states that it has a boost of 6db @ 35Hz, what affect will this have on sound etc ? Can it be disabled ?
    Cheers
     
  2. TimForman

    TimForman Supporting Actor

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    The 35 Hz frequency is frequently boosted to provide the impression of "more" bass. It gives the punch many people expect, especially during movies. From a purist point of view the role of an amplifier is to reproduce exactly the signal being fed to it and not add or subtract anything. One question is; how does this play in your room? The second question is; how does it sound to you? In the final analysis what counts is whether you enjoy the boost or not. If your goal is accurate bass then the first thing to do is get an SPL meter and some test tones and run some tests to find out exactly what's happening. Then you can take steps to correct any peaks or dips.
     
  3. AllanRW

    AllanRW Second Unit

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    Having just talked with Dan from Adire on a few designs I have on the go.
    Go with the boost down at 20-25 if you can.
    This was the recommendation of his to me.

    Al
     
  4. Stuart Mundy

    Stuart Mundy Agent

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    Thanks Tim and Allan, many thanks for your helpful relies and to everyone at this forum I have found it to be most helpful.
    It certainly is an interesting hobbie this DIY stuff.
    The sub sounds fine to me with heaps of what I percieve to be low down grunt.I have a SPL meter at home I will run some test tones to see how far down it is going.
    I was concerned that I would miss out on some bottom end with the boost enabled.
    My other sub is a sealed 88litre shiva and this baby is as expected completly diferent in how it performs, the sealed jobby is only used for music, and the EBS for movies so I am looking to get the most realistic sound from it .
     
  5. TimForman

    TimForman Supporting Actor

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    Sounds like a good plan to me. I run two different subs too. One for music, both for movies. They're on opposite ends of the room with furniture in between so for movies I get tons of bass without localization or any frequency cancellation, that I can perceive anyway.
     

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