EBS Tempest frequency response

gatemplin
gatemplin Posts: 1,595
edited June 2004 in Subwoofer Hookup & Bass Management
I finished my DIY sub last week and it is an EBS Tempest with a AVA250 amp and BFD 1124 EQ. This design was done by Adire Audio and it is a vented 340 L cabinet with two 4" flared ports tuned to 16 Hz. The finish is a textured finish similar to the granite coloured SVS subs.

The response is measured at the listening position. The BFD is used to cut a nasty room hump at 50 Hz and to create a house curve which peaks at 21 Hz. I am still working on the response in the 70-120Hz region.

The sub takes about a weekend to build. It uses 2 sheets of 3/4" MDF and it costs less than $500 to build including an amp.

Graham
Post edited by gatemplin on
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Comments

  • gatemplin
    gatemplin Posts: 1,595
    edited June 2004
    This alignment is designed for low frequency efficiency at the expense of output in the 30s and 40s which is the trade off with a low tuning point. The response continues to about 15-16 Hz then drops off. The Y axis is decibels and the X axis is Hertz. The response is corrected and I used the gomer tones.

    C:\Documents and Settings\Templins\My Documents\My Pictures\EBSfr.JPG
    Graham
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  • gatemplin
    gatemplin Posts: 1,595
    edited June 2004
    Sorry, no camera, maybe my brother has one.
    Graham
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  • Dr. Spec
    Dr. Spec Posts: 3,780
    edited June 2004
    One of the best looking house curves I've ever seen. Great work.
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Service
    SVS
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  • gatemplin
    gatemplin Posts: 1,595
    edited June 2004
    Thanks Doc, I am using 4 filters on the BFD so far. I will probably add one more to smooth out the transition between the sub and mains. I might be able to do it with the phase and crossover though.
    Graham
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  • Dr. Spec
    Dr. Spec Posts: 3,780
    edited June 2004
    I bet it sounds AWESOME.

    Your first attempt (with the external port) lacked sufficient internal volume to provide good efficiency at the tune point, so the sub died at 50 Hz. Add to that **** room acoustics and your first curve looked really sad.

    This curve is nothing short of stellar and I bet the difference in bass quality between then and now is like a universe apart.
    "What we do in life echoes in eternity"

    Ed Mullen (emullen@svsound.com)
    Director - Technology and Customer Service
    SVS
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  • gatemplin
    gatemplin Posts: 1,595
    edited June 2004
    Originally posted by Dr. Spec
    I bet it sounds AWESOME.

    Your first attempt (with the external port) lacked sufficient internal volume to provide good efficiency at the tune point, so the sub died at 50 Hz.

    Apparently cabinet design wasnt as easy as I thought :D I guess those Adire fellas know what they're doing. I am looking forward to building some XBL^2 loudspeakers when they come out soon, brilliant technology.
    Graham
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