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What woofer about 93/95 Spl?

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  • What woofer about 93/95 Spl?

    This is to match a FE206E Fostex full range speaker's Spl.
    Bass reflex box already build, 45 liters for the Fostex, that sounds alone.
    Box has a false bottom, now filled with sand, about 16 liters, that I would use for the woofer I'm asking you about to suggest.

    I also own an external FT17H Fostex Horn tweeter (98,5 Spl, now not connected), with a custom external filter to match the full range speaker.
    All materials are old enough, but still good.

    I'd like to experiment bass reinforcement and a cut of middle frequencies giving them to the tweeter (FE206E lacks of bass and has an irritating peak in the middle): think to buy a 3 ways crossover (I'm uncapable about electronics DIY) and split frequencies, eventually adding some Spl control to lower tweeter's Spl when the ideal woofer will lack of it.

    So. The box can host a woofer up to 17" in 16 liters space, budget is up to 100 dollars each woofer. Do you have any advice about which woofer to select?

    Thanks!

  • #2
    Re: What woofer about 93/95 Spl?

    Do you have a preference for an open-baffle or horn-loaded design? How large is the room, and do you want to maximize output or accuracy?
    Best Regards,

    Rory Buszka

    Taterworks Audio

    "The work of the individual still remains the spark which moves mankind ahead, even more than teamwork." - Igor I. Sikorsky

    If it works, but you don't know why it works, then you haven't done any engineering.

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    • #3
      Re: What woofer about 93/95 Spl?

      Originally posted by Taterworks View Post
      Do you have a preference for an open-baffle or horn-loaded design? How large is the room, and do you want to maximize output or accuracy?
      Not too many home audio drivers at that output level (possibly none). Most likely you'll have to go pro sound, and then (especially limited by that small of a volume) the bass extension won't be great (but likely better than what your FR's are capable of).

      Chris

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      • #4
        Re: What woofer about 93/95 Spl?

        Unfortunately PE doesn't carry them, but I was thinking of one of the high efficiency Lambdas.
        http://www.aespeakers.com/drivers.php?driver_id=20

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        • #5
          Re: What woofer about 93/95 Spl?

          Originally posted by Tony G View Post
          Unfortunately PE doesn't carry them, but I was thinking of one of the high efficiency Lambdas.
          http://www.aespeakers.com/drivers.php?driver_id=20
          Like most high sensitivity drivers, including Fostex, these get high sensitivity via low Qes/Qts, and that results in lean bass response. The more viable solution in most cases is using medium Qes/Qts drivers of lower sensitivity, just more of them.
          www.billfitzmaurice.com
          www.billfitzmaurice.info/forum

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          • #6
            Re: What woofer about 93/95 Spl?

            45 litres with 93db/w can only be achieved by Pro drivers. The Eminence Alpha-A 8" will get you down to about 45hz or so @ 93db/w in that cabinet. http://www.parts-express.com/pe/show...number=290-401

            Once you consider baffle step you may have to go with something like a http://www.parts-express.com/pe/show...number=264-424 and give up some low frequency extension for more efficiency.

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            • #7
              Re: What woofer about 93/95 Spl?

              Originally posted by Servicetech View Post
              Once you consider baffle step you may have to go with something like a http://www.parts-express.com/pe/show...number=264-424 and give up some low frequency extension for more efficiency.
              *Fs: 107 Hz *Xmax: 2.0 mm
              That's an oversized midrange, not a woofer.
              "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

              http://www.diy-ny.com/

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              • #8
                Re: What woofer about 93/95 Spl?

                Model it in your box software as ported, it can get down into the 50's. All speakers must obey Hoffman's iron law, and in order to get high efficiency out of a relatively small box, bass extension has to give. Xmax at 2mm may be an issue, mechanical power handling won't be very good at lower frequencies.

                I'm using the Eminence Alpha8 in my center channel with good results, bass output is strong for an 8" driver, but it need a relatively large ported cabinet to do it. In my 1.2cu ft cabinet I can get down to about 50hz which is plenty for a center channel. Xmax is better at 3.2mm and makes the drivers mechanical power is only 50W when used as a midbass. 50W on a driver that gets 93db/w is loud enough for most uses, same output as a 87db/w driver with 200W.

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                • #9
                  Re: What woofer about 93/95 Spl?

                  Originally posted by superba View Post
                  So. The Box Can Host A Woofer Up To 17" In 16 Liters Space, Budget Is Up To 100 Dollars Each Woofer. Do You Have Any Advice About Which Woofer To Select?
                  As others have mentioned, some of the Pro Sound drivers have 93-95 dB efficiency that you want, but the trade off is that the resonance frequency (Fs) may be too high, and/or the Qts will be so low that the bass will be effectively weak.

                  Most of the woofers that operate in the range to work with your Fostex will likely need more than a 16 liter space for closed or vented. Otherwise, the Fc (closed) or Fb (vented) will be higher than what you want.

                  As an example, the Eminence Beta-10A has around 95 dB below 500 Hz.
                  https://www.madisound.com/store/manuals/beta-10a.pdf

                  But it has Fs = 53 Hz. When it is installed in a 16 Liter sealed box, Fc = 115 Hz, and Qtc = 1.07. Probably not what you're looking for. This driver could be used in a vented box, but it needs to be much larger. One vented box example would be 37.5 liters, Fb = 50 Hz, with vent 3 inch (dia) x 5 inch (length). Again, probably not what you're looking for.

                  On the other hand, you might consider a bandpass enclosure. See Brian Steele's site here for some calculations:
                  http://www.diysubwoofers.org/bnd/4thorder.htm

                  Depending on the frequency band you are interested in, a less efficient (and less expensive!) driver could provide the output you want to mate up with your Fostex.

                  Hope this helps.
                  - Dave R
                  the 200% Norske

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