FE126En Factory Reflex, a "cruel joke"
Posted 8th February 2013 at 09:14 PM by planet10
The subject of this box has come up before, after a 3rd reply to queries, this blog post,
One of 2 Fostex factory recommended cabinets. 10.5 litre tuned to 61 Hz. The other is not very good either.
From the sims you can see that with this box any bass response you have will be way down which will exaggerate the FE126's forward midrange and the 7k peak.
The top curve is half-space (ie what you would get if you mounted them flush in a wall or approximately what you would get with BSC added). The lower curve is with no filters and a simulated 6 dB of baffle loss. You would need a 2-stage filter to give any semblance of flat response. You would lose some 12 dB of sensitivity and then you run into the very low xMax which means that for anything but nearfield use you are likely exceeding it, and even there you probably won't be able to really push them. Further, in our experience, this kind of filter reduces the speakers DDR (downward dynamic range) and wipes out some of those things that makes the FE126 special.
All of these things work together to make this enclosure what another member described as a cruel joke.
Not all is lost thou. The FF125wk will drop right in and give much more satisfactory results (top curve). The box is still a bit big, and perhaps could be tuned a bit higher, but they could be done after the fact. Just add up to 2 litres of solid fill. Make it irregular, stick it to the backs, sides, level with the driver to break up standing waves, and on the bottom/top.
dave
One of 2 Fostex factory recommended cabinets. 10.5 litre tuned to 61 Hz. The other is not very good either.
From the sims you can see that with this box any bass response you have will be way down which will exaggerate the FE126's forward midrange and the 7k peak.
The top curve is half-space (ie what you would get if you mounted them flush in a wall or approximately what you would get with BSC added). The lower curve is with no filters and a simulated 6 dB of baffle loss. You would need a 2-stage filter to give any semblance of flat response. You would lose some 12 dB of sensitivity and then you run into the very low xMax which means that for anything but nearfield use you are likely exceeding it, and even there you probably won't be able to really push them. Further, in our experience, this kind of filter reduces the speakers DDR (downward dynamic range) and wipes out some of those things that makes the FE126 special.
All of these things work together to make this enclosure what another member described as a cruel joke.
Not all is lost thou. The FF125wk will drop right in and give much more satisfactory results (top curve). The box is still a bit big, and perhaps could be tuned a bit higher, but they could be done after the fact. Just add up to 2 litres of solid fill. Make it irregular, stick it to the backs, sides, level with the driver to break up standing waves, and on the bottom/top.
dave
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