| our logic is correct but you refuse to see the whole picture - this is the biggest mistake the admirers of the open baffles do. Let trace the entire process. You grow the size of the baffle in order to keep the speakers to enter the “dipole mode” at the level where acoustic pressure under Fs is dropped. If you are at 1000Hz or 500Hz or even 200Hz then it is doable and it work very nice. However, if you are at 50 Hz or at 30Hz then the size of the wake grows significantly faster and ne you need truly huge baffle. Let forget the LF acoustic shortage due to the reflection while the huge baffle are being used. The very large baffles would require very large rooms, this is understandable. The very large rooms would require more and more acoustic pressure injected into the room in order to reproduce the relatively low frequency. Pressure might be built up only by surface and exertion. The driver’s surface is fixed, so to get more pressure at LF in the very large room we need to exert the drivers further. Unfortunately the drivers in the past were not made to work in heavy exertion mode. The best older woofers are hard-suspended drivers and they did VERY good tonally in limited dymick ranges. Drive then a bit harder and this coils will run out of their very short saturated magnetic gap and their wonderful tone get converted into very severs distortion. Take for instance the best Klangfilm woofers and play them louder then mezzo forte – they dive into very sever distortions. It is not to mention that ALL open baffle driver at the bottom sound absolutely the same… |
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