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  1. Ricci

    The PaleHorn

    Figured I might as well post a little bit about this sub. I've had the design basically finalized for a year and a half or so, if not longer, but I have not had a chance to get the amplifiers done, the drivers in, the cabs built, testing etc...Things are on the move now though. The goals for this design are similar to the Othorn. The bandwidth of interest is 25-90Hz primarily. The application would be for music or live sound in very large spaces or outdoors,with huge headroom from a cab that is reasonably handled by one guy with some wheels, or man handled by 2 men. Had to be small enough to fit one in a small SUV or a pair in a larger SUV or van. It isn't a typical professional bass bin because of the extra extension. I've found that with subs that do not really get down below 35Hz with power, which is most "pro" subs honestly. I start to miss some of the lowest bass fundamentals in music, which in the last 10 years, has really started to dip into the 25-35Hz range more often. The tradeoff for 25Hz extension is reduced sensitivity and output in the middle and upper part of the bass bandwidth, but by using an extremely powerful and expensive driver, this can be overcome a bit. The goal is not to blow away other high power pro subs on the market with sheer loudness, but to offer comparable headroom in the 40-100hz bass range as a more typical bass system of similar external cab volume, while extending 1/3 to 2/3 octave lower with real power. I also expect low distortion, good sensitivity, and controlled LF decay to go with lofty dynamic headroom. Basically the idea behind this design is to take the performance of the Othorn, which I was very happy with the result of and push the ball a bit further, while also fixing a few minor things I felt I could have done a bit better in the Othorn in retrospect. To that end the cabinet form factor will still be the same 36x36x24" and it will still employ a single 21" driver. However the driver will now be the B&C 21 IPAL instead of the 21sw152. Due to the beefed up nature of the IPAL driver, which offers: Roughly 40% excursion, even better efficiency, a heavier voice coil with higher power handling and a reinforced cone; the result should be a system of comparable sensitivity, slightly better maximum output 40-100Hz, slightly better long term thermal behavior at high power and just a hair more extension with notably more output at 20-30Hz. The Othorn tune is right about 28Hz while the Palehorn will come in slightly lower at about 26.5Hz. Also the cabinet design is entirely different. There isn't a single piece that is shared between the two. Everything internally is different. The cabinet for the Palehorn should be significantly stiffer especially around the driver and should be more immune to cabinet vibration. Additionally the system will be powered with PS IPAL amplifier modules which offer extremely advanced DSP processing and real time monitoring of behavior of the driver and amplifier as well as active feedback of the system both electrically and acoustically with real time correction of the driver behavior. The feedback system has shown to provide some improvements in distortion, ringing, overshoot and overall tracking of the input signal. I am very excited to see some results on a higher order system. How PS has managed to apply tracking and correction to resonant or 1/4 wave systems is very interesting since previously the consensus has been that it could only be applied effectively to sealed or infinite baffle systems. There are a number of questions that have yet to be answered such as how the system will behave with a complex driver loading, how it will behave with ULF frequencies below 16Hz, whether the 21IPAL driver will survive the forces and pressures that will be on the cone in this cabinet, as things are really being pushed very far out in left field (BAD things are a very real possibility with the internal forces involved), how bad of an effect air compression will be on the system at near maximum outputs, etc...LOTS of questions to still be answered. Note I will NOT be sharing DIY plans for this system at this time. I may not even show the cab internals. It is possible that I may at some point after I've gotten all of the testing done on a finished pair and know for sure what the good, the bad and the ugly of it are, but that will be some time off. I will show all of the measurements and other data I collect on them though.
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