Taking the Correct 90° 'Road' to Perfect Sonic Horn Performance

You will see from reviewing our extensive range of Acoustic Cleaners that we offer two models, the PAS - 75 and the PAS - 60 in both straight and curved versions - why?

These are our lowest frequency and therefore largest sonic horns and are typically employed to prevent material build within large structures such as silos or boiler plants. Especially in the latter case such sonic horns are mounted on side walls on existing inspection hatches adjacent to walkways around the boiler plant. Therefore there are occasions when the straight version of either the PAS - 75 or PAS - 60 would either cause an obstruction across such walkways or could not be installed on top of a spray dryer without fouling the building's roof structure. In such cases we offer a curved equivalent version.

You may think (as some of our competitors do) that it is a simple matter to bend one section of the horn to form a 90° bend - however it is not so simple and for Primasonics® it required us to firstly carry out considerable acoustic sound lab experiments followed by careful CAD design and finally ensuring, through our strict ISO Standards & Procedures that the manufacturing process is absolutely first class. As with every single horn we sell, each curved horn is then thoroughly tested within our acoustic testing chambers before releasing into stock.

Why simply bending a horn section to 90° will have a serious detrimental on the units frequency and performance?


The answer is clearly the correctly designed Primasonics® curved sonic horn on the right. Let's look at why proper curves are essential and where semi right hand bends would significantly affect performance. Let's look at the Indie 500 or to give it the full name the Indianapolis 500, an explanation of which follows.

The Indianapolis 500-Mile Race, which is more often than not shortened to Indianapolis 500 or Indy 500, is held annually over the Memorial Day weekend at the Indianapolis Motor Speedway in Indiana. Now an American tradition, the first Indianapolis race was held in 1911.

Not only should 1911 be considered a milestone in that it was the first time the Indie 500 was undertaken, also, it was the first time that a new invention was utilized in the race. Ray Harroun participated in the very first Indie 500 and used his own invention, the rear view mirror, to aid him in the race. His foresight and inventiveness took him to be leader of that race, in just the same way that Primasonics® innovation and product performance has taken us to be leaders in sonic horn technologies. For a clearer understanding of the Indianapolis track and its relationship to the curvature of the Primasonics® horn see below for the map of the world famous track.


From this point on, remember to think about why the Indie 500 track has no sharp corners, rather properly designed rounded bends. Expending energy results in increased force for less performance and the Indie 500 track allows for smooth turns resulting in optimum car performance.

The first thing you will notice when examining the Indie 500 is the curve of the track, the circular curves on this course allow for a smooth transition. It is without question that right angled turns would be detrimental to the cars performance and potential for success. Thus the crowds who flock each year to this world known event can enjoy fast, safe car racing with each car being allowed to operate at peak performance.