Subsonic Filter
®
The TRM series uses a Subsonic Filter to prevent the woofer from reproducing inaudible frequencies. Subsonic frequencies (known as infrasonic frequencies) are signals below the normal human hearing range and are generally considered to be below 20Hz. The subsonic filter reduces the energy of these frequencies and restrains the woofer from operating outside its optimum linear excursion. This type of electronic control eliminates the mechanical distortion caused by a woofer traveling beyond its XMAX, improves power handling, increases reliability and improves sonic performance.
THE RESULT: Improved power handling, increased reliability and improved sonic performance.
Phase Control
®
The Phase Control is used to align the arrival time of the subwoofer's low frequency information with high frequency information pro- duced by additional reference monitors. Aligning both signals will insure that both low and high frequencies arrive at the listening position at the same time. This eliminates the possibility of acousti- cal cancellation and improves the reproduction of transients.
THE RESULT: Eliminates phase cancellation and improves transient response.
Reference Subwoofer
Monitor
+
_
0° 90° 180° 270° 360°
The Phase Control can fix up to 270° degrees in phase shift between the outputs of a reference monitor & subwoofer.
Woofer
Santoprene Rubber Surround
®
Santoprene is a very durable and temperature tolerant material which provides a consistent support necessary for the linear motion of the speaker cone. In addition, the damping capabilities eliminate the transmission of sonic disturbances between the cone and the frame of the speaker. This greatly improves the accuracy of the woofer's low frequency response.
THE RESULT: Improves woofer's low frequency response.
Aluminum Voice Coil Former
®
The transducer's voice coil former is black anodized aluminum for highly efficient thermal transfer. Another method of producing voice coils is with Kapton® formers. Although this material is very resistant to heat, any heat generated by the transducer is "trapped" on the copper voice coil windings. HAFLER uses aluminum voice coil formers because aluminum acts like a "heat sink" and helps dissipate heat away from the voice coil. This allows winding high temperature copper wire in multiple layers for improved efficiency.
THE RESULT: Improves power handling by efficiently dissipating heat.
– 3 –
