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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.
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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.
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– 3 –
+
_
180
°
0
°
90
°
270
°
360
°
Reference
Monitor
Subwoofer
The Phase Control can fix up to 270
°
degrees in phase shift
between the outputs of a reference monitor & subwoofer.
