4
4
Examples and configurations for various multiples of subwoofers:
Adjustment of low cut off frequency
The cut off frequency of a subwoofer is normally in the region of 60 to 100Hz. This is always
dependent on the particular installation and listening position. A frequency of 80Hz is a good
compromise for effective bass compared to listening quality.
Installing the subwoofer into an enclosure
The new Polyglass subwoofers have been designed to work in sealed box enclosures. This
system of charge, (easy and convenient for most installations), allows the user to experience a
more dynamic extreme bass (12 dB/oct), with the added bonus of easier integration into the
rest of the system.
See pages 6, 7 and 8 regarding our proposals for the various volumes available per subwoofer.
Building an enclosure
The construction should always remain strong and rigid, to eliminate any unwanted resonances.
A good material such as MDF (Medium Density Fibreboard) will effectively ensure this is
possible. Choosing the correct thickness of MDF compared to the surface area decided, is
also critical to ensure the enclosure does not vibrate. For this reason the general thickness
recommended is 19mm MDF. Any loose components such as the internal connections and
cables should always be fixed securely inside. Damping material (foam etc) covering all the
internal walls of the enclosure, will further ensure it is free from unwanted resonances. It is
imperative that your custom designed subwoofer enclosure remains securely mounted at all
times to the vehicle.
2 subwoofers 33 V2 both in parallel. Z = 1
Ω
2 subwoofers connected in series / parallel. Z = 4
Ω
3 subwoofers 33 V2 connected in series / parallel. Z = 2,66
Ω
POLYGLASS SUBWOOFERS MANUAL
U s e r
M a n u a l
notice sub polyglass 2.indd 4
notice sub polyglass 2.indd 4
16/04/07 15:25:58
16/04/07 15:25:58
