The order of 4 or sealed rear chamber bandpass system is essentially a system of watertight enclosures with the addition of an acoustic filter for the driver. The resulting system usually provides a lower cut-off frequency, the compromise that a larger case. The space can be reduced by two drivers in isobaric configuration.
4th-order bandpass systems generally show better able to handle the functions that the other major systems are considered. The transient response and is second only to the sealed enclosure systems, making it a good choice for subwoofer applications.
Since all output 4th order bandpass system is via the port, the largest diameter possible for the port area should be used to minimize noise from the port. The ports must be incinerated where possible, for the same reasons.
4th order Ssobaric Subwoofer Box Design
The 4th order bandpass system rarely allows a perfect bandpass response - there is usually an out-of-band noise present in the production. A notch filter can be used simply to reduce the noise as audible. Otherwise, a lowpass filter used in series with the driver, but the in-band response system may be affected if this approach is taken.
As the speaker sound 4th order band pass issued by the openings or ports on the port side of the box, the port noise inevitable.
This unwanted noise can be minimized by a notch filter and the largest diameter possible for the port of the area should definitely be used. Another option is to burn the ports of the 4th order bandpass room as this will certainly help to reduce unwanted extra from the subwoofer.
Mini SubWoofer Power Amplifier clik for detail
WOOFER / MID MODEL - 5MP60 / N
Specifications
Nominal Basket Diameter 5 "/ 125mm
Impedance 8 ohm
RMS Power 50 Watts
Program Power 100 Watts
Frequency response 50Hz - 12.0kHz
Sensitivity (1W/1m) 91dB
Voice Coil Diameter 1 "/ 25.8mm
BL Factor 6.4 N / A
Voice Coil Length 14 mm
Air Gap Height 6mm
X Damage (peak to peak) 20 mm
Magnetic Assembly Weight 2.2 lbs / 1.0 kg.
Edit Information
Diameter 5.28 "/ 134mm x 5.28" / 134mm
Bolt Circle Diameter 5.4 "/ 137mm
Baffle Cutout Diameter --
- Front Mount 4.72 "/ 120mm
Many of the 4 mounting holes
Volume displaced by driver, 019 m 3 / .5 liter
Total Depth 2.68 "/ 68mm
Net weight 2.64 lbs / 1.2 kg.
Weight 2.8 lbs / 1.27 kg.
Materials
Basketball aluminum diecast
Polypropylene cone
Rubber Surround
Voice Coil Wire Copper
Ferrite
Thiele-Small Parameters
Resonance Frequency (FS) 60 Hz
Impedance (Re) 5.33 ohms
Coil Inductance (Le) 0.4 mH
Mechanical Q (Qms) 1.604
Electrical Factor (Qes) .35
Total Q (Qts) .29
Comp. Equivalent Vol. (Vas) 35 FT3 / 9.8 Liter
Voice Coil Overhang (Xmax) 4.0mm
Reference yield 5%
Volume Displacement 34 cm3
