Filtering is very important in a system, a complex filtering is not necessarily synonymous with quality. It is possible to combine active filter and passive filter in one system.
There are two types of passive filters:
- High Pass: the frequencies are removed below. For example a high pass at 2000 Hz passes frequencies above 2000 Hz,
- lowpass: frequencies above is removed from. For example a low pass at 2000 Hz passes frequencies below 2000 Hz
The 2-way crossover is comprised of a qualified filter module for "high pass" (high-pass filter) and a qualified filter module of "going down" (low pass filter). The cutoff frequencies of the two filters modules are generally identical.
3-way passive filters (and more) are composed of multiple filter modules "high pass" and "low-pass", the medium channel (center) composed of a high-pass and low-pass is called " bandpass "(band-pass filter). The filter module "band-pass" is nothing more than the combination of a filter "High Pass" filter and a "low pass".Moreover, the operational amplifiers generate noise. Historically, the first discrete filters ROE (+ RC circuit operational amplifier) appeared in the mid sixties. It should nevertheless expect the seventies, with the first commercial integrated circuit (HIC and DIP) to be revealed the economic interest of this type of filter.
DAS
|
F-VT215
Passive crossover for DAS VANTEC-215
30006228
30006228
|
Beyma
Unavailable |
FD250
Passive crossover Beyma FD250, 2 ways, 2000 Hz
2 way. Cut off frequency 2.0 kHz, power handling 600 WRMS, attenuation slope 12 dB/octave, equalization -3dB @ 3.5 kHz, HF attenuation 0 -3 -6 or -7.5 dB. Dimensions 135 x 175 mm (4 holes 4 mm each on 165 mm and 125 mm space).
1FFD250
1FFD250
|
DAS
|
Passive crossover for DAS ALTEA-412
|
DAS
|
F-AR326
Passive crossover for DAS ARTEC-326
30006898
30006898
|
Eminence
Unavailable |
PXB3:5k0
Crossover Eminence PXB3:5K0, 3 ways, 500 / 5000 Hz
U-PXB35K0
U-PXB35K0
|
DAS
|
F-ARCO12SUB
Passive crossover for DAS ARCO-12SUB
30008340
30008340
|
DAS
|
F-BIDRIVER
Passive crossover for DAS BIDRIVER-PLUS and BIDRIVER-PLUS-T
31000226
31000226
|
DAS
|
F-HQ112.43
Passive crossover for DAS HQ-112.43
30006506
30006506
|