I want to design a band pass filter with lower and higher cuttoff frequency as 2hz and 50hz respectively. which type of filter should i choose and of what order

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PS-1200 Specifications
Design
Single driver, DCBS™ system with high velocity resistive ports and built-in amplifier Amplifier High current, hybrid output, 130 watts RMS
Amplifier Features Powersaver auto-on/off, soft clipping, thermal protection Low Pass Filter Frequency Variable 50Hz-150Hz Low Frequency Driver 310 mm, carbon-fiber-reinforced composite cone, Apical™ former Low Frequency Extension 23 Hz (DIN) Sub / Sat Phase Alignment 0 - 180 Finishes Black Ash Inputs From A/V receiver/processor or Paradigm X-Series Control Unit or preamp left/right output; From receiver/amplifier speaker terminals or main/satellite speaker terminals Weight 68 lbs. (31 kg) Dimensions HxWxD 19.75" × 17" × 21"
(50cm × 43cm × 53cm)
Specifications are subject to change without notice.

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Unfortunately, products are designed to work with specific voltages and frequencies. Some devices have broader ranges of voltages and frequencies because they use electronic power suppies (often called "switching power supplies") as opposed to the costlier, heavier transformer types. Nearly all devices that have motors or have a transformer will be designed to operate on either 50 or 60 hertz - not both. Use of these devices with a frequency other than what it is designed for will run too fast / too slow and will overheat to the point that it may become a fire hazard. Unlike voltages that can be easily stepped up or down with a transformer, there is no easy, inexpensive way to change frequency.

You should replace your "60Hz only" equipment with 50Hz or 50/60Hz equipment, or if a short term relocation, rent the correct 50Hz equipment instead.

I hope this helps & good luck!

Hi Ethan,

What you're looking for is called a "crossover". A crossover is an electronic filter for an audio or speaker circuit. In an audio circuit, a crossover is used to prevent or pass certain frequencies or a range of frequencies from passing through it. Since your sub will reproduce the bass or low frequencies, you don't want other speakers to reproduce them. A band pass filter on your door speakers will do this for you. A band pass filter passes only a range or "band" of frequencies and blocks those that are above and below the range or band of frequencies selected. Installing a band pass filter will prevent the very high & very low frequencies from getting to the door /dash speakers. Likewise, you should consider connecting a low pass filter to your subs, too. The low pass filters work a little differently from of the way band pass filters work - they only allow low frequencies to get to the sub - blocking all the other higher frequencies (your other speakers are better suited to reproduce those). Lastly, you would install a high pass filters on tweeters. Tweeters are designed to reproduce only the high frequencies - sending mid and low frequencies to them is wasting power and can cause damage to them.

You purchase the filters for specific crossover points (the block / unblocked point) as determined by the individual speakers. If a sub has a frequency response of 20Hz - 100Hz, a low pass filter of 100Hz would be ideal. Remaining filters would need to begin at 100Hz - assuming the mid-range speakers have a frequency response beginning at 100Hz. A band pass filter of 100Hz - 3KHz would fit the bill nicely if the mid-range speakers go up to 3Khz Match the high end of the band pass to the high end of the frequency response of the mid-range speakers. Next, a high pass filter at 3KHz would allow only the high frequencies to your tweeters. Basically, you want to have the entire audible range 20Hz - 20KHz covered by the speakers and have the crossover points that match the frequency response ranges of the speakers.

I hope this helps & good luck!

A "band pass" filter attenuates all frequencies except those in its specified range. A "low pass" filter attenuates frequencies above a specified frequency (permitting only lower frequencies to "pass"). A "high pass" filter attenuates frequencies below a specified frequency (permitting only higher frequencies to "pass").

For example, a "band pass" filter rated for 500MHz-4GHz will effectively eliminate all frequencies below 500MHz and all frequencies above 4GHz. A "low pass" filter rated at 10KHz will effectively eliminate all frequencies that are above 10KHz. A "high pass" filter rated at 70Hz will effectively eliminate all frequencies that are below 70Hz.

The specs are as follows:

RMS Power Rating:
200 watts x 2 chan. @ 4 ohms
400 watts x 2 chan. @ 2 ohms
800 watts x 2 chan. @ 1 ohm
• Bridged:
400 watts x 1 chan. @ 4 ohms
800 watts x 1 chan. @ 2 ohms
1600 watts x 1 chan. @ 1 ohm
High-Current, Non-Regulated Power Supply
Preamp Outputs
Cobalt Blue LED Illuminated Heat Sink Design (on/off switch for your preference)
Thermal Regulated, Air Induction Dual Cooling Fans
Double Sided PCB (Circuit Board)
High Gloss Chrome Plated Finish
Unique, Clean Chrome Fire/Flame Design
Blue Illuminated VU Meters Indicating Output Response
Clear Power and Speaker Connectors
Variable Bass Boost: 0-18dB @ 40-100Hz
Variable Low-Pass Crossover: 40-120Hz
Variable High-Pass Crossover: 50-750Hz
Variable Subsonic Filter: 20-50Hz
Signal-to-Noise Ratio: 100dB
Frequency Response: 10Hz-40kHz
THD: 0.05%
Channel Separation: 50dB

I don't believe this hookup is amplified; but, if you have used the regular unfiltered speaker connections from your receiver/amplifier to hookup the subwoofer, the system will pass the signal thru the outputs subject to the crossover adjustment on the back panel. You cannot get the full signal if your system is sending only the bass signal to the subwoofer. I have copied the instructions below from the manual. You would set the high freq crossover to the low end of your satellite's frequency range. The full manual is here: http://www.jbl.com/EN-US/Products/Pages/ProductSupportDetails.aspx?PID=PSW-D110

High-Pass Control
• If you hooked up your subwoofer
as shown in Hookup
3 on page 4, you also have
the capability of adjusting
the high-pass frequency.
The High-Pass control
determines the frequency at
which the main speakers
will start reproducing
sounds. If your main speakers
can comfortably reproduce
some low-frequency
sounds, also set this control
to a lower frequency
setting, between 50Hz –
100Hz. This will concentrate
the subwoofer’s
efforts to the ultradeep
bass sounds, while your
main speakers continue to
reproduce the mid-bass
information. If you are
using smaller bookshelf
speakers that do not extend
to the lower bass frequencies,
set the high-pass crossover
control to a higher setting,
between 125Hz – 180Hz.
With this setting, your main
speakers will not have the
burden of reproducing any
low-frequency sounds.
• If you hooked up your subwoofer
as shown in Hookup
1 on page 3, the high-pass
frequency is fixed at 180Hz.
• If you hooked up your subwoofer
as shown in Hookup
2 on page 4, there is no
high-pass control. Unless
your receiver/amplifier
incorporates a high-pass
crossover, your main speakers
will continue to get a
full-range signal.
Final adjustment and blending
of the low-pass and high-pass
controls may evolve over several
listening sessions. A good
starting point would be to set
both the low- and high-pass
controls to the same frequency
and adjust from that point.

Low-pass crossover
Both sets of inputs sum the left and right channels together and the
resulting signal is passed through an adjustable low-pass crossover before
being amplified. The crossover control allows you to adjust the upper limit
of the subwoofer's frequency response from 40 to 120 Hz. The subwoofer's
response will begin rolling off above the frequency you set this control to.
You should set the crossover frequency to obtain a smooth and seamless
transition from the subwoofer to the main speakers in your system. If your
main speakers are smaller units with limited low frequency output, you
may wish to choose a higher frequency (such as 100-120Hz) than you
would with larger speakers which have greater low frequency output. With
larger speakers, you might start with this control set lower, such as 80Hz.

50Hz and 60Hz is frequency of AC power supply. If you are in usa, select 60Hz and if in uk, select 50Hz to avoid flickers of florescent tube lights in picture.

Should've asked more.. LOL.

Depends on a couple things.. I'll try to guide you as much as possible and if you have any question just let me know.

If you are running these subs on a ported enclosure or band pass, do you know the tuning frequency of the box? If it is sealed, I would assume it is 35 Hz + -5.

Also, can you select the frequency for the subs from the Head unit? If so, bring your HU's xover at 50-6- Hz. On the amp itself, turn the gain at 3/4 and you could either get the amp's xover at 50hz or below (that'll depend on your taste). the wiring of the woofer should be in parallel so that you can drop the impedance to 2 Ohms.

The band reject filter is for letting through "other" frequencies than the ones you have specified... which I see it as a good idea so leave it to off,
The band reject frequency, leave it at 40 Hz
Your woofer does great at low frequencies, so the bass boost frequency set it for 60-70 Hz.
Also, since you'll be using this for subs, make sure you have yout dial to LP (Low Pass/Through/Hi Pass)
The high pass dials you don't have to mess with as they aren't used on Low pass.

Something to note. If your stereo has Low Pass frequency adjustment, the amp will already be receiving only low frequencies, so, if you want to leave it in Through (or full) it will not matter, thus I had to admit that this Amp gives you room for seting the audio exactly as you want.

This will be the setting I would use according to my experience and my ear... but, it will depend on your taste as you'll be the one riding it.

if you have any question please let me know.

by the way, hopefully this was useful to you