How to Select the Crossover Point to Use on a Subwoofer In Car Audio System

Pick a Passive Crossover Point

1. 1
   Choose a passive crossover if you're looking for a cheap, simple solution to your sound troubles. A passive crossover is a coil or capacitor that attaches right onto your speaker lead or subwoofer, filtering audio at prespecified ranges (which are specified on the packaging when you buy one).
2. 2
   Keep in mind that your subwoofer is used to re-create the bass frequencies in music. Thus, to select a crossover point that's going to make a tangible difference in your sound quality, you'll have to choose one that's in the middle range of the low-frequency end of the spectrum. Bass is usually defined as 300 Hertz or lower, so a passive crossover should be in the 200-hertz range to be effective.
3. 3
   Add a crossover point to your speakers rather than your subwoofer, if you'd rather simply filter out high frequencies from low frequencies and send each to a dedicated speaker. Due to the relatively limited range of bass frequencies, altering your speakers instead of your subwoofer can be a useful alternative.



Choose Active Crossover Points

4. 1
   Make use of a three-way network of active crossover points to maximize your car's audio system capabilities. Active points actually process the signal before it's sent along to your amplifier, and using low-pass, mid-pass and high-pass filters can help you customize your music-listening experience. Ideal levels are primarily identified through trial and error.
5. 2
   Use 100 hertz as a ballpark figure if you want your low-pass filter to create a deep, echoing boom. This is the preference of many rap and hip-hop fans. You can go as low as 80 hertz if you want to tighten the sound but keep its "boom." However, the lower your low-pass filter goes, the more difficult it becomes to distinguish subtleties in the sound.
6. 3
   Select a high-pass crossover point in the range of 3,000 hertz. This will ensure that low- and mid-range sounds are being separated from the highest-pitched sounds, allowing you to dedicate a speaker to playing back only the highest frequencies. The high-pass crossover point is more applicable to your amplifier and speakers than your subwoofer, because subwoofers are dedicated to low-frequency bass tones.
7. 4
   Use what's known as a band-pass active crossover point to moderate the frequencies that are higher than the low-pass threshold, but lower than the high-pass threshold. This will ensure their even distribution across all the speakers in your system. If your low-pass filter is set to 100 hertz and your high-pass filter is set to 3,000 hertz, your band-pass filter will be a "100-3,000."
8. 
   
   
   5
   Try a variety of different low-pass, high-pass and band-pass crossover points while you are playing the kind of music you expect you'll be listening to most often. Trial and error is the best way to optimize your listening experience, since everyone has their own individual preferences.

Read more: http://ilhamnurulresources.blogspot.com/#ixzz1EnjuFCmN

Guy Sebastian,Klang born singer, arrested at gunpoint in LA

Australian pop idol Guy Sebastian was arrested in Los Angeles earlier this week.

The Klang-born singer, who is currently residing in LA while trying to launch his US music career, was reportedly surrounded by officers at gunpoint and taken in handcuffs to the police station on suspicion of grand theft auto.

According to The Daily Telegraph, Sebastian had reported his car missing two weeks ago but soon realised that it had simply been towed away and later got it back.

A source revealed: "He was saying to the [police], 'Look, this is my car and I have recently reported it stolen'. [However] they still took him to the cop shop."

But he was released, of course, after he proved that it was his car.

Siapakah Dajjal?

Dajjal adalah seorang manusia dari keturunan Yahudi. Dia bukan Jin atau apajua makhluk lain selain ia sebagai manusia yg ditangguhkan ajalnya “Minal Munzharin” seperti halnya Nabi Isa as yg di angkat oleh Allah swt ke atas langit dan ditangguhkan kematiannya sehingga beliau nantinya turun semula ke atas muka bumi ini lalu beliau akan mati dan di kuburkan di Madinah Al Munawwarah. Sama juga halnya dgn Iblis yg di tangguhkan kematiannya sehingga kiamat nanti.
Dajjal; ayahnya seorang yg tinggi dan gemuk. Hidungnya seperti Paruh burung. Sedangkan Ibunya pula seorang perempuan gemuk dan banyak dagingnya. MenurutImam Al Barzanji ada pendapat mengatakan bahawa asal keturunan bapanya ialah seorang Dukun Yahudi yg di kenali dgn “syaqq” manakala ibunya adalah dari bangsa Jin. Ia hidup di zaman Nabi Sulaiman as dan mempunyai hubungan dengan makhluk halus. Lalu oleh Nabi Sulaiman ia akhirnya ditangkap dan dimasukkan ke dalam penjara. Walau bagaimanapun kelahiran dan kehidupan masa keciltidak diketahui dgn jelas.

Sifat Badannya:

Hadis Huzaifah r.a katanya: Rasulullah s.a.w. telah bersabda: Dajjal ialah orang yang buta matanya sebelah kiri, lebat (panjang) rambutnya serta dia mempunyai Syurga dan Neraka. Nerakanya itu merupakan Syurga dan Syurganya pula ialah Neraka (Hadis Sahih Muslim)
Ada beberapa ciri perawakan Dajjal yg disebutkan dalam Hadis Rasulullahsaw, diantaranya:
Seorang yg kelihatannya masih muda; Berbadan Besar dan agak kemerah-merahan; Rambutnya kerinting dan tebal. Kelihatan dari belakang seolah-olah dahan kayu yg rimbun.

Dan tandanya yg paling ketara sekali ada dua:Pertama: Buta mata kirinya dan kelihatan seperti buah kismis yg kecut, manakala mata kanannya tertonjol keluar kehijau-hijauan berkelip-kelip laksana bintang. Jadi kedua-dua matanya adalah cacat.Kedua: Tertulis didahinya tulisan “Kafir (Kaf-Fa-Ra)”. Tulisan ini dapat dibaca oleh setiap org Islam, sama ada ia pandai membaca atau tidak. Mengikut hadis riwayat At-Thabrani, kedua-dua tanda ini menjelma dalam diri Dajjal setelah ia mengaku sebagai Tuhan. Adapun sebelum itu, kedua-dua tandayg terakhir ini belum ada pada dirinya.

Tempat Tinggalnya Sekarang:

Menurut riwayat yg sahih yg disebutkan dlm kitab “Shahih Muslim”, bahawa Dajjal itu sudah wujud sejak beberapa lama. Ia dirantai di sebuah pulau dan ditunggu oleh seekor binatang yg bernama “Al-Jassasah”. Terdapat hadis mengenainya.. (tetapi terlalu panjang utk ditulis.. anda boleh membaca terus dari buku). Daripada Hadis ini jelaslah bagi kita bahawa Dajjal itu telah ada dan ia menunggu masa yg diizinkan oleh Allah swt utk keluar menjelajah permukaan bumi ini dan tempat “transitnya” itu ialah disebelah Timur bukan di Barat.

Berapa lama ia akan hidup setelah kemunculannya:

Dajjal akan hidup setelah ia memulakan cabarannya kepada umat ini, selama empat puluh hari sahaja. Namun begitu, hari pertamanya adalah sama dgn setahun dan hari kedua sama dengan sebulan dan ketiga sama dengan satuminggu dan hari-hari baki lagi sama seperti hari-hari biasa. Jadi keseluruhan masa Dajjal membuat fitnah dan kerosakan itu ialah 14 bulan dan 14 hari. Dalam Hadis riwayat Muslim ada disebutkan:
Kami bertanya: “Wahai Rasulullah! Berapa lamakah ia akan tinggal di muka bumi ini? Nabi saw, menjawab: Ia akan tinggal selama empat puluh hari. Hari yg pertama seperti setahun dan hari berikutnya seperti sebulan dan hari ketiga seperti seminggu. Kemudian hari yg masih tinggal lagi (yaitu 37 hari) adalah sama seperti hari kamu yg biasa. Lalu kami bertanya lagi: Wahai Rasulullah saw! Di hari yg panjang seperti setahun itu, apakah cukup bagi kami hanya sembahyang sehari sahaja (iaitu 5 waktu sahaja). Nabi saw menjawab: Tidak cukup. Kamu mesti mengira hari itu dgn menentukan kadar yg bersesuaian bagi setiap sembahyang..”
Maksud Sabdaan Rasulullah saw, ini ialah supaya kita mengira jam yg berlalu pada hari itu. Bukan mengikut perjalanan matahari seperti biasanya kitalakukan. Misalnya sudah berlalu tujuh jam selepas sembahyang Subuh pada hariitu maka masuklah waktu sembahyang Zohor, maka hendaklah kita sembahyangZohor, dan apabila ia telah berlalu selepas sembahyang Zohor itu tiga jam setengah misalnya, maka masuklah waktu Asar, maka wajib kita sembahyang Asar Begitulah seterusnya waktu Sembahyang Maghrib, Isyak dan Subuh seterusnya hingga habis hari yg panjang itu sama panjangnya dgn masa satu tahun dan bilangan sembahyang pun pada sehari itu sebanyak bilangan sembahyang setahun yg kita lakukan. Begitu juga pada hari Kedua dan ketiga.

Fitnah Dajjal:

Dajjal telah diberi peluang oleh Allah swt utk menguji umat ini. Oleh kerana itu, Allah memberikan kepadanya beberapa kemampuan yg luar biasa. Di antara kemampuan Dajjal ialah:

* Segala kesenangan hidup akan ada bersama dengannya.

Benda-benda beku akan mematuhinya.Sebelum kedatangan Dajjal, dunia Islam akan diuji dahulu oleh Allah dgnkemarau panjang selama 3 tahun berturut-turut. Pada tahun pertama hujan akan kurang sepertiga dari biasa dan pada tahun kedua akan kurang 2/3 dari biasadan tahun ketiga hujan tidak akan turun langsung. Umat akan dilandakebuluran dan kekeringan. Di saat itu Dajjal akan muncul membawa ujian. Maka daerah mana yg percaya Dajjal itu Tuhan, ia akan berkata pada awan: Hujanlah kamu di daerah ini! Lalu hujan pun turunlah dan bumi menjadi subur. Begituj uga ekonomi, perdagangan akan menjadi makmur dan stabil pada org yg bersekutu dgn Dajjal. Manakala penduduk yg tidak mahu bersukutu dgn Dajjal..mereka akan tetap berada dlm kebuluran dan kesusahan.

Dan ada diriwayatkan penyokong Dajjal akan memiliki segunung roti (makanan) sedangkan org yg tidak percaya dengannya berada dalam kelaparan dan kebuluran.
Dalam hal ini, para sahabat Rasullullah s.a.w. bertanya:”Jadi apa yg dimakan oleh org Islam yg beriman pada hari itu wahai Rasulullah?”Nabi menjawab:”Mereka akan merasa kenyang dengan bertahlil, bertakbir, bertasbih dan bertaubat. Jadi zikir-zikir itu yang akan menggantikan makanan.” H.R Ibnu Majah

* Ada bersamanya seumpamanya Syurga dan Neraka:

Di antara ujian Dajjal ialah kelihatan bersama dengannya seumpama syurga dan neraka dan juga sungai air dan sungai api. Dajjal akan menggunakan kedua-duanya ini untuk menguji iman org Islam kerana hakikat yg benar adalah sebalik dari apa yg kelihatan. Apa yg dikatakan Syurga itu sebenarnya Nerakadan apa yg dikatakannya Neraka itu adalah Syurga.

* Kepantasan perjalanan dan Negeri-Negeri yang tidak dapat dimasukinya:

Kepantasan yg dimaksudkan ini tidak ada pada kenderaan org dahulu. Kalauhari ini maka bolehlah kita mengatakan kepantasan itu seperti kepantasan jet-jet tempur yg digunakan oleh tentera udara atau lebih pantas lagidaripada kenderaan tersebut sehinggakan beribu-ribu kilometer dapat ditempuhdalam satu jam”… Kami bertanya: Wahai Rasulullah! Bagaimana kepantasan perjalanannya diatas muka bumi ini? Nabi menjawab:”Kepantasan perjalanannya adalah seperti kepantasan “Al Ghaist” (hujan atauawan) yang dipukul oleh angin yang kencang.” H.R Muslim
Namun demikian, Dajjal tetap tidak dapat memasuki dua Bandar suci umat Islam yaitu Makkah Al Mukarramah dan Madinah Al Munawwarah.

* Bantuan Syaitan-Syaitan untuk memperkukuhkan kedudukannya:

Syaitan juga akan bertungkus-lumus membantu Dajjal. Bagi syaitan, inilah masa yg terbaik utk menyesatkan lebih ramai lagi anak cucu Adam a.s.

How to Wire a Car Stereo Sound System

Quality Work With An Affordable Price

Contact Mr.Pojie +6017-6477528

Wiring your car stereo system yourself is a relatively simple process for those with even the most basic knowledge of electrical wiring or automotive repair, and is a great way to save money on your car stereo system.

INSTRUCTIONS

THINGS YOU'LL NEED:

• Guide to removing the dash and speaker panels of your car
• Pliers
• 9 volt battery
• Utility knife
• Wire cutters
• Screwdrivers
• Small piece of sand paper.
• Wire strippers
• Amplifier wiring kit
• Electrical tape
• 
  

Overview of Car Stereo Systems

1. 1
   Understand the basics of all car stereo systems. A car stereo system consists of 4 main components and the wiring that connects them. These are the head unit, the main speakers, optional amplifiers and the subwoofers, which are also optional but generally considered a necessary part of any good system.
2. 2
   Know that the core of any car stereo is the head unit, which is the cassette or CD player that goes in the dash. All the other components are connected to the head unit by at least one pair of wires.
3. 3
   Know about car speakers. The main speakers are usually 2 in the front and 2 in the back, although with what are known as component speakers, each speaker is broken down into two speakers: one for the highs and one for the bass. Each speaker or speaker set (known as a channel) connects to the head unit via a pair of wires. Generally if you are installing a new head unit you want to install new speakers.
4. 4
   Know about amplifiers. Amplifiers provide extra power to your speakers and/or extra channels of power for additional speakers. The most common use for an amplifier (amp) is to power subwoofers. The amp connects to your head unit via an RCA cable and often a "remote on" wire, and also connects directly to your car battery through a fused "hot" wire and to the car's chassis with a short ground wire. This article assumes the use of a single amplifier connected to a pair of subwoofers. If you do not have these components simply ignore the steps specific to the amp, doing so will not affect the rest of your installation.
5. 5
   Know about subwoofers. Subwoofers are part of any good stereo system. They provide the deep bass that small speakers cannot achieve. Subwoofers are connected to the amplifier which can usually be mounted right to the subwoofer box. If you do not have subwoofers you can simply ignore the steps specific to them.



Preparing for the Installation

6. 1
   Be properly prepared. This is extremely important since you do not want to realize you're missing something in the middle of the installation.
7. 2
   Purchase the following: A car stereo wire harness which connects the existing wiring for your old head unit to your new one (this will be specific to BOTH the model and year of your car AND to the make of your new head unit); an amplifier wiring kit which will contain all the wires to get power and signal to your amplifier; six feet of 14-gauge speaker wire for the subwoofers. Your speakers should have come with their own speaker wires.
8. 3
   Obtain a guide to removing the dash, doors panels (or whatever compartment the speakers are in), and floor molding of your car. You may be able to find a guide for this online. If not, you can get a repair manual for your car at most automotive stores and online).
9. 4
   Gather the following tools: Screwdrivers to fit the job, pliers, wire cutters, wire strippers, a utility knife, sand paper or a file, electrical tape, a 9-volt battery, and any other tools that the instructions for installing the head unit and your car guides specify.



The Installation

10. 1
    Disconnect the ground (negative) cable from your battery first and foremost. NEVER work on the electrical system of your car with this connected.
11. 2
    Install your new speakers. Start by removing the paneling of the speaker enclosure. Unscrew and disconnect the old speaker.
    
    Ideally the speaker wire will be connected to the old speakers with a metal clip that can then slide right on to your new ones. If not, cut the wire off the old speakers, strip about half an inch of it, then cut the last 6 inches or so off the speaker wire that came with your speakers so you have the proper connectors with a little wire attached, strip a half inch of those wires and twist connect them to the existing speaker wire. Bend the twists so they are in-line with the wire and wrap each connection in electrical tape so no wire is showing to protect them.
    
    Attach the connectors to your new speaker. Make sure to connect the negative wire (-/black) to the negative terminal on the speaker and the positive wire (+/red or white) to the positive one. Screw the speaker in place. If you have component speakers, and therefore a crossover, make sure the crossover is secured in the speaker compartment so that it does not bounce around while you drive.
    
    Wait to put the speaker enclosures back together until you have installed the head unit.
12. 3
    Follow the instructions you got for removing whatever part of the dash covers it and take out your existing head unit. Connect the car stereo wire harness to the connector that was attached to your old radio and attach the other end to your new one. Connect the antenna cable (the single wire with the big plug at the end) to your new head unit as well.
    
    If the speaker wires are separate from the harness connect them using the method of stripping, twisting, and taping described above. Do this one at a time or use masking tape to label the wire to avoid confusion. If you are having trouble figuring out which wires go to which speaker or which is positive and negative read the tip at the bottom of this section.
    
    Do not put your new head unit into the dash yet-you still need to connect the amplifier to it. Put the speaker enclosures back together now.
13. 4
    Attach the thick positive (+/red) power cable for your amplifier to the connector on positive terminal of your battery. The kit you purchased should have come with an o-ring on one end of the wire (you may have to crimp it on yourself, if so do it on the end with the fuse), this ring can be sandwiched in the bolt on the connector that connects your car to the battery.
14. 5
    Put the fuse in the fuse holder.
15. 6
    Run the power cable through the firewall of your car (there is usually an opening on the drivers side) and along to the back of the car where your amp is. It is usually best to run this wire under the plastic molding that goes along the bottom edge of your car, you never want the power cable to come near any speaker wires. At the same time run the remote on wire (a really thin wire from the amplifier wiring kit), through the dash where the head unit will sit, along with the power cable to the amp.
16. 7
    On the other side of the car run the RCA signal cable through the dash from the head unit to the amp (it's a pair of wires together with connectors on each end).
17. 8
    In the back of the car pick exactly where your amp and subwoofers are going to go. Part of choosing this is that the thick black ground cable (negative) needs to have a place to connect to the metal frame of your car. This should be as short as possible, you never want the ground cable to be longer than 3 feet.
18. 9
    Find a good screw or bolt, take if off and sandpaper the metal surface that the o-ring will make contact with, then screw it down tightly.
19. 10
    Attach the RCA signal cable and the remote on cable to your head unit and attach the power, ground, RCA signal, and remote on wires to your amp.
20. 11
    If you have not already done so, place your subwoofer box in the trunk and attach your amplifier to it if that is what you are doing. If you are not going to screw your amp to the subwoofer box then it must be secured to something else.
21. 12
    Attach the 14-gauge speaker wires to the left and right channels of the amplifier and to the speaker connectors of the subwoofer box.
22. 13
    Mount your head unit into the dash. Double check all of the connections on the back of it to make sure they are secure. Then slide your head unit into its slot in the dash and screw it securely in place. Before you re-attach the dash, reconnect the ground (negative) cable to your car battery and turn the stereo on and move around the car listening to each speaker to make sure everything is working properly. Then put the dash back on. You are all done!

TIPS & WARNINGS

• If you are preparing to hook up speaker wires and you are not sure which is negative and which is positive or which wires go to which speaker, take a 9-volt battery and touch the speaker wires to the the battery. One of the speakers will move. If the speaker moves forward (or out), then you have touched the positive lead of the speaker to the positive terminal of the battery. If the speaker moves back (or in) then the wire touching the positive terminal of the battery is the negative speaker wire.
• Never have your speaker or signal wires run near your amplifier's power cables. If they must cross do so perpendicularly and only in one spot.
• Never EVER work on the electrical system of your car with the ground wire attached to the battery. You can damage yourself and your equipment.