Reply to thread

See what others are reading now! Try Forums > Current Activity

Message: <blockquote data-quote="Pjam" data-source="post: 721647" data-attributes="member: 14038">actually, there are not fixed rules, some manufacturers recommend ported box for their sub, some sealed... here r some extracts from an expert.. edited 4 shorter explanation.. hope it helps :) SealedBasically as far as sealed is concerned, the relationship between the characterisitics of the speaker being used and the volume of air inside the enclosure dictates the how well the sub will sound. When the enclosure is bigger, the air spring limits cone motion less and allows the system to play lower and with flatter overall response (lower Qtc) at the expense of power handling. Problem is if you go too large you start to compromise efficiency in order to gain the additional low frequency extension. On the other hand, making the enclosure smaller will cause the air spring to exert more control and limits cone motion at low frequencies which increases power handling but does not let the system play as low and produces a more peaked response (higher Qtc). PortedDepending on the sound you desire, you tune a port to a certain frequency to achieve better bass response around that frequency. The tuning of the port there must be done using careful calculations which take into consideration the enclosure volume, the resonance of the port and the Thiele / Small parameters of the sub into consideration. Using these we attempt to delay the rear output wave of the speaker just enough so that when it comes out of the port it is close to being in phase with the wave being produced by the front of the sub. By altering the port length and diamter, we tuned the port to a certain frequency. The reason ported enclosures are generally considered louder is that when we utilise the work of the rear of the cone we gain double the bass, or 3dB over a broad range of frequencies. BandpassWith bandpass enclosures the woofer no longer plays directly into the listening area. Instead the entire output of the subwoofer system is produced through the port or series of ports. In a conventional sealed or ported enclosure the low-frequency extension is controlled by the interaction of the speaker and the enclosure design but the high frequency response is a result of the speaker's natural frequency response capability unless limited by a crossover. In a bandpass enclosure the front of the speaker fires into a chamber which is tuned by a port. This ported front chamber acts as a low-pass filter which acoustically limits the high frequency response of the subwoofer system. The name "bandpass" is really pretty descriptive in that it refers to the fact that the enclosure will only allow a certain frequency "band" to "pass" into the listening environment.</blockquote>

Verification

The Marketplace Latest

original rare Rays Volk Racing CE28 17x8jj offset...
- Started by david tao
- Chassis and Wheels
Evasive EVS Tuning Carbon Body Kit Honda Civic Type...
- Started by aycy
- Exterior and Body
Mugen MS-C Full Bucket Seat Civic Type R FL5 FK8
- Started by aycy
- Engine and Performance
Boost Logic Boostlogic Oil Cooler Kit R35 GTR GTR35
- Started by aycy
- Engine and Performance
Linney IHI 800WHP Turbo Kit R35 GTR35 GTR
- Started by aycy
- Engine and Performance
Varis R35 GTR GTR35 Front Bumper
- Started by aycy
- Exterior and Body
HKS Spec R Titanium Exhaust with Y pipe R35 GTR GTR35
- Started by aycy
- Engine and Performance
2016 BMW 120i LCI M Sport F20 1.6 Auto
- Started by aycy
- Cars for sale
GR Yaris H&R Front Rear Anti Roll Bar
- Started by aycy
- Chassis and Wheels
BBS RI-A 10J God Spec FK8 FL5 Honda Civic Type R...
- Started by aycy
- Chassis and Wheels

Posts refresh every 5 minutes

Vios Challenge & Toyota Gazoo Racing Festival now in Malaysia!*

The Toyota Gazoo Racing (TGR) Festival is now in Malaysia guys. Starting off with the Vios Challenge, it is a one make cup series made up of 30 identical Toyota Vios race cars.

The TGR Festival is a huge weekend...

Gallardo MLE: Malaysia gets their own Limited Edition!

https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-ash4/s720x720/383534_259433220821428_116211298476955_516566_1739568537_n.jpg

It took awhile, but we can now proudly say that we have a supercar to call our own (sort...

These funny-car styled GT-R drag racers are no laughing matter

https://www.zerotohundred.com/wp-content/uploads/2011/07/01-1311080895-600x401.jpg

The Nissan GT-R has been killing it on almost every type of racing it has entered, be it circuit, road rallies and even drag racing...