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

New original Defi Advance A1 NA package triple...
- Started by david tao
- Engine and Performance
original rare Rays Volk Racing CE28 16x7jj offset...
- Started by david tao
- Chassis and Wheels
Honda Jazz/Fit JSracing GTwing Spoiler
- Started by jeff6126
- Exterior and Body
Toyota Vios NCP93 front bonnet hood
- Started by jeff6126
- Exterior and Body
Honda civic fc varis spoiler
- Started by jeff6126
- Exterior and Body
BMW F10 Msport front bumper set
- Started by jeff6126
- Exterior and Body
BMW F30 M3/GTS front bonnet hood
- Started by jeff6126
- Exterior and Body
BMW F10 vorsteiner rear bumper diffuser
- Started by jeff6126
- Exterior and Body
Mitsubishi Lancer Evo bodykit
- Started by jeff6126
- Exterior and Body
BMW F30 M3 front skirt lip
- Started by jeff6126
- Exterior and Body

Posts refresh every 5 minutes

Double podium for Jazeman at British F3 opener

https://www.zerotohundred.com/wp-content/uploads/2011/04/JJ-celebrates-first-podium-of-the-season-in-Monza-600x399.jpg

It was a strong showing by...

Activities Gallery

I think we should post a photo of any activities (gathering/TT/mapeley session..etcc.etc) that has been done so far. Nice to see what have been done previously. Also can morale for future activities.

By the way, I...

wtb

Nissan Skyline R34 Gtr Rims!

skyline r34 rims?
anyone?how much?

Search

Enjoying Zerotohundred?

Log-in for an ad-less experience

Reply to thread

The Marketplace Latest

New original Defi Advance A1 NA package triple...

original rare Rays Volk Racing CE28 16x7jj offset...

Honda Jazz/Fit JSracing GTwing Spoiler

Toyota Vios NCP93 front bonnet hood

Honda civic fc varis spoiler

BMW F10 Msport front bumper set

BMW F30 M3/GTS front bonnet hood

BMW F10 vorsteiner rear bumper diffuser

Mitsubishi Lancer Evo bodykit

BMW F30 M3 front skirt lip

Posts refresh every 5 minutes

Recent Posts

Darker Design : Mercedes-Benz Launches GLA Nightfall Edition in Malaysia

Honda Malaysia Doubles Down on Hybrids: New CR-V Launches with Dual e:HEV...

BateriHub Reaches 200-Store Milestone, Becomes Malaysia’s Largest...

Been stalking for 3 years edy

Recommendation: Turbocharger for 4B11 N.A engine

Search

Online now

Enjoying Zerotohundred?