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Merge with loudspeaker enclosure ?-- Light current 09:52, 24 July 2006 (UTC)
Oh I see loudspeaker enclosure is a sort of summary page is it?-- Light current 10:00, 24 July 2006 (UTC)
"Because of the complex frequency dependent loading, ported enclosures generally result in poorer transient response at low frequencies than in well-designed sealed box systems. Whether or not the effects of this in a properly designed system are audible are debatable."
I was surprised by this, as I've always thought it noticeable. Because bass reflexes produce resonant bass from the port, this has 2 noticeable effects:
Tabby ( talk) 13:21, 23 January 2008 (UTC)
I read some miss assumptions,
The designer can make many mistakes. You can't say a Bass reflex has poorer transient response, there are several variables.
1) It depends on a right port circumference to be > 30% of Sd good air load no air noise. To small circumference port will sound boomy (resonant).
2) And use a driver with the right parameters for BR. Low QTS about 0,45-0,25 and QES. (Only indication)
3) With low resonance frequency 20-30Hz so the speaker has good air load down to 20Hz by the bass reflex port tuning. So it can't resonate at any audible frequency.
The air load is caused by the opposite resonating air in the port, to the backside off the driver. And will also reduce the cone extrusion at the tuning frequency, benefit low distortion and good controlled drive of the voice coil (motor) at tuning frequency.
4) low BR-tuning brings the group delay to very low frequency's so that isn't audible <20ms (lower then 10msec would be even better).
5) Use efficient drivers so there is less energy storage in the driver/loudspeaker system that could cause a resonance.(driver high SPL small cone-extrusion by big circumference Sd)
When you do it right you have a transient response like a horn loaded speaker and also the sound. And more open dynamic sound than a closed box system.
Regards, Helmuth.Lageschaar
87.208.182.141 ( talk) 10:01, 12 December 2009 (UTC)
Sorry to say that this is mostly wrong. You need to find an accurate explanation of how a bass reflex enclosure actually works and do a complete rewrite. The current "explanation" is based on unscientific guesses of how they work. These guesses were proven to be incorrect by further research.
If I write an explanation, probably only engineers will understand it.
-- Tyrerj ( talk) 23:58, 30 May 2017 (UTC)
At
this edit, Editor
Wikiwald reverted
my edit with the edit summary Undid revision 1183056760 to ensure citation is in the APA/Chicago style.
This article uses Citation Style 1 templates (cs1). Citation Style 1 is not APA style, is not Chicago style. Yes, cs1 takes style cues from APA, Chicago, and other style guides but is none of them. cs1 also takes style cues from WP:MOS, in this case MOS:JR which says (in part):
Do not put a comma before Jr., Sr. (or variations such as Jnr), or a Roman numeral name suffix, whether it is patronymic or regnal: use Otis D. Wright II, not Otis D. Wright, II.
When the surname is shown first, the suffix follows the given name, as Kennedy, John F. Jr. or Wright, Otis D. II.
For the reasons described above, I have restored my edit to keep this article out of Category:CS1 maint: multiple names: authors list.
This article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
|
Merge with loudspeaker enclosure ?-- Light current 09:52, 24 July 2006 (UTC)
Oh I see loudspeaker enclosure is a sort of summary page is it?-- Light current 10:00, 24 July 2006 (UTC)
"Because of the complex frequency dependent loading, ported enclosures generally result in poorer transient response at low frequencies than in well-designed sealed box systems. Whether or not the effects of this in a properly designed system are audible are debatable."
I was surprised by this, as I've always thought it noticeable. Because bass reflexes produce resonant bass from the port, this has 2 noticeable effects:
Tabby ( talk) 13:21, 23 January 2008 (UTC)
I read some miss assumptions,
The designer can make many mistakes. You can't say a Bass reflex has poorer transient response, there are several variables.
1) It depends on a right port circumference to be > 30% of Sd good air load no air noise. To small circumference port will sound boomy (resonant).
2) And use a driver with the right parameters for BR. Low QTS about 0,45-0,25 and QES. (Only indication)
3) With low resonance frequency 20-30Hz so the speaker has good air load down to 20Hz by the bass reflex port tuning. So it can't resonate at any audible frequency.
The air load is caused by the opposite resonating air in the port, to the backside off the driver. And will also reduce the cone extrusion at the tuning frequency, benefit low distortion and good controlled drive of the voice coil (motor) at tuning frequency.
4) low BR-tuning brings the group delay to very low frequency's so that isn't audible <20ms (lower then 10msec would be even better).
5) Use efficient drivers so there is less energy storage in the driver/loudspeaker system that could cause a resonance.(driver high SPL small cone-extrusion by big circumference Sd)
When you do it right you have a transient response like a horn loaded speaker and also the sound. And more open dynamic sound than a closed box system.
Regards, Helmuth.Lageschaar
87.208.182.141 ( talk) 10:01, 12 December 2009 (UTC)
Sorry to say that this is mostly wrong. You need to find an accurate explanation of how a bass reflex enclosure actually works and do a complete rewrite. The current "explanation" is based on unscientific guesses of how they work. These guesses were proven to be incorrect by further research.
If I write an explanation, probably only engineers will understand it.
-- Tyrerj ( talk) 23:58, 30 May 2017 (UTC)
At
this edit, Editor
Wikiwald reverted
my edit with the edit summary Undid revision 1183056760 to ensure citation is in the APA/Chicago style.
This article uses Citation Style 1 templates (cs1). Citation Style 1 is not APA style, is not Chicago style. Yes, cs1 takes style cues from APA, Chicago, and other style guides but is none of them. cs1 also takes style cues from WP:MOS, in this case MOS:JR which says (in part):
Do not put a comma before Jr., Sr. (or variations such as Jnr), or a Roman numeral name suffix, whether it is patronymic or regnal: use Otis D. Wright II, not Otis D. Wright, II.
When the surname is shown first, the suffix follows the given name, as Kennedy, John F. Jr. or Wright, Otis D. II.
For the reasons described above, I have restored my edit to keep this article out of Category:CS1 maint: multiple names: authors list.