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Bassreflex design: port diameter is larger than speaker, will it work?



 
 
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  #1 (permalink)  
Old September 19th 08, 08:25 PM posted to uk.rec.audio
Trevor Wilson[_2_]
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Posts: 166
Default Bassreflex design: port diameter is larger than speaker, will it work?




"Stephen McLuckie" wrote in message
et...
Trevor Wilson wrote:


**If you use a bass guitar, then don't bother tuning much below 80Hz. For
lead/rhythm guitars, there is no need for any signal remotely that low.
Use a smaller box and tune higher.


I have been following this list for a while - mainly, but not always, as a
lurker - and I must say, I am in awe of the knowledge and expertise of the
people who post here. It's interesting, however, that there are a few
areas in which complete ignorance reigns.

Because the lowest frequency of a bass guitar cab (4-string) is around
40Hz, you should tune a bass guitar cab to around 45Hz. For normal
electric guitar, don't use a reflex cab, use a sealed cab or an
open-backed cab, depending on the parameters of the speaker.


**Nonsense. The lowest useful frequency from a bass guitar is higher than
80Hz. Almost no fundamental is audible. It's all second harmonic.


--
Trevor Wilson
www.rageaudio.com.au


  #2 (permalink)  
Old September 21st 08, 09:39 AM posted to uk.rec.audio
Stephen McLuckie
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Posts: 27
Default Bassreflex design: port diameter is larger than speaker, willit work?

Trevor Wilson wrote:


**Nonsense. The lowest useful frequency from a bass guitar is higher than
80Hz. Almost no fundamental is audible. It's all second harmonic.


Because it's an amplified instrument, the amount of fundamental present depends purely on how much you dial in. That, of course, depends on a lot of things, but an amplified bass is still quite capable of generating large amounts of 41Hz.

Commercial bass guitar amp manufacturers tune their cabs to between 40 and 50Hz. Some even mention this on their websites. If you can show me a company that tunes to above 80Hz, I'll give you a banana.
  #3 (permalink)  
Old September 21st 08, 02:24 PM posted to uk.rec.audio
Phil Allison
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Default Bassreflex design: port diameter is larger than speaker, will it work?


"Stephen McLuckie"
Trevor Wilson wrote:


**Nonsense. The lowest useful frequency from a bass guitar is higher than
80Hz. Almost no fundamental is audible. It's all second harmonic.


Because it's an amplified instrument, the amount of fundamental present
depends purely on how much you dial in.



** Plus, of course, how and where along its length the player excites the
string.


That, of course, depends on a lot of things, but an amplified bass is
still
quite capable of generating large amounts of 41 Hz.



** Pure sine wave are perfectly possible with many electric basses.


Commercial bass guitar amp manufacturers tune their cabs to between 40 and
50Hz. Some even mention this on their websites. If you can show
me a company that tunes to above 80Hz, I'll give you a banana.



** TW would appreciate that - being the trumped up Google monkey he is.

Bet he has never examined or tested an electric bass guitar in his life.

Nor any bass amp of any kind.




..... Phil




  #4 (permalink)  
Old September 22nd 08, 01:47 AM posted to uk.rec.audio
Trevor Wilson[_2_]
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Posts: 166
Default Bassreflex design: port diameter is larger than speaker, will it work?




"Stephen McLuckie" wrote in message
et...
Trevor Wilson wrote:


**Nonsense. The lowest useful frequency from a bass guitar is higher than
80Hz. Almost no fundamental is audible. It's all second harmonic.


Because it's an amplified instrument, the amount of fundamental present
depends purely on how much you dial in. That, of course, depends on a lot
of things, but an amplified bass is still quite capable of generating
large amounts of 41Hz.


**I've measured a few and none (that I've measured) deliver appreciable
amounts of fundamental. By appreciable, I mean more than 10dB below the
second harmonic.


Commercial bass guitar amp manufacturers tune their cabs to between 40 and
50Hz. Some even mention this on their websites. If you can show me a
company that tunes to above 80Hz, I'll give you a banana.


**Tuning above 80Hz would not be smart. Tuning APPRECIABLY below 80Hz is
simply wasteful. There is no point in tuning to 50Hz. IF (and I have
certainly not measured every guitar) a guitar exists that delivers
appreciable fundamental, then and only then, would there be a point to tune
at or around 40Hz.


--
Trevor Wilson
www.rageaudio.com.au


  #5 (permalink)  
Old September 22nd 08, 11:40 AM posted to uk.rec.audio
Arny Krueger
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Posts: 3,850
Default Bassreflex design: port diameter is larger than speaker, will it work?

"Trevor Wilson" wrote
in message

**Nonsense. The lowest useful frequency from a bass
guitar is higher than 80Hz. Almost no fundamental is
audible. It's all second harmonic.


Written by someone who has obviously never actually analyzed the signal that
comes out of a pickup from a bass guitar.

The fundamentals can be there if you don't lose them along the way.

I do suspect that few bass guitar amps are actually competent reproducers of
the region 32 Hz, which is approximately the fundamental of the lowest note
playable on a 5-string bass guitar.


  #6 (permalink)  
Old September 22nd 08, 06:04 PM posted to uk.rec.audio
Trevor Wilson[_2_]
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Posts: 166
Default Bassreflex design: port diameter is larger than speaker, will it work?



"Arny Krueger" wrote in message
...
"Trevor Wilson" wrote
in message

**Nonsense. The lowest useful frequency from a bass
guitar is higher than 80Hz. Almost no fundamental is
audible. It's all second harmonic.


Written by someone who has obviously never actually analyzed the signal
that comes out of a pickup from a bass guitar.


**Wrong, but I have certainly not examined all of them. In fact, I've only
examined 3 or 4. All were 4 string bass.


The fundamentals can be there if you don't lose them along the way.


**Sure. The fundamental is at such a low level, that few ever hear much of
it.


I do suspect that few bass guitar amps are actually competent reproducers
of the region 32 Hz, which is approximately the fundamental of the lowest
note playable on a 5-string bass guitar.


**The AMP may well be a competent reproducer of the lowest frequencies, but
the speakers rarely are. FWIW, most players filter out the lowest
frequencies anyway. They tend to prefer a 'faster' more 'articulate' bass.
This means that frequencies as high 1kHz are often boosted.


--
Trevor Wilson
www.rageaudio.com.au


  #7 (permalink)  
Old September 23rd 08, 12:05 AM posted to uk.rec.audio
Arny Krueger
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Posts: 3,850
Default Bassreflex design: port diameter is larger than speaker, will it work?

"Trevor Wilson" wrote
in message
"Arny Krueger" wrote in message
...
"Trevor Wilson"
wrote in message

**Nonsense. The lowest useful frequency from a bass
guitar is higher than 80Hz. Almost no fundamental is
audible. It's all second harmonic.


Written by someone who has obviously never actually
analyzed the signal that comes out of a pickup from a
bass guitar.


**Wrong, but I have certainly not examined all of them.
In fact, I've only examined 3 or 4. All were 4 string
bass.


The fundamentals can be there if you don't lose them
along the way.


**Sure. The fundamental is at such a low level, that few
ever hear much of it.


I just pulled up the bass track from a multitrack recording that I made at
church. The most intense harmonic was second, followed by fourth, third, and
fundamental. The fundamental was only 8 dB below the most intense harmonic,
the second.

I do suspect that few bass guitar amps are actually
competent reproducers of the region 32 Hz, which is
approximately the fundamental of the lowest note
playable on a 5-string bass guitar.


**The AMP may well be a competent reproducer of the
lowest frequencies, but the speakers rarely are.


Agreed in that I was speaking of "guitar amp", the common nomenclature for
an assembly that includes the speaker.

FWIW, most players filter out the lowest frequencies anyway.


Not the case with the players I record. We boost the bass end of this
channel pretty hard, with a pretty steep roll-off. I don't have the mixer
at hand, so I don't know the exact frequencies, Qs, and boost. If memory
serves, there's a 10 dB peak in the 40 Hz range, Q on the order 2, plus
other filters. Everthing above 2 Khz is filtered out very heavily, but
there's a big, more gentle roll-off starting around 150 Hz.

They tend to prefer a 'faster' more 'articulate' bass.
This means that frequencies as high 1kHz are often
boosted.


That gives you a sort of slappy, twangy sound. Different horses for
different courses.


  #8 (permalink)  
Old September 23rd 08, 09:34 AM posted to uk.rec.audio
Trevor Wilson[_2_]
external usenet poster
 
Posts: 166
Default Bassreflex design: port diameter is larger than speaker, will it work?




"Arny Krueger" wrote in message
. ..
"Trevor Wilson" wrote
in message
"Arny Krueger" wrote in message
...
"Trevor Wilson"
wrote in message

**Nonsense. The lowest useful frequency from a bass
guitar is higher than 80Hz. Almost no fundamental is
audible. It's all second harmonic.

Written by someone who has obviously never actually
analyzed the signal that comes out of a pickup from a
bass guitar.


**Wrong, but I have certainly not examined all of them.
In fact, I've only examined 3 or 4. All were 4 string
bass.


The fundamentals can be there if you don't lose them
along the way.


**Sure. The fundamental is at such a low level, that few
ever hear much of it.


I just pulled up the bass track from a multitrack recording that I made at
church. The most intense harmonic was second, followed by fourth, third,
and fundamental. The fundamental was only 8 dB below the most intense
harmonic, the second.


**Which is not too far from my own measurements.


I do suspect that few bass guitar amps are actually
competent reproducers of the region 32 Hz, which is
approximately the fundamental of the lowest note
playable on a 5-string bass guitar.


**The AMP may well be a competent reproducer of the
lowest frequencies, but the speakers rarely are.


Agreed in that I was speaking of "guitar amp", the common nomenclature for
an assembly that includes the speaker.

FWIW, most players filter out the lowest frequencies anyway.


Not the case with the players I record. We boost the bass end of this
channel pretty hard, with a pretty steep roll-off. I don't have the
mixer at hand, so I don't know the exact frequencies, Qs, and boost. If
memory serves, there's a 10 dB peak in the 40 Hz range, Q on the order
2, plus other filters. Everthing above 2 Khz is filtered out very heavily,
but there's a big, more gentle roll-off starting around 150 Hz.

They tend to prefer a 'faster' more 'articulate' bass.
This means that frequencies as high 1kHz are often
boosted.


That gives you a sort of slappy, twangy sound. Different horses for
different courses.


**Of course.


--
Trevor Wilson
www.rageaudio.com.au


 




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