download the free and nice irfanview
file>batch coversion> add the file
on advanced>resize set 640 and see if the out file is small, diyaudio Maximum size: 102400 bytes
file>batch coversion> add the file
on advanced>resize set 640 and see if the out file is small, diyaudio Maximum size: 102400 bytes
Link to graph of the LB12 (same as 12EX):
http://i39.tinypic.com/j13eb6.png
Caractéristiques principales
FR 34 Hz
W 40 Watts
Z 16 Ohms
BP 35-15 Khz
Mms 37 gr
BL 20,641
Xmax 3 mm
FA 558
Eff 97,5 dB
Paramètres
Thièle et Small
RCC 11,7 Ohms
Qms 6,325
Qes 0,221
Qts 0,213
Rms 1,271
S 5 dm²
Vas 200 L
R 3,6 %
Le 0,8 mH
http://i39.tinypic.com/j13eb6.png
Caractéristiques principales
FR 34 Hz
W 40 Watts
Z 16 Ohms
BP 35-15 Khz
Mms 37 gr
BL 20,641
Xmax 3 mm
FA 558
Eff 97,5 dB
Paramètres
Thièle et Small
RCC 11,7 Ohms
Qms 6,325
Qes 0,221
Qts 0,213
Rms 1,271
S 5 dm²
Vas 200 L
R 3,6 %
Le 0,8 mH
tinitus said:
Oddly, the dip and the impedance issue do not occur together. The impedance bump occurs just under 300hz and the FR dip is centered just over 400hz.
This also claims to be a 15 degree off axis plot at 3.6M in a undefinded BR box - there is really no way to draw any conclusions sub 1Khz from this FR information.
emspeaker LB7-
Just a ( ) : intersting reading about noise and vibration control.
You go to the white papers and you find some sound info on
the question of the use of passive accoustical material.
Basic explanation that can be used in audio: speaker building,
room treatment etc. Basic but essential. .
Don't know this co ; I just happen to go on their site.
http://www.earsc.com/HOME/engineering/TechnicalWhitePapers/index.asp?SID=11
Just a ( ) : intersting reading about noise and vibration control.
You go to the white papers and you find some sound info on
the question of the use of passive accoustical material.
Basic explanation that can be used in audio: speaker building,
room treatment etc. Basic but essential. .
Don't know this co ; I just happen to go on their site.
http://www.earsc.com/HOME/engineering/TechnicalWhitePapers/index.asp?SID=11
The dip of the LB12 around 400hz is caused by the
speaker cabinet: 100% certain. The Emspeaker drivers are
linear, not perfect but linear. EX. if you look at the frequency
plot of the LB7 (taken in free air -15 degree) you find the
same linearity: + or - 2db from 1khz to 20khz. This with no whizzer.
You don't have in either the LB12 nor the LB7 this increase in
sound as you get higher in frequency and the peaks in the
high frequencies generally associated with full range driver.
There is a balance hf-mid. Some full range driver might
have too much hf compare to mf.
It can result is listener fatigue, harshness and
if combine with distortion , it could be very anoying.
But it also can be corrected and the result can very good,
even great .
So you save your EQ for the low frequency depending on your
room modes.
speaker cabinet: 100% certain. The Emspeaker drivers are
linear, not perfect but linear. EX. if you look at the frequency
plot of the LB7 (taken in free air -15 degree) you find the
same linearity: + or - 2db from 1khz to 20khz. This with no whizzer.
You don't have in either the LB12 nor the LB7 this increase in
sound as you get higher in frequency and the peaks in the
high frequencies generally associated with full range driver.
There is a balance hf-mid. Some full range driver might
have too much hf compare to mf.
It can result is listener fatigue, harshness and
if combine with distortion , it could be very anoying.
But it also can be corrected and the result can very good,
even great .
So you save your EQ for the low frequency depending on your
room modes.
If you listen for10min to the LB12, you will notice in the sound
the characteristic of the design of this driver.
1- -high spl- the sound fills the room (sound for big orchestra):
2- smoothness- linear -well balance md-hf.
3- low qts-qes- big motor+light cones: this is the basic design
priciple of Emspeaker to give fast, dynamic sound with
tight bass.
4- good off-axis response: you don't need to be exactly in the
sweetspot to enjoy music. The big wooden phase plug helps here.
5-voices are full- probably caused by the lower mids of a 12 inch.
So the frequency plot gives some info but the final test will remain
the 10 min. test.
the characteristic of the design of this driver.
1- -high spl- the sound fills the room (sound for big orchestra):
2- smoothness- linear -well balance md-hf.
3- low qts-qes- big motor+light cones: this is the basic design
priciple of Emspeaker to give fast, dynamic sound with
tight bass.
4- good off-axis response: you don't need to be exactly in the
sweetspot to enjoy music. The big wooden phase plug helps here.
5-voices are full- probably caused by the lower mids of a 12 inch.
So the frequency plot gives some info but the final test will remain
the 10 min. test.
emspeaker LB15
Well, they had a newborn in the Fertin family, that might be the
reason.....e-mai mel, I can give you pretty much all the info
you need.
Well, they had a newborn in the Fertin family, that might be the
reason.....e-mai mel, I can give you pretty much all the info
you need.
Gilles, mind to translate (Kathy reply to my inquiry about <200hz response of the LB12)?
Bonjour,
La courbe de réponse en dessous de 200hZ dépend du baffle, de la résistance interne de l'ampli et des résonnances produites par la pièce d'écoute.
La courbe jointe est la courbe théorique calculée pour un bass reflex de 120L avec un évent de 75mm de diamètre et 25mm de profondeur attaquée par un amplificateur dont la résistance interne est de 8 ohms (par exemple un single ended de 300B).
L'efficacité réduite à 95dB résulte du fait que pour le calcul de cette courbe la résistance interne de l'ampli a été simulée avec une résistance en série de 8 ohms.
Dans le cas sité plus haut, de l'utilisation d'un ampli de 8 ohms de résistance interne, on retrouve l'efficacité de 97,5dB.
On peut donc obtenir une bande passante globale de 40hZ à 15Khz avec une réponse transitoire rapide (FA 558 dans le grave, et 1200 dans l'aigu).
Restant à votre entière disposition, recevez nos meilleures salutations.
Fertin.
Bonjour,
La courbe de réponse en dessous de 200hZ dépend du baffle, de la résistance interne de l'ampli et des résonnances produites par la pièce d'écoute.
La courbe jointe est la courbe théorique calculée pour un bass reflex de 120L avec un évent de 75mm de diamètre et 25mm de profondeur attaquée par un amplificateur dont la résistance interne est de 8 ohms (par exemple un single ended de 300B).
L'efficacité réduite à 95dB résulte du fait que pour le calcul de cette courbe la résistance interne de l'ampli a été simulée avec une résistance en série de 8 ohms.
Dans le cas sité plus haut, de l'utilisation d'un ampli de 8 ohms de résistance interne, on retrouve l'efficacité de 97,5dB.
On peut donc obtenir une bande passante globale de 40hZ à 15Khz avec une réponse transitoire rapide (FA 558 dans le grave, et 1200 dans l'aigu).
Restant à votre entière disposition, recevez nos meilleures salutations.
Fertin.
Translation: here it goes...
Hi,
The frequency response curve below 200hz depends on the baffle,
the internal amp. resistance (impedance) and the room resonances
(room modes).
The frequency plot that you have was calculated for a bass reflex
of 120liters with a vent diameter of 75mm and a depth of 25mm
driven with an amp with an internal resistance of 8ohms
( for example a 300B set amp).
The efficiency that was reduced to 95db results from the fact that
the frequency plot was calculated with an amp with an 8 ohm
resistor in serie.
In the case mentioned above ( with the 8 ohm internal resistance amp) , we get a 97.5db efficiency.
We can thus get a frequency range from 40hz to 15khz with a fast
transit response ( acc. factor of 558 in the lf and 1200 in the hf.
Hope this help....
Hi,
The frequency response curve below 200hz depends on the baffle,
the internal amp. resistance (impedance) and the room resonances
(room modes).
The frequency plot that you have was calculated for a bass reflex
of 120liters with a vent diameter of 75mm and a depth of 25mm
driven with an amp with an internal resistance of 8ohms
( for example a 300B set amp).
The efficiency that was reduced to 95db results from the fact that
the frequency plot was calculated with an amp with an 8 ohm
resistor in serie.
In the case mentioned above ( with the 8 ohm internal resistance amp) , we get a 97.5db efficiency.
We can thus get a frequency range from 40hz to 15khz with a fast
transit response ( acc. factor of 558 in the lf and 1200 in the hf.
Hope this help....
lrntglls said:
Yes, thanks it helped. The last part was where i needed most help. Fast transient are VERY important for me.
Besides that little dip, this driver is looking more and more interesting, and I can make it fit my budget.
In my simulation it can be cut anywhere between 70 and 200hz (IF i'll cut it) without changing much on the graph. Pretty amazing. And the wood phase plug looks so cool too 🙂
LB7 or LB12?
I'm seriously thinking to try these drivers. They are priced very well (cannot affort the field coil model), the communication from Catherine Fertin is nice (although 99% in french) and my ears wants LINEAR drivers.
OB use, at average SPL, with bass reinforcement, in pretty small room.
Which would be your suggestion? I'm comparing pictures and graphs, but the graphs are really not comparable since the LB12 one is in BR and not in IB.
I'm seriously thinking to try these drivers. They are priced very well (cannot affort the field coil model), the communication from Catherine Fertin is nice (although 99% in french) and my ears wants LINEAR drivers.
OB use, at average SPL, with bass reinforcement, in pretty small room.
Which would be your suggestion? I'm comparing pictures and graphs, but the graphs are really not comparable since the LB12 one is in BR and not in IB.
Even if you have a small room , I would go with the
LB12. If you want to go open-baffle then you need bass
reinforcement. If you choose a box (Double reflex box or TL)
then you'll get a very realistic bass, no EQ, no xover with the LB12.
You'll like listening to the LB12....
LB12. If you want to go open-baffle then you need bass
reinforcement. If you choose a box (Double reflex box or TL)
then you'll get a very realistic bass, no EQ, no xover with the LB12.
You'll like listening to the LB12....
lrntglls said:
Doh! I was thinking the opposite, while writing an email to you. 🙂
I think that for my room a 10" speaker is the absolute ideal size, more and I think the instruments and soundstage can get magnified. Maybe Kathy will make this size of speaker too one day.
Do you think that the LB12 is also more linear? this could be a factor.
decisions, decisions...
lrntglls said:
3,5x5m - 3,3m height. With two weird niche, windows and a not straight wall.
Still most of the probs are under 150hz, where i'll need to equalize.
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