that's the point where 'motional feedback' comes into play. This is the most effectif way combined with dsp. Because the real movement measured is better than the 'predicted' movement.
(non-linearities change when using the driver, be it by change of voicecoil-temperature, fresh or used suspension, etc)
G-sensors not only for women
(non-linearities change when using the driver, be it by change of voicecoil-temperature, fresh or used suspension, etc)
G-sensors not only for women
Svante said:So, sreten, you are basically saying that a high Qms is desirable, because this means that the mechanical losses are low, and that low mechanical losses is good since they mostly are nonlinear and hysterical (or whatever the adjective should be
Did I get you right?
I am not saying mechanical losses are mostly non-linear, just
that they are not perfectly linear and may have hysterisis effects.
At least one manafacturer, Audio-Physics states that high Qms
is desirable for a bass/mid, interview excerpt :
Well I for one can't find a driver with Qms below 1.5.
And it does smack of commercial manafactures pseudoscience hype.
All I'll say is a driver with a lowish Qms needs to designed very
carefully.
And there's no such thing as a horrendously high Qms.
sreten.
I'm the happy owner of fairly big speaker systems, wich I don't use for more than 10% of it abilities, but when you drive those little shoe-box-like systems to 70 or more % of their capacity, ......
I agree with sreten, playing with suspension characteristics is a janus play: if you don't do it right it's horrible (wich it is most of the time)
I agree with sreten, playing with suspension characteristics is a janus play: if you don't do it right it's horrible (wich it is most of the time)
Let's discribe it in another fashion:
Most, if not all instruments who produce low frequencies in a natural way are fairly big in size, agreed?
If you want reproduce this same sound out of a little housed speaker, you have to bring some tricks in play. Non-linear amplification (playing with equalizer knobs) or damping the natural frequencies of a system to relatively enhance response outside this optimum ie. to widden the optimum range.(with the optimum at a lower level !!!)
All 'tricks' are more or less a trade-off (bass-reflex versus closed box, suspension as discussed above, etc.)
As with all tricks: only few magicians, artists are really 'GREAT' in everything they do, most of them have a great performance now and than, but they often don't even know themselves why it was great.
Most great autopilots are great feedback loops, most gentlemen-drivers are not, what makes them bad racing-systems, despite the potentionally performing cars.
Brute horsepower requires 'handling' skills to lead it into victory. Most of the time a trade in horsepower/ torque gives better but average results, but the better pilot chooses for the brute force.
This is what makes following names great:
auto-racing: Walter Rorhl (naturally talented, put him in your wives car and it's a race car, suddenly)
music live band: Rolling Stones(give them 3 notes and they'll propose 20 hitsongs)
guitar: Jimmi Hendrix (extreme: the system in the system, could make 1 note hitsongs)
ampllifier design: Nelson Pass (yeah, bet this forum is one of his feedback loops). Give him 1 transistor, 1 resistor and a choke...he could even ask you why he would need all that...hehehe
Most, if not all instruments who produce low frequencies in a natural way are fairly big in size, agreed?
If you want reproduce this same sound out of a little housed speaker, you have to bring some tricks in play. Non-linear amplification (playing with equalizer knobs) or damping the natural frequencies of a system to relatively enhance response outside this optimum ie. to widden the optimum range.(with the optimum at a lower level !!!)
All 'tricks' are more or less a trade-off (bass-reflex versus closed box, suspension as discussed above, etc.)
As with all tricks: only few magicians, artists are really 'GREAT' in everything they do, most of them have a great performance now and than, but they often don't even know themselves why it was great.
Most great autopilots are great feedback loops, most gentlemen-drivers are not, what makes them bad racing-systems, despite the potentionally performing cars.
Brute horsepower requires 'handling' skills to lead it into victory. Most of the time a trade in horsepower/ torque gives better but average results, but the better pilot chooses for the brute force.
This is what makes following names great:
auto-racing: Walter Rorhl (naturally talented, put him in your wives car and it's a race car, suddenly)
music live band: Rolling Stones(give them 3 notes and they'll propose 20 hitsongs)
guitar: Jimmi Hendrix (extreme: the system in the system, could make 1 note hitsongs)
ampllifier design: Nelson Pass (yeah, bet this forum is one of his feedback loops). Give him 1 transistor, 1 resistor and a choke...he could even ask you why he would need all that...hehehe
Interesting thread, thanks to all.
But could someone please just provide a list of the following and what, to them, is a good value ? And applicable can you mention whether higher is better or worse for each one.
What i don't get is this: if this info is of no value, why is it even provided in the first place?
Resonant Frequency (Fs) Hz
DC Resistance (Re) ohms
Voice Coil Inductance (Le) mH
Mechanical Q (Qms)
Electromagnetic Q (Qes)
Total Q (Qts)
Compliance Equivalent Volume (Vas) ft.³
Mechanical Compliance of Suspension (Cms) mm/N
BL Product (BL) Tm
Diaphragm Mass Inc. Airload (Mms) g
Maximum Linear Excursion (Xmax) mm
The above criteria was taken from a product page on Parts Express.
Thanks a lot. I am sure this, if even possible to state, will help a considerable amount of total rookies like myself.
But could someone please just provide a list of the following and what, to them, is a good value ? And applicable can you mention whether higher is better or worse for each one.
What i don't get is this: if this info is of no value, why is it even provided in the first place?
Resonant Frequency (Fs) Hz
DC Resistance (Re) ohms
Voice Coil Inductance (Le) mH
Mechanical Q (Qms)
Electromagnetic Q (Qes)
Total Q (Qts)
Compliance Equivalent Volume (Vas) ft.³
Mechanical Compliance of Suspension (Cms) mm/N
BL Product (BL) Tm
Diaphragm Mass Inc. Airload (Mms) g
Maximum Linear Excursion (Xmax) mm
The above criteria was taken from a product page on Parts Express.
Thanks a lot. I am sure this, if even possible to state, will help a considerable amount of total rookies like myself.
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