| Author |
Thread: Comprehensive list of various driver parameters |
    
Silver Member Username: Domenico
Glendale,
AZ
USA
Post Number: 154
Registered: Apr-09
|
| Posted on Wednesday, October 28, 2009 - 03:10 pm: |
|
Performance Parameters:
BL²/Re
Most manufactures will not spec this number, however we feel it inappropriate to omit it.
BL is the actual cross product of the magnet field B with the conductor length L. It is not a scalar, but rather a vector. Combine this vector with the current I and you’ll get exactly the force (up or down according to the DC or AC input). But with the way amplifiers are designed, the current I of the speaker is never constant, only the voltage is. It is also not entirely important to know what the force is because is changes so rapidly. In any event, the BL squared divided by the resistance of the voice coil Re in fact gives us a generic force factor in newtons squared per watt. This number is relative for all speakers and the higher the number, the more force a motor can invoke on a cone with the same input power.
Its important to distinguish that BL and Re are related much like inductance and Re are. 32Tm over 8 ohms is identical to 16Tm over 2 ohms, namely 128 N²/W. All other things equal (moving mass and cone size in particualr), A higher BL²/Re will increase the sensitivity of the driver which is a generally a very good thing.
TLS
An Audiopulse exclusive parameter which goes beyond the diluted “xmax” standard. We define TLS to be the one way total linear stroke of less than 1% BL deviation. That is the threshold of virtually zero non-linear BL distortion. This parameter is often extremely low among the vast majority of drivers and it is important to know that a high TLS usually yields a very low distortion driver.
-----------------------------------------------------------------
Theile Small Parameters:
BL
The cross product of the magnetic gauss in the gap ‘B’ with the effective conductor length ‘L’. BL is measured in Tesla meters or Newtons per Ampere (same units)
Cab
Compliance of the driver inside the box.
Cas
Compliance (1/stiffness) of the driver’s suspension system measured in (same as Cms).
Cms
Compliance (1/stiffness) of the driver’s suspension system (same as Cas).
Fc
Resonance frequency of the driver in a closed box system.
Fs
Resonance frequency of the driver in free air.
Lp
Inductance in a parallel circuit model with the Rp resistor
Ls
Inductance in a series circuit model with the Rp resistor
Q
Ratio of reactance to resistance or vice versa. This terms can apply to mechanical, electrical or even pneumatics’s models. Its often used to describe drivers (Qts), filters or entire systems (Qb).
Qes
The Q of the driver at Fs as a function of electromotive damping factor.
Qms
The Q of the driver at Fs as a function of the mechanical damping factor.
Qts
The combine factor of Qes and Qms of the driver.
Rp
Resistor used in the inductance circuit model with either Ls or Lp
Sd
The effective surface area of the driver’s cone.
Vab
The volume of air which has the same compliance as driver inside an enclosure.
Vas
The volume of air which has the same compliance as the drivers suspension in free air.
Vb
Net volume of an enclosure.
Vd
Maximum linear displacement that the driver can do. |
|
|
|
Gold Member Username: Big_edge_head
Milwaukee,
WI
Post Number: 4201
Registered: Mar-07
|
| Posted on Wednesday, October 28, 2009 - 03:27 pm: |
|
Congratulations you know how to copy and paste... |
Silver Member Username: Domenico
Glendale,
AZ
USA
Post Number: 158
Registered: Apr-09
|
| Posted on Wednesday, October 28, 2009 - 03:29 pm: |
|
okay? congrats you know how to point out a copy and paste...
f*uckin tool bag. |
Gold Member Username: Big_edge_head
Milwaukee,
WI
Post Number: 4202
Registered: Mar-07
|
| Posted on Wednesday, October 28, 2009 - 03:31 pm: |
|
You're a dumbass. What's the point of these threads? |
Diamond Member Username: Wingmanalive
Www.stainles...
.ecrater.com
Post Number: 21529
Registered: Jun-06
|
| Posted on Wednesday, October 28, 2009 - 03:31 pm: |
|
Good info but always give credit. Shows respect to any author. |
Gold Member Username: Big_edge_head
Milwaukee,
WI
Post Number: 4203
Registered: Mar-07
|
| Posted on Wednesday, October 28, 2009 - 03:32 pm: |
|
Yeah what were you thinking? Everyone here was gonna think it was you and think you're all smart? Dumbasssss |
Silver Member Username: Domenico
Glendale,
AZ
USA
Post Number: 160
Registered: Apr-09
|
| Posted on Wednesday, October 28, 2009 - 03:35 pm: |
|
no you moron... why the sh!t would i want to take credit for this?
just decided to post it incase someone wanted to know what it ment. |
Gold Member Username: Drant19
DUB-C,
TX
Post Number: 2116
Registered: Aug-07
|
| Posted on Wednesday, October 28, 2009 - 06:20 pm: |
|
this forum doesnt have stickys, so this is kinda useless...
dont mean to bust your chops but if someone wanted the info, they can just google it like everyone else. |
Silver Member Username: Cozce
St. Louis ILLside,
Pronounced: ...
U.S.A.
Post Number: 855
Registered: Mar-08
|
| Posted on Wednesday, October 28, 2009 - 07:20 pm: |
|
He uses the info to copy and paste, then calls someone who calls him out on it a toolbag.
Priceless. |
