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Thread: pictures of car audio stuffs

  1. Back To Top    #31
    Team Knuckledragger papacueball's Avatar
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    Re: pictures of car audio stuffs

    They made that interior into the mid 90's. Aftermarket dash kits relocated a single din to the cupholder area in the middle of the dash.

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    ~Paw~Paw})]<^>¥ Hic's Avatar
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    Anyone remember : Stillwater Designs?
    I have a gray amp (500 si ). NOS w/3 - 40 amp fuses , 250 W per channel !

    Ics didn`t load ?

    Basically, An old stereo amplifier (Kicker)with box, minus any connection marks on screws/rca inputs or outputs, power/ground/remote/ and four speaker connection terminals

    Stillwater, OK 74075

    5021 N. Perkins Rd.
    Made in U. S. A.

    18" L x 7 1/4" W , { heatsink fins an 1 1/2" tall }
    Last edited by papacueball; 01-20-2019 at 06:40 PM.
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    Re: pictures of car audio stuffs

    Why would I put a neodymium magnet on the butt of my fiQ 12 inch sub ?

    https://www.grainger.com/product/GRA..._vc=IDPPLARECS

    What does the N35, N40, N42, N45, N48, N50, N52 grade mean? Neodymiummagnets are graded by the maximum strength they can be magnetized to. The higher the number the stronger the magnet is, however the higher the number the more brittle the magnet becomes as well.
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    Noob Mr Marv's Avatar
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    Re: pictures of car audio stuffs

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  5. Back To Top    #35
    ~Paw~Paw})]<^>¥ Hic's Avatar
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    Re: pictures of car audio stuffs

    some speakers have a "bias" adjustment !

    BMagnetic flux density in gap, in Tesla-meters (TM)

    BL
    The magnetic strength of the motor structure.

    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)



    BL²/Re

    Most manufactures will not spec this number, however we feel it inappropriate to omit it.


    Quote Originally Posted by Hic View Post
    Why would I put a neodymium magnet on the butt of my fiQ 12 inch sub ?
    B
    Magnetic flux density in gap, in Tesla-meters (TM)


    BL
    The magnetic strength of the motor structure.

    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)


    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.


    BL Curve
    A graph of the magnetic strength of the speaker's motor structure across the frequency spectrum of the speaker's operating range.


    C
    Propagation velocity of sound at STP, approx. 342 m/s


    Cas
    Acoustical equivalent of Cms


    Cmes
    The electrical capacitive equivalent of Mms, in farads


    Cms
    The driver's mechanical compliance (reciprocal of stiffness), in m/N


    D
    Effective diameter of driver, in meters


    DUMAX
    A driver measurement system that can, among other things, measure how far a driver's cone can travel while still working in a linear fashion.


    F3
    -3 dB cutoff frequency, in Hz


    Fb
    Enclosure resonance (usually for bass reflex systems), in Hz


    Fc
    System resonance (usually for sealed box systems), in Hz


    Fs

    Driver free air resonance, in Hz. This is the point at which driver impedance is maximum.

    L
    length of wire immersed in magnetic field, in meters


    Lces
    The electrical inductive equivalent of Cms, in henries


    Le
    This is the voice coil inductance measured in millihenries (mH). The industry standard is to measure inductance at 1,000 Hz. As frequencies get higher there will be a rise in impedance above Re. This is because the voice coil is acting as an inductor. Consequently, the impedance of a speaker is not a fixed resistance, but can be represented as a curve that changes as the input frequency changes. Maximum impedance (Zmax) occurs at Fs.


    Ms
    The total moving mass of the loudspeaker cone.


    Mmd
    Diaphram mass, in grams


    Mms
    The driver's effective mechanical mass (including air load), in kg


    n0
    The reference efficiency of the system (eta sub 0) dimensionless, usually expressed as %


    p
    (rho) Density of air at STP 1.18 kg/m^3


    Pa
    Acoustical power


    Pe
    Electrical power


    Q
    The relative damping of a loudspeaker


    Qa
    The system's Q at Fb, due to absorption losses; dimensionless


    Qec
    The system's Q at resonance (Fc), due to electrical losses; dimensionless


    Qes
    The driver's Q at resonance (Fs), due to electrical losses; dimensionless


    Ql
    The system's Q at Fb, due to leakage losses; dimensionless


    Qmc
    The system's Q at resonance (Fc), due to mechanical losses; dimensionless


    Qms
    The driver's Q at resonance (Fs), due to mechanical losses; dimensionless


    Qp
    The system's Q at Fb, due to port losses (turbulence, viscousity, etc.); dimensionless

    Qtc
    The system's Q at resonance (Fc), due to all losses; dimensionless

    Qts
    The driver's Q at resonance (Fs), due to all losses; dimensionless


    R
    Ripple, in dB


    Ras
    Acoustical equivalent of Rms


    Res
    The electrical resistive equivalent of Rms, in ohms


    Revc
    DC voice coil resistance, in ohms


    Rg
    Amplifier source resistance (includes leads, crossover, etc.), in ohms


    Rms
    The driver's mechanical losses, in kg/s


    SAF
    Spouse Acceptance Factor. Basically, a rough measurement of what you can get away with in the house before your better half (who usually controls the finances as well) raises a fuss.


    Sd
    Effective piston radiating area of driver, in square meters


    SPL
    Sound Pressure Level, usually measured at 1 watt, at 1 meter in front of the loudspeaker


    SQL
    Term used to define a speaker or system with a balance between focuses on SPL and SQ.


    SQ
    Sound Quality. A term that refers to a focus on accuracy and transparancy as opposed to a focus on how loud the speaker or system can get.


    Vas/Cms
    "Equivalent volume of compliance", this is a volume of air whose compliance is the same as a driver's acoustical compliance Cms (q.v.), in cubic meters. "Vas represents the volume of air that when compressed to one cubic meter exerts the same force as the compliance (Cms) of the suspension in a particular speaker. Vas is one of the trickiest parameters to measure because air pressure changes relative to humidity and temperature — a precisely controlled lab environment is essential. Cms is measured in meters per Newton. Cms is the force exerted by the mechanical suspension of the speaker. It is simply a measurement of its stiffness. Considering stiffness (Cms), in conjunction with the Q parameters gives rise to the kind of subjective decisions made by car manufacturers when tuning cars between comfort to carry the president and precision to go racing. Think of the peaks and valleys of audio signals like a road surface then consider that the ideal speaker suspension is like car suspension that can traverse the rockiest terrain with race-car precision and sensitivity at the speed of a fighter plane. It’s quite a challenge because focusing on any one discipline tends to have a detrimental effect on the others. "


    Vd
    Maximum linear volume of displacement of the driver (product of Sd times Xmax), in cubic meters.


    Xmag
    Excursion limit due to the magnetic limitations of the driver's motor. Xmag is defined as the displacement at which the BL product has fallen to 70% of its value at the cone's rest position.


    Xmax
    Linear (one-way) travel of the cone. Xmax is used to determine the maximum linear SPL capability of the driver, and can be defined in a number of ways. The DUMAX definition is objectively the best one, and it is defined as the shorter of the Xmag and Xsus values, in each direction of cone travel. This definition is more useful than the older definition of Xmax, which was solely dependent on the length of the voice-coil vs. the length of the gap.


    Xmech
    Maximum physical excursion capability of the driver. Exceeding Xmech normally results in damage to the driver.Excursion limit due to the driver's suspension.


    Xsus
    The point at which the compliance of the suspension has decreased to 25% of the value at the cone's rest position.


    Zmax

    This parameter represents the speaker’s impedance at resonance.
    It has nothing to do with T/S parameters . . . I put it there because it stuck . . .
    Last edited by Hic; 05-31-2019 at 09:38 AM.
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  6. Back To Top    #36
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    Re: pictures of car audio stuffs

    https://www.khanacademy.org/science/.../v/magnetism-2
    Magnetic force on a charge

    shows how to find the size and direction of the magnetic force using F=qvB and the right hand rule.
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  7. Back To Top    #37
    ~Paw~Paw})]<^>¥ Hic's Avatar
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    Re: pictures of car audio stuffs

    Listenin to Coldplay recorded in Vista Alegre Bull Ring , Madrid 2003.
    Listened to John Mayer Any Given Thursday recorded in Oak Mountain Amphitheater Birmingham , Alabama on September 12, 2002

    If you have ever stood in front of the stage and heard the kick drum, that`s what this fiQ sounds like!
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  8. Back To Top    #38
    ~Paw~Paw})]<^>¥ Hic's Avatar
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    Re: pictures of car audio stuffs

    Played some LZ, Rush 30, Aerosmith . . . Yup fiQ is killin it !
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  9. Back To Top    #39
    ~Paw~Paw})]<^>¥ Hic's Avatar
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    Re: pictures of car audio stuffs

    [This one with a magnet on butt is hardest driving sound quality driver !

    My 800SW drove one-half of a CV dual voice coil sub (24 amps and 12 subs).g

    Quote Originally Posted by Hic View Post
    Cerwin - Vega's " Stroker Pro " up above/preceding post.

    Features:

    Bias adustment - tunable for sound quality ( SQ ) or sound pressure level ( SPL )

    Dual Gap Technology - allowing maximum linear excursion

    Heat sinking frame - higher power handling and lower distortion

    Front spider - stabilizes voice coil in extreme excursion

    Dual lower spiders - optimum suspension linearity for SQ

    Ported enclosure optimum ( 1.2 cu ft )/ Sealed enclosure optimum ( 0.7 cu ft )

    Fs - 27 Hz
    Xmax 40 mm
    2 ohm dual voice coil
    sensitivity 84 dB
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  10. Back To Top    #40
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    Re: pictures of car audio stuffs

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    A 1 ohm dvc connected to carbon fiber cone ( digital designs 12" G model )

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