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Epifani / Eminence Driver Swap?

Discussion in 'Amps and Cabs [BG]' started by ::::BASSIST::::, Sep 5, 2008.


  1. ::::BASSIST::::

    ::::BASSIST:::: Progress Not Perfection.

    Sep 2, 2004
    Vancouver, BC Canada
    I have a UL115 and really like the tone. However, if I swapped the driver for another Eminence driver (they are eminence right?) would the tone change? I was thinking of buying an Eminence BASSLITE® C2515 4 ohm so I can draw the full power out my LMII.

    I've read that cab companies make small changes to the design of the driver for their cab, but if the changes are small it should sound *pretty close* to the same right?

    Here are the specs for the BASSLITE® C2515:

    SPECIFICATION
    Nominal Basket Diameter 15", 381mm
    Nominal Impedance* 4 ohms
    Power Rating
    Watts 300W
    Music Program 600W
    Resonance 38Hz
    Usable Frequency Range 52Hz-2.5kHz
    Sensitivity*** 98
    Magnet Weight 7 oz.
    Gap Height 0.28", 7mm
    Voice Coil Diameter 2.5", 63.5mm

    THIELE & SMALL PARAMETERS
    Resonant Frequency (fs) 38Hz
    Download PDF Spec Sheet





    DC Resistance (Re) 3.72
    Coil Inductance (Le) 0.39mH
    Mechanical Q (Qms) 4.7
    Electromagnetic Q (Qes) 0.50
    Total Q (Qts) 0.45
    Compliance Equivalent Volume (Vas) 260 liters / 9.2 cu.ft.
    Peak Diaphragm Displacement Volume (Vd) 381cc
    Mechanical Compliance of Suspension (Cms) 0.26mm/N
    BL Product (BL) 11.1 T-M
    Diaphram Mass inc. Airload (Mms) 70 grams
    Efficiency Bandwidth Product (EBP) 76
    Maximum Linear Excursion (Xmax) 4.5mm
    Surface Area of Cone (Sd) 856 cm2
    Maximum Mechanical Limit (Xlim) 8.5mm
     
  2. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    Probably a waste of time and money. The 2515 is displacement limited to about 150 watts, and if its specs aren't compatable with the cab it will sound worse than what's in there now.
     
  3. tallboybass

    tallboybass Supporting Member

    Feb 25, 2003
    Tulsa, Oklahoma
    If that's a Series One it's a B&C driver.
     
  4. 62bass

    62bass

    Apr 3, 2005
    You won't get any more than a 3 db increase in actual sound if you do that. 3 db is barely noticeable. That's assuming the Eminence 4 ohm you put in there actually works as well as the Eminence Epifani has made for them. Then, who knows if the 4 ohm Eminence is as efficient?

    If you want to get a noticeable and worthwhile increase in volume and utilize the full power of your amp, get an extension cabinet.
     
  5. tallboybass

    tallboybass Supporting Member

    Feb 25, 2003
    Tulsa, Oklahoma
    I did a similar swap a while ago with an Avatar 212 cab. Went from 8 to 4 ohms and I really felt the difference although I was using a GK 800RB at the time. The amp output went from 200 to 300 watts but it felt like more to me.
     
  6. ::::BASSIST::::

    ::::BASSIST:::: Progress Not Perfection.

    Sep 2, 2004
    Vancouver, BC Canada
    Thanks for responding Bill.

    Do you have any suggestions for a 4 ohm neo driver for the UL115?

    How about this one?

    B&C 15NDL76

    SPECIFICATIONS

    Nominal Basket Diameter
    15" / 319mm

    Impedance
    4 or 8 ohms

    RMS Power Rating
    500 Watts
    Program Power 1,000 Watts

    Frequency Response
    40Hz - 2.0kHz

    Sensitivity (1W/1m)
    99.5dB

    Voice Coil Diameter
    3" / 76mm
    Winding Material Copper
    Former Material Fiberglass
    Winding Depth .75" / 17.5mm
    Magnetic Gap Depth .4" / 10.5mm
    Flux Density 1.25T

    THIELE-SMALL PARAMETERS

    Resonant Frequency (fs) 37 Hz
    Impedance (Re) 5.3 ohms
    Electrical Factor (Qes) .24
    Mechanical Q (Qms) 4.5
    Total Q (Qts) .22
    Compliance Equiv. Vol. (Vas) 195 Liters/6.8cu. ft.
    Surface Area of Cone (Sd)m2 0.0855m2
    Voice Coil Overhang (Xmax) 7.0mm
    Reference Efficiency 4.1%
    Diaphragm Mass (Mms) 96g
    BL Factor 22.5 T-M
    Coil Inductance (Le) 1.5mH
     
  7. ::::BASSIST::::

    ::::BASSIST:::: Progress Not Perfection.

    Sep 2, 2004
    Vancouver, BC Canada
    Yes, its Series one. So I guess its a B&C. Cool... the other driver I was think of is a B&C: B&C 15NDL76
     
  8. ::::BASSIST::::

    ::::BASSIST:::: Progress Not Perfection.

    Sep 2, 2004
    Vancouver, BC Canada
    Yeah, that's why I am a bit squeamish about doing the swap. However, 300w to 500w is a pretty big leap. I've also read that the LMII sounds better with 500w (Kjung). At the very least going to 4 ohm would give me more headroom.
     
  9. CrackBass

    CrackBass

    Aug 10, 2004
    huntsville,AL
    4 ohm 15's that are any good are pretty rare, 8 ohm is the standard for most pro drivers in general. if you don't match the specs of the speaker to your cab it will sound worse. plus your existing speaker might be more efficient than a 4 ohm replacement. (might not, but if you don't know what you have now...) you might get more sound with 300 watts at 8 ohms than 600 watts at 4 ohms.

    that's a lot of mights. you would be much better off with 2 15's if you want more volume than doubling the power on one. two modestly priced 15's will best most any expensive single 15 with the same amp (< 500 watts or so) generally.
     
  10. tallboybass

    tallboybass Supporting Member

    Feb 25, 2003
    Tulsa, Oklahoma
    If you're absolutely sure you won't want to add a second cab it could be worthwhile. Lots of homework to be done to insure you're not moving backward though. :) When push comes to shove you'll feel that extra headroom if you do it right. (IMO)
     
  11. alexclaber

    alexclaber Commercial User

    Jun 19, 2001
    Brighton, UK
    Director - Barefaced Ltd
    Forget it, whatever speaker you can find is unlikely to be able to make use of the extra power.

    Alex
     
  12. ::::BASSIST::::

    ::::BASSIST:::: Progress Not Perfection.

    Sep 2, 2004
    Vancouver, BC Canada
    Darn it!
     
  13. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    One can't recommend any driver without knowing the precise cabinet dimensions, and one can't know if it will be an improvement over the existing driver without knowing the specs of the existing driver. In any event the most additional output you might get based on halving the impedance is 3dB, which is not worth the effort unless your amp is incapable of driving the existing driver to full output, which in your case is highly unlikely.
     
  14. ::::BASSIST::::

    ::::BASSIST:::: Progress Not Perfection.

    Sep 2, 2004
    Vancouver, BC Canada
    Thanks Bill. Much appreciated. I'll just keep it as is.
     

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