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Excel Premium

Magnesium Cone Woofers with Copper Phase Plugs2

SEAS# Type PDF Size Woofer
Description
Ω Fs
Hz
Qts Vas
Liters
X-max
mm
Peak
VC
Ø
mm
Power
Watts
Sens.
1W/
1Mdb
E0021 W12CY-001  PDF 4.5" Magnesium cone, copper phase plug 8 46 .32 5.8 3 26 70 85.0
E0037 W15CH-001  PDF 5.0" Magnesium cone, copper phase plug, NIB magnet 1 8 41 .45 12.0 4 26 70 85.0
E0015 W15CY-001  PDF 5.5" Magnesium cone, copper phase plug 8 37 .34 13.5 4 26 70 86.0
E0049-04 W16NX-001  PDF 6.0" Magnesium cone, copper phase plug 4 37 .33 15.0 7 39 80 85.5
E0049-08 W16NX-001  PDF 6.0" Magnesium cone, copper phase plug 8 39 .35 14.0 7 39 80 88.0
E0018 W18E-001  PDF 7.0" Magnesium cone, copper phase plug 8 31 .34 37.0 5 39 100 86.5
E0027 W18E-001/TV - 7.0" Version of W18E-001, SHIELDED 8 29 .29 56.0 5 39 100 87.5
E0017 W18EX-001 - 7.0" Version of W18E-001, LARGER 8 31 .24 37.0 5 39 100 88.0
E0022 W22EX-001  PDF 8.0" Magnesium cone, copper phase plug 8 27 .34 75.0 5 39 120 90.0
E0026 W26FX-001  PDF 10.0" Aluminum alloy cone, copper phase plug 8 20 .35 161.0 7 51 150 87.0
  1. A neodymium magnet or NIB magnet is a powerful magnet made of a combination of neodymium, iron, and boron (Nd2Fe14B).
  2. Due to new environmental rules in Europe, SEAS can no longer copper-plate the back plate of the Excel woofers. These woofers will be switched over to a rubber boot, like the Nextel speakers.

Interpretting the PDF Data Sheets

Below, you will find some additional technical information that explains how SEAS performs their loudspeaker measurements. Power data specifications conform to IEC rule 168-5. The signal is white noise, shaped to a defined spectrum, and amplitude limited so that the peak voltage is two times the RMS voltage.

The short term maximum power is specified as the maximum noise power which the drive units can take without permanent damage for sixty cycles consisting of one second ON and one minute OFF.

The long term maximum power is defined as above but with ten cycles consisting of one minute ON and two minutes OFF. The mounting conditions in the above tests and during the sound pressure frequency response measurement are identical. Voice coil inductance is a controversial topic with no set standard for measurement. Loudspeaker impedance cannot be represented by a simple inductor at higher frequencies. We calculate the inductance value at the frequency where the impedance has risen 3 dB from its minimum above the resonance frequency.

Resonance frequency( fs ) is measured in the SEAS lab with a sine wave signal at 2Vrms across the driver terminals. There is no established industry standard signal level for measuring fs. For this reason, differing power levels and measurement methods may give significantly different fs, and consequently different values for all other parameters dependent upon fs. Suspension compliance (Cms) (the inverse of the suspension stiffness or spring constant) is related to the moving mass Mms and the resonance frequency fs by the equation: ( 2 π fs) ² . Mms . Cms = 1

Linear coil travel is specified as the total peak-to-peak distance the coil/cone can move with no significant change in the force factor.

Maximum coil travel is specified as the total peak-to-peak distance the coil/cone can move without experiencing gross mechanical non-linearities and limitations

SEAS website
http://www.seas.no

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