ESC
604-8H-III

604-8H-III

BrandGreat Plains Audio, Altec, Altec Lansing
ManufacturerGreat Plains Audio, LLC.
SeriesDuplex
FunctionSpeaker
Produced2009-2016
CountryUnited States
Form FactorPart
Signal PathPassive Hardware
Dimensions40.6 × 40.6 × 22.2 cm (W × H × D)
Weight38lbs
Frequency Response40Hz-20kHz (-10dB)
TrebleExponential Coaxial Horn
Midrange/Bass15" Paper Cone
Impedance (Nominal)8Ω
Crossover Frequency1.5kHz (Great Plains Audio N604-8A)
Crossover SlopeLow Pass: 12dB/Oct, High Pass: 18dB/Oct (Second Order, Third Order)
Dispersion (Horizontal)60°
Dispersion (Vertical)40°
DC Resistance (Re)7.17Ω
Resonant Frequency (Fs, Woofer)33.7Hz
Qts0.26
Qes0.26
Qms11.8
Volume Displacement (Vd)314.6cm³ (19.2in³)
Equivalent Volume Compliance (Vas)329.9l (11.65ft³)
Reference Efficiency (ηo)4.61%
Maximum Linear Excursion (Xmax)0.15"
Effective Surface Area (Sd)825.8cm² (128in²)
Effective Piston Diameter12.77"
Voice Coil Diameter (Treble)1.75"
Voice Coil Diameter (Woofer)3"
Magnet MaterialFerrite
Power Handling (AES)100W
FinishBlack Powder Coat
LinksProduct Page