This 15 in. speaker from the Delta Series excels in all high-power bass applications, including bass guitar.
Features
Kapton coil former
Ferrite magnet
Pressed steel basket
Polyamide-imide coated aluminum voice coil
Paper cone/cloth cone edge
Solid composition paper dust cap
Technical Info
Nominal Basket Diameter: 15 in., 381mm
Impedance: 8 or 16 ohm
Power Rating: 400W rms
Music Program: 800W
Resonance: 40Hz
Usable Frequency Range: 40Hz - 4kHz
Average Sensitivity: 1W @ 1m 101 dB
Magnet Weight: 56oz.
Gap Height: 0.375 in., 9.52mm
Voice Coil Diameter: 2.5 in., 63.5mm
Mounting Information
Overall Diameter: 15.15 in., 384.8mm
Baffle Hole Diameter: 13.77 in., 349.6mm
Front Sealing Gasket: fitted as standard
Rear Sealing Gasket: fitted as standard
Mounting Holes Diameter: 0.25 in., 6.4mm
Mounting Hole B.C.D.: 14.56 in., 369.9mm
Depth: 6.05 in., 153.6mm
Shipping Weight: 14.6 lbs, 6.6 kg
Thiele-Small Parameters
Resonant Frequency: 40Hz
Impedance (RE): 6.9 ohm
Coil Inductance (Le): 0.86mH
Electromagnetic Q (Qes): 0.54
Mechanical Q (Qms): 6.56
Total Q (Qts): 0.49
Compliance Equivalent Volume (Vas): 293 liters/10.4 cu.ft
Peak Diaphragm Displacement Volume (Vd): 231cc
Mechanical Compliance of suspension (Cms): 0.28mm/N
BL Product (BL): 13.6 T-M
Diaphragm Mass inc. Airload (Mms): 55 grams
Equiv. Resistance of mechanical suspension loss (Rms): 2.12N*sec/M
Efficiency Bandwidth Product (EBP): 77
Voice Coil Overhang (Xmax): 2.7mm
Surface Area of Cone (Sd): 856.3cm2
Impedance at Resonance (Zmax): 52 ohm
Important Note
Watts: The guaranteed long term power rating throughout the usable frequency range of the speaker.
(Translation: the speaker will operate continuously at any frequency within the speakers specified frequency range when driven at this power. The "Watts" rating is similar to RMS, but is really more indicative of long term thermal capability.)
Music Program: The speaker will safely and reliably handle the varying frequencies of musical content at this power rating. The "Music Program" rating is more indicative of what you can expect in the real world with the speaker operating within the appropriate enclosure reproducing music or vocal audio program.
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Certain items must be exchanged directly through the manufacturer if they are found to be defective. This includes tubes, strings, pickups, raw frame speakers, drum heads, drumsticks, cymbals, cowbells, and harmonicas. These items can only be returned to us if they are unopened. 
