This 12 in. Delta Series speaker is ideal for sound reinforcement systems. It is also suitable for lead and bass guitar, keyboards, guitar combos, club music systems, and stage monitors.
Features
Kapton coil former
Ferrite magnet
Pressed steel basket
Polyamide-imide coated aluminum voice coil
Paper cone/cloth cone edge
Solid composition felt dust cap
Technical Info
Nominal Basket Diameter: 12 in., 304.8mm
Impedance: 8 or 16 ohm
Power Rating: 400W rms
Music Program: 800W
Resonance: 55Hz
Usable Frequency Range: 55Hz to 5Khz
Average Sensitivity: 1W @ 1m 100 dB
Magnet Weight: 56oz.
Gap Height: 0.375 in., 9.52mm
Voice Coil Diameter: 2.5 in., 63.5mm
Mounting Information
Overall Diameter: 12.02 in., 305.2mm
Baffle Hole Diameter: 10.97 in., 278.6mm
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.: 11.59 in., 294.3mm
Depth: 5.35 in., 136mm
Net Weight: 11.4 lbs., 5.2 kg
Shipping Weight: 13.5 lbs., 6.1 kg
Thiele-Small Parameters
Resonant Frequency: 55Hz
Impedance (RE): 6.3 ohm
Coil Inductance (Le): 0.74mH
Electromagnetic Q (Qes): 0.46
Mechanical Q (Qms): 5.27
Total Q (Qts): 0.43
Compliance Equivalent Volume (Vas): 81.3 liters/2.87 cu.ft
Peak Diaphragm Displacement Volume (Vd): 82cc
Mechanical Compliance of suspension (Cms): 0.21mm/N
BL Product (BL): 13.5 T-M
Diaphragm Mass inc. Airload (Mms): 39 grams
Equiv. Resistance of mechanical suspension loss (Rms): 2.55N*sec/M
Efficiency Bandwidth Product (EBP): 119
Voice Coil Overhang (Xmax): 1.6mm
Surface Area of Cone (Sd): 519.5cm2
Impedance at Resonance (Zmax): 78 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. 
