Eminence Delta-12LFA Altoparlante PA

Eminence Delta-12LFA — 12" Pro Audio Low-Frequency Driver

The Eminence Delta-12LFA is a 12" American Standard Series low-frequency driver for sound reinforcement, bass guitar combos, club installs, and stage monitors. Extended Xmax geometry pushes more air than standard 12" woofers, anchoring three-way PA cabinets with real low-end at 500 W RMS and 1000 W program power.

Extended Excursion and Thermal Headroom

A 4.8 mm Xmax and 13.5 mm Xlim mechanical limit, paired with a 56 oz ferrite magnet and vented extended pole piece, separate this driver from standard 12" woofers. The 2.5" copper voice coil on a polyimide former absorbs thermal stress during long high-SPL sessions, while a pressed steel basket, paper cone, and cloth accordion surround handle repeated high-power cycles.

Power Handling and Sensitivity

Power handling and sensitivity define how loud a driver can play before compression. The Delta-12LFA combines 94.6 dB sensitivity with 500 W RMS continuous power, so a single driver delivers usable SPL in mid-size venues.

• Power Rating (RMS): 500 W — sustained clean bass without thermal failure
• Program Power: 1000 W — peak headroom for transient bass content
• For efficient amplifier-to-acoustic conversion, the unit offers 94.6 dB sensitivity (2.83 V / 1 m).

Frequency Response and Thiele-Small Parameters

Thiele-Small parameters govern enclosure behavior. This model's parameters suit sealed and vented mid-bass cabinets, with usable response reaching down to 44 Hz.

• Usable Frequency Range: 44 Hz – 3 kHz — sub-bass through lower midrange
• Resonant Frequency (Fs): 51 Hz — low tuning point for extended bass
• Integration into enclosures is guided by a Vas value of 67.9 L (2.4 cu.ft.).

Mounting and Materials

Cabinet builders need precise mounting dimensions. The driver ships with front and rear sealing gaskets and fits standard 12" cutouts, while a pressed steel basket and ferrite magnet keep weight manageable.

• Overall Diameter: 305.6 mm — standard 12" frame footprint
• Baffle Hole Diameter: 281.2 mm — matches common 12" cabinet cutouts
• With a mounting depth of 135.9 mm, it fits most sealed and vented 12" enclosures.