12" Silverbird 12

12" Silverbird 12

General Characteristics
Nominal Overall Diameter 307 mm 12 in
Nominal Voice Coil Diameter 38 mm 1.5 in
Magnet Weight 810 g 29 oz
Overall Weight 3.3 kg 7.28 lbs
Flux Density 1.3 T
Voice Coil Winding Depth 10 mm 0.39 in
Magnetic Gap Depth 6 mm 0.24 in
Thiele-Small Parameters
Nominal Impedance
Voice Coil DC Resistance RE 6 Ω
Resonance Frequency ƒS 87 Hz
Mechanical Q Factor QMS 11.79
Electrical Q Factor QES 1.13
Total Q Factor QTS 1.03
Mechanical Moving Mass MMS 28.4 g
Mechanical Compliance CMS 118 µm/N
Force Factor BxL 9.09 Wb/m
Equivalent Acoustic Volume VAS 40.3 lt.
Diaphragm Area SD 490.9 cm2
Voice Coil Inductance @ 1kHz LE 0.57 mH
Constructive Characteristics
Magnet Ferrite
Voice Coil Winding Aluminum
Voice Coil Former Kapton
Cone Material Paper
Surround Material Integrated Paper
Dust Dome Material Non-treated Cloth
Basket Material Pressed Sheet Steel
Surround Treatment Yes
Electrical Characteristics
Nominal Impedance
Rated Power 70 W
Musical Power 140 W
Sensitivity@1W,1m 97 dB
70 watts
Available in 8Ω

The Silverbird speakers are designed to provide an eminently versatile array of tones, retaining the distinct vintage character of their Reinforced AlNiCo ancestors, the Blackbird 40 speakers, but in a more affordable platform. Specific attention was paid to the top-end response, carefully tailored to make the Silverbird speakers well-suited to overdrive and high-gain applications. Additionally, they feature a more contemporary frequency curve on their respective treble ranges.

The Silverbird line utilizes a new 1 ½” (38mm) aluminum-wound voice coil with a Kapton former, designed to retain the trademark clarity of the Jensen clean tones, paired with a smooth, progressive contour of the top-end response; this response is tailored to grant openness with clean and pushed tones, and the necessary smoothness to keep the upper harmonics of the high-gain tones under control. The medium-sized Ceramic magnets provide the necessary strength for generous-yet-tight bass, while the new cone membranes, with a specific treatment on the paper surrounds, deliver a balanced response in the midrange and “presence” zone.

The Silverbird 12 has a fatter and fuller sound. Versatile enough to deliver an open, airy response in open-back cabinets, the Silverbird 12 can morph into powerful rock’n roll tone machines in closed-back enclosures.

Guitarist Description
With a voicing inspired from the Blackbird 12/40 tone, the Silverbird 12/70 retains the present detailed top-end, which is so important for a good clean tone, paired with a clear, expressive midrange. Its robust, warm low-end is a solid foundation for an overall balanced, powerful tone with higher gain applications.
Sound Samples
Want a more in-depth demonstration of our speakers? Try our Jensen speaker demonstration.
Having trouble playing our sound samples? Access the files directly.
Specification Sheet
Product Dimensions
Note: all dimensions are in mm.