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Product Details

Description

The JS-1250 12" Signature Guitar Speaker is an Eminence guitar speaker for musicians, builders, and repair technicians seeking a purposeful replacement or new-cabinet driver. Respected as much for his tone as his guitar skills, Josh Smith's concept for the ultimate guitar speaker involved combining the lows of the Eminence Tonespotter, the clean highs of the Wizard, and the natural grit and sparkle of the Red Fang alnico. The result is an extremely versatile speaker with vintage tone and the ability to handle the power of modern amps. Key specifications include 50 W power handling, 8 Ω nominal impedance, 80 Hz - 5.2 kHz usable frequency range, 101.4 dB sensitivity.

Its construction features a ferrite magnet, a 1.75", 44 mm voice coil, supporting reliable performance in compatible cabinets and amplifiers. Use it for amplifier upgrades, custom cabinet projects, tonal experimentation, or restoring a working rig with a speaker selected for its musical response. Before installation, confirm the amplifier's impedance requirement, available mounting depth, cabinet cutout, and power compatibility. For best results, choose an enclosure and amplifier pairing appropriate for the published specifications and the desired playing style.

Characteristics
Filter series
Signature
Model
JS-1250
Characteristics application
12" Open or Closed Back
Configuration
1, 2, or 4 x 12"
Low end response
Aggressive
High end response
Aggressive
Overall coloration
An extremely versatile speaker with vintage tone and the ability to handle the power of modern amps.
Break up modes
Balanced
Characteristics power range

50

Instrument

Lead/Rhythm Guitar

Characteristics genre

Blues
Country
Rock

Specifications
Nominal basket diameter
12", 305mm
Nominal impedance
8 Ω
Power rating watts
50 W
Resonance
92 Hz
Usable frequency range
80 Hz - 5.2 kHz
Sensitivity
101.4 dB
Gap height
0.313", 8 mm
Voice coil diameter
1.75", 44 mm
Thiele & Small Parameters
Resonant frequency fs
92 Hz
Dc resistance re
6.42
Coil inductance le
0.5
Mechanical q qms
15.69
Electromagnetic q qes
0.63
Total q qts
0.61
Compliance equivalent volume vas
41.21 liters, 1.46 cu.ft.
Peak diaphragm displacement volume vd
41 cc
Mechanical compliance of suspension cms
0.11 mm/N
Bl product bl
12.91
Diaphragm mass inc airload mms
28
Efficiency bandwidth product ebp
145
Maximum linear excursion xmax
0.79 mm
Surface area of cone sd
519.5 cm²
Mounting Information
Driver volume displaced
0.071 cu.ft. / 2 liters
Overall diameter
12.17", 309.1 mm
Baffle hole diameter
11.13", 282.7 mm
Front sealing gasket
Yes
Mounting holes diameter
0.24", 6.1mm
Mounting holes b c d
11.75", 298.5mm
Depth
5.23", 132.8 mm
Net weight
8.0 lbs, 3.63 kg
Shipping weight
9.8 lbs, 4.45 kgs
Materials of Construction
Coil construction
Edgewound copper
Voice coil former
Nomex
Magnet material
Ferrite
Basket material
Pressed steel
Surround
Paper
Dust cap composition
Zurette