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The Dayton Audio Signature Series was designed to give DIY speaker designers access to the pinnacle of speaker technology at the value expected from Dayton Audio. Featuring an open aluminum cast frame, anodized aluminum cone and a polyimide former, these drivers can provide extended range with incredibly low distortion. After hours of painstaking engineering and testing with meticulous attention to detail, we at Dayton Audio deem this driver line worthy of the endorsement of even the most critical audiophile.

Key Features

  • Extensive Klippel LMP and LSI testing to optimize Bl symmetry and parameters
  • Indexed cone/surround junction for smooth transition/frequency response
  • Polyimide formers and aluminum shorting sleeve for improved inductance, damping, and frequency response
  • One piece concave black anodized aluminum cone
  • Vented former and elevated spider for improved air flow
  • Open aluminum cast frame for improved heat dissipation
  • Countersunk stainless steel magnet badging for long time aesthetics
BrandDayton Audio
Part Number295-650
Unit of MeasureEach

Product Specifications

Nominal Diameter4"
Bolt Circle Diameter4.33
Power Handling (RMS)40 Watts
Power Handling (MAX)80 Watts
Frequency Response75-8500Hz
Sensitivity89.7dB 2.83V/1m
Voice Coil Diameter1"

Thiele-Small Parameters

Resonant Frequency (Fs)74.6Hz
DC Resistance (Re)3.7Ω
Voice Coil Inductance (Le)0.22mH
Mechanical Q (Qms)4.84
Electromagnetic Q (Qes)0.47
Total Q (Qts)0.43
Compliance Equivalent Volume (Vas)0.109ft³
Mechanical Compliance of Suspension (Cms)0.68mm/N
BL Product (BL)5T·m
Diaphragm Mass Inc. Airload (Mms)6.7g
Maximum Linear Excursion (Xmax)4mm
Surface Area of Cone (Sd)56.4cm²

Materials of Construction

Cone MaterialAluminum
Surround MaterialRubber
Voice Coil FormerKapton® / Polyimide
Basket / Frame MaterialCast Aluminum

Mounting Information

Overall Outside Diameter4.84"
Baffle Cutout Diameter3.74"
# Mounting Holes6

Recommended Enclosure Volume

Sealed Volume0.05ft³
Sealed F3130Hz
Vented Volume0.148ft³
Vented F368.9Hz

Dayton Audio SIG120-4 4” Signature Series Extended Range 40W Driver 4 Ohm

SKU: SIG120-4
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