Audiofrog GB40 4” MID-RANGE Speakers


Audiofrog GB40


Introducing the incredible Audiofrog GB40!

This exceptional midrange driver is specifically designed to enhance your audio experience in your car's door panel or dashboard installations. With its cutting-edge features, the Audiofrog GB40 is optimized for both infinite baffle applications and enclosures of at least 1 litre.

What sets the Audiofrog GB40 apart is its remarkable 41 mm mounting depth, making it a breeze to fit into locations that demand a shallow midrange. No more worrying about space constraints!

But that's not all - the Audiofrog GB40 is part of our prestigious GB Series midrange speakers, ensuring top-notch quality and performance. Included with this gem are a grille and installation kit that can be fully customized to seamlessly blend with or even highlight any installation.

Get ready to be blown away by the Audiofrog GB40's exceptional sound quality and versatility. Upgrade your car audio system today and experience the thrill of music like never before!

Applications and Systems

Active Systems:

  • GB10 and GB25: Perfect for A-pillars, doors or a centre channel
  • GB10 and GB40: Perfect for A-pillars, doors or a centre channel
  • GB10 and GB60: Great two-way system for factory locations
  • GB10, GB25 and GB60: The ultimate active system for A-pillars with door or kick panel-mounted midbass. Great for doors when only a small midrange driver will fit between the midbass and the tweeter.
  • GB10, GB40 and GB60: The ultimate active system for door panel installation. 

Passive Systems with dedicated crossovers:

  • GB10, GB40 and GB410C: Perfect for doors or a centre channel with a passive crossover. The shallow design is great for BMW doors.
  • GB10, GB60 and GB610C: Great for standard OE locations or for kick panels. 

In combination systems with active and passive crossovers:

  • GB10, GB40, GB410C and GB60: The ultimate system for doors when a small tweeter is required using a passive crossover between mid and tweeter and an active crossover between midbass and midrange
  • Treated Paper Cone
  • 1” (25 mm) Voice Coil on Fiberglass Former
  • Milled Flat Single-Layer CCAL Voice Coil
  • Copper Inductance- and Distortion-Reducing Pole Piece Cap
  • Neodymium Motor with Bucking Magnet
  • Flat, Progressive Nomex® Spider
  • Nitrile Butadiene Rubber Surround
  • Proprietary Vented Cast Aluminum Basket
  • Chrome-Plated Cast Zinc Motor Housing
  • Screw Terminals
  • All-Metal Grille and Mounting Kits Included
  • Hex Screws and Tools Included
  • Removable and Paintable Grille
  • Rub-On Grille Logos Included for Custom Installation


  • Nominal Impedance: 4 Ω
  • RMS Power Handling: 100 W (with recommended crossover)
  • Peak Power Handling: 300 W (with recommended crossover)
  • Frequency Response (-3 dB): 80 Hz – 12 kHz
  • Sensitivity (2.83 V/1 M): 87 dB
  • Recommended Amplifier RMS Power Range: 20 W – 100 W
  • Recommended High Pass Filter Frequency and Slope: ≥ 110 Hz, ≥ 12 dB/oct
  • Recommended Low Pass Filter Frequency and Slope: ≤ 6 kHz, ≥ 12 dB/oct


Frequency Response:

Thiele & Small Parameters:

  • Revc: 3 Ω
  • Levc@1kHz: 0.06 mH
  • Sd: 59.4 cm²
  • Mmd: 5.18 g
  • Mms: 5.45 g
  • Cms: 574 µM/N
  • Vas: 2.89 litres
  • Fs: 90 Hz
  • BL: 3.9 TM
  • Qms: 5
  • Qes: 0.62
  • Qts: 0.55
  • Xmax (1-way linear): 4.5 mm (3/16”)
  • Basket Displacement: 0.106 litres (0.004ft³)


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