The Audiofrog GB40 is widely regarded as one of the best 4-inch (100 mm) midrange drivers for Sound Quality (SQ) car audio systems. It is designed to reproduce vocals and midrange instruments with exceptional clarity and realism rather than producing bass.

Specifications
Size: 4" (100 mm)
Impedance: 4 Ω
Power handling: 100 W RMS, 300 W peak
Sensitivity: 87 dB
Frequency response: 80 Hz – 12 kHz
Mounting depth: 41 mm (very shallow)
Recommended crossover points (active DSP)
Audiofrog recommends approximately:

High-pass filter (HPF): 110 Hz (minimum 12 dB/octave)
Low-pass filter (LPF): 6,000 Hz (minimum 12 dB/octave)
In real-world SQ systems, many tuners run the GB40 between 250–400 Hz and 3–5 kHz, depending on the midbass driver, tweeter, installation, and tuning goals.

Sound characteristics
The GB40 is known for:

Extremely natural vocals
Excellent detail and resolution
Very low distortion
Smooth, non-fatiguing presentation
Wide dispersion, making it easier to build a stable soundstage
Slightly warm tonal balance thanks to its treated paper cone
It is not designed for maximum output. Instead, it excels at realism, imaging, and tonal accuracy.

Typical applications
The GB40 is commonly installed:

In A-pillars
In dashboard pods
In kick panels (less common)
It is frequently paired with:

6.5"–8" midbass drivers
1" tweeters
A DSP for active crossover, time alignment, and EQ
Among SQ enthusiasts, the Audiofrog GB40 is considered a reference-level midrange driver and is often used in high-end competition systems, including vehicles competing in organizations such as EMMA and IASCA.

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