SB Acoustics GEMA Bookshelf Speaker Kit

The SB Acoustics Gema is a large 3-way speaker kit that pays homage to the classic speakers of the 1970s, offering a retro-styled design with modern acoustic performance.

Impedance (Z)
Woofer 8 Ω, Midrange 4 Ω, Tweeter 4 Ω
Power Handling (RMS)
Woofer 200 Watts, Midrange 50 Watts, Tweeter 120 Watts
Resonant Frequency (Fs)
Woofer 22 Hz Midrange 63.5 Hz. Tweeter 750 Hz.

€2,799.95

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SKU: GEMA Categories: ,
Description

Highlights of the SB Acoustics GEMA Bookshelf Speaker Kit

  • 12″ SB34NRXL75-8 woofer delivers deep, well-controlled, and tuneful bass.
  • 4″ SB12MNRX2-25-4 paper cone midrange ensures excellent midrange clarity.
  • 1″ SB26STAC-C000-4 soft dome tweeter provides articulate and open high-frequency reproduction.
  • Cabinets & Crossovers included
  • Well-braced cabinet design with a large front slot port tuned to 28 Hz for optimal bass reflex.

 

Product details SB Acoustics GEMA Bookshelf Speaker Kit

SB Acoustics Gema 3-Way Speaker Kit

 

The SB Acoustics Gema is a meticulously engineered 3-way speaker kit that combines a 12″ woofer, 4″ midrange, and 1″ tweeter to deliver a full-range audio experience reminiscent of classic 1970s speakers. The cabinet is designed with generous proportions and a large front slot port, enhancing bass performance and overall sound quality. As an open-source kit, the Gema is fully developed and documented by SB Acoustics, allowing DIY enthusiasts the freedom to build and customize their own high-fidelity speakers using the provided plans and specifications.

Specifications

Article numberGEMA
EAN9508233652252
Woofer SeriesWoofer and Midrange NRX-serie, Tweeter Soft TW
Nominal DiameterWoofer 12" Midrange 4" Tweeter 1"
Power Handling (RMS)Woofer 200 Watts, Midrange 50 Watts, Tweeter 120 Watts
Impedance (Z)Woofer 8 Ω, Midrange 4 Ω, Tweeter 4 Ω
Sensitivity (SPL at 1m / 2.83V)Woofer 91 dB, Midrange 90.5 dB, Tweeter 91.5 dB
Voice Coil DiameterWoofer 75.6 mm, Midrange 25.4 mm, Tweeter 25.4 mm
DC Resistance (Re)Woofer 6.2 Ω, Midrange 3.2 Ω, Tweeter 3.2 Ω
Voice Coil Inductance (Le)Woofer 1.2 mH, Midrange 0.15 mH, Tweeter 0.04 mH
Resonant Frequency (Fs)Woofer 22 Hz Midrange 63.5 Hz. Tweeter 750 Hz.
Mechanical Q (Qms)Woofer 5.5, Midrange 4.19, Tweeter 3.0
Electromagnetic Q (Qes)Woofer 1.78, Midrange 0.35, Tweeter 1.78
Surface Area of Cone (Sd)Woofer 508 cm², Misrange 50 cm², Tweeter 6.2 cm²
Compliance Equivalent Volume (Vas)Woofer 205 liters, Midrange 5.3 Liters
Maximum Linear Excursion (Xmax)Woofer 20 mm (p-p), Midrange 4.4 mm (p-p), Tweeter 1.2 mm (p-p)
Overall Outside DiameterWoofer 346.2 mm, Midrange 123 mm, Tweeter 100 mm
Overall DepthWoofer 159 mm, Midrange 70.1 mm, Tweeter 39.7 mm
Baffle Cutout DiameterWoofer 305.2 mm, Midrange 98.2 mm, Tweeter 82.5 mm
# Mounting HolesWoofer 8, Midrange 4, Tweeter 4
Mounting Hole DiameterWoofer 5.5 mm, Midrange 4.3 mm, Tweeter 4 mm
Article numberGEMA
EAN9508233652252
Additional information
Woofer SeriesWoofer and Midrange NRX-serie, Tweeter Soft TW
Nominal DiameterWoofer 12″ Midrange 4″ Tweeter 1″
Power Handling (RMS)Woofer 200 Watts, Midrange 50 Watts, Tweeter 120 Watts
Impedance (Z)Woofer 8 Ω, Midrange 4 Ω, Tweeter 4 Ω
Sensitivity (SPL at 1m / 2.83V)Woofer 91 dB, Midrange 90.5 dB, Tweeter 91.5 dB
Voice Coil DiameterWoofer 75.6 mm, Midrange 25.4 mm, Tweeter 25.4 mm
DC Resistance (Re)Woofer 6.2 Ω, Midrange 3.2 Ω, Tweeter 3.2 Ω
Voice Coil Inductance (Le)Woofer 1.2 mH, Midrange 0.15 mH, Tweeter 0.04 mH
Resonant Frequency (Fs)Woofer 22 Hz Midrange 63.5 Hz. Tweeter 750 Hz.
Mechanical Q (Qms)Woofer 5.5, Midrange 4.19, Tweeter 3.0
Electromagnetic Q (Qes)Woofer 1.78, Midrange 0.35, Tweeter 1.78
Surface Area of Cone (Sd)Woofer 508 cm², Misrange 50 cm², Tweeter 6.2 cm²
Compliance Equivalent Volume (Vas)Woofer 205 liters, Midrange 5.3 Liters
Maximum Linear Excursion (Xmax)Woofer 20 mm (p-p), Midrange 4.4 mm (p-p), Tweeter 1.2 mm (p-p)
Overall Outside DiameterWoofer 346.2 mm, Midrange 123 mm, Tweeter 100 mm
Overall DepthWoofer 159 mm, Midrange 70.1 mm, Tweeter 39.7 mm
Baffle Cutout DiameterWoofer 305.2 mm, Midrange 98.2 mm, Tweeter 82.5 mm
# Mounting HolesWoofer 8, Midrange 4, Tweeter 4
Mounting Hole DiameterWoofer 5.5 mm, Midrange 4.3 mm, Tweeter 4 mm
Shipping & Delivery
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