SB Acoustics Gema 3-Way Speaker Kit - Pair

SB Acoustics Gema 3-Way Speaker Kit - Pair

Flat pack cabinets are available through Speaker Hardware.

Gema is a large 3-way speaker paying homage to the classic speaker of the 1970’s. Generous enclosure proportions fitted with large bass drivers were the bee’s knees at the time. And for good reason!

The Gema is SB's take on a retro-styled speaker, and the much loved 12″ SB34NRXL75-8 lays the foundation of a deep, well controlled and tuneful bassline.

The dedicated midrange is covered from 680Hz and all the way up to 3kHz by the 4″ paper cone SB12MNRX2-25-4 which is characterized by good efficiency, low moving mass and great linearity resulting in excellent midrange clarity.

To perfectly match the articulate and open midrange the top end is handed over to the 1 inch soft dome SB26STAC-c000-4 equipped with die-cast aluminium faceplate, optimised rear chamber and full copper cap.

The well braced cabinet is designed with a large slot port tuned to 28 Hz opening to the front of the speaker and a generous sealed enclosure for the dedicated midrange. We highly recommend building the speakers from high quality 18mm plywood.

A good starting point for the placement of the Gema would be a spacing of 2.5-3 meters between the speakers with generous clearance to any side and rear walls and ideally on a stand or plinth elevating the speaker about 25cm from the floor and tilted back at about 6 degrees and a slight toe in. The tweeter and midrange are intended to be on the outside, but this will depend on the room – as usual, we encourage you to experiment with speaker placement to suit your taste and listening space.

Each Gema Kit Includes:

• (2) SB Acoustics SB26STAC-C000-4 1" Textile Dome Tweeters
• (2) SB Acoustics SB12MNRX2-25-04 4" Paper Cone Midrange
• (2) SB34NRXL75-8 12" Paper Cone 3" Voice Coil Large Magnet Woofers
• (2) Madisound Professionally Assembled Crossovers (see pictures and details below)

Optional Accessories Package Includes:

• (3) Wool Felt sheet 36" x 36" - cut and line internal walls
• (2) Acousta-Stuff lb - fluff & fill enclosure
• (32) Supra Classic 1.6 15awg - tinned oxygen free copper internal speaker wire
• (20) Quick Connects - connect speaker wire to drivers & input cup
• (16) OXSOCKET8x1 screws - mount midrange and tweeter drivers to cabinet
• (16) OXSOCKET10x1.25 screws - mount woofers to cabinet
• (2) TD-CUPS - dual binding post input cup

Specifications:

• Frequency Range: 36 – 24000 Hz
• Sensitivity (2.83V/1m): 87 dB
• Nominal Impedance: 6Ω
• Max SPL: 108 dB
• Recommended Amplifier: 50 – 200 W
• Crossover Frequency: 680/3000 Hz
• Enclosure Type: Bass reflex
• Port tuning Frequency: 28 Hz

Cabinet Info:

• Build to 16-15/16" wide x 28-3/8" tall x 14-3/16" deep (external dimensions using 3/4" material)
• Use 3/4" material (mdf, birch ply, etc.) - keep baffle width at 9" & adjust height &/or depth if using thicker material
• Detailed Cabinet Drawing (PDF)
• Flat pack cabinets are also available here.

Madisound Crossover Info

Each crossover is professionally assembled by Madisound on our silver tinned inlaid OFC copper circuit board. We use two 11" x 5.6" MATRIXDOUBLE boards per channel. 

The series tweeter and midrange caps are ClarityCap CSA line. A small amount of attenuation is added to the tweeter with a Mundorf MOX resistor.

The midrange inductors are Sidewinder 16awg air core, with a polycap in the parallel circuit.

The series woofer inductors are ultra low DCR Sledgehammer Steel Laminate 15 AWG.

A hookup sheet is provided, indicating where to solder the speaker wire for input from the binding posts and output to the drivers.

Upgrade options are available from the drop down menu. 

Madisound Assembled Crossovers



SB Acoustics Drivers in Gema Kit



SB26STAC-C000-4 1" Textile Dome Tweeter



SB12MNRX2-25-04 4" Paper Cone Midrange



SB34NRXL75-8 12" Paper Cone Large Magnet Woofer