Ground Zero GZCM 6.5N-PROC 6.5" Carbon Midrange Speaker | 4Ω

COMPETITION PRO HIGH-OUTPUT MIDRANGE Ground Zero GZCM 6.5N-PROC 6.5" Carbon Midrange Speaker (Single) The Ground Zero GZCM 6.5N-PROC is a high-power 6.5-inch midrange loudspeaker developed for high-SPL motorcycle and automotive audio systems. Its carbon-fiber cone, high-efficiency neodymium motor and rigid aluminum cast basket deliver strong vocal and upper-midrange projection from a compact installation footprint. This 4-ohm Competition Pro driver handles 200 watts RMS, produces 94dB efficiency and covers a published frequency range of 150Hz–12kHz. It is sold individually for custom fairing, lower, speaker-pod and multi-driver system configurations. View Specifications Check Installation Requirements Competition Pro Performance 6.5-inch high-power midrange loudspeaker Competition Pro product series 4-ohm nominal impedance 200 watts RMS power handling 400 watts maximum power handling 94dB published efficiency 150Hz–12kHz frequency response Carbon-fiber cone High-efficiency neodymium motor 38mm CCAW voice coil Massive aluminum cast basket Sold as one speaker GZCM 6.5N-PROC Speaker Overview The GZCM 6.5N-PROC is a dedicated high-power midrange speaker designed to reproduce the vocal, guitar and upper-midrange frequencies that give an open-air motorcycle audio system its clarity and projection. Ground Zero combines a lightweight carbon-fiber cone with a compact neodymium motor and 38mm copper-clad aluminum voice coil. This construction helps the driver produce high acoustic output without the weight of a conventional large ferrite motor. A rigid aluminum cast basket supports the moving assembly and helps maintain alignment during high-output operation. The wave-shaped textile surround controls cone movement while the push terminals provide secure, serviceable speaker-wire connections. Sold individually: This listing includes one GZCM 6.5N-PROC speaker. Order a quantity of two when building a standard left-and-right speaker pair. Why Riders Choose This Competition Pro Midrange High-SPL Midrange Output The driver is engineered for systems where vocals and instruments must remain clear through wind, engine, exhaust and road noise. Carbon-Fiber Cone The lightweight, rigid carbon-fiber cone supports fast response and controlled movement at elevated output levels. Neodymium Motor The compact high-efficiency neodymium motor reduces unnecessary speaker weight while providing strong magnetic control. 200W RMS Power Handling The GZCM 6.5N-PROC is rated for 200 watts RMS and 400 watts maximum when installed, filtered and powered correctly. 94dB Efficiency High published efficiency helps convert amplifier power into strong acoustic output for open-air listening environments. Rigid Cast Basket The massive aluminum cast frame provides a stable mounting platform for demanding custom motorcycle and automotive installations. Dedicated Midrange Speaker Design Midrange Frequency Coverage The published 150Hz–12kHz operating range covers vocals, instruments and much of the upper-frequency information required for strong front-stage projection. Not a Coaxial Speaker The GZCM 6.5N-PROC is a dedicated midrange loudspeaker. It does not contain an integrated tweeter or passive full-range crossover. System design required: Use appropriate active high-pass and low-pass filtering. A separate tweeter may be required when the system needs extended high-frequency coverage and controlled dispersion. Speaker Impedance and Amplifier Matching 4Ω Nominal Impedance Each speaker presents a nominal 4-ohm load and can be powered from a compatible amplifier channel configured for that impedance. 200W RMS Rating Amplifier selection and gain structure should be based primarily on the speaker’s 200-watt continuous RMS rating. Clean Amplifier Output Correct gain, crossover and limiter settings are critical to controlling cone movement and preventing thermal or mechanical speaker damage. Single Speaker Load 4Ω nominal Standard Stereo Pair One 4Ω speaker connected to each amplifier channel RMS Power Handling 200 watts per speaker Maximum Power Handling 400 watts per speaker Wiring matters: Do not parallel multiple speakers on one amplifier channel without calculating the final impedance and confirming that the amplifier is stable at the resulting load. Carbon Cone and Neodymium Motor Carbon-Fiber Diaphragm The carbon-fiber cone combines low moving mass with high rigidity, helping the driver maintain controlled response during high-output operation. Efficient Neodymium Assembly The compact neodymium motor provides the magnetic force required for high-efficiency performance without the size and weight of a large conventional ferrite magnet. Competition Pro Mechanical Construction 38mm CCAW Voice Coil The 1.5-inch copper-clad aluminum voice coil balances electrical conductivity, moving mass and thermal capacity. Aluminum Cast Basket The rigid cast frame supports accurate motor and suspension alignment under demanding operating conditions. Wave-Shaped Textile Surround The textile surround controls cone movement while supporting the fast response expected from a dedicated high-output midrange. Push-Terminal Connections Spring-loaded push terminals support secure speaker-wire connection and simplify service or component replacement. Klippel Optimized Ground Zero identifies this driver as Klippel optimized for controlled mechanical and electrical performance. Standard 6.5" Format The 165mm frame uses a 147mm mounting opening, but all mounting dimensions must be verified against the intended motorcycle part. Ground Zero GZCM 6.5N-PROC Specifications Manufacturer Ground Zero Model GZCM 6.5N-PROC Manufacturer Product Number 32328054 Product Series Competition Pro Speaker Type High-power SPL midrange loudspeaker Nominal Diameter 165mm / 6.5 inches Quantity One speaker per package Nominal Impedance 4Ω RMS Power Handling 200 watts Maximum Power Handling 400 watts Efficiency 94dB Frequency Response 150Hz–12kHz Voice Coil 38mm / 1.5-inch CCAW Cone Material Carbon fiber Motor Material Neodymium Basket Massive aluminum cast basket Surround Wave-shaped textile surround Speaker Terminals Push terminals Mounting Cutout 147mm / 5.79 inches Mounting Depth 63mm / 2.48 inches Resonance Frequency 125Hz Total Q 0.45 Qts Equivalent Air Volume 4 liters / 0.14 cubic feet Integrated Tweeter No Protective Grille Included Not listed as included by the manufacturer Mounting Dimensions and Clearance 6.5" Outer Diameter The speaker uses a nominal 165mm outer diameter for standard-size custom speaker locations. 5.79" Mounting Opening The installation requires a published 147mm mounting cutout. Verify the actual opening before modifying a fairing, pod or lower. 2.48" Mounting Depth Confirm at least 63mm of rear clearance plus space for the push terminals, wiring and normal cone ventilation. Motorcycle Fitment and Installation Notes Universal component speaker: The GZCM 6.5N-PROC is not listed as a direct replacement for a specific Harley-Davidson, Indian, Honda or other motorcycle model. Confirm the complete installation dimensions before ordering. Verify a 147mm / 5.79-inch mounting opening. Confirm at least 63mm / 2.48 inches of rear mounting depth. Allow additional clearance for speaker terminals and wiring. Check basket clearance against factory enclosures and mounting rings. Confirm that the cone and surround cannot contact the speaker grille. Use a rigid mounting surface that seals securely around the basket. Use model-specific adapters when the factory bolt pattern differs. Protect the carbon cone and terminals from direct water exposure. Verify amplifier stability at the final connected impedance. Professional installation and system tuning are recommended. Recommended Motorcycle Speaker Locations Custom Fairing Locations Suitable for custom fairing installations with sufficient mounting diameter, basket depth and grille clearance. Lower Fairing Pods Can be used in compatible lower-fairing or custom pod locations that provide a rigid baffle and adequate rear clearance. Custom Speaker Pods The compact neodymium structure makes the driver useful in custom pods where conventional high-output ferrite speakers may be too heavy or deep. Fitment must be measured: These applications describe potential custom locations, not guaranteed bolt-in vehicle fitment. Crossover and DSP Setup The GZCM 6.5N-PROC is a high-output midrange driver rather than a conventional full-range coaxial speaker. Appropriate filtering is required to keep damaging bass frequencies away from the speaker and to integrate it correctly with tweeters, mid-bass drivers or subwoofers. Use active high-pass filtering to control low-frequency excursion. Use low-pass filtering when transitioning to a separate tweeter. Base initial settings on the complete enclosure and system design. Do not select crossover frequencies from speaker size alone. Set amplifier gain with clean measured output. Use DSP limiting when available to protect the speaker from excessive output. Verify acoustic polarity through the intended listening range. Equalize only after gain, crossover and speaker placement are correct. Recheck settings whenever additional drivers or amplifier channels are added. No universal crossover setting: Ground Zero publishes a 150Hz–12kHz frequency response but does not provide one crossover frequency for every installation. Final settings depend on mounting, amplifier power, listening level and the other drivers in the system. Single Speaker Ordering Order One Select a quantity of one when replacing one driver or building a system that requires a single midrange speaker. Order Two Select a quantity of two for a conventional left-and-right motorcycle fairing, lower or speaker-pod installation. Not sold as a pair: Product quantity must be checked before completing the order. Best For High-output motorcycle midrange systems SPL-focused fairing and lower-fairing builds Custom 6.5-inch speaker pods Four-ohm amplifier channels Systems requiring strong vocal and instrument projection Multi-driver systems using separate tweeters and bass drivers Installations where compact neodymium motors reduce weight Professional custom motorcycle audio builds Related Motorcycle Audio Categories Speakers and Amplifiers Shop Motorcycle Speakers Motorcycle Amplifiers Motorcycle Amplifier Parts System Integration Motorcycle DSP and Signal Integration 2023.5+ / 2024+ Harley Plug-and-Play Kits Shop Cicada Audio Installation Support Motorcycle Audio Installation in Taylors, SC Request a Custom Audio Build Motorcycle Audio Batteries Ground Zero GZCM 6.5N-PROC FAQ Is the GZCM 6.5N-PROC sold as a pair? No. Ground Zero packages this model as one speaker. Order two for a standard left-and-right pair. What impedance is the speaker? The GZCM 6.5N-PROC has a nominal impedance of 4 ohms. How much power can it handle? The speaker is rated for 200 watts RMS and 400 watts maximum. What is the published efficiency? Ground Zero publishes an efficiency rating of 94dB. What is the frequency response? The published frequency response is 150Hz–12kHz. Does this speaker include a tweeter? No. It is a dedicated midrange loudspeaker and does not contain an integrated coaxial tweeter. What type of cone does it use? The speaker uses a carbon-fiber cone. What type of magnet does it use? It uses a high-efficiency neodymium motor. What is the voice-coil size? The current Ground Zero product information specifies a 38mm, or 1.5-inch, CCAW voice coil. What is the mounting depth? The published mounting depth is 63mm, or 2.48 inches. What mounting opening is required? The published mounting cutout is 147mm, or 5.79 inches. Will this bolt directly into my motorcycle? It is a universal component speaker rather than a model-specific direct replacement. Mounting diameter, depth, bolt pattern and grille clearance must be verified. Can it be used without a tweeter? It can operate as a dedicated midrange driver, but a separate tweeter may be needed when the system requires extended high-frequency output. Does it require a DSP? A DSP is not mandatory, but one provides more precise crossover, equalization, polarity, delay and output-limiting control. Is a protective grille included? Ground Zero’s current package contents list one speaker and do not list a protective grille as included. Need Help Matching This Ground Zero Midrange? Garage Bagger Stereo can help verify mounting clearance, speaker quantity, 4-ohm amplifier matching, crossover design, wiring and factory or aftermarket signal integration for your motorcycle audio system. Installation Services Request a Custom Build