SoundQubed HDX Series Pro Audio Bullet 6.5" Speaker (each)

SoundQubed PA6B-4 — 6.5" Pro Audio Midrange | 300W RMS | 97 dB | Ferrite + Neodymium Hybrid Motor | Sold Single

The SoundQubed PA6B-4 is a purpose-built 6.5" pro audio midrange driver engineered for competition car audio, high-output daily drivers, and any build where maximum output and clarity in the midrange band is the priority. Featuring a non-pressed paper cone, cloth surround, a ferrite + neodymium hybrid magnet system, a 1.5" / 38.6mm CCAW voice coil on a glass fiber former, and an aluminum basket, the PA6B-4 delivers 300W RMS / 600W max at 97 dB sensitivity with a frequency response of 100 Hz–10 kHz. Sold as a single speaker — order the quantity you need for your build.

The PA6B-4’s ferrite + neodymium hybrid motor (30 + 3 oz) combines the high-flux density of neodymium with the thermal mass of ferrite — delivering exceptional sensitivity and sustained high-power performance without thermal compression. The 7.2mm one-way Xmax gives this driver serious linear excursion capability for a 6.5" midrange, allowing it to move real air at high output levels without distortion. With a Qts of 0.556 and Fs of 150 Hz, the PA6B-4 is optimized for use with a high-pass crossover at 160 Hz — keeping it in its optimal operating range and protecting it from low-frequency content that would reduce output and increase distortion.

The non-pressed paper cone delivers a natural, detailed midrange character with low mass for fast transient response — ideal for vocal presence, instrument clarity, and upper-midrange detail in a high-output system. Whether you’re building a competition SPL or SQL system, upgrading a bagger for maximum output, or building a high-efficiency 3-way active front stage, the PA6B-4 is the 6.5" midrange that delivers.

Why Choose the SoundQubed PA6B-4?

• 300W RMS / 600W MAX @ 4Ω — Pro-grade power handling in a 6.5" midrange — built for high-output competition and demo builds.
• 97 dB Sensitivity (1W/1m) — Exceptionally high efficiency — delivers massive output with relatively modest amplification.
• Ferrite + Neodymium Hybrid Motor (30 + 3 oz) — Best of both worlds — neodymium flux density for sensitivity, ferrite thermal mass for sustained high-power performance.
• 7.2mm One-Way Xmax — Serious linear excursion for a 6.5" midrange — moves real air at high output without distortion or mechanical failure.
• 1.5" CCAW Voice Coil on Glass Fiber Former — Lightweight, thermally efficient winding on a rigid former — handles sustained high-power use without thermal compression.
• Non-Pressed Paper Cone — Low-mass, natural-sounding cone material for fast transient response and detailed midrange reproduction.
• Aluminum Basket — Rigid, resonance-free basket construction — pro audio grade in a car audio package.
• Sold Single — Buy exactly what you need — order quantity two for a stereo pair.

Installation & Pairing Recommendations

Crossover Configuration: The PA6B-4 is a dedicated midrange driver — always use a high-pass crossover set at 160 Hz minimum to protect the driver and keep it operating in its optimal range. For competition and high-output builds, use an active crossover or DSP to set precise HPF and LPF crossover points. A band-pass configuration (160 Hz HPF / 8–10 kHz LPF) is recommended for maximum output and driver protection.

Amplifier Pairing: The PA6B-4 handles 300W RMS at 4Ω. Use a dedicated amplifier channel with at least 150–300W RMS at 4Ω for best results. The SoundQubed Q4-2000 (325W x4) or Q4-3200 (520W x4) are excellent matches for a multi-driver pro audio front stage build.

3-Way Active Front Stage: The PA6B-4 pairs naturally with the SoundQubed HDX Series 2.2" Titanium Dome Tweeter (crossed at 3.8 kHz HPF) and a dedicated subwoofer or midbass driver for a complete 3-way active front stage. Use a DSP to manage the crossover points between all three drivers precisely.

Mounting: The PA6B-4 requires a 5.71" / 145mm baffle cutout and 2.89" / 73.5mm mounting depth. Overall diameter is 6.52" / 165.7mm, overall depth is 3.25" / 82.5mm. Motor diameter is 4.72" / 120mm. Verify your mounting location provides adequate depth clearance before purchasing.

Full Specifications

General

Motor Specifications

Thiele & Small Parameters

Speaker Measurements

Frequently Asked Questions

Q: Is the PA6B-4 a full-range speaker or a dedicated midrange?
A: It’s a dedicated pro audio midrange driver — not a full-range speaker. It’s designed to be crossed over at 160 Hz HPF minimum and used with a dedicated tweeter and subwoofer or midbass driver. Always use a high-pass crossover to protect the driver and maximize output.

Q: What’s the difference between the PA6B-4 and the PA69B-4?
A: The PA6B-4 is a 6.5" round midrange (300W RMS, 97 dB, Fs 150 Hz, HPF at 160 Hz) while the PA69B-4 is a 6x9" midrange (350W RMS, 99 dB, Fs 100 Hz, HPF at 100 Hz). The PA69B-4 has a lower Fs and handles more power, making it better suited for locations where a 6x9" footprint is available. The PA6B-4 fits standard 6.5" round locations.

Q: What amplifier should I pair with the PA6B-4?
A: The PA6B-4 handles 300W RMS at 4Ω. The SoundQubed Q4-2000 (325W x4) or Q4-3200 (520W x4) are excellent matches. Use a dedicated amplifier channel per driver with an active crossover or DSP for precise crossover point management.

Q: Is this sold as a pair or single?
A: The PA6B-4 is sold as a single speaker. Order quantity two for a stereo pair.