Features
- 6.5-inch high power subwoofer
- Built-in Class AB high-efficiency power amplifier
- Front-firing design with small footprint
- Single front slot port for optimized bass output
- 12dB/Octave variable low pass filter
- 0–180° phase shift
- Auto/On/Off signal detection circuitry
- Low level (RCA) audio inputs
- Finish: Black Ash
- Removable grille
- Built-in vibration-isolating feet
- Also available in 10-inch and 12-inch models
Specifications
- Power Output: 150W Peak
- Amplifier Class: Class AB
- Frequency Response: 28Hz–180Hz
- Crossover Frequency: 40Hz–180Hz
- Output Level: < 100dB from 25Hz–125Hz
- Includes room gain
- 9.92 in. (252mm) x 7.63 in. (194mm) x 14.21 in. (361mm)
- Weight: 16.5 lb (7.5 kg)
In The Box
- (1) FF6.5 subwoofer
- (1) Removable grille
- (1) Power cable
- (1) Product manual
Power and Precision: The Amplifier and Woofer Symbiosis
The FF6.5’s remarkable performance stems from a carefully orchestrated synergy between its amplifier and woofer, ensuring authoritative and deep bass reproduction. At the heart of the FF6.5 lies a robust, built-in 150-watt power amplifier with Class AB topology, often favored for its optimal balance of sonic fidelity and operational efficiency. This amplifier is not a new invention but rather a refined descendant of the signature Sub-Series from Earthquake, known for its proven, reliable design that has been honed over time.
The Slot Port Advantage: Deeper Bass, Smarter Design
A standout feature and key differentiator for the FF6.5 is its advanced FEA (Finite Element Analysis) computer-modeled quarter-wavelength transmission line with a variable cross-section folded-horn that offers more port volume than traditional tubular ports, resulting in powerful, deep bass that fills a room. Unlike bulky tubular ports, the slot port can bend at optimal angles, allowing for a smaller cabinet size without sacrificing performance or aesthetics. This design also directs airflow across specially shaped internal heat exchangers, enabling the subwoofer to maintain high output without overheating. The cooling system ensures long-term reliability and prevents thermal compression during demanding playback. Additionally, the slot port acts as a cross brace, enhancing the cabinet’s strength and eliminating resonance. This rigid, non-resonant construction minimizes unwanted vibrations, ensuring that the sound produced is clean and pure.
The slot port is more than just an air opening; it represents a comprehensive engineering solution. Its multi-functional design impacts acoustic output, cabinet dimensions, visual appeal, amplifier cooling, and structural integrity. Instead of addressing issues like port noise, cabinet size, or thermal management individually, Earthquake engineers have created a single, integrated feature that tackles these challenges together. This meticulous approach enhances the FF6.5’s remarkable combination of price and performance, making it a product that exceeds the sum of its parts.