ADS L-620 III High Fidelity Loudspeaker System - 2 Way Speakers
ADS L-620 III High Fidelity Loudspeaker System - 2 Way Speakers - Fully tested and ready to go. While the seeming 2 way acoustic suspension design has been executed many ways, ADS took extreme measure to insure optimum performance. This is an exceptional well cared for pair with very minor signs of use.
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For Example:
The Tweeter - The L620 has a ADS 1-inch acoustic suspension soft-dome tweeter, which accounts for their ultra-clean, "airy" high-frequency response. The diameter and precise shape results in high-frequency extension and wide, uniform dispersion. ADS 1-inch tweeters deliver superb high-frequency extension, excellent transient response, extremely low distortion and high efficiency.
The Woofer - The L620s 10-inch diameter woofers feature ADS tapered Stifflite, a relatively thick material formed of air-filled, randomly-oriented pulp fiber. Coupled to each cone are a low-mass high-temperature metal 2 layer voice coil at one end, and a highly flexible and uniform rubber surround, coupled with Barium Ferrite magnets. The result is a driver with low moving mass, high efficiency, and exceptional power handling capability and wide dynamic range.
The Crossover Network - The crossover components are of the finest quality. All critical capacitors, for example, are computer-grade metalized polyester-film. Bass section inductors are extra-heavy-gauge copper wire and special low saturation, low dynamic distortion ferrite cores. All high-frequency inductors are air-core designs. The coils, as a result, are extremely linear over the system's operating range.
Advanced Acoustic Suspension Design - ADS speakers employ the acoustic (air) suspension principle. The L620s are demonstrably more efficient than other acoustic suspension systems of comparable bass performance. This enables the L620 to be driven to startling sound levels with amplifiers as small as 15 watts per channel.
The Enclosure/Grill -The L620 enclosures are precision-constructed from 3/4-inch extra-high-density particle board, which provides the mass, rigidity and acoustical properties necessary to keep sonic coloration to an absolute minimum. They are beautifully finished in select natural walnut. The durable curved metal grille is acoustically transparent, and it eliminates the need for frames and supports.
Tweeter protection - The tweeter is the most likely driver to be damaged by amplifier misbehavior (including clipping and oscillating) or abuse, the L620s have tweeter protection fuses located in special compartments on their rear panels. Spare fuses are included in these compartments for convenience.
Sound Accuracy - Sonic accuracy is often defined as a lack of recognizable character. Since ADS believes that speakers should be transducers rather than sound generators, it should not be surprising that the L620 sound remarkably similar to one another. And you will find this sound exciting and spectacular only if you find live music exciting and spectacular. If these speakers have a sonic "signature" at all , it is their transparent, effortless and neutral sound character, a feature common to all ADS speakers.
L 620 Specifications
- Frequency Response: 30 - 20,000 Hz ±3 dB (20 - 22,000 Hz ±5 dB)
- Impedance: 6 Ω (nominal), 4 Ω (minimum)
- Efficiency: 92 dB SPL with 2,8 V RMS ( 1 watt) pink noise input measured at 1 m in typical listening room (2000 ft²)
- Driver Complement:
- HF : 1" soft dome tweeter
- LF : 10" Stifflite woofer
- Crossover: 1,500 Hz 12 dB/octave
- Power Rating: 75 watts (nominal), 150 watts (max peak program)
- Recommended Amplifier Power: 15 watts (minimum), 150 watts (maximum)
- Cabinet: Walnut / dense particle board
- Baffle: piano black finish
- Grille: Acoustically transparent removable frameless grill in bronze finish.
- Dimensions (Hx W x D): 25-1/2" x 14-1/8" x 11-3/4"
- Weight: 18 kg (40 lbs)