Model Information

[Tranquility Bass]

 DAL Aletha/Corinthian I
     
      ALETHA:
     
     
     
     
      Designing an efficient, "pulse-coherent" loudspeaker that exhibits a near ruler flat frequency response, near perfect impulse response and step response, as well as having exemplary bass response has traditionally required a sealed enclosure with a very large internal volume. Design alternatives for shrinking enclosure size without suffering a significant loss in efficiency, have utilized ports, vents or other devices which have resulted in higher levels of distortion and unnatural bass reproduction.
     
      Thus, while some alternative design approaches have permitted an extension in low bass response from relatively small enclosures, they have, more often than not, compromised the overall accuracy and quality of the sound.
     
      However, recent research at Dunlavy Audio Labs has made possible the design of the Aletha. A moderately sized loudspeaker with an elegant, artistic appearance that has a high SPL rating (approximately 91 dB), and the capability to reproduce, with astonishing accuracy, lower octave bass information.
     
      This remarkable achievement was accomplished by matching the relevant properties of a 10" woofer with the acoustical properties of a well-damped, sealed enclosure. An SPL increase of nearly 3 dB at low bass frequencies was obtained by taking advantage of the "mirror-imaging" enhancements available with a downward firing woofer radiating through a circular slot aperture just above the floor level. Although downward firing woofers have been tried before, Dunlavy Audio Labs believes that the Aletha is the first loudspeaker to make full and effective use of this design.
     
      Further, the hexagonal shape of the Aletha yields virtually diffraction free performance, with an optimally wide, symmetrical radiation pattern in both vertical and horizontal planes above approximately 80 Hz. Below this frequency, the radiation becomes essentially omni-directional, which fills the listening room with bass energy that can be felt as well as heard.
     
      The Aletha represents a new concept in loudspeaker design where performance, aesthetics, and price/value have come together to create one of the truly remarkable high end audio loudspeakers of all time.
     
      CORINTHIAN I:
     
     
     
     
      Possessing the attractive shape and appearance of a short classical Greek column (including vertical "flutes" along its sides), the Corinthian I (TM) is elegantly finished to resemble beautiful marble, making it a visually welcome addition to almost any listening room.
     
      Equally important, the Corinthian I (TM) (like DAL's larger Corinthian II (TM)) is an extremely accurate loudspeaker, both measurably and audibly. Its well-documented accuracy is achieved by means of a symmetrical, vertical, "time-aligned" array of mid-twt-mid drivers covering the important range above about 300 Hertz (with the tweeter at ear level for seated listeners). This array of drivers is fed by a phase and amplitude corrected crossover network that yields precise reproduction of complex waveforms. A single, down-firing, high-compliance woofer provides full-range, omni-directional, spine tingling bass response down only 4 dB at 20 Hz.
     
      The enclosure's hexagonal shape (nearly cylindrical) yields virtually diffraction-free performance, with optimally-wide, symmetrical radiation patterns in both vertical and horizontal planes, above about 80 Hz. Below this frequency, the loudspeaker becomes essentially omni-directional - filling the listening room with bass energy that can be felt as well as heard. The anechoic-chamber response of the Corinthian I (TM) meets a tight, guaranteed +/- 1 dB spec from 35 Hz to 20 kHz at a distance of 10-ft. (on-axis/anechoically). And, with a sensitivity rating of 90 dB (re: 1 meter on-axis), almost any high-quality audiophile amplifier, with a power rating exceeding 40 watts, will be adequate to drive the Corinthian I (TM) to a very loud 106 dB SPL on peaks.
     
      Imagine - all of this from a loudspeaker with an unusually attractive, CLASSICAL appearance and outstanding "build-quality" - at a suggested retail price low enough to comfortably accommodate most budgets. Indeed, DAL sincerely believes the Corinthian I (TM) to be without peer with respect to quality and performance among loudspeakers of comparable size and price.
     
      So! If you have been waiting for a visually elegant loudspeaker with virtually flawless, full-range reproduction and an affordable price tag, you owe it to yourself to audition the Corinthian I (TM) at your favorite DAL dealer.
     
      "Corinthian" and "Aletha" are Registered Trademarks of Dunlavy Audio Labs, Inc.
     
     
       

AMPLITUDE/FREQUENCY RESPONSE:	35 Hz to 20 kHz, +/- 1 dB, -4 dB @ 20 Hz (anechoic).
EFFICIENCY:	Approximately 90 dB SPL (ref: 1 meter, on-axis) for an input level of 2.83 Volts RMS
IMPEDANCE:	Nominal 4 ohms (min.=3 ohms; max.=7 ohms)
PULSE-COHERENCE:	Impulse response is equal to or better than most top-of-the-line CD players and Digital Processors (at 10 ft. on-axis)
RADIATION PATTERNS:	Precisely symmetrical in both horizontal and vertical planes above about 80 Hz
DIFFRACTION DISTORTION:	Virtually eliminated by the use of efficient sound-absorbing material on all relevant surfaces. (US Patent #4,167,985)
DRIVERS:	-One 10" woofer (cast basket, high damping rubber surround, carbon fiber cone)                 -Two 6.5" Mid-Bass (cast basket, high damping rubber surround)                 -One 1" composite textile dome tweeter.
CROSSOVER AND INTERNAL WIRING:	First order design. Biwire, biamp capability. High voltage, metal film capacitors. Precision machined wound, heavy gauge, high purity copper coils. CAD designed Mil spec fiberglass PC boards utilizing high purity copper traces. Internal wiring via individually isolated ultra pure, proprietary copper cables.
RECOMMENDED AMPLIFIER POWER:	Recommended minimum of 60 watts into 8 Ohms.
RECOMMENDED LISTENING DISTANCE AND ROOM SIZE:	8 to 12 feet, on axis, in a room not smaller than about 15 feet by 20 feet.

     
     
     
       

SIZE:	52" (1320mm)H x 14" (356mm)W x 14" (356mm)D
WEIGHT:	105 lb (48 kg) each
MATERIAL:	3/4" MDF, hardwood corners, architectural hardwood veneers
ALETHA FINISH:	Standard: light or black Oak.                 Optional: Rosewood, Cherry or Natural Cherry.
CORINTHIAN I                 FINISH:	A simulated, "White Marble" finish is hand applied to closely resemble real "white/gray" marble
GRILL:	Frame: Acoustically transparent, precision machined steel frame.                 Cloth: Acoustically transparent black weave

     
     
      Frequency Response
       
       
     
     
     
     
      Impulse Response
       
       
     
     
     
     
      Step Response
       
       
     
     
     
     
      Impedance