ADS L1590/2, Lacquered-Rosewood Cabinets, SN 5101 & 5102, Original Mint Cond For Sale
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ADS L1590/2, Lacquered-Rosewood Cabinets, SN 5101 & 5102, Original Mint Cond :
$1875.00
ADS L1590/2, Lacquered Rosewood Cabinets, SN 5101 & 5102, OriginalMint Condition
Note: Shipping Charges must be multiplied by two
SN5101
SN5102
ADS1590/2 speaker bases
ADS1590/2 shipping cartons
ADS1590/2 protective dome covers
ADS1590/2 Tower Loudspeaker System Owner\'s Manual
Condition and Performance:
ADS L1590/2 TechnicalDescription:
The L1590 speakers were HiFi GrandPrix award-winning speakers for two years in a row and considered by many to beamong ADS\'s finest efforts.
The first of the \"TowerLoudspeaker\" series L1590s, the \"Series One,\" were introduced inthe mid-1980s. By the late 1980s, ADShad significantly updated the series with improvements to drivers and crossovernetworks. These updates significantly improved thespeaker with regards to power-handling capability, smoothness and lowdistortion. Improvements were made tocrossover networks and driver components themselves. The new series was called the \"Series Two,\"and the L1590 became the L1590/2.
These changes came about as aresult of new computer modeling techniques, such as FFT measurements, thatallowed ADS engineers to enhance product performance and durability. Another reason for the improvement came aboutdue to concerns about reducing coloration and distortion in the midrange area. Since ADS speakers were already criticallyacclaimed for excellent performance in smoothness, off-axis response and lowdistortion, this improvement was further indication that ADS was very seriousabout making state-of-the-art loudspeakers for the consumer high-fidelityindustry.
For the woofer systems in thenew Series 2 versions of the L1590, ADS improved the potent 10-inch woofers byadding 2-inch diameter voice coils with formers made from Kapton (*Kapton is ahigh-temperature, stable polyimide dielectric film material used for criticalaircraft wiring insulation, solderless terminals and other special applicationsrequiring a wide range of heat cycles), an aerospace material unaffected byheat well beyond temperatures found in loudspeakers. Kapton is also more stable than aluminum athigh temperatures and is not affected by magnetic flux during wide excursions. This simple change reduced low-frequencyreproduction coloration and distortion, improved damping and increasedpower-handling capability for this woofer system. This was a subtle butimportant improvement in an already potent low-frequency system in the L1590.
For the 2-inch diameter,fabric-dome midrange driver, Kapton formers were also used in addition toFerrofluid to stabilize and cool the voice coil. This improved transient response and smoothedthe output in the 5kHz region approaching crossover, reducing a 2-3 dB rise atthat frequency in the original series to 0 dB.This increased the smoothness and accuracy of the 2-inch dome driver. The Kapton former further reduced mass, thusimproving efficiency and damping of an already nearly ideal reproducer. ADS dome drivers have always been known fortheir nearly perfect transient-response performance. The actual passband of the 2-inch Kaptonmidrange driver was increased to permit a lower 350 Hz crossover to the woofersection, and to eliminate the 2.5 amp protection fuse used in the Series 1L1590. Crossover transition wassmoother.
The ¾-inch fabric-dome tweeteralso benefitted from the new Series 2 improvements. The 1.5 amp fuse was eliminated and a special,solid-state thermal protection device was incorporated into the crossover. A damping pad was placed under the dome thatboth protected the dome against indentation (fingers) and also improveddamping. Ferrofluid added to the voicecoil also increased damping and power-handling capability, and because of thelowered mass of the improved tweeter, the high-frequency on-axis response wasextended well beyond audible limits (to beyond 28kHz). The tweeter\'s transient response was furtherimproved, improving on the nearly perfect transient response of the originaltweeter. The clarity and smoothness ofthis tweeter was an important reason for the L1590\'s reputation as a superiorsound reproducer.
Crossovers (350 Hz and 5000 Hz) were improved in theSeries 2 versions. Computer-aidedanalysis allowed ADS to improve interaction between the drivers and crossover,resulting in smoother response and lower coloration. Phase response was optimized for flat-baffle systems. Larger-diameter gold-plated binding posts wereadded to allow larger diameter speaker cable (up to 7 gauge). New-generation \"slick-film\"capacitors with lower dielectric absorption, longer life and less heat losswere added along with polyester-film capacitors in the tweeter circuits. Midrange coils were air-core, low-loss typesand woofer chokes were ferrite-bobbin designs rated for 0.02% harmonicdistortion at up to 500 watts input, just prior to saturation. This is steady-state power rating, whereaspeak power inputs go much higher thanthat without saturation. For example, in1984 Julian Hirsch tested the original version L1290 with peak power pulses ofup to 2,500 watts at 10kHz, which was the limit of the testing amplifier,without distress, and up to 1200 watts at 100 Hz into the woofers. These high numbers are significant, but theL1590 has significantly greater power-handling capability than the 1290,particularly in the bass frequencies. With the Series 2 versions, thispower-handling would have been even greater. Therefore, the Series 2 changes weresignificant. Audible differences werecertainly subtle, but when compared side-by-side, improvements could be heardin smoothness and clarity. These werethe last of the butyl-rubber treated fabric-dome midrange and tweeter units,and the last of the \"old\" ADS speakers before the advent of the newera/d/s/ versions of the CM and M speakers. Whether or not the new versions were betterthan the earlier Series 2 speakers has been debated at some length, but interms of measured response smoothness and dispersion and the resultant acousticpower, the Series 2 speakers were probably much superior to the later modelsand certainly among the best loudspeaker ever designed.
Overall Description covered by
©Tom Tyson 1999-2016 USCO All RightsReserved
On Dec-01-16 at 08:58:11 PST, seller added the following information:Notes:
- The reserve has been reduced.
- Shipping charges are based on a single speaker; therefore, this amount must be multiplied by two (2). does not have a good way to handle shipping for two items with a single listing.
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