ADS L-1590\'s For Sale

ADS L-1590\'s
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Buy Now

ADS L-1590\'s:
$1052.00

ADS fans here is a opportunity to own a beautiful pair of L-1590\'s series 2 speakers I took them out of their original boxes and hit them with a little lemon oil to show how beautiful the finish is.Condition wise I would rate them a 9 out of 10.All corners are crisp and sharp with no chips... These speakers were HiFI grandprix award winning 2 years in a row considered by most to be ADS\'s finest effort.This pair is consecutive serial numbers finished in rare rosewood finish. Rosewood option cost an additional $700 over $2,100 base price of the black finish in 1990.Speakers perform 100% and have been in storage in their original boxes for many years.As you can see from the pictures they are in very nice condition.The bottom of the fronts of speakers are a little faded due to sun light shining on them back in the early 90\'sThe series 2 had significant improvements over the series 1.Several questions have been raised about differences between the mid-1980s \"Series 1\" and late-1980s \"Series 2\" ADS speaker models. The following information is adapted (and paraphrased) from some internal and generally published ADS material and manuals. It outlines in some detail the changes from \"Series 1\" to \"Series 2\" that were made to the ADS models L470 up through the L1590 flagship tower loudspeaker, subject of this topic. Series 2 Changes: ADS made a series of significant engineering changes to the \"L\" series loudspeakers (L470 through the L1590) in the 1987-1988 period that resulted in improvements in smoothness, power-handling capability and lower distortion. Improvements were made to crossover networks and driver components themselves. For example, the new version were called \"L1290 Series 2,\" or \"L1590 Series 2.\" Original series were simply \"L1290\" or \"L1590,\" but were referred to internally at ADS as \"Series 1.\" These changes came about as a result of new computer modeling techniques, such as FFT measurements, that allowed ADS engineers to enhance product performance and durability. Another reason for the improvement came about due to concerns about reducing coloration and distortion in the midrange area. Since ADS speakers were already critically acclaimed for excellent performance in smoothness, off-axis response and low distortion, this improvement was further indication that ADS was very serious about making state-of-the-art loudspeakers for the consumer high-fidelity industry. For the woofer systems in the new Series 2 versions of the L1590 and L980, ADS changed the 2-inch diameter voice coil former from aluminum to Kapton, a material unaffected by heat well beyond temperatures found in loudspeakers. Kapton is more stable than aluminum at high temperatures and is not affected by magnetic flux during wide excursions.* This simple change reduced low-frequency reproduction coloration and distortion, improved damping and increased power-handling capability for this woofer system. This was a subtle but important improvement in an already potent low-frequency system in the L1590. For the 2-inch fabric-dome midrange driver, Kapton formers were also used in addition to Ferrofluid to stabilize and cool the voice coil. This improved transient response and smoothed the output in the 5kHz region approaching crossover, reducing a 2-3 dB rise at that frequency to 0 dB. The Kapton former further reduced mass, thus improving efficiency and damping of an already nearly ideal reproducer. The actual passband of the 2-inch Kapton midrange driver was widened to allow a lower crossover to the woofer section, allowing a 350 Hz crossover and the elimination of the 2.5 amp protection fuse. Crossover transition was smoother. The ¾-inch fabric-dome tweeter also 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 that both protected the dome against indentation (fingers) and also improved damping. Ferrofluid added to the voice coil also increased damping and power-handling capability, and because of the lowered mass of the improved tweeter, the high-frequency on-axis response was extended well beyond audible limits. The tweeter\'s transient response was further improved, yet there was scarcely any evidence of ringing in any of the older tweeters. The clarity and smoothness of this tweeter was an important reason for the L1590\'s reputation as a superior sound reproducer. Crossovers were improved in the Series 2 versions. Computer-aided analysis 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 were added to allow larger diameter speaker cable (up to 7 gauge). New-generation \"slick-film\" capacitors with lower dielectric absorption and less heat loss were added along with polyester-film capacitors in the tweeter circuits. Midrange coils were air-core, low-loss types and woofer chokes were ferrite-bobbin designs rated for 0.02% harmonic distortion at up to 500 watts input, just prior to saturation. This is steady-state power rating, whereas peak power inputs go greatly higher than that without saturation. For example, in 1984 Julian Hirsch tested the original version L1290 with peak power pulses of up 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 the L1590 has significantly greater power-handling capability than the 1290, particularly in the bass frequencies. With the Series 2 versions, this power-handling would have been even greater. Therefore, the Series 2 changes were significant. Audible differences were certainly subtle, but when compared side-by-side, improvements could be heard in smoothness and clarity. These were the 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 newer a/d/s/ versions of the CM and M speakers. Whether or not the new versions were better than the earlier Series 2 speakers has been debated at some length, but in terms of measured response smoothness and dispersion and the resultant acoustic power, the Series 2 speakers were probably superior to the later models and certainly among the best loudspeaker ever designed. *Kapton is a high-temperature, stable polyimide dielectric film material used for critical aircraft wiring insulation, solderless terminals and other special applications requiring a wide range of heat cycles. It has been the material used for insulation in NASA lunar modules and so forth . I am listing them as local pick up only even though I have the original boxes I will not be responsible for shipping them ****I do have the optional PA-1 amps.Anyone interested in the the PA-1 amplifiers they are listed in a separate sale.

On Mar-20-15 at 18:18:51 PDT, seller added the following information:

***********With Regards to shipping. If I buyer wants to ship the speakers and send me pre-paid shipping labels. I am willing to seal the boxes up really well and drop them off at the UPS shipping hub in Shrewsbury Ma 01545***************

On Mar-22-15 at 11:26:28 PDT, seller added the following information:

*****Each box measure 16x20x53 aprrox. 120 lbs per unit packed****

Buy Now
Related Items:
Warning: Invalid argument supplied for foreach() in /home/vscan/public_html/store/relateditems.php on line 72

Documentation

  • AIX Local Security Checks
  • Backdoors
  • CentOS Local Security Checks
  • CGI abuses
  • CISCO
  • Databases
  • Debian Local Security Checks
  • Default Unix Accounts
  • Denial of Service
  • Fedora Local Security Checks
  • Finger abuses
  • Firewalls
  • FreeBSD Local Security Checks