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JM Sound

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Everything posted by JM Sound

  1. View Classified Magnum Dynalab MD208 S/N# 15-03090, List $3800 Upgraded version with 20 preset tuner. First receiver to earn a class A rating. I have remote, but does not work Description: Remote-controlled solid-state receiver with digital volume control and discrete all-analog FM tuner section (digital readout), five line-level inputs, separate record output and pre-out. Amplifier section: Power output: 100Wpc into 8 ohms (20dBW), 160Wpc into 4 ohms (19dBW). Current output: 30A peak. THD: 0.15%. Damping factor: >100. Preamp section: Maximum output: 29V. Volt
  2. This listing is completed.

    • FOR SALE
    • USED

    S/N# 15-03090, List $3800 Upgraded version with 20 preset tuner. First receiver to earn a class A rating. I have remote, but does not work Description: Remote-controlled solid-state receiver with digital volume control and discrete all-analog FM tuner section (digital readout), five line-level inputs, separate record output and pre-out. Amplifier section: Power output: 100Wpc into 8 ohms (20dBW), 160Wpc into 4 ohms (19dBW). Current output: 30A peak. THD: 0.15%. Damping factor: >100. Preamp section: Maximum output: 29V. Voltage gain: 34dB. Frequency response: 20Hz-20kHz, +0, -3dB. THD: 0.1%. S/N Ratio: 96dB. Tuner section: Usable sensitivity (stereo): 11.2dBf. Adjacent-channel attenuation: >12.0dB, 30.0dB narrow. Audio frequency response: 10Hz-17kHz, -1dB. THD (stereo): 0.18%. Capture ratio: >1.5dB. S/N Ratio: 80.0dB. Dimensions: 19" W by 6" H by 15.5" D. Weight: 30 lbs REMOTE INCLUDED BUT NOT WORKING

    1,295.00 USD

  3. Time Left: 4 days and 15 hours

    • FOR SALE
    • NEW

    Demo unit, warranty, includes EHGold 300B's About as good as gets with the M90. Sound is pure music with remarkable clarity. Rated Power Output: 24 Watts RMS Input Sensitivity: 0.33 Volts for full output Input Impedance: 100,000 Ohms Frequency Response: +/- 2dB from 10 Hz to 60,000 Hz Total Harmonic Distortion: < 0.5% Signal-to-Noise Ratio: -84 dB below 1 Watt Damping Factor: 10 Power Consumption: 220 Watts (true RMS) Output Impedance: 4, 8 Ohm Tube Complement: 4 x 300B 2 x 6SN7 1 x 12AX7 Dimensions: 17.5" W x 15" D x 9" H Net Weight (per channel): 46 lbs List $8495

    4,395.00 USD

  4. This listing is completed.

    • FOR SALE
    • USED

    WILL TRADE LOCAL ONLY FINAL REDUCTION Description Ultra dynamic system By PBN Audio, used in CES show, 180LBS EACH Dual 10" woofers, 12" passive, 1000watt sub amps, ribbon tweeter LIST$12500

    3,650.00 USD

  5. This listing is completed.

    • FOR SALE
    • USED

    I have remote, but not working/ retail was $5000 REDUCED!! Hybrid integrated, designed by Alex Peychev, about 80wpc, unit has some scratches on faceplate and a nick on left side of faceplate. Cost $5000 This has the single gain stage(improved version) using (2) ECC99's TRADES CONSIDERED 6moons review: https://6moons.com/audioreviews/aplhifi/uas1_2.html

    1,395.00 USD

  6. JM Sound

    KEF 104.2

    This listing is completed.

    • FOR SALE
    • USED

    LOCAL ONLY/ SO CAL.- woofers refoamed Specification: Model 104/2 System Type: Three-way, floor standing Enclosure type: Coupled cavity Size: 900 x 280 x 415mm (35.5 x 11 x 16.5 inches) Weight: 32kg (70.5 lb) Nominal Impedance: 4 ohms resistive (20Hz-20kHz) Rated maximum power: 200W programme Amplifier Requirements: 25-200 watts per channel into 4 ohms Frequency response (standard): 55-20,000Hz +/-2dB at 2m on design axis Frequency response (with matching KUBE): 35-20,000Hz +/-2dB at 2m on design axis (-6dB at 20Hz, Q=0.5) Sensitivity: 92dB at 2m on reference axis for a pink noise input of 2.83V (anechoic conditions) Maximum output: 112dB on programme peaks under typical listening conditions Finishes: Selected real wood veneers Grille: fabric System: SP3037 Drive units: 2 x B200 bass unit (SP1188), 2 x B110 midrange unit (SP1190), T33 tweeter (SP1191) Crossover: SP2050 (1984 only: SP2042, 2043, 2046). System: SP3128 (Bi-Wire version, 1990 onwards) Drive units: 2 x B200 bass unit (SP1256), 2 x B110 midrange unit (SP1274), T33 tweeter (SP1191) Crossover: SP2173

    735.00 USD

  7. This listing is completed.

    • FOR SALE
    • USED

    Some demo use, cost $9995 PARTIAL TRADES CONSIDERED Shipping about $500 FEATURES: Subwoofers Extensively vented motor eliminates power compression and allows quiet excursion Lighter weight black anodized aluminum cone minimizes moving mass Two-layer coil for reduced back EMF Triple shorting-ring motor for ultra-low distortion Optimized for large enclosures Highest quality materials throughout for long-lasting performance AMT Tweeter Folded Kapton ribbon diaphragm delivers clean, detailed, and highly dynamic output Open-back design permits dipole or chamber loading Pro-level output and ruggedness for PA boxes, studio monitors, or high-efficiency home playback 6.5” Midrange Klippel-optimized, high-performance design Powerful neodymium ring motor Kevlar-reinforced paper cone for excellent detail Perfect complement for ribbon and planar tweeters Wide bandwidth meets high 94 dB sensitivity 1KW Amplifier High-power Class-AB output stage for clean, controlled output Patented tracking downconverter power supply for high efficiency Toroidal power supply transformer Low frequency parametric EQ allows you to boost or cut for custom-tailored sound Advanced soft clip circuitry improves headroom and protects woofers OTC™ (Optimized Thermal Circuit) protects your plate amplifier from potential heat damage Hercules heat sinks dissipate and control heat for ultimate reliability LOCAL PREFERRED JMSOUND (310)372-3487

    3,495.00 USD

  8. Time Left: 15 hours and 21 minutes

    • FOR SALE
    • USED

    List $8995 We built the M50 power amplifier around four KT88 tubes under an ultra-linear circuit that could provide 50 watts of subtly textured music. On good recordings you will hear height and depth. Tones retain their color and body. To get the most out of the design, we used the best caps and resistors we could ever find. The custom wound output and power transformers were specially designed to extend the bass and highs. Just as important, the military grade epoxy circuit boards are designed to minimize component interaction. You will also see the care we took by looking inside. No rat's nest here, neatly laid out Teflon wires, carefully thought through grounding paths, all done in the best traditions of American craftsmanship. Special Features: Pure Class A Ultra-Linear design. Oversized hand wound power and output transformers (custom made in USA). Custom gold plated brass five-way binding posts. 100% handcrafted in California, USA. Specifications Rated Power Output: 50 Watts RMS Input Sensitivity: 0.45 Volts for full output Input Impedance: 100,000 Ohms Frequency Response: +/- 2dB from 12 Hz to 60,000 Hz Total Harmonic Distortion: < 0.5% Signal-to-Noise Ratio: -84 dB below 1 Watt Damping Factor: 14 Power Consumption: 300 Watts (true RMS) Output Impedance: 4, 8 Ohm Tube Complement: 4 x KT88 2 x 6SN7 1 x 12AX7 Dimensions: 17.5" W x 15" D x 8" H Net Weight (per channel): 50 lbs INCLUDES MULLARD KT88 TUBES

    4,195.00 USD

  9. This listing is completed.

    • FOR SALE
    • USED

    2019 model, used in CES show From manufacturer's website: The MargulesU280-SC BlackStereo Tube Amplifier“Just when you thought everything was written, a new idea comes and restates everything to approach perfection”The U280 Project began 30 years ago, where it was issued the first active servo control that allows for the first time the use of the tubes in full class A without any adjustments and an unprecedented thermal efficiency. Today we began a complete new and fresh design of the original idea with all the accumulated knowledge and experience of all these years.The U280SC Black Stereo Tube Amplifier combines the superior sound of vacuum tubes with new and innovative technologies.The results are clearly apparent in its quick detailed dynamics and ultra-smooth transient response. Unusual versatility and unprecedented reliability provide an exceptional perfor-mance upgrade to an already remarkable amplifier.Class-A Output Stage & Active-Servo BiasVacuum tube power amps with class-A outputs are rare. Class-A operation causes the tubes to run quite hot, and increases the chance of saturating the output transformer.Margules has resolved this problem by incorporating a redesigned Active Servo Bias 12 generation, with a faster and precise bias setting.The active servo bias actively tracks the input and output signal, allowing a full class-A output at any level or mode, without overdriving the tubes and transformers.Active Servo Bias also sets DC bias and AC drive levels, assuring optimum electrical and sonic performance throughout the lifespan of the output tubes, no drive or bias adjust-ments are ever needed. New tubes can be installed without test equipment or time-con-suming setup.Active Servo Bias also makes possible to use a variety of output tubes. The 6550, KT88, KT99, KT100, KT 120 can be interchanged without modification.Active Servo Bias is implemented with semiconductors, which are designed for the aerospace industry, assuring long, trouble-free operation.The New U280-SC Black Stereo Tube Amplifier includes a new and improved differential output circuit, for further reduction of the THD and transient distortion.Ultralinear / Triode & Strapped OperationAudiophiles have argued the merits of Ultralinear v Triode operation for 50 years. Triode operation provides lower distortion in the odd harmonics, at the price of reduced power output.The U280-SC resolves this predicament by providing switchable Triode / Ultralinear opera-tion.For those listening sessions where you prefer a softer sound, you simply switch to Triode Mode. And when more power and punch is needed, you simply switch to Ultralinear Mode.Unlike most vacuum tube amplifiers, the U280-SC's outputs can be strapped, for twice theoutput. Start with a single amp, and then add a second U280-SC for increased power.Separate gain controls for each channel make precise balancing easy. This simplifies thesetup of bi-amped systems, as well.Regulated Shunt Power SupplyThe input stages of the new U280-SC Black include a special SHUNT power supply for these critical circuits. Shunt technology provides a dramatic improvement in Q damping, the key factor in regulating voltage for those stages.Damping is critical to overall performance including smoother transient responGood regulation reduces the loss of signal integrity that occurs when the signal itself shifts the amplifier’s operating point. Each channel uses separate regulators that further improve the U280-SC’s already excellent imaging.se and overall staging. Further improvements in quickness, dynamics and the overall life-like listening experience result..Our new Power Supply is virtually indestructible due to specially designed regulation technology that protects the amp from major tube failures.Zero FeedbackThe U280-SC does not use negative feedback as do most tube amplifiers. Negative feedback results in a loss of detail and sound richness. Margules has developed the BEFS (Back Electromotive Force Sensor), which changes the amplifier’s output impedance per load requirement. BEFS along with the active servo allows the amplifier to drive difficult speaker loads with exceptional efficiency, dynamics and extended controlled bass.The U280-SC's Black improved technology and aesthetic design is complemented with a new epoxy pc boards lay out, military grade potentiometers, precision metal-lm resistors and audio grade interstage capacitors.Powevr Ultralinear:50 w/canalPower mono Ultralinear: 100 wTriode:25 w/channelPower mono triode:55 wDisortion:>0.08%Frequency response:20-40 khzMax power consumption:585 wWeight:30.5 kgDimentions (height, width, depth):

    3,999.00 USD

  10. Time Left: 15 hours and 21 minutes

    • FOR SALE
    • NEW

    Latest edition of the MA360 in black(Silver one is SOLD). Demo unit with warranty, partial trades considered. Rated Output Power: 120 Watts RMS at 8 Ohms 240 Watts RMS at 4 Ohms Frequency Response: +/- 0.1 dB from 10 Hz to 50 KHz Signal-to-Noise Ratio: 110 dB Total Harmonic Distortion (THD): <0.016% Gain: 28.9 dB Input Impedance: 33k Ohms (single-ended) 47k Ohms (balanced) Input Sensitivity: 1.25V RMS Output Voltage: 31V RMS Damping Factor: 220, reference 8 Ohms nominal Power Consumption: 550 watts continuous Inputs: 2 balanced via XLR connector (1 per channel) 2 single-ended via RCA connector (1 per channel) Outputs: 2 pairs high quality binding posts (1 pair per channel) Dimensions: 19 in. W x 6 in. H x 17 in. D Weight: 60 lbs. List $7995

    3,495.00 USD

  11. This listing is completed.

    • FOR SALE
    • USED

    SOLD RARE- LOCAL ONLY- SO CAL/TRADES? Description: Planar doublet loudspeaker system. HF level switchable with flat, –3, and –6dB positions. Diaphragm area: 580 sq.in. Foil thickness: 0.00033". Mylar thickness: 0.0005". Laminate adhesive thickness: 0.00015". Gap between conductors: 0.03". Peak-to-peak diaphragm displacement: 0.2". Frequency response: 35Hz–20kHz, ±4dB. Claimed phase response: ±20 degrees, 100Hz–31kHz. Sensitivity: 81dB/W/m. Diaphragm resonance: 34 & 38Hz. Power requirement: 50–200W. Impedance: 8–22 ohms. Maximum spl: 104dB at 1m. Dimensions: 27" W by 54" H by 1" D (3" at base). Shipping weight: 95 lbs each.

    1,250.00 USD

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