Stereo system (current)

by mike_mds on

Description

Running a pair of VR-4SR speakers bi-amped with a pair of Audio Research D300 amps.  Front end is an Audio Research CD3 as a transport and a Wiim Pro streamer both feeding a Denafrips Pontus II DAC into an Audio Research LS9 preamp.

All interconnects are balanced (Mogami wire with Neutrik connectors) with the exception of the BJC RCA digital cable from the Wiim to the Denafrips (hoping Wiim comes out with a new Pro with an AES/EBU output at some point).  Speaker cables are two identical pairs of Bryston SC4.
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Components Toggle details

    • Monster Power HTS-3600
    https://content.abt.com/documents/32859/HTS3600.pdf
    • Monster Power AVS-2000
    https://pdf.crutchfieldonline.com/ImageBank/v20030422153100/Manuals/119/119AVS2000.PDF
    • Wiim Pro Streamer
    https://wiimhome.com/wiimpro/specs
    • Von Schweikert Audio VR-4 SR

    Specifications:

    System Type:Dynamic-driver four-way system using a triple-chambered transmission line and two-piece stacking enclosure system to eliminate resonance and ensure image focus.

    Woofer Tuning:The triple-chambered transmission line is a hybrid design composed of three separate chambers coupled to the room by a tuned vent at 23 Hz. The chamber filling is acoustic foam and Dacron. The 4"-wide vent tube with 7" flare extends bass response without the "one note bass" problem found in other ported systems. Dynamic range is incredible due to the large amount of low frequency air movement.

    Cabinet and Bracing:A two-inch thick front baffle provides exceptional vibration control and image solidity, while one-inch MDF fiberboard interlocking braces provide exceptional rigidity and freedom from boxy colorations. The internal damping consists of thick acoustic felt and foam lining with Dacron stuffing to eliminate cavity resonances. Large carpet spikes are provided.

    Size:Midrange/Tweeter (14"h x 11"w x 24"d). Woofer (29"h x 11"w x 24"d). System (44"h x 11"w x 24"d).

    Weight:Woofer module: 97 lbs.
    M/T module: 53 lbs.
    System: 150 lbs. each.Driver Complement:2-8.5" aluminum woofers from Norway, 1-7" carbon Kevlar-cellulose Aerogel midrange driver from France, 1-1.5" silk dual concentric ring tweeter from Denmark, 1-1" rear firing ambience mid/tweeter with fabric dome and transmission-line loading from Denmark. All drivers use our proprietary Advanced Motor System with low distortion design.

    Crossover:Acoustic fourth order, at 190 Hz and 1.9 kHz, optimized for flat off-axis response and phase consistency over a wide Global Axis. Very high quality parts are used from France, Germany, and the U.S., including Hovland film and foil capacitors, Solen film-foil capacitors, Solen perfect lay inductors, film-foil resistors, and Analysis Plus internal wiring.

    Binding Posts:Double sets of five-way rhodium posts enabling bi-wiring. Single wire can be used with optional Data Link connector.

    Ambience Driver:1" treated fabric dome with Wave Guide and transmission-line rear wave loading. Ambience circuit uses Dimensional Control (effects level) to compensate for room acoustics and soundstage depth. Provides a Global Axis polar response pattern to simulate live musical reproduction.

    Frequency Response:20Hz-25 kHz, +/- 3 dB, 18 Hz-40 kHz -6 dB, (+/- 1dB at midband).

    Impedance:6 ohms avg. (4 ohms 20 Hz-150 Hz; 8 ohms 150 Hz-20 kHz).

    Recommended Power:20 watts up to 500 watts

    Sensitivity:92 dB @ 1w/1m using 2.83V.
    • Audio Research D-300
    POWER OUTPUT
    160 watts per channel into 8 ohms, 300 watts per channel into 4 ohms.
    POWER BANDWIDTH
    (-3dB points) DC to 150 kHz into 8 ohms.
    FREQUENCY RESPONSE
    -
    INPUT SENSITIVITY
    1.9V RMS for rated output (25.7 dB gain) unbalanced or balanced.
    INPUT IMPEDANCE
    150K ohms unbalanced, 300K ohms balanced differential.
    OUTPUT TAPS
    -
    OUTPUT REGULATION
    0.07dB 8 ohm load to open circuit
    OVERALL NEGATIVE FEEDBACK
    21dB
    DAMPING FACTOR
    130
    DISTORTION
    -
    SLEW RATE
    50V/µs
    RISE TIME
    1.7 µs
    HUM & NOISE
    Less than 60 µV RMS (116dB below rated output IHF A-weighted)
    POWER SUPPLY ENERGY STORAGE
    175,000 µF total
    POWER REQUIREMENTS
    105-125VAC 60Hz (210-250VAC 50Hz) 520 watts at rated output (165WPC 8 ohms), 890 watts at 300WPC 4 ohms, 1000 watts maximum, 200 watts idle.
    OTHER
    Input Polarity: Non-inverting at unbalanced inputs. Balanced pin 2+ (IEC-268)
    DIMENSIONS
    19" (48 cm) W (standard rack panel) x 7" (17.8cm) H x 12 ⅞" (32.7 cm) D (front panel back). Handles extend 1½" (3.8 cm) forward of the ⅜" thick front panel. Output connectors extend 1" behind rear panel.
    WEIGHT
    48 lbs. (21.8 kg) Net; 62 lbs. (28.1 kg) Shipping.
    • Audio Research LS-9
    FREQUENCY RESPONSE
    ±0.5dB 0.2Hz - 30kHz at rated output, -3dB below 0.1Hz and above 60kHz
    DISTORTION (THD)
    Less than 0.005% at 2V RMS balanced output
    NOISE & HUM
    20µV RMS residual IHF weighted noise output Bal with volume control set one step up from minimum (100dB below 2V RMS output).
    GAIN
    Main output: 12dB. 6dB SE (optional 18dB Bal). Tape output: 0dB.
    INPUT IMPEDANCE
    100K ohms Bal, 50K ohms SE,
    OUTPUT IMPEDANCE
    500 ohms Bal. 250 ohms SE. 10K ohms minimum load and 1000pF capacitance
    OUTPUT POLARITY
    -
    MAXIMUM INPUTS
    14V RMS maximum balanced, 7V RMS maximum SE.
    RATED OUTPUTS
    2V RMS into 100K ohms load Bal., 1V RMS into 50K ohms load SE . Maximum Bal. output capacity is 24V RMS at less than 1% THD (1kHz)
    POWER SUPPLIES
    Electronically regulated complimentary voltage supplies using discrete components. Automatic 30 sec warm-up mute. Automatic trip sensor for low-line conditions (stable line resets automatic warm-up mute).
    POWER REQUIREMENTS
    100-135VAC 60Hz (200-270VAC 50/60Hz) 20 watts maximum continuous. (There is no power switch)
    OTHER
    Inputs: Digital and Aux are Bal. Tuner, Video, Aux2 and Monitor are SE.Outputs (4): Main Bal. (2), Main SE (1) and Record SE (1).
    DIMENSIONS
    19" (48 cm) W x 3½" (8.9 cm) H x 11" (28 cm) D. Handles extend 1.5 " (3.8 cm) forward of the front panel.
    WEIGHT
    11 lbs. (5 kg) Net; 21 lbs. (9.6 kg) Shipping.
    • Audio Research CD-3
    ANALOG OUTPUTS
    1. Balanced XLR 5.4V RMS (+14.6dBv) max. 2. Single-Ended RCA 2.7V RMS (+8.6dBv) max.
    OUTPUT IMPEDANCE
    (Analog) 400 ohms BAL, 200 ohms SE.
    FREQUENCY RESPONSE
    0.5-20,000Hz +0 -.1dB
    S/N RATIO
    90dBA
    DISTORTION
    .025% 1kHz
    CHANNEL SEPARATION
    92dB 1kHz
    RESOLUTION
    24 BIT DELTA-SIGMA DAC
    DIGITAL OUTPUTS
    1. XLR Balanced AES/EBU 110-ohm 4V P-P. 2. BNC coax SPDIF 75-ohm 0.7V P-P.
    SIGNAL FORMAT
    Sampling frequency: 44.1kHz. Quantization Bit: 16bit linear per channel. Channel bit rate: 4.3218Mb/sec. Channel modulation code: EFM (8-14 modulation). Error correction: CIRC (cross interleave Reed Solomon code).
    DRIVE MECHANISM
    Wow & flutter: Unmeasurable (Quartz stability). Discs: Accepts 5" (12cm) and 3" (8cm) sizes.
    OPTICAL PICKUP
    Type: 3-beam LDGU (Laser Diode & Grating Unit) with holographic diffraction light pen. Laser: GaAIAs semiconductor, 780 nm, 0.5mW max output. Servo: Digitally controlled low-inertia linear positioning actuator.
    JITTER REDUCTION
    High-stability crystal-controlled re-clocking for all outputs
    POWER REQUIREMENTS
    100-135VAC 60Hz (200-270VAC 50/60Hz), 40 watts maximum. (26 watts standby)
    DIMENSIONS
    19" (48 cm) W x 5 ¼" (13.4 cm) H (standard rack panel) x 12 ¼" (31.1 cm) D. Handles extend 1 ½" (3.8 cm) forward of the front panel. Rear connectors extend ¾" (1.9cm).
    WEIGHT
    25 lbs. (11.4 kg) Net; 35 lbs. (15.9 kg) Shipping.
    • Denafrips Pontus II DAC
    https://www.denafripsth.com/downloads/denafrips-pontus-ii-dac-owners-manual-(en).pdf

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