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tketcham 's My Stereo System
IP Address: 71.168.98.24 Last Update: July 21, 2020 at 05:02:41
Amplifier: Power amp: NAD Masters Series M22; Solid state switch mode (pulse-width modulation) using Hypex nCore technology; >250W continuous from 8 to 2 Ohms; 640W dynamic at 4 Ohms (the nominal impedance of my speakers); THD <0.003%, 20Hz to 20kHz; S:N ratio >100dB at 1W, A-weighted; 17k ohms input impedance; 29 dB gain; 1.6 V input sensitivity.
Preamplifier (or None if Integrated): Preamplifier: (In transition);

Tube buffer: Eastern Electric Mini-max BBA; Two ECL82 combined triode/pentode tubes and one 6X4 rectifier tube; 220k ohms input impedance and 800 ohms to 10k ohms output impedance; tube gain 0dB to 18dB plus active line control. Used between preamplifier and subwoofer plate amps to improve voltage transfer.

Tone control/buffer: Schiit Audio Loki Mini; used between preamp and power amp to gently roll off speakers below ~90Hz; I slightly boost upper mid-range and treble frequencies to account for age-related hearing loss.
Speakers: Speakers: Dynaudio Contour S1.4; Two-way bass reflex (rear port) stand mount; 86 dB sensitivity; 4 Ohms nominal impedance; Esotec 28mm soft dome tweeter and 170mm cone mid/woofer. Running them with bass ports plugged. (See tone controls above.)

Subwoofers (2): Velodyne Optimum 10; Powered; 1200 watt Class D amps; sealed 10 inch forward firing drivers down to 23Hz; DSP equalization and phase control; using line level inputs, both subs set at 90Hz roll off.
Sources:
CD Player/DAC: CD player: Rega Apollo (original version); Top loading, 44.1kHz sampling with 20GB 32 bit CPU processor and Wolfson dual-differential 24 bit DAC. Currently using S/PDIF digital output to Rega DAC.

DAC: Rega DAC (original version); 16/20/24-bit at 32kHz to 192kHz; dual Wolfson WM8742 DAC's; five filters per high/low sample rate; non-upsampling; synchronous clocking.
Turntable/Phono Stage: Turntable 1: Michell Engineering Gyro SE; Belt drive, suspended aluminum chassis and acrylic "spyder" plinth with cone footers, vinyl/acrylic platter with metal periphery weights, separate PSU and isolated motor. Orbe clamp upgrade. Replaced stock aluminum SME tonearm mounting plate with acrylic plate to correct chassis balance problem.
Tonearm 1: SME 309; Dual pivot 9", magnesium arm tube, removable headshell, 9.5g effective weight.
Cartridge 1: Audio-Technica ART9; Low output moving coil, line contact stylus; 8.5g weight; 0.5 mV output; 12 Ohms internal resistance; 18x10-6 cm/dyn compliance (100Hz); 1.6-2.0g VTF.
Phono preamp 1: AcousTech PH-1P (Sutherland design); Solid state, 42/52/61.5 dB gain, 100/47K Ohms loading plus custom resistor slots, currently using 220 Ohm resistors.

Turntable 2: Music Hall mmf-7; Belt drive, dual MDF plinth with sorbothane dampers, spike footers, acrylic platter, isolated motor, speed controller.
Tonearm 2: Pro-Ject 9; Dual pivot 9", aluminum arm tube, fixed headshell, 11.0g effective weight.
Cartridge 2: Audio-Technica AT-33PTG; Low output moving coil, micro-linear stylus; 6.9g weight; 0.5 mV output; 17 Ohms internal resistance; 10x10-6 cm/dyn compliance (100Hz); 1.6-2.0g VTF.
Phono preamp 2: Rogue Audio Stealth; Solid state, 46/50/60/65 dB gain, 70/100/300/1.1K/47K Ohms loading.
Other Source(s): Network audio bridge: Bluesound Node 2i; Up to 24-bit/192 kHz playback; SNR 110 dBA; THD 0.005%; using NAS drive Ethernet input and S/PDIF output to Schiit Bifrost 2 Multibit DAC.

DAC: Schiit Bifrost 2; 16/44.1 to 24/192; Schiit's True Multibit™, with proprietary digital filter using Analog Devices SHARC DSP processor, Analog Devices AD5781ARUZ x 2 DAC; THD <0.003%, 20Hz-20KHz +/-0.25dB, at max output; S/N >114dB, referenced to 2.0VRMS, unweighted; 24VA transformer power supply.

Oppo BDP-103D, previously used for movies, is now a door stop due to corrupted firmware update.
Other Accessories/Room/Misc.:
Speaker Cables/Interconnects: Monster copper speaker wires.
Assorted 0.5m, 1.0m, and 6.0m (subs) interconnects; the majority of which are Kimber Hero cables but include several Pangea SE cables.
Other (Power Conditioner, Racks etc.): PS Audio and Blue Circle power conditioners.
Salamander Designs "Archetype" triple column equipment rack.
Turntable 1 sits on Ginkgo Cloud isolation platform using Herbie's "grungebuster" balls (purchased before the big price increase).
Tweaks: Herbie's "Donut" mats; used to maintain 2.10mm record height above platter for consistent SRA. Combination of 0.3mm, 0.5mm, and 0.8mm mats maintain record height within 0.15mm.
Herbie's "Way Excellent" platter mat on turntable 2.
Soundsmith EZ-Mount aluminum cartridge screws to dampen tonearm 1 when using lightweight cartridges.
Herbie's "Tenderfeet" under CD player.
Room Size (LxWxH): 22' x 12' x 7.75'
Room Comments/Treatments: Carpet over cement floor with a four foot wide strip of lightweight flooring laid down over the carpet to put some liveliness back into the acoustic space. Diagonal tongue-and-groove pine paneling. Speakers & subwoofers well out into room and component rack back towards front wall. Subwoofers sitting forward of speakers. DIY fabric covered foam panels on front wall. Stacked Auralex MegaLENRD bass "traps" to tame bass node in right front corner.
Music Preferences and Comments:
Music Used (Genre/Selections): Singing and/or musical instruments. Rap isn't either.
System Goals/Comments: To hear music.
System Strengths: I can hear music.
System Weaknesses: It isn't live music.
Video/HT System: Integrated
Other Interests/Hobbies/Occupation: Skiing, bicycling, canoeing, hiking, and of course, music. Retired forester.

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