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tketcham's My Stereo System
IP Address: 70.20.52.160 Last Update: June 11, 2018 at 04:34:29
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: PrimaLuna Prologue Premium; 1 x 5AR4 rectifier and 2 x 12AU7 output tubes per channel; point-to-point wiring; THD 0.05%, 9Hz to 120kHz (-3dB); S:N ratio 92dB flat, A-weighted; 110k ohms input and 2800 ohms output impedance; 12 dB gain; 200 mV input sensitivity.

Tube buffer: Eastern Electric Mini-max BBA Has 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 better match impedance loading.
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.

Subwoofers (2): Velodyne Optimum 10; Powered, 1200 watt amps, sealed 10 inch forward firing drivers down to 23Hz, using line level inputs, both set at 100Hz rolloff. Subs located to the outside and forward of the main speakers. Speakers running full range.
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 SPDIF digital output to external 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.
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): 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 cables.
Assorted 0.5m, 1.0m, and 6.0m (subs) interconnects. Majority of them are Kimber Hero cables.
Other (Power Conditioner, Racks etc.): Power conditioner with isolated circuits.
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: Schiit Audio Loki Mini tone control used between preamp and power amp to roll off speakers at 100Hz and boost frequencies around 300Hz to 400Hz.
Herbie's "Donut" mats used to adjust for SRA to maintain 2mm record height above platter.
Herbie's "Way Excellent" platter mat on turntable 2.
Soundsmith EZ-Mount aluminum cartridge screws to dampen tonearm 1 when using lightweight (5.3g) cartridge.
Herbie's "Tenderfeet" under CD player.
Room Size (LxWxH): 22' x 12' x 7.75'
Room Comments/Treatments: Carpet over cement floor. Tongue-and-groove pine paneling. Speakers & subwoofers well out into room and component rack back towards front wall. Subwoofers sitting just outside and forward of speakers near side walls. Record shelves and CD racks used as dispersion panels along side walls, with foam bass "traps" in front corners.
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.

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