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A decade or two ago, I stumbled on a surprising demo room at an audio show. I don't recall most of the equipment, but I do remember a pair of Paradigm Studio 20 speakers at one end, their crossover entrails dangling free, connected to the rest of the system by a multiplicity of wires. At the other end, among the usual electronics, was a PC whose screen was a crazy quilt of graphs and menus that constantly twinkled in response to the ministrations of DEQX's Kim Ryrie. He seemed totally absorbed, but looked up and proudly offered to show me what he was doing. When I told him that I was…
Sidebar 2: Associated Equipment
Analog Sources: Garrard 301, Thorens TD 124 turntables; EMT 997, Thomas Schick tonearms; Ortofon SPU-A & SPU 95th Anniversary, Miyajima Premium BE Mono II, EMT OFD 15 & OFD 25 & TSD 15 70th Anniversary pickup heads.
Digital Sources: Halide Designs DAC HD USB DAC; Apple iMac G5 computer running Audirvana Plus 1.5.12 playback software; Sony SCD-777ES SACD/CD player.
Preamplification: Hommage T2 step-up transformer; Shindo Masseto & Allegro preamplifiers.
Power Amplifiers: Shindo Corton-Charlemagne monoblocks & Shindo Cortese,…
Here, DEQX adds a wrinkle that I love. I'd already measured the speakers and created the correction filters, but how did I know if it all did what was intended? Sure, I can trust my ears; below, I tell you what they told me. I could also pull out another toolbox and hope that the configuration and mike setup matched. However, DEQX provides a Verification Wizard that actually repeats the measurement procedure with the correction filters in place. If you've left the speakers and mike in the same positions, the resulting graph is very impressive.
Room Correction
The next step is to…
Sidebar 1: Specifications
Description: Stereo control preamplifier with DSP-based speaker/room correction and 24-bit A/D & 32-bit D/A conversion. Inputs: 2 analog at +17dBu (XLR, RCA), 5 digital (TosLink, S/PDIF RCA, S/PDIF BNC, AES/EBU XLR, USB), 1 XLR microphone with 48V phantom power. Outputs: 4 analog (L/R Main XLR & RCA, L/R Woofer XLR & RCA), 1 full-range digital (BNC), RS-232 port and USB port for computer control. DSP: Dual Analog Devices SHARC 32-bit floating point. System latency: typically 15ms with speaker correction. Crossover slopes: 6–300dB/octave. Analog input…
Sidebar 2: Associated Equipment
Digital Sources: Sony XA-5400ES SACD/CD player; Oppo BDP-105 universal BD player; Baetis XR2 PC-based music server; exaSound e28, Mytek Stereo 192-DSD D/A converters.
Preamplification: Audio Research MP1 multi-channel preamplifier, Meridian HD621 HDMI audio processor & 861 Reference v8 digital surround controller.
Power Amplifiers: McIntosh Labs MC303, Parasound Halo A 31.
Loudspeakers: Bowers & Wilkins 800 Diamond, Bryston Middle T; JL Audio Fathom f113 subwoofer.
Cables: Digital: Black Cat Veloce, van den Hul Flat 180 HDMI,…
Sidebar 3: Measurements
I let the Allnic D-5000 DHT warm up for an hour before passing any signal, to give the tubes' operating conditions a chance to stabilize. (When the unit is first turned on, the needle on the front-panel meter slowly rises until it rests just to the right of the indicator on the scale.) I examined the processor's electrical performance with my Audio Precision SYS2722 system (see www.ap.com and the January 2008 "As We See It"), mainly using the TosLink optical input, though I repeated some of the tests using a USB connection from my MacBook Pro Laptop running on…
Sidebar 3: Measurements
Before examining the DEQX PreMate's equalization and correction features, I wanted to make sure that its basic performance as a D/A processor was up to the expected standard—"First, do no harm" is as fundamentally important in digital signal processing as it is in healthcare. I examined the PreMate's electrical performance with my Audio Precision SYS2722 system (see www.ap.com and the January 2008 "As We See It"), mainly using the TosLink optical input, though I repeated some of the tests using a USB connection from my MacBook Pro laptop running on battery power.…
Manufacturers' Comment
Editor: Thank you, Messrs. Dudley and Atkinson, for your listening review and test measurements of the Allnic Audio D-5000 direct-heated-triode digital-to-analog converter in the December 2014 issue (p.93).
While Art was very positive about the D-5000 DAC's performance, though questioning the value of the flexibility provided by upsampling and DSD conversion (about which we all know many audiophiles are rather ambivalent), the measurement results John obtained shocked him—and us!! John wondered if the results could have been due to something that happened…
Can an $18,000 power amplifier be a bargain?
Can an $18,000 wristwatch?
After a certain point, the usual value-for-money considerations don't apply. With amplifiers, I'm not sure where that point is. But, for me, the Boulder 1060 is hors de categorie, as the French hi-fi scribes like to say: "out of category."
Nevertheless, I like to escape now and then, as I did with the Lamm Industries ML1.2 monoblocks and the $15,000 McIntosh MC2000 Commemorative (in the July 1998 and November 1999 issues, respectively).
Hell, I could have gone crazier still: $59,000 for a pair…
Sidebar: Specifications
Description: Solid-state, balanced stereo power amplifier. Rated power: 300Wpc into 8 ohms (dBW), with 800W peaks into 4 ohms, 1600W peaks into 2 ohms. THD+noise: 0.001% (20Hz–2kHz), 0.005% (20kHz). Frequency response: 0.015Hz–150kHz, –3dB. Voltage gain: 26dB. S/N Ratio: 127dB, unweighted, 20Hz–20kHz, re: 500W/8 ohms. Input impedance: 50k ohms, balanced.
Dimensions: 18" W by 9.5" H by 22.5" D. Weight: 140 lbs. Shipping weight: 220 lbs.
Serial number of review sample: Not noted.
Price: $18,000 (2000). Approximate number of dealers: 28.
Manufacturer:…