What is the ideal number of drivers in a loudspeaker system?
a) two
b) three
c) four or more
d) none of the above
You have your answer? Good. Next question:
What is the best type of crossover in a loudspeaker system?
a) first order (6dB/octave)
b) second order (12dB)
c) third order (18dB)
d) fourth order (24dB) or higher
e) none of the above
Got that one, too? Well, if you've noticed what kind of speaker is being…
Description: Single-driver loudspeaker with dedicated stand. Drive-unit: 4.7" (120mm) glass-fiber-cone. Magnet insulation: EIAJ Grade 1. Frequency response: 40Hz–20kHz, –10dB. Impedance: 6 ohms. Sensitivity: 83.5dB/V/m. Power handling: Rated 35W/Maximum 70W.
Dimensions: 11.3" (290mm) W by 14.3" (365mm) H by 14.7" (375mm) D. Height on stand: 38.5–38.9" (987–997mm). Weights: speaker, 26.5 lbs (13.3kg); stand, 28.7 lbs (13kg).
Finish: Silver.
Serial Numbers Of Units Reviewed: ZD700090, ZD700066.
Price: $7000/pair, including stands. Approximate number of…
Analog Source: Linn LP12 (fully updated) turntable, Linn Ittok tonearm, AudioQuest AQ-7000nsx cartridge.
Digital Sources: PS Audio Lambda II CD transport, Perpetual Technologies P-1A/ModWright P-3A digital processors with Monolithic Sound P3 power supply, Ayre CX-7e CD player.
Preamplifier: Convergent Audio Technology SL-1 Ultimate.
Power Amplifiers: PrimaLuna ProLogue Seven and Audiopax Model 88 monoblocks; PS Audio GCC-100.
Loudspeakers: Avantgarde Uno.
Cables: Digital: Mystic Reference I2S, Illuminati Orchid AES/EBU. Interconnect: Nordost…
The Eclipse TD712z's voltage sensitivity was to specification but significantly lower than average, at an estimated 83.5dB(B)/2.83V/m. However, its impedance remains above 6 ohms at almost all frequencies (fig.1), and rises in value above the midrange, this due, I assume, to the effect of the single drive-unit's voice-coil inductance. This speaker will be easy to drive, even by low-powered tube amplifiers.
Fig.1 Eclipse TD712z, electrical impedance (solid) and phase (dashed). (2 ohms/vertical div.)
The traces in fig.1 feature a couple of…
I think of Tony's theory every time…
Many of us choose…
Description: CD player with remote control and digital input and output. Analog outputs: 1 pair unbalanced (RCA), 1 pair balanced (XLR). Digital outputs: 1 S/PDIF (RCA), 1 AES/EBU (XLR). Digital input: 1 S/PDIF (RCA). Maximum output level: 4V RMS at 1kHz (balanced), 2V RMS (unbalanced). Frequency response: 2Hz–72kHz, +0/–3dB (full-range); 20Hz–20kHz, +0/–0.1dB (audible). THD: <0.001% at 1kHz, 0dBFS, A-weighted. Intermodulation distortion: <0.003%. Intrinsic jitter: <25 picoseconds RMS. Power consumption: 25W.
Dimensions: 18.25" (476mm) W by 5.5" (…
Digital Source: Ayre C-5xe universal player, Slim Devices Squeezebox.
Preamplifiers: Ayre K-1x, Conrad-Johnson ACT2, Krell Evolution 202, Musical Fidelity Nu-Vista.
Power Amplifiers: Ayre MX-R, Krell Evolution 600 (both monoblocks); Musical Fidelity Nu-Vista 300.
Loudspeakers: Dynaudio Special Twenty-Five, Dynaudio Confidence C-4, Dynaudio Contour C-1, Vandersteen Quatro Wood.
Cables: Interconnect: Krell CAST, Shunyata Research Aries. Speaker: Shunyata Research Lyra, Stereovox Firebird. AC: Shunyata Research Anaconda & Orion.
Accessories…
The Simaudio Moon Evolution SuperNova put out a maximum of 4.132V at 1kHz from its balanced jacks, and exactly half that level from the unbalanced jacks, the latter 0.3dB above the CD standard's 2V RMS. Both outputs preserved absolute polarity (ie, were non-inverting), and the source impedance was a low 50 ohms unbalanced, 100 ohms balanced. Error correction was superb, the player not stuttering until the laser-cut gaps in the data spiral on the Pierre Verany Test CD were 2.4mm in length! (When a player has a digital output, I monitor the error-flag bit in the…