ELAC Miracord 70 turntable Lab Report
The partnering J-shaped tonearm features a semi-permanent headshell (held in place by a couple of small bolts, permitting some slight tweaking of azimuth) and offers an effective mass of 12g, making it suitable for a wide range of pick-ups. The cumulative resonance spectrum [see Graph 2] shows a low-level series of main bending/twisting modes from sub-100Hz to 200Hz with more energetic harmonics at 335Hz, 355Hz and, strongest of all, at 485Hz. These upper bass/midrange modes are quickly dispelled, suggesting the mix of alloy and steel in this arm’s design does, indeed, modify its resonant behaviour. Otherwise, bearing friction/stiction is extremely low at <10mg vertically and ~20mg horizontally while the gimbals are well adjusted and betray the minimum of detectable free play. PM
Turntable speed error at 33.33rpm: 33.29rpm (–0.15%)
Time to audible stabilisation: 3sec
Peak Wow/Flutter: 0.03% / 0.07%
Rumble (silent groove, DIN B wtd): –66.0dB
Rumble (through bearing, DIN B wtd): –67.1dB
Hum & Noise (unwtd, rel. to 5cm/sec): –56.9dB
Power Consumption: 5W (2W standby)
Dimensions (WHD) / Weight: 465x140x365mm / 11kg
Price (turntable/arm/cartridge): £1000