Meyer HD-1 (2)
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The Meyer Sound HD-1 is an entirely self-contained, high-definition monitor system that is suitable for a wide variety of critical sound reproduction applications, from near-field monitoring to psychoacoustical research. It is optimized to closely approximate a true point-source radiator, and features a frequency (amplitude) response of 32 Hz to 22 kHz.
The HD-1 comprises an 8-inch cone low-frequency driver and dome tweeter housed in a vented cabinet. An active crossover, optimized pole-zero response corrections filters, loudspeaker element protection circuitry and dual power amplifiers are built directly into the enclosure.
Both HD-1 drivers are of a proprietary design and are individually factory-tested for maximum linearity. Their magnet structures employ sophisticated field-cancelling techniques to minimize magnetic leakage and the cabinets may be placed within two feet of sensitive color video monitors.
The HD-1's power amplifiers utilize complementary power MOSFET output stage; they operate class A at low-to-moderate listening levels and class AB at high levels. Input sensitivity is switchable to either +4 dBu or -10 dBV.
Acoustical (each loudspeaker)
Frequency Response 1 32 Hz to 22 kHz
Free Field -3 dB at 32 Hz and 22 kHz
±1 dB from 40 Hz to 22 kHz 2
Maximum SPL 125 dB peak (120 dB @ 1 meter)
Signal-to-Noise Ratio >100 dB (noise floor 20 dBA @ 1 meter)
Coverage Angle 60 horizontal and vertical
Type Electronically balanced, 10k ohms impedance
Connector XLR (A-3) female
Nominal Input Level Accepts either +4 dBu or -10 dBV, switchable
Type Complementary power MOSFET output stages
Low Frequency 150 watts burst capability
High Frequency 75 watts burst capability
THD, IM, TIM < .02 %
Crossover Optimized pole-zero filter combinations to complement transducer response and to achieve acoustical transparency and flat phase
Low Frequency 8" diameter cone (2" voice coil)
High Frequency 1" dome tweeter (1" voice coil)
Power 3-pin IEC male receptacle. Voltage selector switch for 100/120/220/240 VAC, 50 or 60 Hz (accepts voltages from 90 to 260 VAC)
Dimensions 12" W x 16" H x 14" D (+ 2" additional depth for amplifier chassis and HF dome clearance)
Weight 51 lbs. (23 kg.)
Subject to room loading. Specified for 8 feet actual distance between HD-1 cabinet and a single boundary surface.
One-third octave resolution.
Unless otherwise specified, all acoustical measurements are performed at 1/2 meter from front baffle on tweeter axis. Acoustical decibels are specified re 20 uPa.