HM-1S Self-Powered Studio Monitor 100°H 100°V 8.4" wide 11.5" tall 9.7" deep (10.5 with fan) 11 lbs (5.0 kg) Max SPL (Peak): 116 dB; 120 dB with sub Freq Range: 42-20 kHz

The HM-1S Studio Monitor is a two-way system comprising a 7-inch graphite cone low-frequency driver, and a concentrically-mounted, 1-inch soft-dome high-frequency driver. A constant-directivity, high-frequency horn affords a symmetric 100° beam width. The HM-1S employs optimized electronics, drivers, and cabinet venting (tuned to 40 Hz) to achieve low frequency response far exceeding that of most small speakers.

The HM-1S can be used with the Meyer HM-1S Studio Subwoofer, extending the free-field LF (low frequency) response down to 42 Hz. The subwoofer is powered from the Sub output on the rear panel of the HM-1S. Although each HM-1S Studio Monitor can power a subwoofer, ample LF energy may be obtained by driving one subwoofer from two HM-1S Studio Monitors, resulting in a correctly-summed mono signal. Subwoofer usage depends on the loading conditions, the LF gain desired, and whether a stereo LF signal is required. Placing the HM-1S next to a wall or ceiling (half-space loading) also extends the LF response down to 42 Hz.

The HM-1S Studio Monitor and Subwoofer cabinets are constructed from medium density fiberboard and finished with an attractive, durable oak veneer (natural wood or black). The drivers in the HM -1S and the subwoofer are magnetically shielded and the magnet structures employ field-cancelling techniques to minimize magnetic leakage, allowing speaker placement directly next to color video monitors. Although external heatsinks on the rear of the cabinet provide adequate convection cooling, a variable-speed cooling fan assembly (driven from a rear-panel output and mounted on the rear of the speaker) is available if the HM-1S will be operated in hot temperatures or in an unventilated, enclosed area.

The enclosure contains a built-in, 400 W stereo amplifier, an active crossover, frequency and phase response alignment circuitry, and driver protection voltage limiters. Front-panel LEDs indicate power, signal limit, and thermal overload, and a rear-panel circuit breaker provides overall DC power protection.

The HM-1S accepts a unipolar 48 VDC power source, which may be supplied by the Meyer PS-1 AC Adapter. Using a DC supply enables long power cable runs with minimal induced noise or hum, which is particularly important for recording studios and other noise sensitive environments.

HM-1S Specifications

1. Measurements are for a single HM-1 taken at 1 m on axis, 1/3 octave, unless otherwise stated.
2. Amplitude tolerance depends on loading conditions and whether the subwoofer is used.
3. Flush-mounted into single boundary surface.
4. A single subwoofer adds approx. 8 dB 42 - 100 Hz to the amplitude response a single HM-1.
5. Phase variation from pure delay.
6. Pink noise or music
7. A gradual amplitude attenuation occurs as the angle increases beyond 45°. Greater attenuation occurs at 2 kHz and beyond 10 kHz. There are no response peaks.
8. Capacitively coupled; accepts up to ±50 VDC common mode.
9. Idle current approx. 0.4 A; using the slaved subwoofer increases stated currents by approx. 20%.