DynaudioExcite home theater speaker system Page 3

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TEST BENCH

Frequency response (at 2 meters) front left/right (red): 83 Hz to 15.4 kHz ±2.9 dB center (blue): 101 Hz to 18.2 kHz ±2.5 dB surround (green): 82 Hz to 13.1 kHz ±3.1 dB subwoofer (black): 31 Hz to 124 Hz ±2.4 dB

Sensitivity (SPL at 1 meter with 2.8 volts of pink-noise input) front left/right: 88 dB center: 89 dB surround: 86 dB

Impedance (minimum/nominal) front left/right: 5.1/8 ohms center: 3.9/9 ohms surround: 5.2/10 ohms

Bass limits (lowest frequency and maximum SPL with limit of 10% distortion at 2 meters in a large room) front left/right: 62 Hz at 80 dB center: 80 Hz at 83 dB surround: 80 Hz at 88 dB subwoofer: 32 Hz at 63 dB SPL

83 dB average SPL from 32 to 62 Hz 97 dB maximum SPL at 62 Hz

All of the curves in the frequency-response graph are weighted to reflect how sound arrives at a listener's ears with normal speaker placement. The curve for the left/right front channels reflects response of the X16 averaged over a ±30? window. The center-channel curve reflects response of the X22 averaged over ±45?, with double weight directly on-axis of the primary listener. The surround-channel curve shows the response of the X12 averaged over ±60?. All three were measured on a 6-foot stand which gives anechoic results to approximately 200 Hz. All speaker measurements (subwoofer excepted) are taken at a full 2 meters, which emulates a typical listening distance, allows larger speakers to fully integrate acoustically, and, unlike near-field measurements, fully includes front panel reflections and cabinet diffraction.

Each speaker displayed quite irregular frequency response deviations over increasing radiating angles â€" something that is poorly represented by our averaged measurement technique. In other words, response varied much more dramatically than what you're seeing in the graph. The X16 has limited low frequency dynamic capabilities (its port contributes very little) and ragged response irregularities especially above 2 kHz. The X22 center speaker actually has a 12 dB narrow dip directly on-axis at 4 kHz which falls in frequency, widens, and becomes extreme by ±45?. The X12 surround speaker has a deep, narrow 28-dB dip directly on axis at 3.8 kHz accompanied by fairly radical irregularities that vary considerably with radiating angle.

The SUB 250 subwoofer's bass limits were measured with it set to maximum bandwidth and placed in the optimal corner of a 7,500-cubic-foot room. In a smaller room, users can expect 2 to 3 Hz deeper extension and up to 3 dB higher sound-pressure level (SPL). The subwoofer has severely limited low frequency dynamics, with response falling off at approximately 30 dB per octave below 62 Hz. Nearly all the crossover frequency variation occurs in the upper half of its dial rotation. Although the dial is marked from 50 to 150 Hz, its total frequency range only covers 65-124 Hz and there is an approximately â€"4-dB level interaction in the bottom half of its rotation.

- Tom Nousaine

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