Frequency response (at 2 meters)
front left/right 90 Hz to 16 kHz ±4.0 dB
center 90 Hz to 17 kHz ±3.9 dB
surround 90 Hz to 15.4 kHz ±3.9 dB
subwoofer (Maximum Output) 26 Hz to 94 Hz ±2.9 dB
subwoofer (Maximum Extension) 19 Hz to 75 Hz ±2.3 dB
front left/right/center/surround 3.8/5 ohm
Bass limits (lowest frequency and maximum SPL with limit of 10% distortion at 2 meters in a large room)
front left/right/center/surround 80 Hz at 85 dB
subwoofer (Maximum Output) 20 Hz at 93 dB SPL
107 dB average SPL from 25 to 62 Hz
110 dB maximum SPL at 32 Hz
bandwidth uniformity 97%
subwoofer (Maximum Extension) 20 Hz at 88 dB SPL
104 dB average SPL from 25 to 62 Hz
108 dB maximum SPL at 32 Hz
bandwidth uniformity 96%
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 LCR averaged over a ±30° window. The center-channel curve reflects response of the LCR horizontally deployed and averaged over ±45°, with double weight directly on-axis of the primary listener. The surround-channel curve shows the response of the speaker averaged over ±60°.
Measurements were taken with the speaker mounted on a 6-foot stand, which gives anechoic results to approximately 200 Hz. Measurements were also taken from a full 2 meters, which emulates a typical listening distance, allows larger speakers to fully integrate acoustically and, unlike near-field measurements, includes front panel reflections and cabinet diffraction.
The LCR's main features includes a 6 dB depression between 7 and 11 kHz and a 3 dB peak at 13.2 kHz. When vertically arrayed, the unit has well-controlled directivity. The Left/Right and Surround channel traces are basically identical, except that the off-axis surround trace has less high frequency amplitude. When used horizontally, response is nearly identical to the Left/Right channel out to ±45°, but at wider operating angles a huge lobing dip occurs (-27 dB centered at 1.3 kHz.) This is fairly well hidden by our averaging technique.
The -2 dB position on the Boundary Compensation switch cuts response below 400 Hz by 2.6 dB, while the -4 dB position only increases the cut to 2.7 dB. The High Frequency boost switch starts action gently at 2 kHz and reaches a maximal effect of +2.2 dB above 6 kHz. The -2 dB switch position has somewhat more action just above 2 kHz and reaches a maximal impact of 2 dB.
The LFM-1 EX Subwoofer bass limits were measured with it set to maximum gain 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.) All measurements were conducted in both the Maximum Output and Maximum Extension modes.
In its Maximum Output mode, the LFM-1 EX delivered a healthy 107 dB average SPL from 25 to 62 Hz, max SPL of 110 dB at 32 Hz, and 93 dB at its bass limit of 20 Hz (<10% distortion). The main effect of the Maximum Extension mode is reduced SPL capability below 40 Hz; switching to this mode slightly cramped both the measured bass limit and the sub's overall output.
Although the sub's crossover control is marked from 30 to 180 Hz, the control action is limited to 62 to 75 Hz in the Maximum Extension mode and from 50 to 94 Hz in the Maximum Output mode. When the crossover is bypassed the unit has usable response to 153 Hz, but it also has significant out-of-band artifacts between 250 and 400 Hz that may be problematic if the sub is used without a crossover.
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