Sound Level (SPL) Measurements at various frequencies (Amplifier volume adjusted so that meter reading was 70 dB at 40 Hz and at 1 kHz):

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|Hz/dB: |20|25|31.5|40|50|80|100|125|160|200|1k|2.5k|5k|10k |12.5k|16k|20k|
|-------|--|--|----|--|--|--|---|---|---|---|--|----|--|----|-----|---|---|
|Stereo:|74|68| 70 |70|72|80| 79| 78| 76| 72|70| 72 |73| 69 | 68  | 65| 61|
|-------|--|--|----|--|--|--|---|---|---|---|--|----|--|----|-----|---|---|
|THX    |  |  |    |  |  |  |   |   |   |   |  |    |  |    |     |   |   |
|mode:  |68|70| 70 |70|72|79| 74| 78| 75| 73|70| 73 |73| 67 | 64  | 61| 60|
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P.S. Hope U can understand the table. For example, at 50Hz, in Stereo mode, the response was 72dB, in THX (surround) mode, it's also 72dB. At 200Hz, its 72 and 73dB respectively.

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