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發表於 2017-6-27 07:56:01
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*Sound pressure level
Listening to a large symphonic work and to a folk singer/violin recital should have very different volume setting. Sitting at the centre of the first two rows in a concert hall, the encountered sound pressure level of a large symphonic work may exceed 100db and the microphones that are placed closer for recording such work would pick up even higher pressure level. It would be a joke to play a symphonic work at folk song level and I actually encountered Beethoven 9 being played like this.
For an audio system, the higher the level of sound the more pronounced is the distortion that would be much less conspicuous at low level. Several systems for comparison may sound similar at low level but their faults would be easily revealed when the volume is turned up. The soundtrack is no doubt a contributing factor to the distortion. For example, the Direct Disco album, the first direct to disc by Crystal Clear label. The producer advised listeners to turn the volume way up and compare it with other LPs so as to notice the clean and undistorted sound of his album.
The Reference Recording track, the Testament of Freedom. The chorus towards the end sounds highly distorted and irritating in an ordinary system when played loud, but smooth and easy to the ear in a good system.
For a 200 sq ft listening room, in order to fill up 2/3 of it with soundstage, the volume has to be turned up, though still hard to match the sound level in a live concert with seat in first two rows.
*Sound in HiFi shows
Over the years I have come across numerous systems that sounded impressive in the Hong Kong Show and this means some systems and importers are more devoted than others in the same show. Off hand I am able to cite several though my spelling of the brand and model may be slightly incorrect. The Avant Garde Trio, the MBL 101 Extreme, the Rockport Arraki, the mod system by 摩機鄺 and Tidal speakers, and of course the Goldmund top system that may be played loud with little distortion. Listening notes of these are in another thread. |
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