There is a very good glossary of subjective audio terms in Stereophile. It was written by J. Gordon Holt and was published in three parts, July, August and September, 1993.
There is also a series of articles on audio jargon and phrases written by Jack English in Stereophile, May, June and December, 1993.
From page 69, August, 1993:
"dark. A warm, mellow, excessively rich quality in reproduced sound. The audible effect of a frequency response which is clockwise-tilted across the entire range, so that ouptput diminishes with increasing frequency. Compare 'light'."
The phrase "dark background" is not specifically identified. Depending on the context of its usage, "dark" could have the meaning as defined above. Alternatively, it more likely means silent, or free from noise. In the context of a turntable, I suspect that the latter is more likely to be the intended use of "dark" as an adjective.
There is also a series of articles on audio jargon and phrases written by Jack English in Stereophile, May, June and December, 1993.
From page 69, August, 1993:
"dark. A warm, mellow, excessively rich quality in reproduced sound. The audible effect of a frequency response which is clockwise-tilted across the entire range, so that ouptput diminishes with increasing frequency. Compare 'light'."
The phrase "dark background" is not specifically identified. Depending on the context of its usage, "dark" could have the meaning as defined above. Alternatively, it more likely means silent, or free from noise. In the context of a turntable, I suspect that the latter is more likely to be the intended use of "dark" as an adjective.