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I think they like records and tapes, but digital music seems not to affect them.
Digital music recorded at 16 bits (standard CD) has only 0.39% of the information of the same music recorded at 24 bits.
The CD standard was arrived at empirically as good enough for human ears.
I read about one farmer who had a tape setup of classical music recorded from albums that he played to his cows and got 15% more milk. When CD's came along he replaced the analogue system and his milk production returned to the original amount.
I think that its just that the analogue music on albums can contain more musical information depending on the skill of the engineers and the quality of the equipment. All of the original recording is almost always done on digital tape, but those are expensive machines recording at 24 bit or better. Most of those bits are lost when they pipe it down to 16 bit CD.
I haven't even touched on the fact that the original recording is usually done at a higher frame rate (samples per second) which is piped down to the CD standard, resulting in more orders of magnitude of lost information.
... I read about one farmer who had a tape setup of classical music recorded from albums that he played to his cows and got 15% more milk. When CD's came along he replaced the analogue system and his milk production returned to the original amount.
Well, 2^16 = 65536 versus 2^24 = 16777216 so you throw away 16711680 bits with each sample.
By your math, reducing your sample size to eight bits would result in half as good sound, while in actuality, eight bit sound is not listenable.
The point is that animals may have more accurate hearing than us and so 16 bit sound may sound like eight bit to them.
Visually, flies see at a higher sample frequency than us, so a TV movie looks like a series of still pictures to them.
So if there are ultrasonic noises put out by amplifiers or their inputs they may be filtered out or not. Probably the cheaper brands don't bother as the customer never complains.
Modern tweeters shouldn't have any problem with arbitrarily high frequencies.
http://www.sonicelectronix.com/item_13189_MB+Quart+DSH+216.htmlhttp://There are dozens of cheap car speaker systems on this site which are rated far into the ultrasonic.