avalon65,
Most of, but not all, the makers of equipment in the Guangdong province are in Shenzhen - about an hour away on harrowing Chinese roads (my years in New York did not prepare me for driving in China - never, oh my!!!!).
There may be some in Guangzhou, but most are in Shenzhen. I think the other area In China might be well north near Shanghai - but I think those makers there tend to be more computer oriented.
Do some googling on the internet ' audio guangzhou' and you might come up with something.
Factories are funny there - I went to one fella's place that was located on three floors - on the first floor he made 128 and 256 mb F drives, on the second bicycle tubes primarily in aluminum and on the third mops and brooms. Talk about diverse - same owner same building, all brimming with orders. The Chinese are so industrious it's amazing.
I stay at the Garden Hotel - I think GZ's only 5 star. A good place to bed down and enjoy the little city of 6.9 million or so.
Enjoy - congrats on the baby
