I have a Grunding hifi consisting of SV2000, ST2000, PS3500, CF5100 and M800 speakers.
Can anyone give me some information about these? Are they low/mid/high range? Is there a market for them?

Anyone?

Grundig used to make great reel-to-reel tape recorders, and I remember radios made by them. I cannot remember them ever being a sough after Hi Fi thing back in the day.

Perhaps you need to find a nostalgic German… 😉

German. Decent enough reel-to-reel tape machines in the seventies.

Pretty low range by today’s standards, I should think.

Hipsters like old stuff, apparently…

Yes, over here they were tainted by shit tellys that you get from radio rentals.
They look the part though – I would have thought a fully working system would be rare enough to be of value to people who like vintage stuff. As Mr Woppit says – Hipsters.

It was generally cheap but serviceable. Back in the days of turntables typically a “stereogram” with a Garrard SP25.