I've never owned a 9300, but I do own a 8500, and have also owned a 9000 like you.

I did once look into getting a 9300 myself but decided against it as I was told that the amplifier was not as good as in the 8500 (and I use my 8500 with passive Beovox speakers, so the amp is important!).

When I researched the 9300 however, my understanding was that the Phono and Tape 2 input buttons would work dependent on what was connected to that input - if you had the Beogram 4500 connected to it, you would be able to control that by remote, and likewise if you had a B&O external tape deck connected instead.

One way to extend the inputs would be to add a B&O MCL2AV link room system which you would connect to the Aux input of the 9300.  You could then connect your internet box and REVOX tapecorder to that, and switch to them using LINK room commands on your B&O remote.  You could have your Beogram 4500 connected to the 9300's Tape2/Phono input, which would have the advantage of allowing you to control the Beogram with remote too.

 

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my understanding was that the Phono and Tape 2 input buttons would work dependent on what was connected to that input – if you had the Beogram 4500 connected to it, you would be able to control that by remote, and likewise if you had a B&O external tape deck connected instead.

I can verify to that. This only has to do with the control. There is only one physical input for either Phone or tape2.

Ah yes, now I think of it, the other inputs you want to add (the tapecorder and the internet box) don't need to be controlled by your B&O remote, so a simple external tape switch box might be a better solution, such as link with DIN connectors, or with RCA connectors.  Connect your Beogram to the Phono/Tape 2 input, and your other devices (via the switch box) to the Aux input.

I used to have a tape switch box such as this myself, which I used so I could have my Beogram turntable an also a reel-to-reel tape deck connected to by Beosound 4 (because the Beosound 4 has only one aux input), and it worked fine.

If you ever want to use datalink with the 'expanded' input then it could be worth trying to find the B&O Aux Expander, which gave full 7-pin DIN switching from up to 4 inputs.  They do come up on eBay occasionally:

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Alternatively, connect a Playmaker to the BC9300 Aux input, stream Qobuz from your phone using airplay/DNLA and connect the Revox tapedeck to the Playmaker's (auto-sensing) aux input.  Instead of a Playmaker you could also do this with Essence Mk1 or Mk2.

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If you ever want to use datalink with the ‘expanded’ input then it could be worth trying to find the B&O Aux Expander, which gave full 7-pin DIN switching from up to 4 inputs.  They do come up on eBay occasionally:

I've never heard of the B&O Aux Expander, but now I really want one.

It took me several years to find my Aux Expander - I think I paid about £15.

Ref Playmaker, it's best understood by looking through the attached installation manual.  The setup that I have described is at page 11 - you would need to set the Playmaker to 'fixed output level' and also set it to A.OPT 0 so that you don't get IR conflicts with the Beomaster etc. (Essence setup is very similar, at least for my Essence Mk2).  The Playmaker 'priority of sources' is:  AirPlay, DNLA, then sources connected to Line-In.  I never had much success with DNLA but performance was much improved when I became a late convert to Apple/Airplay.  Also, user experience suggests that you are better off providing Playmaker with a wired network connection, rather than wireless.

There are some differences between the early Mk1 and Mk2 Playmakers.  From memory, the Mk1 accepted FLAC format music, whereas the Mk2 couldn't.  See here for type number differences:  /forum/general-discussion-and-questions/how-can-i-see-if-a-playmaker-is-a-mki-or-mkii-version-and-other-related-questions

And this cable will connect Playmaker output to Beocenter/master aux input: 

Thanks for this - it opens up some possibilities for me for both my Beosound 4 and my Beocenter 8500 (via a 1611 converter, which I already have).  I had always thought the Playmaker would be of no practical use to me, and I had also thought that in order to use an Essence, I would also need an NL/ML converter, but it seems that by using Steve's cable, I wouldn't need that.

I am not an Apple user and never will be, but DNLA is an option.

Thanks Charlie for your inputs!

Indeed, the switch box can solve my problem : I can play or the Revox or the internet box.... But what if I want to record music on the Revox from the Internet box while listening to the music on the Beocenter 9300 ? Would the switch box "wisely enough wired" to manage this situation?

I heared also about another solution developped by B&O a while ago and named "AUX/TAPE adapter type 5006 (see attached)? But again, don't know if the box can manage my specific setting (record the music from the box while listenng to it) !