Hello JD, I have a 2300, I'm using Beolab 6000s. The 2300, like all systems now, needs active speakers (connected via one or both of the 8 pin DIN powerlink sockets at the rear of the unit). If you have the money then Beolab 6000s or 4000s are nice. The slightly cheaper but harder to find Beolab 2500s were designed for use with the 2500 and 2300 Beocenters). However, if money is tight then you can easily get away with just picking up a second hand B&O passive amp, there are about 4 on ebay right now. They sell for between £60 - £150 depending on age or type. The cheapest and simplest type is the MCL2P which simply has a powerlink socket input and two regular 2pin speaker outputs. So takes the output level from the Beocenter and provides conventional amplification to drive any ordinary speakers (if you want an ordinary sound that is). So you could be up and running for less than £100, especially if you already have speakers. Of course, if you have a recent B&O TV (1989 or later) then you could connect the Beocenter to the TV (via 7 pin DIN audio aux socket on the Beocenter) and use the TV speakers (need a remote for the TV too). So, you could go on ebay and buy a reasonable second hand B&O TV (MX or LX type) for anything from £10-100 (£50 should do it). Then you will have a complete B&O AV system, or at least the ability to play CD/Radio sound through the TV (and it will be good). Check out these ebay item numbers, just as an example:
380240391559
130398285588
I actually have an MCL2P amplifier that will work, even let you have the correct powerlink cable for it (has to be fully wired, mark 1 or 2 type). Then all you would need is any 8ohm passive speakers and you're in business. Let me know, 07891 854722. Was going to list it on ebay myself for £75 so if you want to make an offer then please feel free.